Note that the longest pin does not penetrate the cortex of the bone purchase fluoxetine 10 mg with visa, and that the shortest pin is placed into the cortex discount 10 mg fluoxetine otc. The bird will have less of a problem with fixation- This pin is inserted at a 45° angle to the long axis of induced fracture disease 20 mg fluoxetine mastercard. A As with any pin that is placed through the cortex, the rubber band is placed around the hooks to compress stabilizing pins used in this technique should be the fracture. Postoperatively, several opened gauze inserted through pre-drilled, appropriately sized pads are placed between the skin and the rubber holes (smaller than the pin size). The affected appendage is as far away from the fracture as possible without placed in an appropriate bandage (leg: Robert Jones; compromising the periarticular tissues. The rubber bands has entered the cortex, the angle is changed so that can generally be removed within 10 to 21 days, and the pin bounces off the opposite cortex and can be the pins between 21 and 40 days after surgery. Either cerclage wires or pin as it exits the skin so that the pin is relatively fracture transversing staples can be used to mini- perpendicular to the bone. A semicircle (hook) is fash- mize over-riding or rotation in oblique and commi- ioned in the end of the pin about 1 cm from the skin. For additional stability, a section of the bone end can be removed (arrow) and placed in a slot created in the end of both fracture segments. The defect in the beak was covered with calcium hydroxide and a hydroactive dressing before being sealed with cyanoacrylate. This rotation can be reduced sion or bruising of the propatagium should always be by notching the ends of the bone fragments with a avoided. The Wing The Doyle technique can be used in combination with The Carpometacarpus cleaning, calcium hydroxide and acrylics to repair the Figure 42. If the the fracture segments and connected with rubber single artery and vein located between the third and bands. The fracture site and beak defect are covered fourth metacarpal bones are damaged, avascular ne- with calcium hydroxide paste to prevent dental acrylic 41 crosis to the distal portion of the wing can occur. The most direct approach to fractures of the carpometa- fracture is then covered with dental acrylic or a hy- carpus is the dorsal approach. The defect and fracture will gener- alized immediately beneath a dorsal skin incision. Minimally displaced closed fractures of the carpometacarpus may be repaired with a figure-of-eight bandage (see Surgical Approaches Chapter 16). The clinical drawback to bandages is the loss in range of motion of the carpal joint while the fracture is healing. During a surgical procedure, every attempt should be Fractures of the carpometacarpus are ideally suited made to identify and follow the natural separations for small, lightweight external fixators that allow between muscles and along fascial planes. These are instances, surgical approaches can be planned to usually applied using small K wires or hypodermic avoid muscles completely, which will reduce the de- needles and then attached by a connecting bar com- gree of surgically induced soft tissue damage. The dorsal connecting bar has been elevated away from the skin margin for clarity purposes. However, given the resulting de- ture site and normograded distally and then retro- crease in range of motion of the elbow and carpal graded back to the proximal fragment. Plates may also be used on frac- In larger birds, small plates may also be used; how- tures that are closed. An incision is made on the dorsocranial aspect The Radius and Ulna of the ulna just cranial to the insertion point of the Occasionally, birds are presented with fractures of secondary feathers (Figure 42. Given the larger size of the ulna, which both bones are broken, repair of the ulna alone radial fractures are often anatomically stabilized and is sufficient. Bandages or simple en- tures, the surgeon may need to stabilize the radius to closure rest may result in adequate fixation of mini- allow proper healing. The intraosseous space graded out toward the carpus (avoiding the joint) and between the radius and ulna houses the radial nerve then retrograded back through the proximal frag- and the radial artery, both of which should be ment may be useful in reducing the fracture. Badly displaced radial and ulnar fractures can usu- ally be repaired by applying an external fixator or shuttle pin in the ulna, and placing a simple intra- medullary shuttle pin in the radius. The Humerus Humeral fractures usually require open fixation be- cause contraction of the pectoralis and biceps