Left-sided events usually obscure findings in patients with rheumatic tricuspid stenosis cheap artane 2 mg with amex. Less common causes of a mid-diastolic murmur include atrial myxoma order generic artane online, complete heart block discount artane 2mg without a prescription, and acute rheumatic mitral valvulitis (Carey Coombs murmur). Continuous Murmurs The presence of a continuous murmur implies a pressure gradient between two chambers or vessels during both systole and diastole. Dynamic Auscultation Simple bedside maneuvers can help identify heart murmurs and characterize their significance (Table 10. Right-sided events, except for the pulmonic ejection sound, increase with inspiration and decrease with expiration; left-sided events behave oppositely (100% sensitivity, 88% specificity). Forward flow accelerates, causing an increase in the gradient and a louder murmur. After release of the Valsalva maneuver, right-sided murmurs tend to return to baseline intensity earlier than left-sided murmurs. Exercise: Murmurs caused by blood flow across normal or obstructed valves (as in pulmonic and mitral stenosis) become louder with both isotonic and isometric (handgrip) exercise. During the later tachycardia phase, murmurs of mitral stenosis and right-sided lesions also become louder. This intervention may help distinguish the murmur of the Austin Flint phenomenon from that of mitral stenosis. Endorsed by the Society for Cardiovascular Angiography and Interventions and the Society of Thoracic Surgeons. Common signs and symptoms include dyspnea, fatigue, exercise limitation, orthopnea, and edema. Severe and sudden-onset dyspnea indicates acute pulmonary edema, typically precipitated by ischemia, arrhythmia, sudden left-sided valvular regurgitation, and accelerated hypertension. It is important to exclude other causes, such as pulmonary embolism and pneumothorax. Self-reported functional capacity and objectively measured cardiovascular performance can differ substantially. Trepopnea, which is dyspnea or discomfort experienced in the lateral decubitus position, also may be present. Shortness of breath may be particularly noticeable when bending forward, termed bendopnea. It is associated with higher supine right atrial and pulmonary capillary wedge pressures and is mediated by further elevations in these pressures with bending over. Clinically evident edema or weight gain over days indicates volume excess but lags behind the clinical redistribution of intravascular volume from the splanchnic beds to the central veins. In patients with advanced right-sided heart failure, uncomfortable hepatomegaly and ascites may predominate. In a systematic 18 review, orthopnea only modestly predicted increased filling pressures. By contrast, if one or no findings or symptoms were present, the likelihood of increased filling pressures was less than 10%. Four signs are commonly used to predict elevated filling pressures: jugular venous distention/abdominojugular reflux sign, presence of an S and/or S ,3 4 rales, and pedal edema. In general, the use of a combination of findings, rather than reliance on isolated clinical findings, improves diagnostic accuracy. Advanced training may be required to achieve this level of diagnostic precision with the physical examination. Prognostic importance of elevated jugular venous pressure and a third heart sound in patients with heart failure. Third heart sound and elevated jugular venous pressure as markers of the subsequent development of heart failure in patients with asymptomatic left ventricular dysfunction. Marcus and colleagues conducted a rigorous assessment of S in 100 patients with various cardiovascular3 conditions undergoing elective cardiac catheterization (see online References). An S had comparable sensitivity (40% to 46%) but inferior4 specificity (72% to 80% for S versus 87% to 92% for S ) (4 3 Table 10. S frequently may be heard in3 patients referred for cardiac transplant evaluation but is a poor predictor of elevated filling pressures. Median and interquartile ranges, error bars, and outlier values (circles) are shown; P values are compared with data in the first column. Association between phonocardiographic third and fourth heart sounds and objective measures of left ventricular function. Association between phonocardiographic third and fourth heart sounds and objective measures of left ventricular function. The investigators found that an S predicted cardiovascular morbidity and mortality (3 see Fig. In the latter setting, lung ultrasound findings can identify patients with worse prognosis. When pulmonary adventitious sounds are present, specific characteristics may help elucidate a pulmonary rather than cardiac disorder (see Fig. The chest radiograph similarly lacked sensitivity for increased filling pressures in these studies. The responses can be quantified using the pulse amplitude ratio if the pulse pressure is measured during the maneuver. This ratio compares the minimum pulse pressure at the end of the strain phase against the maximum pulse pressure at the onset of the strain phase; a higher ratio is consistent with a square-wave response. A, Normal, sinusoidal response with sounds intermittent during strain and release. B, Briefly audible sounds during initial strain phase suggests only impaired systolic function in absence of fluid overload. C, Persistence of Korotkoff sounds throughout strain phase suggests elevated left ventricular filling pressures. Using a proportional pulse pressure of 25%, the cardiac index could be predicted: if the value was lower than 25%, the cardiac index was less than 2. Using oxygen as the indicator, a time from a breath-hold to the nadir of finger oximetry of greater than 34 24 seconds has been associated with a cardiac output of less than 4 L/min. A resting heart rate (in sinus rhythm) greater than 70 to 75 beats/min is an independent predictor of mortality. A good assessment for systemic perfusion and cardiac index appears to be overall clinical impression, the “cold” profile (see Fig. This prediction rule has not been reported in other patient groups, in larger cohorts, or in more contemporary studies. The history in patients with known or suspected valvular heart disease should rely on the use of a functional classification scheme and assessment of patient frailty when appropriate (see Table 10. Onset of even mild functional limitation is generally an indication for mechanical correction of the responsible valve lesion. Valvular heart disease most often is first suspected because of a heart murmur, but many patients go 27,28 undetected until presentation with symptoms. Cardiologists can detect systolic heart murmurs with fair reliability (interobserver kappa coefficient, 0.
