Pathological long duration of QTc and JTc intervals is non-questionable factor of sudden death. Information of the investigation of electrocardiogram increases during physical exercise test or transesophageal pacing of the left atrium.
Objective: The search of the factors of sudden death in hypertrophic cardiomyopathy and arterial hypertension patients and healthy persons from their electrocardiographic changes of JTc interval applying transesophageal pacing of the left atrium.
Material and methods: It was done transesophageal pacing to 12 healthy persons, 12 arterial hypertension and 13 hypertrophic cardiomyopathy patients. Pacing rates of 80, 100 and 130 bpm were applied for 3 min each.
Results: There was no prolongation of JTc in control group. JTc prolongation (more than 0.35 s) appeared in 3 arterial hypertension patients and 3 hypertrophic cardiomyopathy patients. Five hypertrophic cardiomyopathy patients and one arterial hypertension patient had prolonged JTc interval at the rest electrocardiogram.
Conclusions: Transesophageal pacing of the left atrium helped to detect pathological long JTc interval in arterial hypertension and hypertrophic cardiomyopathy patients, when JTc interval was not prolonged at the rest electrocardiogram.