brachii muscles pulls the distal bone fragment proximally, creating a displaced fracture (Figure 42. This procedure avoids tran- section of the basilic vein and artery over the ventral aspect of the bone, as well as the medianoulnar nerve. However, the surgeon must cautiously incise dorsally over the midsection of the humerus to avoid the radial nerve. The resulting displacement of the bone necessitates open immediately beneath the skin. For a ventral approach, the surgeon makes The Coracoid an incision over the cranioventral aspect of the Birds can fracture the coracoid by flying into large, humerus, taking care to avoid the medianoulnar solid objects such as walls, windows or cars. The mally displaced fractures may be stabilized success- easily separable muscles of the biceps and the triceps fully by bandaging the wing to the body. The choice of fixation technique is edge of the furcula starting laterally and then con- based on the nature of the fracture, the type of pa- tinuing medially along the lateral edge of the keel for tient and the surgeon’s experience. External fixators the first one-fifth or one-sixth of the length of the keel in combination with shuttle pins or intramedullary bone (Figure 42. Radiosurgery is necessary to control hemor- fixator will reduce the chances of fixation-induced rhage from the clavicular artery, which supplies part injuries to the animal. This vessel is usually encoun- dages must immobilize the shoulder joint as well as tered at the caudal midpoint of the furcula. An inci- the elbow and, therefore, must be wrapped around sion or blunt dissection is used to penetrate the deep the body of the bird. Trauma associated with a fractured coracoid can be significant, resulting in massive soft tissue damage and hematoma formation. Because of the location of the coracoid, the surgeon works in a small, deep hole, and ra- diosurgery as well as irrigation are mandatory to keep the surgical field clean. The proximal fragment of the cora- coid should be grasped and rotated into the incision. Following cleaning and debridement, multiple small in- tramedullary pins are introduced at the fracture site and exteriorized through the point of the shoulder. The distal fragment is rotated up into view and cleaned, and the frac- ture is aligned. If the pins are advanced too far caudally and penetrate the sternum, the pins may perforate the pericardium and the heart. This problem can be pre- vented by carefully measuring the length of the distal fragment and us- ing this distance to advance the pins. Muscle bellies are re-apposed using a simple continuous pattern and ab- sorbable suture material. The Leg Fractures of the tibiotarsus, tar- sometatarsus and phalanges are best repaired using external fixation techniques (Figures 42. The 2) humerus is visible is simple because of the lack of soft immediately beneath the incision.
Tendonectomy Pinioning results in an aesthetically altered bird buy fluoxetine 10mg with amex, particularly if the wings are extended during preen- ing or courtship behavior cheap fluoxetine 10mg on-line. Some bird keepers believe that a pinioned male will have difficulties in main- taining the necessary balance to properly mount and mate with a hen discount fluoxetine 10mg free shipping. Suggested alternatives to pinioning include removal of the extensor carpi radialis tendon (tendonectomy) or a wedge resection of the propatagium (patagiectomy). In addi- tion, scar tissue may form that allows the carpus to be sufficiently extended to sustain flight. This is more likely to occur in large-winged birds on windy days when the birds are able to run, jump and glide for variable distances. Another form of tendonectomy involves removing the insertion point of the superficial pectoralis muscle. This will result in a bird that cannot fly but is cos- metically normal (Figure 46. To perform this pro- cedure, the bird is anesthetized with isoflurane and placed in lateral recumbency. The feathers are re- moved from the ventral side of the humerus directly over the pectoral crest, distal to the level of the scapulohumeral joint. The area is aseptically pre- pared and the skin is incised with a bipolar radiosur- gical unit in a curvilinear manner beginning just distal to the pectoral crest. Bleeding is minimal (bottom) and primary muscle responsible for elevation of the wing. The skin and muscle are bluntly dissected and pushed proximally using a gauze pad to expose the metacarpal bones. The muscle and tendon are separated from the pec- toral crest starting at the ventral edge. A distinct popping sound is audible when the final strands of muscle and tendon are separated from the crest. This muscle elevates the