Intermittent left bundle branch block is uncommon. During anaesthesia,
left bundle branch block may be related to hypertension or tachycardi
a and its ischaemia or infarction difficult. Patients with intermitten
t left bundle branch block often develop established left bundle branc
h block, which may represent an earlier state of ischaemic heart disea
se. Cardiological investigation of our patient after operation did not
point towards an organic cause of intermittent left bundle branch blo
ck.