Importantly artane 2mg with mastercard, baroreceptor function varies between individuals generic artane 2mg with mastercard, and the set point can vary in the same individual at different times or in different experimental or disease states generic 2 mg artane with mastercard. For example, the set point is often increased in chronic hypertension and decreased in chronic hypotension. Cardiopulmonary Baroreceptors The low-pressure cardiopulmonary receptors are located in the heart and the venae cavae, and are activated primarily in response to volume. The latter leads to an increase in salt and water excretion and reduces the sensed increase in volume. Chemoreflexes and the Diving Reflex Sympathetic activity can also be modulated by the chemoreflexes, which respond to hypoxemia and hypercapnia. When either or both occur, the reflex response produces hyperventilation and sympathetic vasoconstriction. The actual peripheral chemoreceptors, which respond to hypoxia, are found in the carotid bodies, and the central chemoreceptors, found in multiple areas in the brainstem, sense the pH of the interstitial fluid of the brain. For example, both hypoxemia and hypercapnia produce hyperventilation and sympathetic vasoconstriction. Inhibitory influences on the overall chemoreflex drive occur with stretch of the pulmonary afferents and with activation of the baroreflex, both of which have a greater influence on peripheral than on central chemoreflexes. In early hypertension, the ventilatory response to hypoxemia may be increased, in addition to an increase in sympathetic tone, and it has been suggested that an increased chemoreflex drive may contribute to this, as well as impaired baroreflex sensitivity. Administering 100% oxygen to patients with borderline hypertension and to spontaneously hypertensive rats reduces not only the ventilator drive but the vasoconstrictor tone, as 1 well. Forensic pathology is a branch of medicine that applies the principles and knowledge of the medical sciences to problems in the ﬁeld of law The major duties of a medicolegal system in handling deaths falling under its jurisdiction are: • To determine the cause and manner of death • To identify the deceased if unknown • To determine the time of death and injury • To collect evidence from the body that can be used to prove or disprove an individual’s guilt or innocence and to conﬁrm or deny the account of how the death occurred. Deﬁnition of Death Because of advances in medical science, what was formerly not a problem has now become one—the deﬁnition of death. In simpler times, death was deﬁned as the permanent cessation of cardiac and/or respiratory function. Today, instrumentation can keep a heart beating and an individual breathing 1 2 Forensic Pathology in spite of the fact that if this machinery were turned off, heart and respiratory activity would cease. There is extensive literature on this subject, and the deﬁnition of brain death in adults and children is not necessarily the same. The only time that difﬁculty might arise is in the harvesting of organs and the moving of brain dead individuals. Thus, in most jurisdictions, if harvest- ing of organs is intended and family permission has been obtained, and if the case is to be a medical examiner’s or coroner’s case, prior to removal of the organs, permission must also be obtained from the medical examiner or coroner. This is because, once the individual is “dead,” he or she becomes a medicolegal case. Harvesting of organs at that time could then be interpreted as interfering with the duties of the medicolegal system and therefore could constitute a crime. Permission to harvest the organs after pronouncement of death is, for the most part, automatic in most medicolegal systems, because the importance of organ harvesting is recognized by medical examiner/cor- oner ofﬁces. If properly coordinated, the harvesting of organs can be per- formed without any interference to a subsequent medicolegal examination of the body, including homicides. The only time the authors have had problems has been when it was decided to pronounce an individual dead, to maintain the person on life support systems, and to transport the body outside the jurisdiction of the medical examiner’s ofﬁce. Once the organs are harvested and the machines turned off, who then will perform the examination of the body? Because the body has been moved out of the legal jurisdiction where it was pronounced dead, does it have to be moved back to that jurisdiction or does the medi- colegal agency in the area where the organs are harvested take jurisdiction? Does this medicolegal agency have the legal right, since the individual “died” in another jurisdiction? Fortunately, such problems can usually be settled beforehand with conferences involving the agency harvesting the organs and other medicolegal entities. An individual may be pronounced dead, yet be maintained on a life support system for 2 to 3 days after pronouncement. This has sometimes resulted in confusion in the doc- umentation of the date of death. Delayed Deaths Most people realize that violent deaths (accidents, suicides, and homicides) fall under the jurisdiction of a medicolegal system. What they often fail to Medicolegal Investigative Systems 3 realize is that this jurisdiction is retained even if there is a long delay between injury and death, as long as the death was a result of injuries. Thus, if an individual suffers a head injury resulting in irreversible coma, is put in a nursing home, and dies 2 or 3 years later of pneumonia, this is still a medical examiner’s case because the medical condition was the result of trauma. In one case, an individual died of chronic renal failure within a few hours of admission to a hospital. The renal failure was due to chronic pyelonephritis, complicating paraplegia, which had in turn been caused by a gunshot wound to the spine 25 years prior. This case was not only still a medical examiner’s case, but was a homicide, since the event that started the chain of events that resulted in the death was a gunshot wound. In this case, there were no legal problems, because the perpetrator had died 10 years prior to the victim. Cause, Manner, and Mechanism of Death Two of the most important functions of the medical examiner’s or coroner’s ofﬁce are the determination of the cause and manner of death. Clinicians, lawyers, and the lay public often have difﬁculty understanding the difference between cause of death, mechanism of death, and manner of death. Simply put, the cause of death is any injury or disease that produces a physiological derangement in the body that results in the death of the individual. Thus, although differing widely, the following are causes of death: a gunshot wound