wing and must be of the fibrous connective tissues (tendon and pe- intact to provide the bird with proper balance. The complete radiosurgical destruction propatagialis, crosses the shoulder cranial to the su- of the area of insertion of the superficial pectoralis perficial pectoralis muscle. The tensor propatagialis will prevent the muscle from partially reattaching, is easily identified by grasping and pulling on the which could allow flight. A brided from the humerus by scraping with a scalpel 2 or 3 cm section of the tensor propatagialis is re- blade. The incision should be carefully examined to The insertion of the supracoracoideus muscle on the ensure that the transection is complete. The skin is dorso-medial aspect of the pectoral crest should be closed in a continuous or simple interrupted suture pattern. The mold was manually held in position while dental acrylic was poured onto it using a 3 ml syringe. The ventral half of the template was positioned over the semi-solid acrylic and pushed down in apposition with the dorsal half of the template. Holding the mold in position, the acrylic was allowed to harden (approximately ten minutes) and the mold was re- moved. At this point, a high-speed hand-held drill down stroke of the wing or control to the leading edge with a fine grinding stone was used to do final shap- of the wing and thus, no lift. Postoperative care flighting Anseriformes, Ciconiiformes, Pelecanifor- was uneventful, and the bird immediately started to mes, Galliformes, Gruiformes, Charadriiformes and utilize the new bill and was able to eat, drink and Columbiformes (see Figure 46. Beak injuries that result in an inability to eat, drink and preen will occur in waterfowl. Various attempts Air Sac Cannulation at applying prosthetic bills have been described. The pins were threaded until the Psittaciformes, this procedure is usually performed tapping end was palpated exiting the caudal aspect in the abdominal air sac. Prior to surgery, a two-piece template visualized with minimal dissection (see Anatomy (dorsal and ventral halves) of the upper bill from a Overlay). There were significant increases cotton to prevent possible influx of dental acrylic. The wing is then extended fully over the bird’s back and should approach the mid-line of the body. This places maximum tension on the tendon of insertion of the superficial pectoralis muscle. The insertion of the supracoracoideus muscle on the dorsomedial aspect of the coracoid must be avoided. Alternatively, two hemo- static clips may be applied between the testicle and Ganders may become very aggressive during the the body wall, taking care not to occlude the aorta or breeding season. The ribs are closed in a simple interrupted aggressive bird, some clients will choose to have the pattern with an absorbable suture material. The opposite testicle is removed in a duce aggression toward people and prevent addi- similar manner. The procedure is performed on an reported to maintain their original personality, but anesthetized bird placed in lateral recumbency. The their bellicose nature associated with previous wings are extended and taped above the body. The area of the last two ribs cranial to the femur is plucked and prepped for surgery. Products Mentioned in Text The lungs extend almost to the last intercostal space, a. Retractors EnKamat #7210106, Flatback Erosion Control Systems, are necessary to keep the ribs separated. Harvey-Clark C: Clinical and re- rey, England, Spur Publications, oil-contaminated birds. Fairbrother A: Changes in mallard Intl Symp Erkrankungen der Zoo- ment of vitamin E in ducklings. Lincoln lizing wing after tenectomy and teno- ing young birds with hemostatic logical Observations & Control, Acta University of Nebraska Press, 1968. Kawashiro T, Sheid P: Arterial blood of waterfowl in captive and free-liv- Ventilation through air sac cannula Press, San Diego, 1979. Am J Vet Res 51(7):1071- N (ed): Intl Zoo Yearbook, Vol 13, tabolites, uric acid and calcium in the Co, 1986, pp 346-349. Vet Med Assoc 181(11):1386-1387, Symp Erkankangen der Zootiere, Car- ders of young waterfowl. Redig P: An overview of avian anes- various avian species other than do- ment of aspergillosis by vaccination: ketamine and xylazine in Pekin thesia. Mangili G: Unilateral patagiectomy: and the management of aspergillosis bumblefoot in birds. J Zoo Anim Med, in A new method of preventing flight in and various other problems com- 5(2):25, 1974.
