A first degree block is caused by ________________. A. delay of the action poten

Question

A first degree block is caused by ________________.

A. delay of the action potential between the SA and AV nodes

B. delay of the action potential between the AV node and Purkinje fibers

C. delay of the action potential between the SA node and Purkinje fibers

D. delay of the action potential between the AV and SA nodes

The rate of ventricular conduction is best determined by the _______________________ on an ECG.

A. the number of T waves present within a specific unit of time

B. the number of P waves present within a specific unit of time

C. the number of QRS complexes present within a specific unit of time

An ECG tracing from someone with a third-degree AV block is best described as a tracing with a

A. 1:1 ratio of P waves to QRS complexes

B. 1:2 ratio of P waves to QRS complexes

C. 1:1 ratio of T waves to QRS complexes

D. 2:1 ratio of P waves to QRS complexes

Explanation / Answer

First degree heart block is caused by :-

A) delay of the action potential between SA nodes and AV nodes. (It is not that much a serious condition, and can occur due to electrolyte disturbances or even due to effects of some medications).

The rate of ventricular conduction is best determined by the :-

C) number of QRS complexes present within a specific unit of time

on an ECG

ECG tracing from someone with a third-degree AV block is best described as a tracing with a :-

C) 1:1 ratio of T waves to QRS complexes. (P waves are completely unrelated to QRS complexes here, as all P waves are blocked from reaching ventricles to AV node)

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