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Bardaji, A. et al.

Effects of anaesthesia on acute ischaemic arrhythmias and epicardial electrograms in the pig heart in situ.

STUDY OBJECTIVE--The aim of the study was to assess the influence of general anaesthesia on electrocardiographic and arrhythmogenic responses to left anterior descending coronary artery occlusion. DESIGN--Pigs weighing 18-20 kg were anaesthetised with alpha chloralose 100 mg.kg-1 (n = 9) or thiopentone 30 mg.kg-1 (n = 9) and the arrhythmogenic effects of coronary artery occlusion were examined by sequential electrocardiographic measurements every 5 min and arrhythmia analysis every minute over a 60 min period. RESULTS--alpha Chloralose predisposed to lower ST segment elevation (analysis of variance for repeated measurements p less than 0.002), less marked epicardial conduction delay (p less than 0.01) with slower progression to monophasic potentials, and in contrast, to a greater number of episodes of ventricular premature beats (p less than 0.005), ventricular tachycardia (51 v 32 episodes), and ventricular fibrillation (6 v 2 pigs) than barbiturate anaesthesia. CONCLUSIONS--alpha Chloralose and barbiturates exerted opposite electrocardiographic and arrhythmogenic effects in a porcine model of acute myocardial ischaemia. Due to its proarrhythmic effect chloralose should probably be used in studies dealing with spontaneous and induced ischaemic arrhythmias.[1]

References

Effects of anaesthesia on acute ischaemic arrhythmias and epicardial electrograms in the pig heart in situ. Bardaji, A., Cinca, J., Worner, F., Schoenenberger, A. Cardiovasc. Res. (1990) [Pubmed]

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