We studied 173 patients with the metabolic syndrome (MS) with an average age of 60 years. Fifty-seven percent were males and 43 percent were females. The mean blood glucose in the MS group was 169 mg%; 97% were diabetic type 2 and 3% were diabetic type 1. The mean body mass was 30 kg/m2. The Q-T interval was measured by standard techniques and corrected by linear correction formula. Q-TC dispersion (QTCD) calculated from the difference between QTCmax and QTC min was 98 ± 4 ms in the MS group and 45 ± 15 ms in the control group (p < .001). A higher incidence of atrial fibrillation was found in the MS group (12% in MS vs 5.9% in controls, p < .001). Ventricular arrhythmias were not observed in the MS group, and the ejection fraction was subnormal (p < .001) when compared with the control group (50 ± 8% vs 62 ± 12%, respectively). These results agree with the observation by Larroude (J Heart Rhythm 2006;3:660-4) regarding Q-T dynamics and variability in paroxysmal atrial fibrillation.
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