Medetomidine, ketamine, and sevoflurane for anesthesia of injured loggerhead sea turtles: 13 cases (1996-2000).
OBJECTIVE
To determine safety and efficacy of an anesthetic protocol incorporating medetomidine, ketamine, and sevoflurane for anesthesia of injured loggerhead sea turtles.


METHODS
Retrospective study.


METHODS
13 loggerhead sea turtles.


METHODS
Anesthesia was induced with medetomidine (50 microg/kg [22.7 microg/lb], IV) and ketamine (5 mg/kg (2.3 mg/lb], IV) and maintained with sevoflurane (0.5 to 2.5%) in oxygen. Sevoflurane was delivered with a pressure-limited intermittent-flow ventilator. Heart rate and rhythm, end-tidal partial pressure of CO2, and cloacal temperature were monitored continuously; venous blood gas analyses were performed intermittently. Administration of sevoflurane was discontinued 30 to 60 minutes prior to the end of the surgical procedure. Atipamezole (0.25 mg/kg [0.11 mg/lb], IV) was administered at the end of surgery.


RESULTS
Median induction time was 11 minutes (range, 2 to 40 minutes; n = 11). Median delivered sevoflurane concentrations 15, 30, 60, and 120 minutes after intubation were 2.5 (n = 12), 1.5 (12), 1.25 (12), and 0.5% (8), respectively. Heart rate decreased during surgery to a median value of 15 beats/min (n = 11). End-tidal partial pressure of CO2 ranged from 2 to 16 mm Hg (n = 8); median blood gas values were within reference limits. Median time from atipamezole administration to extubation was 14 minutes (range, 2 to 84 minutes; n = 7).


CONCLUSIONS
Results suggest that a combination of medetomidine and ketamine for induction and sevoflurane for maintenance provides safe, effective, controllable anesthesia in injured loggerhead sea turtles.
D019162:Anesthetics, Combined; D000778:Anesthetics, Dissociative; D018685:Anesthetics, Inhalation; D000818:Animals; D001784:Blood Gas Analysis / Q000662:veterinary; D004305:Dose-Response Relationship, Drug; D005260:Female; D006339:Heart Rate / Q000187:drug effects; D006993:Hypnotics and Sedatives; D007649:Ketamine; D008297:Male; D020926:Medetomidine; D008738:Methyl Ethers; D010313:Partial Pressure; D012189:Retrospective Studies; D012449:Safety; D000077149:Sevoflurane; D013997:Time Factors; D016896:Treatment Outcome; D014426:Turtles / Q000293:injuries / Q000502:physiology*
D019162:Anesthetics, Combined; D000778:Anesthetics, Dissociative; D018685:Anesthetics, Inhalation; D006993:Hypnotics and Sedatives; D008738:Methyl Ethers; D000077149:Sevoflurane; D007649:Ketamine; D020926:Medetomidine