A s e r i e s o f s i x s t a n d a r d c u r v e s w as g e n e r a t e d u s in g t h e a u t o m a te d s y s te m an d co m p a red w it h s i x c u r v e s p r o d u c e d u s in g t h e m a n u a l a s s a y cheap 20mg fluoxetine mastercard. M eans w e r e p l o t t e d f o r t h e r e s p o n s e m e ta m e te r (B /B 0 ) a t e a c h f i x e d p o i n t in t h e s t a n d a r d c u r v e s an d t h e c o e f f i c i e n t s o f v a r i a t i o n w e r e c a l c u l a t e d order fluoxetine online pills. T he a u to m a te d a s s a y sh o w s a lo w e r p o t e n t i a l s e n s i t i v i t y (1 2 p g / t u b e buy fluoxetine canada, 0. S im ila r p r e c i s i o n p r o f i l e s w e r e o b t a in e d f o r t h e a u to m a te d an d m a n u a l a s s a y s. D e t e r m in a t io n s o f s a l i v a r y o e s t r i o l u s in g t h e a u to m a te d an d m an u a l m e th o d s sh ow a v e r y g o o d c o r r e l a t i o n ( r = 0. A lth o u g h t h e a u to m a te d s y s t e m h a s an a d e q u a te p e r fo r m a n c e i n i t s p r e s e n t fo r m , i t i s l i m i t e d i n s e n s i t i v i t y b y t h e r e q u ir e m e n t f o r c o u n t in g t h e u n b ou n d r a d i o l i g a n d f r a c t i o n. I t w as c o n s id e r e d a p p r o p r ia t e t o e s t a b l i s h : ( i ) t h e r e l a t i o n s h i p b e tw e e n p la s m a an d s a l i v a r y u n c o n ju g a te d o e s t r i o l c o n c e n t r a t i o n s , ( i i ) t h e s h o r t te r m ( h o u r ly ) a n d d a i l y v a r i a t i o n s in s a l i v a r y o e s t r i o l c o n c e n t r a t i o n s , ( i i i ) a p r o v i s i o n a l n o rm a l r a n g e f o r s a l i v a r y o e s t r i o l c o n c e n t r a t i o n s. S a l i v a r y o e s t r i o l c o n c e n t r a t i o n s w e r e d e te r m in e d b y t h e d i r e c t , s o l i d - p h a s e m e th o d. P la sm a a l i q u o t s (2 0 0 pL) w e r e e x t r a c t e d w it h d i e t h y l e t h e r (5 mL). E v a p o r a te d e x t r a c t s w e r e r e d i s s o l v e d i n a s s a y b u f f e r (1 mL) an d a l i q u o t s (2 0 0 yL) w e r e a s s a y e d a s d e s c r ib e d f o r s a l i v a s a m p le s. T h e s e r e s u l t s a r e i n g o o d a g r e e m e n t w it h t h o s e r e p o r t e d b y o t h e r w o r k e r s [ 2 , 1 0 ]. T he m ean i n d i v i d u a l v a r i a t i o n o v e r t h i s p e r io d w as 1 4. D a ily v a r i a t i o n s i n s a l i v a r y o e s t r i o l c o n c e n t r a t i o n s w e r e e x p r e s s e d a s p e r c e n t a g e d e c r e a s e s o r i n c r e a s e s co m p a red w it h t h e m ean o f t h r e e p r e c e d in g d e t e r m in a t io n s. T he m ean d a i l y d e c r e a s e s and i n c r e a s e s i n s a l i v a r y o e s t r i o l c o n c e n t r a t i o n s , m e a su r e d i n e i g h t n o rm a l women c o l l e c t i n g d u r in g t h e l a s t t h r e e w e e k s o f p r e g n a n c y , w e r e 17. O f t h e s e 1 5 1 d a i l y d e t e r m in a t io n s t h e r e w e r e f o u r o c c a s i o n s (2. T h e s e f i g u r e s co m p a re som ew h at u n f a v o u r a b ly w it h d a i l y v a r i a t i o n s i n p la sm a u n c o n ju g a te d o e s t r i o l c o n c e n t r a t i o n s r e p o r t e d b y o t h e r w o r k e r s [ 1 2 , 1 3 ]. Our o b s e r v a t i o n s s u g g e s t , h o w e v e r , t h a t i n d i v i d u a l p a t i e n t s sh ow g r e a t d i f f e r e n c e s i n t h e d e g r e e t o w h ic h t h e i r s a l i v a r y o e s t r i o l c o n c e n t r a t io n s v a r y from d ay t o d a y , and i t may b e im p o r ta n t t o a s s e s s t h e s i g n i f i c a n c e o f a p a r t i c u l a r f a l l i n s a l i v a r y o e s t r i o l c o n c e n t r a t io n i n te r m s o f t h e d a i l y v a r i a t i o n show n b y t h a t p a t i e n t. F ig u r e 5 sh o w s t h e g e o m e t r i c a l m ean c o n c e n t r a t io n s o f s a l i v a r y u n c o n j u g a t e d o e s t r i o l d u r in g t h e 3 0 th t o 4 0 th w e e k s o f g e s t a t i o n. Comparison of the normal range for third trimester salivary oestriol obtained in this study (oj with that reported by Fischer-Rasmussen et al. H ow ever i t r e m a in s t o b e show n b y m ean s o f p r o s p e c t i v e s t u d i e s t h a t t h e m e a su r e m e n t o f o e s t r o g e n c o n c e n t r a t i o n s in t h e t h i r d t r i m e s t e r w i l l p r o v id e d a t a t o h e lp t h e o b s t e t r i c i a n t o d e te r m in e t h e t im in g o f d e l i v e r y i n a p a t i e n t i n whom t h e f o e t u s i s a t r i s k [ 14]. The c o n t r o v e r s y c o n c e r n in g t h e c l i n i c a l u s e f u l n e s s o f o e s t r o g e n d e t e r m in a t io n s i s u n l i k e l y t o b e r e s o l v e d u n l e s s s a m p le s a r e ta k e n a t m ore f r e q u e n t i n t e r v a l s , w it h i n d i v i d u a l p r o f i l e s o f o e s t r o g e n l e v e l s b e in g c