Rupture of Mitral Chordae Tendineae in Two Horses. Brown, C.M., et al. JA VMA, Vol. 182, No. 3, (1983): 281-283.

In two horses the rupture of the mitral chordae tendineae caused sudden onset of clinical signs. These were due primarily to pulmonary edema, pulmonary hypertension, and subsequent right-sided heart failure.

The horses were evaluated physically, radiographically, and hemodynamical ly . Both had a loud, widely radiat ing pansystolic murmur, predominantly left-sided, and both had pulmonary edema. Right-sided heart pressures were markedly increased in both cases. The diagnoses were confirmed at necropsy.

Ingestion of Ova Investigator: C.R. Reinemeyer Zeitschrift .fur Parasitenkunde 69-547-4549, 1983.

In a prevalence survey of equine small strongyles, 43/8112 (0.53%) were observed to have strongylid ova within the alimentary tract. Small strongyles have previously been observed to attach to the intestine and ingest mucosal tissue and fluids. Vegetable matter and protozoa have. also been discovered in their intestinal contents. The biologic significance of this behavior is unknown, but the prevalence of worms ingesting ova was significantly greater in horse with higher egg counts and larger worm burdens. Ova ingestion is probably accidental, but 4 worms were found with greater than 10 eggs in their alimentary tracts.

Anatomic Nomenclature Used in Equine Practice. Shively, M.J. Equine Practice. Vol. 5, No. 6, (1983): 6-16.

D i a g n o s i s of C a r d i a c L e s i o n s by C o n t r a s t Echocardiography. Banagura, John D. and Pipers, Frank S. JA VMA, Vol. 182, No. 4, (1983): 396-402.

Contrast M-mode echocardiography was utilized to study animals with congenital and acquired cardiac defects. Contrast was produced by the rapid injection of isotonic NaC1 solution, the patient's blood, or indocyation of echo-dense microbubbles that delineated the direction of blood flow in the heart. This technique provided a safe and noninvasive method for imaging the abnormal blood flow associated with ventricular septal defect, tetralogy of Fallot, atrial septal defect, and mitral valve regurgitation. Evaluation of contrast echocardiograms were useful in documenting the presence of these lesions in both small and large animal patients.

Demodieosis Associated with Systemic Glucocorticoid Therapy in Two Horses. Scott, D.W. and White, K.K., Equine Practice, Vol. 5, No. 4, (1983): 31-35.

The rationale behind and history of the standardization of anatomic nomenclature in veterinary medicine are reviewed. Equine anatomic nomenclature equivalents are presented in a listing which correlates unofficial terms with official terms in both Latin and English. Included are terms relating to directions and planes, bones,joints, muscles, ligaments, vessels, viscera and miscellaneous structures. Directional terms and planes are also illustrated by line drawings.

Two species of demodicid mites found in horses and the skin disease conditions attributable to them are described. A case report involving two l-year-old, castrated male cross-bred ponies that developed demodicosis af ter 6 months of experimental systemic glucocorticoid treatment is presented and illustrated with color plates. Although naturally occurring demodicosis is rare in the horse, its possible occurrer~ce as a result of glucocorticoid abuse is considered.

Malignant Hyperthermia-Like Reactions in Three Anesthetized Horses. Manley, Susan V., eta]. JA VMA, Vo'] 183, No. 9, (1983): 85-89.

Cutaneous Onchocerciasis in the Horse: Five Cases in Southwestern British Columbia. Lees, M.J., Kleider, N. and Tuddenham, T.J. Can. Vet. J., Vol. 24, No. 1, (January 1983):3.

During halothane anesthesia in 3 horses, problems encountered included hyper thermia , unusual breathing patterns, and difficulty stabilizing blood pressure. One horse, given succ iny lcho l ine , d e v e l o p e d p r o l o n g e d musc le fasciculations and muscle rigidity That horse developed severe myositis of the triceps, lumbar and gluteal muscles, and was euthanatized the day after surgery. Problems encountered resembled those of malignant hyperthermia.

Use of a Demand Valve for Postoperative Administration of Oxygen to Horses. Waterman, Avril E., Jones, R.S. and Richards, D.L.S. Equine Vet. J., 14,(4), (1982): 290-292.

The use of a demand valve for the administration of oxygen to horses in the post anaesthetic period was evaluated in 12 horses. Six were allowed to breathe spontaneously while the remainder were ventilated. Arterial blood gas analysis confirmed the effectiveness of the valve in correcting the potentially dangerous levels of hypoxaemia which occur postoperatively in laterally recumbent horses allowed to breathe air.

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Five horses were presented because of a dermatitis of the forehead. Unlike previous reports, ventral midline dermatitis was not the major problem, and was present in only two of five cases. All five horses responded to levamisole therapy at a daily dosage of 5.5 g. for one week. Owners were cautioned that repeat therapy may be necessary.

Esophageal Ectasia in a Quarter Horse Colt. Barber, S. M., Mckaughlin, B.G. and Fretz, P.B. Can. Vet. J., Vol. 24, No. 2, (February, 1983): 46.

A one-month-old Quarter Horse colt was presented after a week history of bilateral nasal discharge and respiratory difficulty. The cervical esophagus was greatly dilated, tortuous and filled with diluted milk. A nasogastric tube could not be passed beyond the base of the heart. An aspiration pneumonia was found at postmortem examination and the esophageal segment from the pharynx to the base of the heart was dilated, thin-walled, and had degenerated in size and number of ganglion cells of the myenteric plexus. Muscular hypertrophy of the terminal esophagus had reduced its lumen size. Some

EQUINE VETERINARY SCIENCE