Key result
LV endocardial pacing produces an unusual ECG pattern deviating from expected RBBB in complete AV block.
Left ventricular endocardial pacing can produce unusual electrocardiographic patterns beyond the expected complete right bundle branch block.
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Atypical QRS patterns during LV endocardial pacing warrant ECG interpretation caution in structural disease; leaves open mechanisms in inflamed myocardium.
Pacemaker stimulation of the left ventricle is expected to yield a pattern of complete right bundle branch block, however, unusual patterns have been reported. The present report is a case of an unusual electrocardiographic pattern from left ventricular endocardial pacing in a patient with an atrial septal defect and acute myocarditis complicated by complete degree atrioventricular block.
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Huang et al. (1980) studied this question. Left ventricular endocardial pacing produced an unusual electrocardiographic pattern, deviating from the expected right bundle branch block, in a patient with complete atrioventricular block.
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