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Figure 4 Wilson leads V1 and V5 for "W" (activation sequences during normal atrioventricular [AV] conduction) and "A" (activation sequences during adenosine-induced AV block) morphology in patients 3 (upper panel) and 5 (lower panel). The first 90 ms (patient 3) and 60 ms (patient 5) of ventricular depolarization are marked with bold lines. Note that these initial depolarization upstrokes remain almost unchanged after adenosine administration in contrast to the remaining QRS and T-wave morphology.
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