A small Q wave (<40-ms duration and <0.5-mV amplitude) in V(2) or V(3) with or without early fragmentation significantly predicted the presence of CAD and, especially, significant stenosis in the LAD.

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We studied the modes of initiation of two types of atria] reentrant tachycardias (i.e., microreentry isthmus tachycardia and counterclockwise atrial flutter) in a 39‐year‐old male with typical atrial flutter. Rapid atrial pacing from proximal coronary sinus at a cycle length of 220 msec initiated micro‐reentry isthmus tachycardia (non‐sustained), while rapid atrial pacing at a cycle length of 210 msec initiated sustained atrial flutter circulating counterclockwise around the tricuspid annulus. It was suggested that initiation of the counterclockwise atrial flutter was associated with a pacing‐induced conduction block in the entire width of the isthmus, whereas initiation of the micro‐reentry isthmus tachycardia was associated with a pacing‐induced conduction block in a limited segment of the isthmus (i.e., partial isthmus block).

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