A right bundle branch block is defined by a wide QRS (> 120 ms), a dominant R wave in V1 and a RSR’ pattern (“M”) in V1 with a wide S wave (“W”) in V6.See also: BBB/Hemiblocks
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This ECG is from a man in his 60s who presented with abdominal pain dyspnoea and altered level of consciousness, in shock.
This ECG shows wide complex tachycardia with concordant ST elevation in V4-6, due to LAD occlusion. The rhythm was likely sinus tachycardia with RBBB and then LAFB mid way through the trace.