to the head, a stab wound to the chest, adenocarcinoma of the lung, and coronary atherosclerosis. The mechanism of death is the physiological derangement produced by the cause of death that results in death. Examples of mechanism of death would be hemorrhage, septicemia, and cardiac arrhythmia. One must realize that a particular mechanism of death can be produced by multiple causes of death and vice versa. Thus, if an individual dies of massive hemorrhage, it can be produced by a gunshot wound, a stab wound, a malignant tumor of the lung eroding into a blood vessel and so forth. The reverse of this is that a cause of death, for example, a gunshot wound of the abdomen, can result in many possible mechanisms of death, e. Not infrequently, the cause of death is listed as “cardiac arrest” or “cardiopulmonary arrest. Experience tells us, however, that when any individual dies, the heart and lungs stop. Yet, clinicians continue to list these diagnoses on the death certiﬁcate, and some government organizations accept them as causes of death. Man- ners of death can generally be categorized as natural, homicide, suicide, 4 Forensic Pathology accident, or undetermined. An individual can die of massive hemorrhage (the mechanism of death) due to a gunshot wound to the heart (the cause of death), with the manner of death being homicide (somebody shot the individual), suicide (they shot themselves), accident (the weapon fell and discharged), or undetermined (one is not sure what occurred). The manner of death as determined by the forensic pathologist is an opinion based on the known facts concerning the circumstances leading up to and surrounding the death, in conjunction with the ﬁndings at autopsy and the laboratory tests. The autopsy ﬁndings may contradict or agree with the account of how the death occurred.
Vaginoplasty is performed through a perineal approach by creating an urethrovaginal septum safe artane 2mg. The vagina usually can be pulled into its normal position between the urethra and rectum and anastomosed to perineal skin flaps using absorbable sutures purchase artane mastercard. If performed later in life (puberty) purchase generic artane line, a vaginoplasty with complex flaps and bowel interposition is necessary. Many of these patients are on long-term corticosteroid replacement therapy, and therefore, preop stress dosing of steroids may be indicated; if a long, complicated intraabdominal procedure is anticipated, an abdominoperineal approach is required. A loop of sigmoid colon or ileum is isolated, along with its mesentery and is brought through the perineal incision. Also, these procedures may be used for gender reassignment if masculinization of the ambiguous genitalia in a genotypic male is not possible. Rink R, Kaefer M: Surgical management of intersexuality, cloacal malformations, and other genitalia in girls. The prune belly (Eagle-Barrett) syndrome includes dystrophic abdominal musculature, requiring an evaluation of pulmonary function. Congenital cardiac anomalies may be present, and an evaluation should be performed prior to surgery. Pediatric urology patients with lower urinary tract dysfunction and underlying neurologic disorders (e. Testicular torsion is one of the few true pediatric urologic emergencies because testicular infarction will occur within hours of the torsion. Testicular tumors in children, accounting for 1–2% of all pediatric solid tumors, are more frequently benign than those in adults and represent the main indication for radical or simple orchiectomy. Orchiopexy: Orchiopexy for a palpable undescended testis is performed through a small inguinal incision. A nonpalpable testis may warrant diagnostic laparoscopy as the initial procedure; otherwise, the external oblique fascia is opened, exposing the inguinal canal. The testis is localized, and the cord is dissected to gain adequate length for scrotal fixation, without torsion or tension, to prevent postop ischemia and atrophy. If the testicle is high and adequate inguinal mobilization is not possible, dissection into the retroperitoneum may be required. The scrotal pouch is created by skin incision two-thirds the way down to the scrotum and blunt dissection between the skin and dartos muscle. Both ilioinguinal nerve block and caudal analgesia appear to be equally effective in management of postorchiopexy pain, but parents should be counseled on the risk of postoperative urinary retention with caudals. When inguinal block is contemplated prior to incision, this should be discussed with the surgeon. At times, inguinal infiltration distorts the anatomy and may perforate the hernia sac, thus turning a relatively simple operation into a more complex one. Alternatively, the block may be performed at the end of the procedure or the wound irrigated with 0. There is no definitive diagnostic imaging study, although Doppler and isotope scans of the testis can be useful. At times, symptoms of testicular torsion may be indistinguishable from epididymitis or torsion of the testicular appendages (embryonic remnants). The testis is delivered through a scrotal incision, examined, detorsed, and assessed for viability. If the testicle is viable, it is fixed in a scrotal dartos pouch, or some may perform 3-point suture fixation. A torsion of a testicular appendage usually is treated medically with pain control and anti- inflammatory agents. If this condition is discovered at surgical exploration, the diseased tissue is excised, the testis is simply reinserted in the scrotum, and the wound is closed. It should be noted that neonatal (antenatal) or perinatal torsion may be performed in the newborn period. If the diagnosis is unclear, and/or there is an associated hydrocele or hernia, this operation may be performed through an inguinal incision. Usual preop diagnosis: Testicular torsion; torsion of the testicular appendage Hydrocelectomy–inguinal hernia repair: This procedure is performed through an inguinal incision and dissection of the inguinal canal. The patent processus vaginalis is carefully dissected from the cord structures; the peritoneal sac is ligated at the level of the internal inguinal ring; and the wound is closed after evacuation of the hydrocele liquid. The external oblique fascia is opened, and the spermatic cord is isolated and clamped at the level of the internal ring. If the testis is felt to contain malignancy, the cord is ligated and divided at the level of the internal inguinal ring. A combined technique with caudal anesthesia often is used for nonendoscopic procedures. Jagannathan N, Sohn L, Sawardekar A, et al: Unilateral groin surgery in children: with the addition of an ultrasound-guided ilioinguinal nerve block enhance the duration of analgesia of a single-shot