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British Journal of Anaesthesia, 1988, Vol. 60, No. 6 671-679
© 1988 The Board of Management and Trustees of the British Journal of Anaesthesia

research-article

EFFECTS OF LIGNOCAINE AND BUPIVACAINE ON REGIONAL MYOCARDIAL FUNCTION AND CORONARY BLOOD FLOW IN ANAESTHETIZED DOGS

B. J. LEONE, B.Sc.(MED.), M.B. B.CH., PH.D., F.F.A.R.A.C.S.{dagger}, J. J. LEHOT, W. B. RUNCIMAN{ddagger}, R. N. WELDING{dagger}, J. G. RAMSAY, B.Sc., M.D., F.R.C.P.(C); C. C.{ddagger}, C. C. ARVIEUX, M.D.§, W. A. RYDER and P. FOË, XM.D., D.PHIL., F.F.A.R.C.S.

Nuffield Department of Anaesthetics, The Radcliffe Infirmary, University of Oxford Oxford OX2 6HE.

Empirical i.v. doses of lignocaine or bupivacaine of equal local anaesthetic potency were administered to halothane-anaesthetized dogs. Both local anaesthetics caused the expected depression of global haemodynamic function. Regional myocardial systolic shortening was depressed similarly by both agents. Regional myocardial dysfunction, seen as post-systolic shortening, occurred to a similar extent with both lignocaine and bupivacaine. Coronary blood flow and coronary perfusion pressure were significantly correlated during the administration of lignocaine; bupivacaine had erratic effects on coronary blood flow and no correlation between coronary blood flow and coronary perfusion pressure was seen. These results suggest that regional myocardial dysfunction occurs with both local anaesthetics and does not account for the apparent increased cardiotoxicity of bupivacaine. Bupivacaine did, however, cause wider individual variations compared with lignocaine with respect to coronary blood flow.

*Departement d'Anesthésie-Réanimation, Hôpital Cardiovasculaire et Pneumologique L. Pradel, B.P. Lyon-Montchat 69394 Lyon Cedex 3, France

{dagger}Department of Anaesthesia and Intensive Care, Flinders Medical Centre Bedford Park, South Australia 5042, Australia

{ddagger}Royal Victoria Hospital, Department of Anaesthesia, 687 Pine Avenue West, Montreal, Quebec, Canada H3A 1A1.

§Departement d'Anesthésie-Réanimation, Centre Hospitalier Universitaire de Grenoble, 38700 La Tronche, France.


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