The heart block that causes "dropped" beats and that is often the result of increased parasympa-thetic tone is called _____ block
a. Sinoatrial c. First-degree atrio-ventricular
b. Mobitz type I d. Left bundle branch
ANS: B
Dropped beats are characteristic of second-degree atrioventricular blocks, which consist of Mo-bitz type I and Mobitz type II blocks. These dropped beats are a result of the atrioventricular node's inability to conduct impulses from the sinoatrial node. Sinoatrial blocks are indicated by a sudden loss of P waves. First-degree atrioventricular blocks are indicated by a prolongation of the P–R interval. Left bundle branch blocks are indicated by the absence of Q waves in the left limb leads.
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