o n s t r u c t e d th r o u g h o u t t h e t h i r d t r i m e s t e r [ 15]. T h is s tu d y sh o w s t h a t s a l i v a r y o e s t r i o l d e t e r m in a t io n s p r o v id e a u s e f u l a l t e r n a t i v e t o p la sm a u n c o n ju g a te d o e s t r i o l m e a s u r e m e n ts. S p e c i f i c a n t i s e r a f o r r a d io im m u n o a ssa y o f e s t r o n e , e s t r a d i o l - 1 7 ß , an d e s t r i o l , S t e r o i d s _29 (1977) 4 6 1. N orm al c o n c e n t r a t i o n s , d iu r n a l a n d /o r e p i s o d i c v a r i a t i o n s , an d d a y - t o - d a y c h a n g e s i n u n c o n ju g a te d an d t o t a l e s t r i o l i n l a t e p r e g n a n c y p la s m a , Am. Truran indicated that oestriol produced in the foeto-placental unit reached the saliva by way of the maternal bloodstream. The salivary oestriol level thus reflected the plasma level and, considering the circuitous route involved, was remarkably constant. There was a small diurnal variation, with highest levels in the evening; for convenience, samples were collected in the morning. Matched specimens of parotid fluid and saliva, the former obtained with a Carlson-Crittenden catheterization device, taken at 15-min intervals over several hours had shown no significant differences in oestriol level. Maximal stimulation of flow with citric acid had likewise produced no significant change in level. He emphasized, however, that the relative clinical utility of plasma, salivary and urinary oestriol measurements had still to be established. Simple and rapid assays for measuring progesterone and oestradioi in saliva are reported. These assays utilize 12sI-labelled hormones and appear to be of adequate specificity and repro ducibility for use in clinical practice. Oestradiol levels were around 3,13 and 7 pmol/L in the follicular phase, periovulatory period and mid-luteal phase, respectively. Progesterone concentrations were around 110 pmol/L in the periovulatory period and 440 pmol/L in the mid-luteal phase. There was no consistent numerical correlation between concentrations of steroid in serum and saliva but changes in saliva concentra tion reflected those seen in plasma or serum. Oestradiol levels in saliva appeared to be related to the dialysable (‘free’) levels in serum. These may be connected with circadian or menstrual periodicity, or may be caused by the use of dynamic stimulation or suppression tests. The assay of steroids in saliva is becoming a popular alternative to their assay in plasma or serum (1,2,3,4) because the collection of saliva samples is simple, non-invasive, and allows frequent sampling without the need for intervention by medical or paramedical personnel. Assays for hormones in saliva are ideal for use in countries where access to medical facilities is limited and where serial measurements are required for diagnosis or research. Assays for the detection of progesterone and oestradiol in saliva have already been reported (4,6,7) but these published methods require relatively large volumes of sample and involve a solvent extraction step in order to concentrate the steroid. The methods developed in this study utilise iodohistamine labelled hormones and are simple, rapid and able to measure progesterone or oestradiol directly in unextracted saliva. Sample collection and preparation Saliva samples were collected from volunteers with normal menstrual histories. Samples were stored frozen at -20°C until required, and were centrifuged (2000 g for 5 min) before use. Assays for hormones in serum were performed using conventional liquid phase assays (9). These were obtained by pooling count data from assay batches that were performed on consecutive days. As may be seen both assays appear to be stable and generate reproducible standard curves. Saliva pools containing low, medium and high levels of each steroid were assayed at least ten times within an assay batch in order to assess within-batch precision. Summary of procedures used for the measurement o f oestradiol in progesterone in saliva.
