parasystole

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parasystole

 [par″ah-sis´to-le]
a cardiac arrhythmia attributed to the interaction of two foci independently initiating cardiac impulses at different rates; it cannot be discharged by impulses of the dominant rhythm but it may be modulated by electrotonic influences. The two independent rhythms coexist but not as a result of atrioventricular block. It is an abnormality of both automaticity and impulse conduction. See also entrance block.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

par·a·sys·to·le

(par'ă-sis'tō-lē),
A second automatic rhythm existing simultaneously with normal sinus or other dominant rhythm, the parasystolic center being protected from the dominant rhythm's impulses so that its basic rhythm is undisturbed, although it may be manifest in the ECG only at various multiples of its basic periodicity.
Synonym(s): parasystolic beat
[para- + G. systolē, a contracting]
Farlex Partner Medical Dictionary © Farlex 2012

par·a·sys·to·le

(par'ă-sis'tŏ-lē)
A second automatic rhythm existing simultaneously with normal sinus or other dominant rhythm, the parasystolic center being protected from the dominant rhythm's impulses so that its basic rhythm is undisturbed, although it may be manifest in the electrocardiogram only at various multiples of its basic periodicity.
[para- + G. systolē, a contracting]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012