The atrial kick becomes important to ventricular filling during which of the following?
a. Atrial flutter c. Ventricular asystole
b. Atrial fibrillation d. Ventricular tachy-cardia
ANS: D
The atrial kick occurs just before the beginning of ventricular systole. Contraction of the atria normally contributes only a small amount of blood to ventricular filling. However, it can contrib-ute a significant amount of blood to ventricular filling if the heart rate is increased and the period of diastasis is reduced. This occurs during ventricular tachycardia, because the higher heart rate results in a reduction in the volume of blood that passively enters the ventricle during atrial dias-tole.
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