Figure 1:
Left panel: Surface ECG leads I, II and V1. Coronary sinus electrograms proximal to distal and right ventricular lead electrograms. Digital calipers denote time from pacing spike to latest activation point illustrated inn right panel. Right panel: Local activation time map of the right atrium during pacing from the proximal coronary sinus. The left atrium geometry is rendered for illustration. SVC denotes superior vena cava; IVC denotes inferior vena cava. Latest activation time at the RACT is 86msec.