[Arrhythmias and heart blocks in flying personnel with mitral valve prolapses].
Investigated were 76 pilots with ECG-verified mitral valve prolapses (MVP) of the 1st and 2nd degree (w/o profound regurgitation). There were various heart blocks and ECG repolarization changes in 35 cases. Comparison of results of the cardiovascular functional investigations of flyers with MVP displayed non-specific cardiac rhythm and conductance disturbances that were registered more often during ECG-monitoring or test loading. According to the data of this study, bicycle and treadmill ergometry revealed "pseudoischemic" shifts in ECG. Literary indications of a significant loss in human endurance of physical loads due to MVP combined with the strain-induced arrhythmia received the experimental confirmation. Probably, arrhythmias in flyers with diagnosed MVP are predominantly associated with electric instability of the myocardium against the autonomous dysfunction with prevailing adrenergic effects.
D000328:Adult; D000337:Aerospace Medicine; D001145:Arrhythmias, Cardiac / Q000175:diagnosis / Q000209:etiology* / Q000503:physiopathology; D004452:Echocardiography; D004562:Electrocardiography; D005080:Exercise Test; D006327:Heart Block / Q000175:diagnosis / Q000209:etiology / Q000503:physiopathology; D006339:Heart Rate; D006801:Humans; D008875:Middle Aged; D008945:Mitral Valve Prolapse / Q000150:complications* / Q000000981:diagnostic imaging; D011379:Prognosis