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British Journal of Anaesthesia, 1992, Vol. 69, No. 4 368-374
© 1992 The Board of Management and Trustees of the British Journal of Anaesthesia

research-article

I.V. BOLUS ADMINISTRATION OF SUBCONVULSIVE DOSES OF LIGNOCAINE TO CONSCIOUS SHEEP: EFFECTS ON CIRCULATORY FUNCTION

Y.F. HUANG, M.B., B.S., PH.D., R.N. UPTON, B.SC., PH.D., A. J. RUTTEN, B.SC. and W. B. RUNCIMAN, B.SC.(MED.), M.B., B.CH., F.F.A.R.A.C.S., PH.D.

Department of Anaesthesia and Intensive Care, Royal Adelaide Hospital, University of Adelaide S.A. 5000, Australia.
Department of Anaesthesia and Intensive Care, Flinders Medical Centre, Flinders University of South Australia S.A. 5042, Australia.

Correspondence to Y.F.H.

We have studied the effects of subconvulsive doses of lignocaine on circulatory function in five conscious, chronically instrumented sheep. In the absence of overt signs of central nervous system toxicity, 50–, 75– or 100-mg i.v. bolus doses of lignocaine induced reductions in myocardial contractility, as assessed by the maximum rate of increase in left ventricular pressure (L V dP/dtmax, of 17 (SD4)%, 25 (4)% and 33 (4)%, respectively. The durations of these reductions in myocardial contractility were 2–3.5 min. There were no significant changes in cardiac output, coronary artery blood flow, mean arterial pressure, heart rate or left ventricular systolic and diastolic pressures. It is concluded that the initial toxic effects of lignocaine are on the heart rather than the central nervous system, as is generally believed. This negative inotropic effect of lignocaine in vivo may be more deleterious to myocardial function when the heart is compromised by pre-existing disease, or the co-administration of other myocardial depressive drugs.


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