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Anaesth Intensive Care. 2004 Oct;32(5):715-8.

Rate-dependent left bundle branch block during anaesthesia.

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Department of Anaesthesiology and Critical Care, University College of Medical Sciences and GTB Hospital, Shahadra, Delhi, India.


Rate-dependent left bundle branch block during general anaesthesia is rare. Its occurrence makes electrocardiographic diagnosis of acute myocardial ischaemia or infarction difficult. It can also be confused with a slow rate ventricular tachycardia. We present a case of rate-dependent left bundle branch block in a patient with no previous history of ischaemic heart disease. Carotid sinus massage resulted in a decrease in heart rate and reversion to normal sinus rhythm.

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