title: [Mechanism of the occurrence of ventricular bigeminy].
abstract: Twenty-seven patients, aged 15 to 77, with a variety of cardiovascular diseases and bigeminy, and 3 normal subjects were investigated, using exercise and atropin tests. Electrocardiograms were recorded at pre-ectopic intervals of no more than 0.55 sec in bigeminy and polygeminy. The common divisor for interectopic intervals, ectopic complex interpolation, P-Q and Q-T intervals of the main complex and the presence of a wave on the ascending or descending slope of the R wave in sinus QRS complex were determined. Three mechanisms were identified to explain ventricular bigeminy developing during the third phase of action potential and the supernormal myocardial excitation period. A risk group was identified with respect to persistent bigeminy, incorporating patients with the short P-Q syndrome and signs of the typical or atypical Wolff-Parkinson-White syndrome.
mesh_terms: D000200:Action Potentials; D000293:Adolescent; D000328:Adult; D000368:Aged; D005117:Cardiac Complexes, Premature / Q000209:etiology* / Q000503:physiopathology; D004562:Electrocardiography; D006352:Heart Ventricles / Q000503:physiopathology; D006801:Humans; D008875:Middle Aged; D011674:Pulse; D013997:Time Factors
vernacular_title: K mekhanizmu vozniknoveniia zheludochkovoĭ bigeminii.