caudal block? Manickam A, Vakamudi M, Parameswari A, Chetan C: Source Department of Anesthesiology Critical Care and Pain Medicine, Sri Ramachandra University, Porur, Chennai, Tamil, Nadu, India. Efficacy of clonidine as an adjunct to ropiuacaine for caudal analgesia in children undergoing subumbilical surgery. Rubin K, Sullivan D, Sadhadivan S: Are peripheral and neuraxial blocks with ultrasound guidance more effective and safe in children? It is used widely to locate the impalpable testis (diagnostic laparoscopy), with subsequent laparoscopic orchidopexy as needed and has gained popularity for other procedures such as nephrectomy, partial nephrectomy, nephroureterectomy, adrenalectomy, pyeloplasty, and varicocelectomy. Other trocars (2, 5, or 10 mm) are then inserted, as necessary, under direct laparoscopic vision, avoiding abdominal wall vessels and internal organs. Impalpable testis: If diagnostic laparoscopy reveals blind ending vessels, confirming the absence of a testis, the procedure is terminated and no inguinal incision is made. An inguinal testis remnant usually indicates either antenatal testicular ischemia or torsion. If the vessels are seen to enter the inguinal ring, the laparoscopy is ended and inguinal exploration is performed. If the testis is located intraabdominally, it is evaluated for size and location to determine whether to proceed to orchiectomy or a one- to two-stage (Fowler Stevens) orchiopexy. Laparoscopic ligation of the gonadal vessels may be done with placement of the testis into a scrotal pouch (dartos pouch) in one stage, if adequate cord length permits. In other situations, laparoscopic or open dissection of testicular vessels on a peritoneal pedicle in the retroperitoneum may be performed. A 2nd-stage Fowler Stevens is performed after ligation of the gonadal vessels to allow adequate collateral vascular development before the intraabdominal testis is brought into the scrotum. Laparoscopic orchiectomy or gonadectomy also may be performed in intersex situations for a dysgenetic (streak), nonviable gonad or for a gonad in which inadequate cord length exists. Usual preop diagnosis: Nonpalpable testis; cryptorchidism Varicocele ligation: Through a transperitoneal approach identical to that of the approach for diagnostic laparoscopy, the spermatic veins are isolated from the abdominal wall and are ligated with metallic clips to reduce the varicocele. The primary complications from this procedure are hydrocele and varicocele recurrence. Usual preop diagnosis: Varicocele Heminephrectomy, nephroureterectomy, and pyeloplasty: With the patient in the lateral-decubitus position, the initial trocar is inserted extraperitoneally on the anterior axillary line just below the 12th rib. Gas dissection is used to open the retroperitoneal space, and kidney dissection is performed.
The Hassab procedure involves devascularization of the upper half of the stomach and splenectomy buy 2 mg artane free shipping, thus effectively disconnecting the esophageal varices discount artane amex. This is accomplished by placing a row of staples at the esophagus just above the esophagogastric junction buy discount artane on-line. Because portal perfusion of the liver is maintained after the nonshunt procedures, hepatic function is preserved. Preservation of intravascular volume and myocardial stability can be a challenge in these patients. Liu Y, Li Y, Ma J, et al: Modified Hassab’s operation for portal hypertension: experience with 562 cases. Voros D, Polydorou A, Polymeneas G, et al: Long-term results with the modified Sugiura procedure or the management of variceal bleeding: standing the test of time in the treatment of bleeding esophageal varices. Vascular access using vascular substitutes or prosthetic grafts is performed when there is a lack of suitable veins in patients who have had failed-access procedures, peripheral vein sclerosis, or severe arterial disease involving the upper extremity. Forearm grafts are constructed as a direct communication between the radial or ulnar artery and the antecubital or brachial vein, or as a “loop” between the brachial artery and these veins (Fig. Similarly, an access can be constructed in the upper arm as a communication between the brachial artery above the elbow and the basilic or axillary vein in a straight fashion. The polytetrafluoroethylene (Teflon) graft has become the mainstay for hemodialysis access in patients who are not candidates for Brescia-Cimino fistula placement. In arteriovenous hemodialysis access with prosthetic graft, the brachial artery and the median antebrachial, median basilic, and median cephalic veins are exposed via a horizontal incision below the antecubital joint crease. Hickman, Broviac, and Groshong catheters are made of silicone rubber or plastic with a cuff near the skin exit site, which (in theory) serves as a barrier to infection. These catheters are available in various sizes and in single- or double-lumen configurations. Mediport and Portacath devices have a metallic or plastic reservoir connected to the catheters and are intended for complete subcutaneous implantation. These catheters are used in chronically ill patients, particularly those requiring chemotherapy. The implantable access ports have been associated with improved patient comfort and reduced infection rates. Removal and replacement of the catheter is the only way to eradicate the infection. Variant procedure or approaches: Two major distinctions: Hickman/Broviac catheters (no reservoir) vs Mediport/Portacath catheters (subcutaneous with reservoir). Also presenting for these procedures are end-stage renal failure patients who need arteriovenous access for hemodialysis (generally involving the upper extremity). Anesthetic considerations for the chronic renal failure patient are discussed below. See section on upper extremity blocks (Anesthetic Considerations for Wrist Procedures, p. If the patient was very recently dialyzed, there may be a residual heparin effect. General anesthesia: The duration of action and elimination of many anesthetic drugs is altered in the patient with renal failure. Clinical manifestations include pathologic changes in the skin and subcutaneous tissues, such as pigmentation, dermatitis, induration, and ulceration around the lower portion of the leg. The condition is most commonly caused by defective venous valves and less often by obstruction to the venous return or impaired pumping action of the muscles in the leg. Varicose veins of the primary type, particularly those of long duration, are a common cause of chronic venous insufficiency of milder degrees. Most symptoms respond well to conservative management, which includes compression stockings, elevation of the extremity, and topical