| ventricular e. |
the occurrence of one or more ectopic beats in which a ventricular pacemaker becomes effective before the sinoatrial pacemaker; it usually occurs with slow sinus rates and often, but not necessarily, with increased vagal tone. See also under beat and rhythm.
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| ventricular escape b. |
an ectopic beat of ventricular origin occurring in the absence of supraventricular impulse generation or conduction; it is characterized by a bizarre, usually wide QRS complex and lack of an ectopic P wave.
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| ventricular f. |
arrhythmia characterized by fibrillary contractions of the ventricular muscle due to rapid repetitive excitation of myocardial fibers without coordinated contraction of the ventricle; it is an expression of randomized circus movement or of an ectopic focus with a very rapid cycle. Abbreviated VF or VFib. Click here to view image■Ventricular fibrillation, characterized by irregular undulations without clear ventricular complexes.
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| ventricular filling p. |
see under period.
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| ventricular function c. |
Starling c.
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