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1.
Dynamic nasopharyngeal collapse with upper airway obstruction is an important cause of exercise intolerance in performance horses. Its underlying pathophysiology is not fully understood. We hypothesize that head position affects pharyngeal diameter, and thus head position may be a contributing factor to nasopharyngeal obstruction. Fifteen adult healthy horses were subjected to endoscopy and radiography at rest. The pharyngeal diameter was measured at nine different head and neck positions. The effect of sedation and breathing cycle on the pharyngeal diameter was determined, and the relationship between the head angle and the pharyngeal diameter was analyzed. There was a significant influence of head and neck position on pharyngeal diameter, with head position having the major effect (P<0.001); neck position was less important, but still significant (P<0.05). The smallest pharyngeal diameter was found at the dorsal, flexed position, which is a clinically important head position in dressage horses. The largest pharyngeal diameter was found at the extended midway position. At each head level, the pharyngeal diameter decreased with flexing the head and it increased with extending the head. The head angle was not associated with pharyngeal diameter, and neither sedation status nor breathing cycle significantly affected pharyngeal diameter. A decrease in pharyngeal diameter will limit the airflow through the upper respiratory tract, and it may result in turbulence with subsequent dynamic collapse. Head and neck position should therefore be considered a possible contributing factor in horses with suspected nasopharyngeal dysfunction.  相似文献   

2.
An unusual form of strangulation of mesentery only by pedunculated lipoma was identified as the cause of moderate to severe colic in four horses. The small intestinal mesentery was involved in three horses and the small colon mesentery in the fourth horse, but the associated intestine was not strangulated, haemorrhagic, nor obviously obstructed in any horse. In all horses, a patch of haemorrhagic mesentery of variable size was evident around the origin of a mesenteric lipoma and a major mesenteric vessel. One horse was subjected to euthanasia at the owner's request and the remaining three had surgery from which they made a complete recovery after the removal of the lipoma. Intestinal resection was not performed in any of the three horses undergoing surgery. An isolated mesenteric strangulation by lipoma is an uncommon cause of colic in older horses that have the typical presentation of a strangulating lipoma. The removal of the involved lipoma without mesenteric or intestinal resection can be associated with complete recovery.  相似文献   

3.
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4.
REASONS FOR PERFORMING STUDY: A common opinion among riders and in the literature is that the positioning of the head and neck influences the back of the horse, but this has not yet been measured objectively. OBJECTIVES: To evaluate the effect of head and neck position on the kinematics of the back in riding horses. METHODS: Eight Warmblood riding horses in regular work were studied on a treadmill at walk and trot with the head and neck in 3 different predetermined positions achieved by side reins attached to the bit and to an anticast roller. The 3-dimensional movement of the thoracolumbar spine was measured from the position of skin-fixed markers recorded by infrared videocameras. RESULTS: Head and neck position influenced the movements of the back, especially at the walk. When the head was fixed in a high position at the walk, the flexion-extension movement and lateral bending of the lumbar back, as well as the axial rotation, were significantly reduced when compared to movements with the head free or in a low position. At walk, head and neck position also significantly influenced stride length, which was shortest with the head in a high position. At trot, the stride length was independent of head position. CONCLUSIONS: Restricting and restraining the position and movement of the head and neck alters the movement of the back and stride characteristics. With the head and neck in a high position stride length and flexion and extension of the caudal back were significantly reduced. POTENTIAL RELEVANCE: Use of side reins in training and rehabilitation programmes should be used with an understanding of the possible effects on the horse's back.  相似文献   

5.
A clinical coma scale modified from the Glasgow Coma Scale used for humans has been suggested as a useful predictor of outcome in the head trauma patient. The objective of this study was to correlate the modified Glasgow Coma Scale (MGCS) score of dogs with head trauma with their probability of survival. Thirty-eight dogs with head trauma were selected and retrospectively evaluated. The information retrieved from the medical record of each dog included signalment, body weight, cause of head trauma, MGCS, presence of concurrent neck pain, and outcome (dead or alive) after 48 hours. Logistic regression was used to model survival in the 1st 48 hours as a function of MGCS, gender, weight, and calvarial fractures. The MGCS ranged from 5 to 18. Seven dogs died within 48 hours of the head trauma. The MGCS could predict the probability of survival in the 1st 48 hrs after head trauma with 50% probability in a patient with a score of 8. Gender, weight, and presence of skull fractures did not predict survival. In conclusion, the MGCS is a useful index for prediction of outcome in dogs with head trauma.  相似文献   