treatment of ulcerations. Split-thickness skin grafting is indicated for large ulcers to accelerate healing and shorten hospitalization time. If the quality of the skin overlying the perforators prevents a direct approach, subfascial ligation of the perforators may be performed through a short, posterior midline incision. The incompetent greater or lesser saphenous veins are resected only if patency of the deep system is confirmed. Venous ulcers recur in 30% of patients after surgical therapy, and ulcerations persist for prolonged period in 15% of patients. Adjunctive procedures include valvuloplasty, vein transposition, and venous valve transplant. Alternative procedures: Minimally invasive radiofrequency techniques have been used successfully for ablation of varicose veins. Usual indications for operative therapy include aching, swelling, heaviness, cramps, itching, cosmesis, stasis dermatitis, pigmentation, burning, and ulcers. Surgical treatment is contraindicated in: pregnant patients; elderly patients who are considered high risk; and patients with arterial insufficiency of the lower extremities, lymphedema, skin infection, or coagulopathy. There are two principal approaches: the stab avulsion technique and high ligation and stripping. Small transverse or longitudinal incisions are made directly over these varicosities, which are dissected from the surrounding subcutaneous tissue (with undermining of the skin) and bluntly removed or avulsed. After removal of all marked varicosities, sterile dressings are placed and a compression bandage wrapped around the affected leg. The patient is instructed to keep the leg elevated as much as possible while convalescing at home. The chief advantage of the stab avulsion technique is preservation of the saphenous vein when it is not directly involved with varicosities. If there is valvular incompetence of the saphenous vein, the treatment of choice is stripping (avulsion) of the incompetent portion of the greater and lesser saphenous veins, together with avulsion of the superficial varicose veins of the thigh and calf. High ligation and stripping refers to the removal of the greater saphenous vein from the level of medial malleolus to the saphenofemoral junction. A small transverse incision is made at the level of the ankle and the saphenous vein is dissected free. A longitudinal or oblique incision at the groin permits isolation of the saphenous vein at the saphenofemoral junction. After a venotomy, a plastic or metallic vein stripper is passed and the vein is removed or stripped in a distal-to-proximal fashion. Although high ligation and stripping is the gold standard in the treatment of varicose veins, it has largely been replaced by thermal ablation in the United States. However, surgical ligation and stripping still has a role in the management of varicose veins. If all varicose veins are removed and the incompetent segment of the saphenous vein is stripped, 85% of the patients will have good-to-excellent results at late follow-up.
This nomenclature has undergone signiﬁcant revi- allel outlets to the common trunk generic artane 2 mg amex. The repair options involve origins order 2 mg artane visa, interrupted aortic arch discount artane 2mg online, and relative sizes of the aor- resecting a portion of the septum and redirecting ﬂow from tic and pulmonary trunks, leading to a more generalized cat- the left ventricle to the common arterial trunk with a patch. This recent classiﬁcation views truncus arterio- is generally larger and more difﬁcult to close owing to the sus as a common arterial trunk associated with either pre- tricuspid attachments and proximity to the conduction sys- dominantly pulmonary artery characteristics (Fig. The distal pulmo- venting, and pulmonary artery trunk constriction to prevent nary anastomosis is generally accomplished with running pulmonary overcirculation and systemic hypoperfusion. Rarely, a aortic clamp is applied and antegrade cardioplegia is admin- left or right pulmonary artery incision is made to accom- istered. The proximal conduit-to-ven- alternative administration techniques must be initiated, tricle anastomosis is performed directly to the superior such as direct coronary infusion or retrograde cardioplegia. Not shown in this drawing is the impor- graft is used, because the conduit can be cut on a bevel and tant maneuver of separating the pulmonary trunk from the will achieve the same orientation as the homograft-hood common trunk. During separation of the pulmonary trunk from the used, the ventricular anastomosis usually does not require common trunk, careful attention must be paid to the origin Dacron felt strips for reinforced suturing, but the porcine of all coronary arteries to prevent unwanted injury. For this Dacron valved conduit is stiff, and suturing to the friable reason, it is best to repair the moiety of the common trunk ventricular edge often requires Dacron felt to reinforce the with a biologic or prosthetic patch, which will maintain the anastomosis, especially in young infants undergoing their neoaortic conﬁguration and guard against coronary artery ﬁrst surgery. The completed truncus repair using the hood obstruction from suture line distortion. This maneuver is mildly controversial because the patent fora- men ovale was not closed, and it is likely that the heart will recover to sinus rhythm before the ventriculotomy is closed. We manage this problem of possible air in the ventricle by leaving the left ventricular vent on suction and discontinu- ing the assisted suction venous drainage in the right atrium, allowing a reservoir of right atrial volume and decreasing the possibility of air shifts to the left atrial and left ventricular cavities. Establishing right ventricular to pulmonary artery conti- nuity is achieved by a valved conduit. Various methods can be used for this portion of the operation: • Pulmonary or aortic homografts. In other words, the continuum between these two subtypes was characterized as somewhere in the middle of the anatomic descriptions, resulting in an informal type called Type 1½. This kind of anatomic contin- uum is not uncommon in congenital heart disease, but it raises important surgical considerations that are noted in the next series of drawings. The most important issue is not so much the type as the con- duct of the operation that will lead to more accurate pul- monary trunk excision, coronary artery preservation, and proximal arterial trunk reconstruction. Note that the left main coronary artery is very close to the oriﬁce of the pulmonary artery trunk. Also note that removal of the pulmonary artery trunk without truncal transection can be Fig. The pulmonary artery homograft is being sutured end-to-end into