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.

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]

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]
References in periodicals archive ?
An evaluation of fusion beats in ventricular parasystole. Circulation 1963;27:1061-1070.