6.
犬猫单纯的股骨头颈部骨折临床上较少,其发病原因是骨盆或股骨受到直接或间接的外力导致,也常继发于髋关节发育不良导致的骨质疏松,轻微的外力就可造成动物的股骨头颈部骨折。介绍了猫股骨头颈部骨折的临床症状、诊断及治疗过程,以供参考。  相似文献   

7.
It has been suggested that a combination of large head and long neck cause abnormal forces on the cervical vertebral column and are involved in the pathogenesis of cervical spondylomyelopathy (CSM) in Great Danes. The aim of this study was to compare the body conformation of 15 clinically normal and 15 CSM-affected Great Danes. There were no statistically significant differences between clinically normal and CSM-affected Great Danes in any body measurements. There were no significant associations between body conformation and the severity of neurological signs or cervical vertebral body dimensions determined by magnetic resonance imaging in CSM-affected Great Danes. The results of this study do not support the hypothesis that differences in body conformation related to head size, neck length, and body height and length, play a role in the pathogenesis of CSM in Great Danes.  相似文献   

8.
Strangulation obstruction was induced in anesthetized ponies for periods of 2 and 3 hours by clamping 45-cm segments of jejunum and associated veins (venous strangulation obstruction) and arteries and veins (arterial and venous strangulation obstruction). Four segments were studied in each of 7 ponies allowed to survive 12 hours, 2 segments in a pony that was allowed to survive 1 hour, and 1 segment in each of 10 ponies allowed to survive 42 days after the strangulation periods ended. Fifteen minutes after the periods of strangulation obstruction ended, the viability of test segments was assessed by clinical judgment (40 segments), fluorescein fluorescence (40 segments), and Doppler ultrasound (32 segments). Because the test segments were normal at necropsy in long-term survivors, all segments were designated as viable. The overall accuracy of the methods used to predict viability was 88% for Doppler ultrasound and 53% each for clinical judgment and fluorescein fluorescence (P less than 0.005). Failures in the last 2 techniques could be attributed to their tendency to score venous strangulation obstruction segments as nonviable (90% for each). Doppler ultrasound was 94% accurate in these segments.  相似文献   

9.
In 214 cases of severe dystocia in mares, of which 141 (66 per cent) were Draught horses, deviation of the head and neck, with or without torticollis, malformed head and limbs were found to be the cause of dystocia. No evidence of a genetic lethal factor was found and torticollis was often combined with scoliosis of the head and, frequently, with malformation of one or more limbs. This is considered evidence of a common aetiology and pathogenesis of the syndrome of malformation. The malformations were found to be associated with an increased incidence of caudal and, particularly, transverse presentations. These findings are presented as evidence to support the hypothesis that, during the second half of pregnancy, the narrow tip of the uterine horns provides only limited space for the developing cranial half of the foetus. The surprisingly rapid and complete anatomical and functional recovery of severe malformations of the bones of the neck, head and limbs of surviving foals, born by caesarian section, is taken as further evidence that these malformations have no genetic basis, but originate from unfavourable intrauterine conditions.  相似文献   

10.
OBJECTIVE: To report the use of arthroscopy and total hip arthroplasty (THA) for management of intermediate grade fibrosarcoma of the femoral head in a dog. STUDY DESIGN: Clinical case report. ANIMAL: A 6-year-old spayed female Rottweiler presented for evaluation of acute-onset of lameness of the right pelvic limb of approximately 10 days duration. METHODS: Coxofemoral arthroscopy was performed to obtain fine needle aspiration and Jamshidi biopsy of a lytic lesion of the femoral head. A cemented THA was performed removing as much of the femoral neck and proximal femur as possible while not compromising implant or joint stability. RESULTS: Histologic evaluation of specimens from the femoral head and neck remnants confirmed an intermediate grade fibrosarcoma. Fifteen months after THA, subjectively there was normal use of the right limb with only limited decrease in range of motion and mild muscular atrophy. Radiographs demonstrated stationary positioning of the THA implants. CONCLUSIONS: Arthroscopy of the coxofemoral joint is an effective diagnostic tool for evaluation of disease of the articular structures and canine total hip replacement may be an appropriate means of limb salvage in rare cases of disease of the femoral head. CLINICAL RELEVANCE: This case provides support for the use of coxofemoral arthroscopy as a diagnostic tool as well as an aid in acquiring representative intraarticular tissue samples. Additionally, the case presented demonstrates the potential use of THA as a limb sparing technique in cases of disease affecting the femoral head of dogs.  相似文献   

