Anesthesia of Free Ranging African Elephants (Loxodonta africana) During Laparoscopic Vasectomy
American Association of Zoo Veterinarians Conference 2009
Jeffery R. Zuba1, DVM; Douw Grobler2, BVSc, MSc; JJ van Altena2, BSc; Li-Ann Small2, LVT; Dean A. Hendrickson3, DVM, DACVS; Mark Stetter4, DVM, DACZM
1San Diego Wild Animal Park, Escondido, CA, USA; 2Catchco Africa, Inc., Silver Lakes, Pretoria, South Africa; 3College of Veterinary Medicine, Colorado State University, Fort Collins, CO, USA; 4Disney’s Animal Programs, Bay Lake, FL, USA


A successful method to vasectomize free ranging African bull elephants (Loxodonta africana), as an alternative to controversial culling in areas of overpopulation, has been developed by the authors. Patients are anesthetized, intubated, placed into a modified standing position with a sling and crane/capture truck, ventilated as needed, clinically monitored and vasectomized using specialized laparoscopic equipment and protocols. To provide safe anesthesia for elephants undergoing prolonged field procedures, unique anesthetic protocols and equipment were developed. Elephants are anesthetized by dart injection from a helicopter with a combination of etorphine (Novartis Ltd., Isando, South Africa) and azaperone (Stresnil, Janssens Pharmaceutica, South Africa) and reversed with IV injections of diprenorphine (Novartis Ltd.) and naltrexone (Kyron Laboratories, Benrose, 2011, South Africa). A portable venturi-jet ventilator, powered by compressed oxygen, was designed to provide energy and flow characteristics capable of controlling ventilation of elephants up to 7000 kg. Elephant-sized endotracheal tubes were produced with internal diameters of 35–45 mm and lengths of 1.8 m. All patients were monitored at various intervals for temperature, pulse, respiration, blood gas analysis, end tidal CO2, pulse oximetry, direct and indirect blood pressure. Anesthetic related complications noted prior to surgery included severe lactic acidosis and hypertension. During surgery, complications included hypertension; opioid-induced hypoventilation; and iatrogenic hypoventilation due to significantly elevated intra-abdominal pressures needed for surgical visualization during laparoscopy. Once reversed and standing, brief neuropraxia and mild lameness was noted in some animals due to pressure exerted by axillary and inguinal positioning of the support sling during surgery. The ability to control ventilation in the field on mega-vertebrates during prolonged surgery greatly contributed to the success of anesthesia.


The authors would like to thank the following for their intellectual input and insight: Drs. Deena Brenner, Jessica Siegal-Willot, Stan Perkins, David Brunson, Jim Oosterhuis and David Fagan. We also thank the numerous contributions from Karl Storz Veterinary Endoscopy of America, Surgivet/Smiths Medical, Mallard Medical, Dick Munns Company and Colyer Institute.


Speaker Information
(click the speaker's name to view other papers and abstracts submitted by this speaker)

Jeffery R. Zuba, DVM
San Diego Wild Animal Park
Escondido, CA, USA

MAIN : AAZV Conference : Anesthesia of Free Ranging African Elephants
Powered By VIN