T. R. C. Greet

Effect of age at presentation on outcome following arthroscopic debridement of subchondral cystic lesions of the medial femoral condyle: 85 horses (1993-2003)

REASONS FOR PERFORMING STUDY Subchondral cystic lesions of the medial femoral condyle (SCMFC) are well documented in horses < or =3 years; arthroscopic debridement or enucleation of the cyst is currently the surgical treatment of choice. However, studies of occurence and outcome following surgery in older horses are lacking. OBJECTIVE To identify factors important in outcome for horses with SCMFC treated by arthroscopic debridement. HYPOTHESIS Age of horse at presentation has a significant influence on return to work following arthroscopic treatment for SCMFC. Clinical and diagnostic findings are also significant with respect to prognosis. METHODS A retrospective review of medical records from 6 equine referral centres identified 85 horses that underwent arthroscopic debridement of SCMFC. Clinical examination, radiographic and arthroscopic findings were analysed together with follow-up data. Univariable analysis and multivariable logistic regression models were used to determine factors affecting return to soundness. Event-time analysis was performed to evaluate return to work. RESULTS Older horses (>3 years) were less likely to return to soundness (P = 0.02) or to work (P = 0.04) than younger horses (< or = 3 years). Of 39 horses age 0-3 years, 25 (64%, 95% CI 49-79%) returned to soundness. Of 46 horses age >3 years, 16 (35%,95% CI 21-49%) returned to soundness. In addition, cartilage damage at sites other than the SCMFC negatively affected prognosis (P = 0.05). The hospital where treatment was performed had no influence on return to soundness. CONCLUSIONS Older horses carry a worse prognosis for both return to soundness and return to work. POTENTIAL RELEVANCE It is important for clients to be made aware of the difference in outcome between age groups.

Electrosurgery as the sole means of haemostasis during the laparoscopic removal of pathologically enlarged ovaries in mares: a report of 55 cases

REASONS FOR PERFORMING STUDY There is little published clinical evidence on the use of a laparoscopic approach for the removal of pathologically enlarged ovaries in standing mares. OBJECTIVES To show the orders of success and complication rates that can be expected if pathologically enlarged ovaries are removed from standing, sedated mares under laparoscopic guidance using only electrosurgical means of haemostasis. METHODS A retrospective analysis was made of 55 mares in which the removal of an enlarged ovary was attempted by applying a standard laparoscopic procedure for routine ovariectomy in standing mares including a reliance solely on one of 2 types of electrosurgical bipolar forceps with an integrated guillotine for haemostasis and transection of the ovarian pedicle. The outcomes and complications encountered were recorded. Logistic regression analysis was performed to identify the risk of any complications associated with the size of the ovary removed and the instrument used. RESULTS In 54 of the 55 mares, the surgery was successfully accomplished by the planned approach. In one mare there was significant intraoperative haemorrhage and this necessitated the additional use of a prosthetic haemostatic device. The only other complications encountered were post operative abdominal discomfort (n = 9), delayed incisional wound healing (n = 6) and iatrogenic uterine puncture (n = 2). One mare developed a rectal tear, but not as a direct complication of the surgical procedure. None of these prevented a long-term successful outcome. CONCLUSIONS The removal of pathologically enlarged ovaries (up to 30 cm diameter) from mares under standing sedation can be accomplished predictably and safely by applying the standard laparoscopic approach that is established for routine laparoscopic ovariectomy, including a reliance solely on endoscopic electrosurgery instruments for haemostasis of the ovarian pedicle. POTENTIAL RELEVANCE This study shows that the simple standing laparoscopic technique now favoured for routine ovariectomy can be used safely and reliably for the removal of pathologically enlarged ovaries. This promises to be of significant clinical advantage to mares so affected.

Outcome and long‐term follow‐up of 20 horses undergoing surgery for caecal impaction: A retrospective study (2000–2008)

REASONS FOR PERFORMING STUDY If untreated, caecal impaction may progress to rupture of the caecum and reports of long-term outcome for horses undergoing surgery for caecal impaction are required. OBJECTIVES To describe short- and long-term complication rates for horses undergoing surgery for caecal impaction in an otherwise life-threatening gastrointestinal condition. METHODS Case records were reviewed for horses undergoing surgery for caecal impaction. Horses were included in the study if an abnormally large, fluid-distended or feed-impacted caecum was the primary diagnosis at surgery and excluded if the caecum had already ruptured upon opening the abdomen, necessitating euthanasia. Short-term follow-up data were obtained from clinical records; and included complications, repeat celiotomy and survival to discharge. Long-term survival was defined as survival for >1 year post operatively. Long-term follow-up data were obtained through telephone interviews with owners and referring veterinary surgeons. Survival, occurrence of post operative colic and subsequent use of the horse were recorded. RESULTS Twenty horses underwent surgery for caecal impaction: 16 horses underwent caecal bypass (typhlotomy and removal of caecal contents, ileal transection followed by ileocolostomy); 3 underwent typhlotomy alone; and one horse underwent typhlotomy followed by a second procedure where caecal bypass was performed. Five horses (25%) were admitted for colic evaluation with primary caecal impactions, in 10/20 (50%) of cases the impaction was secondary to previous orthopaedic surgery and in 5/20 (25%) caecal impaction was identified at repeat celiotomy following a previous colic surgery. Sixty-five percent (13/20) of horses survived to discharge; 11/13 (85%) of horses discharged survived long term; 100% (3/3) horses that received typhlotomy alone were discharged and survived long term. CONCLUSIONS The prognosis following caecal impaction surgery is fair, if the horse survives to discharge then prognosis for long-term survival is good. POTENTIAL RELEVANCE Surgery for caecal impaction carries a fair prognosis for a potentially life threatening disease, in particular where caecal dysfunction is suspected.

Mandibular lymphoma in a three-year-old thoroughbred filly

MANDIBULAR swelling is a common presentation in horses; most cases are caused by dental disease and infection. Neoplasia involving the mandible is uncommon in horses and, with the exception of juvenile ossifying fibroma, has been reported predominantly in middle-aged or older horses ([Pirie and