11.
Currently, there is no standard protocol for removal of regional lymph nodes for the staging of head and neck cancers in dogs. Palpation and fine needle aspiration of mandibular lymph nodes are most commonly performed for staging of head and neck cancers. Although cytology is commonly performed for staging of head and neck, cancers histopathology is required for definitive lymph node staging. When regional lymph node biopsy is performed, mandibular lymph nodes are most commonly sampled due to their accessibility. The medial retropharyngeal lymph nodes may be the most relevant draining lymph node of the head and neck, but they are not routinely sampled due to their anatomic location medial to the salivary glands. The technique described here will allow for a standardized surgical approach for the efficient removal of both mandibular and medial retropharyngeal lymph nodes for staging of head and neck tumours via a single ventral midline approach.  相似文献   

12.
Strangulation colic often leads to surgery. We aimed to document the molecular response in the non-resected intestine in these horses using quantitative Western blot analysis, and immunohistochemistry. The expression of hypoxia-inducible factor 1-alpha (HIF1α) was investigated together with two molecular pathways initiated after protein destruction: proteasome degradation via ubiquitin chain formation and protein restoration via molecular chaperones such as inducible heat shock protein 70 (HSP70). In addition, the expression of c-fos and c-jun could indicate an early proinflammatory response. Ubiquitin, HSP70, c-jun and c-fos protein levels did not differ between the control and colic samples nor were they related to the clinical outcome in case of strangulation colic. However, the immunohistochemical distribution of several of these proteins (ubiquitin, HSP70 and c-jun) differed significantly between colic and control samples. The elevated presence of ubiquitin in the enterocytes’ nucleus, of HSP70 in the smooth muscle cells’ nucleus and of c-jun in enteric neurons suggest protective and degenerative pathways are activated in the apparently healthy non-resected tissue in case of strangulation obstruction, perhaps providing a molecular and morphological basis for the development of complications like post-operative ileus.  相似文献   

13.
OBJECTIVE: To test the hypothesis that strangulation of the small intestine by a lipoma or in the epiploic foramen is more common in older horses. DESIGN: Retrospective study. ANIMALS: 46 horses. PROCEDURE: Ages of horses with strangulation of the small intestine by a lipoma (n = 29) or in the epiploic foramen (17) were compared with ages of 79 horses with miscellaneous small intestinal lesions. Effects of increasing age on risk of the diseases of interest were examined by use of logistic regression and a 1-sided trend test for binomial proportions. RESULTS: Mean age of the horses with strangulation in the epiploic foramen (9.6 years) was the same as that for the horses with miscellaneous small intestinal lesions (7.7), but mean age of the horses with strangulation by a lipoma (19.2) was significantly greater than that for the other groups. The proportion of horses with lipoma increased significantly with increasing age, but the proportion with strangulation in the epiploic foramen did not. CONCLUSIONS AND CLINICAL RELEVANCE: Results refute the current suggestion that increasing age predisposes horses for strangulation of the small intestine in the epiploic foramen but support the suggestion that the risk of strangulation of the small intestine by a lipoma increases with age.  相似文献   

14.
A 6-year-old, standardbred mare was presented for colic of 12 h duration. Transrectal palpation revealed intestinal distension of unknown cause. The mare was euthanized. At necropsy, segmental jejunoileal incarceration and strangulation through an opening in the spleen was observed. This opening was considered to be a congenital defect.  相似文献   

