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Figure 5 Recordings from case 24 showing induction of a nonsustained atypical atrioventricular node reentry tachycardia. The tachycardia was induced by a ventricular extrastimulus, which was coupled to a ventricular driven cycle length of 480 ms at a coupling interval of 240 ms. At the beginning, the tachycardia appeared to be of the fast-intermediate form with an AH of 150 ms and HA of 150 ms. A progressive shortening of the HA interval (from 150 to –10 ms) and a progressive lengthening of the AH interval (from 150 to 350 ms) concomitant with a lengthening of the tachycardia cycle length (from 300 to 340 ms) were observed. The AH/HA ratio was reversed before termination of the tachycardia. Note that the atrial activation of the last beat was registered before the His bundle potential.
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