However buy fluoxetine 20mg with mastercard, the pro- gressive destruction of joint cartilage and bone represents a unique and most promi- nent feature of this disease buy 10 mg fluoxetine mastercard. They are characterized by a large trusted fluoxetine 20 mg, more round shape than normal synovial ﬁbroblasts, and have large pale nuclei with prominent nucleoli. These changes, together with some alterations in their behavior, suggest these cells to be “trans- formed-appearing” ﬁbroblasts. Although these cells are activated, they do not reveal an increased rate of proliferation. Such events mirror the transformation events that occur in carcinogenesis (see Chapter 11). Apoptosis may alter the synovial lining layer that mediated the progressive destruc- tion of cartilage and bone. Less than 1% of lining cells exhibit morphological fea- tures of apoptosis as determined by ultrastructural methods, and several studies have reported the expression of antiapoptotic molecules such as bcl-2 and sentrin in synovial cells. This dysbalance may lead to an extended life span of synovial lining cells as well as result in a prolonged expression of matrix-degrading enzymes at sites of joint destruction. Activation of synovial cells results in the up- regulation of these adhesion molecules. But, conversely, the expression of early cell cycle genes such as c-fos and c-myc is stimulated further by cell adhesion molecules. Thus, the cellular interactions of neighboring macrophage-like cells, ﬁbroblasts, and also chondrocytes appear to contribute to the perpetuation of chronic synovitis. However, the utilization of viral vectors for gene transfer requires substan- tial changes to the original viral genome. Apart from introducing the desired gene, these changes include modiﬁcations that disable replication of viral particles in infected cells. Transfection of packaging cells, which produce the virus envelope, results in the production of repli- cation-deﬁcient virus particles. This would avoid multiple surgical interventions, which is a major disadvantage of ex vivo approaches. Another limiting factor, however, is the unpredictable site of insertion into the host genome resulting in, at least, a poten- tial risk of insertional mutagenesis. These models have provided important insights into mole- cular mechanisms of joint inﬂammation and helped elucidate key aspects of joint destruction. Therefore, these models have been used to study the effect of gene transfer approaches. However, with respect to the perichondrocytic cartilage degradation, there was a clear effect. Only few implants showed a slight reduction of invasiveness by synovial ﬁbroblasts, which failed to reach statistical signiﬁcance. Therefore, it has been speculated that this increase reﬂects an insufﬁcient inhibitory response of the activated immune system in the synovium. Currently, studies are being performed investigating the feasibility of this approach as well as the delivery of further cytokine genes. One mechanism to block signaling pathways is the utilization of dominant negative mutants of signaling molecules such as c-Raf. Dominant negative (dn) mutants represent mutated variants of these molecules, which lack function. All steps were performed under strict safety condition including the screening for replication-competent retroviruses. The preliminary results of this study indicate that genes can be delivered to human joints safely and effectively. The ﬁnal evaluation of the removed joints will be performed and include conven- tional histological evaluation as well as in situ hybridization and immunohisto- chemistry techniques. Novel strategies to inhibit rheumatoid joint destruction have been pro- posed and developed. There is great potential in the technology of gene therapy for speciﬁcally modifying disease mechanisms in the context of the aggressive behavior of cells resulting in rheumatoid joint destruction. Interfering with the stimulation of synovial cells by cytokines and growth factors 2. Direct inhibition of matrix-degrading enzymes such as matrix metallopro- teinases and cathepsins. Clinical trial to assess the safety, feasibility, and efﬁcacy of transferring a potentially anti-arthritic cytokine gene to human joints with rheumatoid arthritis. Somatic mutations in the p53 tumor suppressor gene in rheumatoid arthritis synovium. Tomita T, Takeuchi E, Tomita N, Morishita R, Kaneko M, Yamamoto K, Nakase T, Seki H, Kato K, Kaneda Y, Ochi T. Suppressed severity of collagen-induced arthritis by in vivo transfection of nuclear factor kappaB decoy oligonucleotides as agene therapy. Federally supported research is regulated by the federal gov- ernment in the context of animal care and their humane use, as well as for the safe and ethical use of humans in clinical trials. A brief historical account of federal regulation is presented along with current regulatory requirements as well as potential future changes in review and approval procedures. Already, sheep, cows, and primates have been cloned using nuclear transfer techniques (see Chapter 2). At that time, using the nuclei of tadpoles transferred into frog eggs, scientists raised cloned tadpoles and even adult frogs. Recent embryonic cloning work was published in 1996 when lambs were reported cloned from embryos. In the case of Dolly, modiﬁcations in the previously