15.
A 5‐year‐old Warmblood mare was presented to the clinic 8 h after being found by the owners with luxation of the second cervical vertebra. Clinically, the horse showed an extended posture and reduced movement of the head and neck. A defined lateral swelling of the neck at the level of the first cervical vertebrae was evident. Successful reduction was achieved with the horse under general anaesthesia in lateral recumbency using an electrically powered hand pallet truck. The mare showed no neurological disorders before or after reduction. Seven months after the incident the mare could be ridden and exhibited no functional abnormalities relating to the neck.  相似文献   

16.
Several mature Leghorn-type hens with the same genetic background experienced skin and feather problems in a breeder flock. There was almost-total feather loss on the head and neck, as well as thickened, scaly skin, and follicular ostia were plugged with keratin debris. Other individuals exhibited prominent subcutaneous nodules multifocally on the head. Histologic examination of the skin revealed a severe hyperplasia of follicular epithelium with hyperkeratosis and cystic dilation. Numerous clefts and vesicles were detected along the epidermis and follicular epithelium, some containing acantholytic keratinocytes. A mild heterophilic inflammation was associated with these lesions, and few gram-positive cocci were present in the keratin plugs. Bacterial culture of the skin yielded a variable amount of Staphylococcus hyicus. Immunochemistry looking for chicken IgY revealed no intercellular staining in the epidermis or follicular epithelium. All these findings supported a diagnosis of Staphylococcus-associated acantholytic epidermitis and folliculitis. This case suggests that S. hyicus could be a significant pathogen in poultry production. The close genetic relationship among affected individuals could indicate a hereditary predisposition in this line of White Leghorn laying chickens.  相似文献   

17.
Congenital or acquired feline femoral dysplasia have seldom been reported in the literature. This report describes two cases of femoral dysplasia involving the proximal epiphyses. Bilateral agenesis of the femoral head and neck (case 1) constituted an incidental finding during a post-traumatic radiographic examination, while right proximal femoral dysplasia (case 2) was observed during an orthopaedic examination for lameness. To the authors' knowledge, such imaging findings have not been reported before in cats.  相似文献   

18.
Sixteen normal 20 to 30 kg dogs had standard femoral head and neck excision (8 dogs) or femoral head and neck excision with interposition of a biceps muscle flap (8 dogs). Lameness lessened at week 6, and did not differ between groups; neither group returned to a completely normal gait. Weightbearing decreased on the operated pelvic limb compared to controls (forceplate analysis). Weightbearing force of the muscle flap dogs was significantly less at weeks 6 and 16 than that of the standard femoral head and neck excision dogs. The operated limb of both groups was shortened; shortening was significantly greater for the muscle flap group. Hip extension was limited in both groups. Both groups had decreased (more acute) hip, stifle, and hock angles measured in standing position. Thigh muscle atrophy was more pronounced in the muscle flap group at week 6. More soft tissue was interposed in the muscle flap group at necropsy compared to the group with standard femoral head and neck excision, but the difference was not statistically significant. Skeletal muscle fibers were present in the interposed fibrous connective tissue of the muscle flap group, and the healed surfaces were smoother than those of the standard femoral head and neck excision group.  相似文献   

19.
A twelve year old Quarterhorse mare exhibited subcutaneous emphysema of the head, neck, upper forelimbs and thorax, and walked with a stiff gait, characterized by decreased flexion of the forelimbs. Endoscopy of the trachea revealed a small tracheal wound ninety centimeters from the external nares. The location of the lesion corresponded with a seroma present at the base of the neck. The subcutaneous emphysema and the seroma resolved without specific therapy. Blunt trauma was suggested as the cause of the tracheal lesion and subsequent subcutaneous emphysema.  相似文献   

20.
通过实际观察、考察育种记录、遗传分析和适合性检验,分析了秦皇岛市波尔山羊繁育改良中心1998 -2003年度波尔山羊、唐山奶山羊以及波尔山羊对唐山奶山羊级进杂交后代的肉垂、头颈部毛色特征遗传规律;同时研究了波唐级进杂交改良后代肉垂、头颈部毛色特征与早期体重之间的相关性。结果表明:波尔山羊的无肉垂以及头颈部毛色特征两性状分别由不同常染色体上的隐性基因控制,肉垂有无对早期体重无显著影响,而头颈部毛色特征对早期体重有显著影响,白色头颈的初生重和2月龄体重显著高于波尔类型的相应指标(P<0.05)。  相似文献   

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