the con- ﬂuence of the pulmonary arteries, the aorta is being recon- structed using an end-to-end technique to ensure accurate suturing, and a right ventriculotomy is being performed. The cross-clamp can now be removed and the pulmonary conduit can be sutured to the ventricular edges (Fig. Most cardiopulmonary bypass schemes in patients with interrupted aortic arch are managed by dual arterial cannulation, with one catheter in the proximal aorta and one catheter in the ductus arteriosus to perfuse the lower extremity during the cooling phase of bypass. Patients with truncus arteriosus and interrupted aortic arch do not require this type of cannulation technique, however, because the proximal connection of the aortic and pulmonary artery trunks is part of the pathology, thereby allowing catheter ﬂow to the ascending aorta and the descending aorta through Fig. Once the perfusion strategy is chosen, cardiopulmonary bypass is commenced with snug- ging of the pulmonary trunk (right and left pulmonary arter- ies) to prevent pulmonary overcirculation and systemic hypoperfusion. The patient is then cooled to 18 °C and either circulatory arrest or regional perfusion is enacted. The pulmonary artery snugger is removed, the ductus arteriosus is ligated and divided, the pulmonary trunk is removed from the common Fig. An incision is made in the transverse arch and extended to the left common carotid if necessary. The descending aorta is then mobilized and brought into apposition with the trans- verse arch, and a wide anastomosis is accomplished (Fig. Occasionally, an anterior patch to augment the aortic reconstruction will be necessary to avoid undue ten- sion and ensure a large reconstruction free of any potential stenosis (not shown ). Once the aortic reconstruction is accomplished, the ascending aorta is transected, in order to perform the maneuver of Lecompte and reposition the entire pulmonary artery anterior to the aortic arch. The aorta is then reanasto- mosed and cardiopulmonary bypass is reinstituted, all the time keeping the clamp on the ascending aorta and replen- Fig. At this point in the operation, the aortic oversizing of the pulmonary conduit, or an extended cross- cross-clamp can be removed and preparations for right ven- clamp time. The edges of the remaining leaﬂet are then sutured together to form the new commissure (not shown ). The ﬁrst is the place- cally addressed, especially if the regurgitation is moderate- ment of pledget-supported sutures to perform the annular severe or severe. After this, the edges procedure at the initial reparative operation or at subsequent of the remaining aortic wall are reapproximated with running operations in association with conduit replacement. There is suture technique, recognizing that this suture line will form a measurable incidence of quadricuspid truncal valves, the basis of the new commissure. Such valves can be repaired reconstructed truncal reduction annuloplasty and the newly using a leaﬂet and cusp resection, reduction annuloplasty, created commissure, as seen from the exterior. Proper evaluation of the forms the quadricuspid valve into a bicuspid valve truncal valve, the leaﬂet orientation, and the coronary arter- (Fig. Often, it is the smallest leaﬂet as the leaﬂets in a neonate are ﬂimsy and do not always hold of the quadricuspid truncal valve that is prolapsed and is the sutures well. In the same drawing, the prolapsed leaﬂet is sharply being removed in preparation for the reduction annuloplasty Rarely, a coronary artery originates from a diminutive coro- and commissural reconstruction. This reduction annuloplasty and recreation of the commissure, problem can be managed by coronary artery button removal with the coronary button already anastomosed to the adja- and mobilization from the affected sinus of Valsalva, leaf- cent sinus of Valsalva. The coronary artery button must be let resection, reduction annuloplasty, and reimplantation carefully and extensively mobilized onto the ventricular of the coronary button into an adjacent sinus of Valsalva surface in order to avoid kinking and obstruction to ﬂow. In addition, the left coronary artery oriﬁce can be more readily visualized Standard transmediastinal cardiopulmonary bypass is insti- and preserved. An aortic cross-clamp is placed and ante- the patch can be placed without incorporating the free walls grade cardioplegia is administered (Fig. Recognize that double arterial the ascending aorta (dotted line) for the proposed neoaortic cannulation (ascending aorta and pulmonary artery) is not reconstruction. Uniform perfusion and tion is augmented with a pulmonary or aortic homograft, and cooling is assured using this technique. The patient can then be placed on route to deep hypothermia and circulatory arrest to repair the cardiopulmonary bypass or revert to total body circulation if interrupted aortic arch. Alternatively, aortic cannulation via regional perfusion has been elected for arch reconstruction. Aortopulmonary agement of aortopulmonary window: a 40-year experi- window and aortic origin of a pulmonary artery. Pediatric cardiac surgery, (Reproduced with permission from Oxford University 4th ed. The ventricular incision therefore and revisions over the years, leading to the current use of a need not be any larger than necessary to establish an ade- transatrial, transpulmonary artery approach for most cases.
Attention is then paid to the vagina purchase artane 2 mg free shipping, where the remaining portion of the procedure is performed through the vaginal approach buy artane without prescription. Once the vaginal cuff is closed discount 2 mg artane visa, and pneumoperitoneum achieved, the surgeon can look into the abdomen through the laparoscope to ensure hemostasis at the end of the case. The procedure for laparoscopic or robotic supracervical hysterectomies is similar, the primary difference is that the uterus is removed through the abdominal incisions with the help of an uterine morcellator. General anesthesia: Regional anesthesia: A T4-6 sensory level is sufficient to provide anesthesia for procedures on the uterus. Cystoceles are often symptomatic due to bladder protrusion past the introitus during straining. Often this relaxation will allow the bladder neck to lose its important anatomical relationship to the urethra and the rest of the bladder. The result can be bothersome stress urinary incontinence and/or incomplete emptying for the patient (see Operations for Stress Urinary Incontinence, p. The rectocele often is experienced as a vaginal bulge during straining and tends to cause incomplete evacuation of stool. Due to the frequent coexisting relaxations, a posterior colporrhaphy (vaginal repair), enterocele repair, and vaginal