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Biomedical subjects

G Wyn-Jones

Publications and source records attributed to G Wyn-Jones.

At least 19 recordsLinked to original sources
PubMed1987

Identification of hindleg lameness.

The use of markers placed over the tuber coxae on each side of a horse to aid identification of the relative movement of these structures at the trot, for teaching and research purposes, is described. In each case of hindleg lameness studied, the tuber coxae on the lame side showed a consistent increase in vertical displacement relative to that of the contralateral limb, and a characteristic pattern of movement throughout the stride irrespective of the site or cause of pain.

Animals↗
PubMed1987

Contrast radiography in the investigation of sinus tracts and abscess cavities in the horse.

Contrast radiography is a valuable technique in the investigation of infected foci in the horse. Its simplest form, a metal probe, will demonstrate the direction and, in the case of a short tract, the extent of the lesion. However, liquid contrast agents often give more information by following the course of long, tortuous sinus tracts, accurately delineating the boundaries of lesions and identifying the presence of foreign bodies.

Abscess↗
PubMed1986

Surgical arthrodesis for the treatment of osteoarthrosis of the proximal intertarsal, distal intertarsal and tarsometatarsal joints in 30 horses: a comparison of four different techniques.

Over a period of seven years, 30 horses were treated by surgical arthrodesis for lameness resulting from osteoarthrosis of the proximal intertarsal, distal intertarsal and tarsometatarsal joints (bone and occult spavin). Twenty-five horses were affected in one hock only and five were affected bilaterally. Four different techniques for achieving arthrodesis were used. Fourteen out of 18 horses (78 per cent) with involvement of the distal intertarsal and tarsometatarsal joints only and six out of 11 horses (55 per cent) in which the proximal intertarsal joint was also involved became sound following surgery. The status of one other horse, with involvement of the proximal intertarsal joint, is not known.

Animals↗
PubMed1986

Temporary bilateral carotid artery occlusion as an aid to nasal surgery in the horse.

One of the major obstacles to successful intranasal surgery in the horse is haemorrhage, even minor interferences causing profuse bleeding. Conventional techniques for haemostasis are ineffective or inhibit the progress of the surgery. Temporary bilateral occlusion of the common carotid artery resulted in a substantial reduction in haemorrhage during intranasal surgery in five horses, with much improved visibility and facility of operation. The large contribution to the circle of Willis by the ventral spinal artery is believed to prevent cerebral ischaemia during this procedure. This paper describes the technique of temporary bilateral ligation of the common carotid artery and emphasises the importance of ancillary techniques such as packing of the nasal cavity and general postoperative management.

Animals↗
PubMed1986

Iopamidol myelography in the horse.

The use of the non-ionic, water-soluble contrast agent iopamidol for myelography in seven horses is described. Contrast columns of diagnostic quality were produced in all seven cases and the procedure did not invoke any adverse reactions in the five cases which were recovered from general anaesthesia. It is concluded that iopamidol is a safe and effective contrast agent for myelography in the horse.

Animals↗
PubMed1986

Treatment of guttural pouch mycosis.

Seventeen cases of guttural pouch mycosis (including two bilaterally affected cases) were diagnosed in a three year period. The presenting signs were, in order of frequency, epistaxis at rest, nasal catarrh, pharyngeal paralysis, ipsilateral laryngeal hemiplegia, swelling of the submandibular/parotid region, extension of the head and neck and dyspnoea. Ligation of the origin of the internal carotid and occipital arteries was attempted in 10 of the cases exhibiting epistaxis. Bilateral ligation was performed on one animal with an untoward sequelae. Where surgery was successfully completed further haemorrhage was prevented in eight out of nine affected pouches (89 per cent). Medical treatment involving local administration of various antifungal preparations via a specially designed catheter and/or the oral administration of benzimidazole drugs was successful in eliminating the mycotic plaque in most cases. Cases which presented with pharyngeal paralysis were all fatal.

Animals↗
PubMed1985

Case of quadrilateral flexural contracture in a 10-year-old pony.

The management of a case of quadrilateral flexural contracture in a 10-year-old pony is described. The animal was restored to normal appearance and function through a combination of surgical desmotomy and management techniques; the importance of analgesia and exercise as adjuncts to surgery is emphasised. The aetiology and pathogenesis of the condition in the immature animal and the adult is compared and a possible association is made between this condition and palmar fibromatosis (Dupuytren's contracture) occurring in man.

Anesthesia, General↗
PubMed1985

Interpreting radiographs 6: Radiology of the equine head (Part 2).

The value of radiology as part of an examination of the equine head is emphasised and the radiological appearances of more commonly occurring conditions are described. Even the normal anatomy of this complex site is subject to great variation and the aspiring radiologist should, therefore, have a good knowledge of the possible normal variations. A flexible approach must be used rather than a limitation to one or two ritual projections. The use of contrast media, wherever it might be useful, is advocated so that the maximum amount of information may be obtained from each examination. Finally, emphasis is laid on the fallibility of radiology when used in isolation and its use to complement other investigative procedures, such as endoscopy, is encouraged.

Animals↗
PubMed1983

Case of equine goitre.

A brief review of the literature on equine goitre is presented, together with a case of congenital goitre in a foal. This animal showed localised swelling of the neck, hyperextension of the lower limbs and initial difficulty in sucking. The goitre was removed surgically and the hyperextension successfully treated with surgical shoes and bandaging. The cause was probably iodine deficiency coupled with a goitrogen in the diet.

Animal Nutritional Physiological Phenomena↗
PubMed1983

Treatment of equine cutaneous neoplasia by radiotherapy using iridium 192 linear sources.

The treatment of equine cutaneous tumours by conventional or cryosurgical techniques can be limited where the position of the tumour makes radical excision or freezing impractical or dangerous. Radiotherapy provides an effective and practical alternative. The use of iridium pins with guide needles allows accurate positioning of sources and uniform radiation fields to be achieved. The subsequent removal of the pins reduces the period of incapacity and reduces the radiation risk when compared to permanently implanted sources. Twenty-seven tumours on 26 horses were treated by this method with a 100 per cent success rate after a single irradiation. The technique of implantation is described and the criteria used to select cases and to assess the efficacy of this treatment are discussed.

Animals↗
PubMed1980

A clinical and immunopathological study of Brucella abortus strain 19--induced arthritis in cattle.

From a series of 11 calves presenting with a clinical unilateral gonitis (inflammation of the stifle), six were subjected to serological examination for titres against Brucella abortus and to subsequent post mortem examination. Tissues from five calves studied showed similar clinical and radiological features with post mortem examination confirming the presence of characteristic arthritic lesions in the affected stifle and other joints. The immune studies indicated the presence of B abortus strain 19 antigenic material within the cells of the stifle, synovial membrane and the drainage lymph nodes. Attention is drawn to the apparent absence of intact brucella organisms and to the incompatibility between some of the serum agglutination titres and the results of the immune studies. It is concluded that the absence of an elevated serum agglutination titre to B abortus is not an indication of the absence of B abortus antigenic material and that B abortus strain 19 under certain circumstances is pathogenic to calves causing a characteristic and serious clinical syndrome.

Animals↗