A prolonged R–R interval indicates which of the following kinds of cardiac arrhythmia?
a. Atrial fibrillation c. Premature ventricu-lar beats
b. Sinoatrial block d. Paroxysmal atrial tachycardia
ANS: B
Sinoatrial blocks occur when the impulse generated at the sinoatrial node is blocked before it can enter the atrial muscle. On the electrocardiogram this is demonstrated by a sudden loss of P waves resulting from the absence of atrial depolarization. The contour of the QRS complex is normal, but the R–R intervals are usually prolonged, indicating the presence of a junctional es-cape rhythm.
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