hysterectomy are frequently performed at the same time. A vaginal hysterectomy is performed at this point, if indicated (see Vaginal Hysterectomy, p. The extent of the urethrocystocele is determined manually, and the vaginal mucosa is grasped at its cephalic border with two clamps. This decreases blood loss significantly and helps to determine the depth of the vaginal mucosa. The mucosa is cut over this undermined area and, with the help of sharp and blunt dissection, the mucosa is dissected laterally from its underlying fascia. Paravaginal repair is another procedure for repair of cystocele and can be performed via the abdomen or the vagina. The space between the bladder and pubic bone is entered, and the bladder is dissected off the pelvic sidewall, taking care to avoid injury to the obturator nerve and vessels. The arcus tendineus fascia pelvis is visualized, running from the inferior margin of the pubic symphysis posteriorly to the ischial spine. The surgeon places a hand in the vagina to elevate the lateral vaginal sulcus to the arcus tendineus fascia. Multiple fine sutures are placed to secure the paravaginal tissues to the arcus tendineus fascia pelvis. The same is done for the opposite pelvic sidewall if bilateral defects are present. The vaginal mucosa over the rectocele is undermined with vasoconstrictor fluid prior to incision, followed by dissection of the overlying mucosa in a manner nearly identical to anterior colporrhaphy. One or several layers of stitches are placed to plicate the pararectal fascia, allowing for reduction of the rectocele. An enterocele often is first noticed during a posterior colporrhaphy procedure and is repaired during the posterior repair. To reduce the enterocele in an optimal fashion, intraabdominal pressure has to be at a minimum. Abdominal approach: An abdominal sacrocolpopexy or sacrocervicopexy can be performed for vaginal vault or cervical stump prolapse. This procedure can be performed through a Pfannenstiel or midline incision or via the laparoscopic/robotic approach. After entering the abdomen a self-retaining retractor is used to retract the bowels. The peritoneum over the sacral promontory is carefully incised longitudinally, and the sacral promontory is exposed. The peritoneum is opened along the right pararectal space down to the right uterosacral ligament and to the vaginal cuff or cervical stump (cervicopexy). One end of the mesh is attached to the vaginal cuff (cervix), and the opposite end attached to the sacral promontory, thereby elevating the vaginal apex. During laparoscopy or a robotic-assisted abdominal sacrocolpopexy or cervicopexy the patient is placed in steep Trendelenburg to aid in bowel retraction. Cystourethroscopy is performed after the procedure to ensure ureteral and bladder integrity. A midurethral urinary incontinence sling is often performed after completion of the sacrocolpopexy to prevent stress urinary incontinence. Variant procedure or approaches: Vaginal sacrospinous ligament suspension is an alternative to sacrocolpopexy. The patient is placed in a dorsal lithotomy position, and an examination under anesthesia is performed. A vasoconstrictive solution is injected (usually epinephrine 3–5 mL, 1:200,000) in the posterior vaginal wall. A vertical incision is made, and the mucosa is bluntly dissected off the rectum in an anterolateral direction. The anatomy surrounding the sacrospinous ligament is well palpated and, with the help of the special Miya hook, a large suture is placed into the sacrospinous ligament. The other end of the suture is placed at the apex of the vagina, which, after tying, is pulled in a lateral cephalad direction. Uterosacral ligament suspension, or high McCall’s culdoplasty, is an alternate procedure for vaginal apex support. After the uterus is removed by a vaginal hysterectomy, the uterosacral ligaments are identified. Two separate permanent sutures are placed along the uterosacral ligament as far cephalad (toward the sacrum) as possible. An additional stitch of absorbable suture is placed at the vaginal corners bilaterally and carried through the uterosacral ligaments as well. A cystoscopy is then carried out with all four stitches placed on tension to r/o ureteral obstruction due to ligation or kinking of the ureters. After ureteral patency has been confirmed, these stitches are sutured to the fibromuscular layer of the vaginal cuff and tied to bring the apex as cephalad as possible. T h e Le Fort procedure, colpectomy and colpocleisis, are highly efficacious, minimally invasive operations performed in women with complete prolapse of the uterus and/or vagina, respectively, who do not desire to remain sexually active. With the patient in a dorsal lithotomy position, the anterior and posterior vaginal mucosa are dissected from the underlying fascia, and then the anterior and posterior vaginal fascia are plicated together, resulting in near-complete closure of the vagina. Advantages of these techniques are that they can be performed rapidly, they do not require general anesthesia, and most patients can be discharged from the hospital the following day. Closure procedures are ideal for patients who are elderly and/or have multiple medical conditions that make more invasive surgery risky. Use of vaginal mesh kits: Vaginal mesh kits are currently available for the treatment of pelvic organ prolapse. Some systems treat anterior vaginal wall and apical prolapse, whereas others (used less commonly) treat posterior vaginal wall prolapse. Similar to a cystocele repair (for an anterior mesh kit), the vaginal mucosa is hydrodissected with a vasoconstrictive solution.
The International Society of Heart and Lung Transplantation guidelines for the care of heart transplant recipients discount artane 2 mg on line. Safety of stress echocardiography (from the International Stress Echo Complication Registry) cheap artane amex. A report from the American Society of Echocardiography developed in collaboration with the Society for Cardiovascular Magnetic Resonance order artane 2 mg free shipping. Recommendations for the echocardiographic assessment of native valvular regurgitation: an executive summary from the European Association of Cardiovascular Imaging. Recommendations for evaluation of prosthetic valves with echocardiography and Doppler ultrasound. Developed in conjunction with the American College of Cardiology Cardiovascular Imaging Committee, Cardiac Imaging Committee of the American Heart Association, the European Association of Echocardiography (a registered branch of the European Society of Cardiology), the Japanese Society of Echocardiography, and the Canadian Society of Echocardiography. Valve prosthesis:patient mismatch, 1978 to 2011: from original concept to