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[QRST isointegral maps on exercise in patients with congenital long QT syndrome].

UNLABELLED
To clarify the influence of exercise on ventricular repolarization abnormality, QRST isointegral maps (I-map) were analyzed in long QT syndrome (LQTS). The subjects were six LQTS patients. Body surface mapping data were sampled immediately and six min after exercise and at rest. At rest, three patients had a multipolar pattern (MP) in I-map and one patient had a larger negative area (LNA) extending beyond the mid-sternal line. After the handgrip exercise, two patients had a MP and two patients had a LNA. After the ergometer exercise, all five patients had a MP and three of five patients had a LNA.


CONCLUSION
On exercise, abnormal findings were more frequent than those at rest. It showed greater dispersion of ventricular repolarization on exercise in patients with LQTS.