successful protocols resulted in the ability to clone using an adult cell, a mammary cell reprogrammed to “dedifferentiate,” and thus permitting the development of an adult animal. In March, 1997, scientist in the United States announced the cloning of primates from embryonic cells using nuclear transfer. These techniques have an obvious extension of cloning humans, and that has startled the research and lay communities alike. Quickly, 10 days after the adult cell cloning study was announced, President Clinton announced a ban on federal funds to support research on cloning of humans. Three months later in June, 1997, the National Bioethics Advisory Commission concluded that, at this time, it is “morally unacceptable for anyone in the public or private sector, whether in research or clinical setting, to attempt to create a child using somatic cell nuclear transfer cloning” (see Suggested Readings). However, this has not stopped mavericks from announcing the attempt to open “Cloning Clinics” in Chicago or elsewhere. These clinics would be a for-proﬁt venture with the noble cause of providing an option of parental cloning for infertile couples. Such announcements have created a public outcry and sent elected ofﬁcials at both the state and federal levels scrambling to establish laws prohibiting the use of cloning technology. This is likely because the frontier continues to rapidly move forward in high proﬁle. The committee wrestles with issues such as the development of genetic testing guidelines. These include criteria regarding the risks and beneﬁts of genetic testing, assisting institutional review boards (see below) in reviewing genetic testing protocols in both academic and commercial settings, the ade- quacy of regulatory oversight of genetic tests, provisions for assuring the quality of genetic testing laboratories, the need for mechanisms to track the introduc- tion of genetic tests to enable accuracy and clinical effectiveness over time to be evaluated, and safeguarding the privacy and conﬁdentiality of genetic informa- tion and preventing discrimination as well as stigmatization based on genetic information.
An 8-year-old boy is found to have progressive corneal vasculari- zation order fluoxetine discount, deafness 10 mg fluoxetine overnight delivery, notched incisors buy fluoxetine with mastercard, and a flattened nose. The mother’s only other pregnancy was unre- markable, and she has never received any blood or blood products. Artificial surfactant is most likely to be used in the treatment of an infant with a. Because of extensive medical intervention, this premature infant survives, but unfortunately he is found to be blind resulting from the use of oxygen. Which one of the listed pathologic abnormalities correctly describes the pathology that caused this infant’s blindness? A 3-month-old female dies during sleep and the cause of death is unknown after autopsy c. A 4-week-old female dies from respiratory complications after being born 10 weeks prematurely d. A 9-month-old male dies and an autopsy finds evidence of repeated bone frac- tures and bilateral retinal hemorrhages e. A male is stillborn at 29 weeks of gestation to a mother with obstetrical com- plications 137. A histologic section from the mass reveals a tumor composed of small, primitive-appearing cells with hyperchromatic nuclei and little to no cytoplasm. Occasional focal groups of tumor cells are arranged in a ring around a central space. Abnormalities involving any of these normal meta- bolic pathways may lead to the accumulation of triglycerides within the hepatocytes. Examples of abnormalities that produce hepatic steatosis include diseases that cause excess delivery of free fatty acids to the liver or diseases that cause impaired lipoprotein synthesis. Excess delivery of free fatty acids occurs in conditions that increase lipolysis of adipose tissue, such as starva- tion, diabetes mellitus, and corticosteroid use. Impaired apoprotein synthesis occurs with carbon tetrachloride poisoning, phosphorous poisoning, and protein mal- nutrition. These second messengers may bind to receptors that are located either on the surface of the cell or within the cell itself. Sub- stances that react with intracellular receptors are lipid-soluble (lipophilic) molecules that can pass through the lipid plasma membrane. Examples of these lipophilic substances include thyroid hormones, steroid hormones, and the fat-soluble vitamins A and D. These proteins, called G proteins, may be classified into four categories, namely Gs, Gi, Gt, and Gq. The adenylate cyclase G protein complex is composed of the following components: the receptor, the catalytic enzyme (i. Cholera toxin keeps