compelling evidence. Document covering acute and chronic aortic diseases of the thoracic and abdominal aorta of the adult. Role of transthoracic and transesophageal echocardiography in right-sided endocarditis: one echocardiographic modality does not fit all. Guidelines for the use of echocardiography in the evaluation of a cardiac source of embolism. Expert consensus for multimodality imaging evaluation of adult patients during and after cancer therapy: a report from the American Society of Echocardiography and the European Association of Cardiovascular Imaging. Guidelines for the echocardiographic assessment of the right heart in adults: a report from the American Society of Echocardiography. Endorsed by the European Association of Echocardiography (a registered branch of the European Society of Cardiology) and the Canadian Society of Echocardiography. Pericardial masses, cysts and diverticula: a comprehensive review using multimodality imaging. Three-dimensional transesophageal echocardiography of atrial septal defect: a qualitative and quantitative anatomic study. Multimodality imaging guidelines of patients with transposition of the great arteries: a report from the American Society of Echocardiography developed in collaboration with the Society for Cardiovascular Magnetic Resonance and the Society of Cardiovascular Computed Tomography. Multimodality imaging guidelines for patients with repaired tetralogy of Fallot: a report from the American Society of Echocardiography developed in collaboration with the Society for Cardiovascular Magnetic Resonance and the Society for Pediatric Radiology. Focused cardiac ultrasound: recommendations from the American Society of Echocardiography. This difference is caused by the divergence of the x-ray beam from the source, which magnifies structures located farther from the image detector. A useful analogy is to contrast the size of the shadow of your hand when you lift your hand away from the sidewalk. In this example the sun is the x-ray point source, and the sidewalk is the detector (eFig. On a lateral view the right hemithorax is magnified relative to the left hemithorax. This feature may be helpful in determining if a small pleural 3 effusion is right or left sided when visible only on the lateral view (eFig. Portable radiograph shows an apparent large right atrial contour and a mediastinal widening to the right of the spine. Portable x-ray machines have lower tube output power, with resultant longer exposure times and increased cardiac and respiratory 4 motion artifacts, as well as decreased resolution. The positions of other tubes and catheters are also depicted, such as the pulmonary arterial catheter with its tip in the right pulmonary artery. The left ventricle apex is obscured by a small, left pleural effusion (white arrow). To calculate this ratio, the horizontal thoracic diameter is measured along the inner margins of the ribs at the level of the dome of the right hemidiaphragm, and the cardiac diameter is calculated as the sum of the most rightward and the most leftward diameters of the heart from the midline. Normally the heart projects over the spine, with about one quarter of its diameter projecting to the right of the midline and three quarters to the left of the midline. The cardiac apex is normally directed to the left, located adjacent 6 to the diaphragm (see eFig. Because the cardiac silhouette represents a summation of the heart and surrounding structures, the heart size can erroneously appear enlarged when abundant mediastinal fat and prominent pericardial fat pad or 7 a large pericardial effusion are present. A truly decreased heart size occurs when the patient is hypovolemic, as in Addison disease or chronic malnourishment (eFig. Skeletal abnormalities such as pectus excavatum and scoliosis of the thoracic spine can alter the rotation of the heart and make it appear enlarged on a frontal radiograph. A, Patient with Noonan syndrome and spontaneously healed ventriculoseptal defect presents with scoliosis and severe pectus excavatum deformity. The very short distance between the sternum and the spine causes a leftward rotation and displacement of the heart into the left hemithorax defect (A, B). C, Patient with tetralogy of Fallot who had a Blalock-Taussig shunt in childhood presents with unilateral inferior rib notching (arrowheads). The left fourth and fifth ribs are fused due to lateral thoracotomy in early childhood. Surgical clips above the expected location of the main pulmonary artery (white arrow) is related to previous Blalock- Taussig shunt, which before definitive repair provided blood flow from the left subclavian artery to the left pulmonary artery (C, D). The left lateral wall of the descending aorta creates a vertical line projecting lateral to the spine superiorly and over the spine inferiorly as the aorta descends to the diaphragm. The right wall of the aorta is not visible because there is no interface between it and the right lung. Care should be taken not to confuse the azygoesophageal recess for the right aortic border (Fig. On the lateral view the normal right ventricle should be flush with about one third of the lower sternum. The posterior cardiac border consists of the left atrium superiorly and the left ventricle inferiorly. The right and left inferior pulmonary veins 9 appear as branching, elongated densities posterior to the heart and inferior to the hila (Fig. The aorta normally increases in size with age, and the great arterial branches off the aortic arch become more tortuous, creating a widened superior mediastinum. The right and left lungs should be symmetric 10 in size and pulmonary vascular markings. Approach to Evaluation of a Chest Radiograph A well-developed approach to the chest radiograph takes years to develop and is beyond the scope of this chapter. Each interpreter must develop a consistent approach that carefully looks at the bones, lungs (with 11 attention for pleural abnormalities), vasculature, and heart. Prior radiographs should be reviewed routinely because many abnormalities are put into appropriate perspective by determining whether they are new or old and the rate of change. For example, new enlargement of the aortic arch may be seen in the setting of aortic dissection, whereas chronic mediastinal widening is more likely to be related to a congenital variant such as a double aortic arch. The final step in image interpretation relies on the generation of a differential diagnosis based on the constellation of 12 findings and an appropriate clinical history. Diseases Affecting Heart Size and Morphology When the cardiac silhouette is enlarged, it is most often related to biventricular failure, with no definable individual chamber enlargement.