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- W4205804514 abstract "The incidence of parasystole is approximately 0.13 per cent of all electrocardiograms taken in a general hospital and is seen twice as frequently in males. In the majority of the cases studied with parasystole there was demonstrated some form of heart disease and 65 per cent of the patients were older than 60 years of age. The most commonly associated heart diseases were arteriosclerotic heart disease and/or hypertensive cardiovascular disease (60 per cent) and half of these subjects had congestive heart failure. Various other acquired and congenital heart diseases were also associated with this arrhythmia but 14 per cent failed to show any evidence of heart disease. Ordinary premature beats (extrasystoles) may be confused with parasystole in certain cases, but parasystole is distinguished by varying coupling intervals, constant shortest interectopic intervals and the frequent appearance of fusion beats. Atrial dissociation was distinguished from atrial parasystole by lack of conduction of the ectopic impulse to the ventricle, small aberrant P waves or fibrillatory waves, more variable interectopic interval and the constant association of very advanced cardiac disease. Parasystole is usually present transiently but it may persist for many months or years. The parasystolic rate may range between 20 and 400 per minute but a low rate (between 20 and 50 per minute) is much more common. A parasystolic center may produce tachycardia but it is almost always ventricular in origin. It is of interest that on the average, the rate of ventricular parasystolic tachycardia are slower than those of paroxysmal ventricular tachycardia without the parasystolic mechanism. Carotid sinus stimulation may slow, provoke or even abolish ventricular parasystole, and occasionally atrial or A-V nodal parasystole. Exercise produces a similar effect. There seems to be no direct relationship between digitalis and parasystole although in many cases parasystole may disappear after digitalization for congestive heart failure as the cardiac status improves. Quinidine or pronestyl has been successfully used to terminate the arrhythmia when there are significant symptoms present such as palpitation and skipping heart beat due to the arrhythmia itself. Several rare incidences of multifocal parasystole were described. The prognosis of individuals with arrhythmia is influenced by the presence, absence or status of the underlying heart disease. However, any patient with heart disease should be carefully observed when the arrhythmia develops since these patients, not infrequently, expire within a few weeks or months following the development of this highly interesting arrhythmia." @default.
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- W4205804514 date "1968-07-01" @default.
- W4205804514 modified "2023-10-16" @default.
- W4205804514 title "Parasystole" @default.
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- W4205804514 doi "https://doi.org/10.1016/s0033-0620(68)80012-x" @default.
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