title: [Differential diagnosis of linked parasystole and extrasystole].
abstract: The differentiation between linked parasystole and extrasystole was based on functional tests with exercise and atropin as stimuli. A total of 116 patients (71 with parasystole and 45 with extrasystole) were investigated. Two mechanisms involved in parasystole with fixed links between ectopic complexes were identified: 1) a mechanism of simple quantitative correlation between two pace-makers, 2) a mechanism of the principal pace-maker being discharged with impulses from the parasystolic one. Extrasystole is based on the trigger mechanism of relationship between ectopic excitation and the impulse from the principal pace-maker. Prolonged ECG recording established limits for the maximum interval of links between monotopic extrasystoles and the interectopic interval for paired extrasystole. Extrasystole was shown to be incapable of generating a pace of its own, i.e. a succession of three or more ectopic complexes of similar morphology.
mesh_terms: D001145:Arrhythmias, Cardiac / Q000175:diagnosis* / Q000503:physiopathology; D001285:Atropine; D005117:Cardiac Complexes, Premature / Q000175:diagnosis* / Q000503:physiopathology; D003937:Diagnosis, Differential; D004562:Electrocardiography; D005080:Exercise Test; D006329:Heart Conduction System / Q000503:physiopathology; D006801:Humans
chemical_list: D001285:Atropine
vernacular_title: Differentsial'naia diagnostika parasistolii stseplennogo tipa i ékstrasistolii.