[Characteristics of arrhythmia and late ventricular potentials in patients with cardiological syndrome X]. / Kharakteristika narushenii serdechnogo ritma i pozdnie potentsialy zheludochkov u bol'nykh s kardiologicheskim sindromom X.

AIM: A comparative study of late ventricular potentials (LVP) in patients with cardiological syndrome X (SX) and stenotic atherosclerosis of coronary arteries (ACA) as well as their relations with arrhythmia, cardiac contractility, lipid metabolism and morphological characteristics of the myocardium. MATERIAL AND METHODS: The examination of 52 SX and 77 ACA patients as well as 17 healthy subjects included coronaroventriculography, bicycle exercise, 24-h ECG monitoring, echocardiography, signal-averaged high-resolution (SAHR) ECG, investigation of blood lipoproteins. Endomyocardial biopsy was made in 5 ACA and 5 SX patients. RESULTS: No differences were registered between SX and ACA patients by frequency and severity of arrhythmic episodes, percentage of patients with registered LVP, quantitative parameters of SAHR ECG. Frequency of high-gradation ventricular arrhythmia episodes was significantly higher in SX and ACA patients with LVP than such patients free of LVP. SX patients had correlation between parameters of SAHR ECG, myocardial contractility and lipid metabolism. Foci of diffuse cardiosclerosis are most probable anatomic substrate of LVP. CONCLUSION: The risk of prognostically unfavourable high-gradation ventricular arrhythmia episodes in SX and ACA patients is the same. LVP may predict severe ventricular arrhythmia episodes both in SX and ACA patients.