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Atrial and ventricular-programmed
electrical stimulation studies have been performed in 8 patients with
short QT interval. In one patient, the shortest coupling interval
applied was 180 ms, with ventricular ERP shorter than that, and no
arrhythmias were induced. In the remaining seven patients, ERP was
determined in both the atria and ventricles. In five of these patients,
ERP was found to be between 120 and 160 ms, while atrial fibrillation
was induced in two patients.
AV-node effective refractory period was
determined in two patients and found to be 210 and 440 ms respectively.
Ventricular ERP was remarkably consistent in all 7 patients (130 – 140
ms). Ventricular fibrillation was induced in 5 patients and a
monomorphic VT (CI: 150 ms) in one patient.
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