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  • Title: Surgical and nonsurgical management of patent ductus arteriosus in cats: 28 cases (1991-2012).
    Author: Hutton JE, Steffey MA, Runge JJ, McClaran JK, Silverman SJ, Kass PH.
    Journal: J Am Vet Med Assoc; 2015 Aug 01; 247(3):278-85. PubMed ID: 26176727.
    Abstract:
    OBJECTIVE: To characterize the clinical features and outcome of cats treated for patent ductus arteriosus (PDA) with attenuation (extravascular or intravascular) versus medical treatment only. DESIGN: Retrospective case series. ANIMALS: 28 client-owned cats with congenital PDA. PROCEDURES: Medical records for cats with PDA diagnosed by means of echocardiography were reviewed. Data retrieved included signalment; history; clinical signs; results of physical examination, ECG, echocardiography, and thoracic radiography; response to medical management if attempted; type of attenuation procedure if attempted (surgical or intravascular); procedural details; intraoperative and postoperative (≤ 2 weeks) complications; and long-term (> 2 weeks) complications. Follow-up was obtained from medical records and via telephone interviews. RESULTS: All 28 cats were referred for evaluation of a cardiac murmur, but 17 of 26 (65%) for which initial clinical signs were available did not have overt signs at initial evaluation. Multiple congenital cardiac defects were identified in 6 of 23 (26%) cats. Seventeen of 26 (65%) cats were documented as treated with 1 or more vascular attenuation procedures; vascular attenuation was not attempted in 11 cats receiving an angiotensin-converting enzyme inhibitor or loop diuretic (n = 2) or no medical treatment (9). Surgical ligation was successful in 11 of 15 cats, and coil embolization was successful in 2 cats. Procedural or postoperative complications included death (n = 2), left-sided laryngeal paralysis (2), voice change (1), fever (1), hemorrhage (4), and chylothorax (1). Long-term follow-up was available for 16 of 28 (57%) cats. Three of 4 cats that did not undergo surgical attenuation died of cardiac-related disease. CONCLUSIONS AND CLINICAL RELEVANCE: Results suggested that PDA occurs rarely in cats, and clinical signs and diagnostic findings were consistent with those previously reported for dogs. Surgical versus nonsurgical treatment did not result in a significant difference in life expectancy in this small cohort. Evaluation of laryngeal function after surgical ligation is recommended. Further study of the outcome associated with various treatment options in a larger population of patients is recommended.
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