the “on switch” in the “on” position, while pertussis toxin keeps the “off switch” in the “off” position. That is, their phagocytic cells have a decreased oxida- tive or respiratory burst. This deficiency results in recurrent infections with catalase- positive organisms, such as S. The classic form of chronic granulo- matous disease usually affects boys and causes death before the age of 10. Key findings in chronic granulomatous disease include lymphadenitis, 82 Pathology hepatosplenomegaly, eczematoid dermatitis, pulmonary infiltrates that are associated with hypergammaglobulinemia, and defective ability of neu- trophils to kill bacteria. A developmental defect at the pre-B stage is seen in X-linked agammaglobulinemia of Bruton, while developmental failure of pharyngeal pouches 3 and 4 is characteristic of DiGeorge’s syndrome. For example, corticos- teroids induce the synthesis of lipocortins, a family of proteins that are inhibitors of phospholipase A2. They decrease the formation of arachidonic acid and its metabolites, prostaglandins and leukotrienes. At birth, breathing decreases pulmonary resistance and reverses the flow of blood through the ductus arteriosus. The oxygenated blood flowing from the aorta into the ductus inhibits prostaglandin pro- duction and closes the ductus arteriosus. Therefore prostaglandin E2 can be given clinically to keep the ductus arteriosus open, while indomethacin can be used to close a patent ductus. Bradykinin is a nonapeptide that increases vascular permeability, contracts smooth muscle, dilates blood vessels, and causes pain. Histamine, a vasoactive amine that is stored in mast cells, basophils, and platelets, acts on H1 receptors to cause dilation of arterioles and increased vascular permeability of venules. It is basically a localized form of suppurative (purulent) inflammation, which is associated with pyogenic bacteria and is characterized by edema fluid admixed with neutrophils and necrotic cells (liquefactive necrosis or pus). Other morphologic patterns of inflammation include serous inflammation, fibrinous inflammation, and pseudomembranous inflammation. Fibrinous inflammation is associated with the deposition of fibrin in body cavities, which subsequently stimu- lates coagulation. Fibrinous inflammation within the pericardial cavity (fibrinous pericarditis) produces a characteristic “bread-and-butter” appearance grossly. Serous inflammation produces a thin fluid, such as is present in skin blisters or body cavities. In contrast to fibrinous inflammation, there is not enough fibrinogen present in serous inflammation to form fibrin. Pseudomembranous inflammation refers to the formation of necrotic mem- branes on mucosal surfaces. Two infections classically associated with pseudomembrane formation are Clostridium difficile, which produces a characteristic “mushroom-shaped” pseudomembrane in the colon of peo- ple taking broad-spectrum antibiotics, and C. In contrast to an abscess, an ulcer is a defect of epithelium in which the epithelial lining is sloughed and is replaced by inflammatory necrotic material. A localized proliferation of fibroblasts and small blood vessels describes granulation tissue, while an aggregate of two of more activated macrophages refers to a granuloma. The excessive secretion of mucus from a mucosal surface refers to catarrhal (phlegmonous or coryzal) inflamma- tion, such as seen with a runny nose. These deficiencies are associated with recurrent thromboembolism in early adult life and recurrent spontaneous abortions in women. The causes of secondary hypercoagulable states are numerous and include severe trauma, burns, disseminated cancer, and pregnancy. Lower risk factors for the development of secondary hypercoagulable states include age, smoking, and obesity. Some patients with high titers of autoantibodies against anionic phospholipids such as cardiolipin (the anti- body being called a lupus anticoagulant) have a high frequency of arterial and venous thrombosis. To summarize, it is important to remember that the differential diagnosis of recurrent spontaneous abortions in women includes deficiencies of protein C and protein S, and the presence of the lupus anticoagulant, which is part of the anti-phospholipid syndrome. Also with autosomal dominant inheritance, children with one affected parent have one chance in two of having the disease (50%). Horizontal transmis- sion refers to finding the disease in siblings but not parents. That is, with General Pathology Answers 85 autosomal recessive disorders, parents are usually heterozygous and are clinically normal, while symptoms occur in one-fourth of siblings.
By A. Ashton. California State University, Fresno.