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1 June 2012 RISK FACTORS ASSOCIATED WITH PERIANESTHETIC MORTALITY OF STRANDED FREE-RANGING CALIFORNIA SEA LIONS (ZALOPHUS CALIFORNIANUS) UNDERGOING REHABILITATION
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Abstract

The objective of this study was to identify risk factors associated with perianesthetic mortality of stranded free-ranging California sea lions (Zalophus californianus) undergoing rehabilitation. Hospital records of California sea lions that underwent heavy sedation or general anesthesia from 2004 through 2008 were reviewed, including records from 419 anesthetic events. Procedures that resulted in death during or in the subsequent 72 hr of anesthesia were classified as cases (n = 15). Procedures in which the animal survived were classified as controls (n = 334). Procedures that resulted in euthanasia (n = 70) were removed from subsequent analysis. The following risk factors were reviewed: gender, age class, health status, duration of anesthetic period, atropine premedication, induction protocols, maintenance protocols, and history of prior anesthesia. The prevalence of fatalities during anesthesia was 3.4% (n = 12) over the 5-yr period. With the inclusion of animals that died within 72 hr after anesthesia, the total mortality prevalence rose to 4.3% (n = 15). The most common time of death was during anesthetic maintenance. Health status was the single best predictor of anesthetic outcome, and sea lions premedicated with atropine had increased odds of anesthetic-related death.

American Association of Zoo Veterinarians
Elizabeth M Stringer, William Van Bonn, Sathya K Chinnadurai, and Frances M. D Gulland "RISK FACTORS ASSOCIATED WITH PERIANESTHETIC MORTALITY OF STRANDED FREE-RANGING CALIFORNIA SEA LIONS (ZALOPHUS CALIFORNIANUS) UNDERGOING REHABILITATION," Journal of Zoo and Wildlife Medicine 43(2), 233-239, (1 June 2012). https://doi.org/10.1638/2010-0148.1
Received: 20 August 2010; Published: 1 June 2012
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