Electrocardiogram changes during xylazine-propofol anaesthesia in dogs: a clinical study.

摘要

Fifteen dogs of different breeds and of either sex presented for surgery were divided into two groups, group I and group II. Eight apparently healthy dogs undergoing elective surgery formed the first group, while seven dogs undergoing surgery with compromised health status formed the second group. All were premedicated with atropine sulphate and xylazine, followed 10 min later by induction of general anaesthesia with intravenous injection of 1% w/v propofol 'to effect' and was maintained with incremental dose(s) of propofol as intermittent boli as and when required. ECG was recorded using Lead II system at a paper speed of 25 mmls before and after premedication and every 15 min after anaesthetic induction, till recovery. The changes observed were tachycardia, bradycardia with 2nd degree heart block, wandering pace maker, ventricular pre-excitation, atrial premature contraction, ST coving, biphasic T waves and peaked T waves.