Question

Based on the provided ECG description (Accelerated Junctional Rhythm), which of the following statements is correct?

A) The P wave is absent, and there are no QRS complexes following the P waves, indicating a regular rhythm at 70 beats per minute due to an accelerated junctional rhythm with narrow complexes.

B) Both P waves and QRS complexes are absent, indicating a complete heart block and a regular rhythm at 70 beats per minute.

C) The P wave is present, and there are narrow QRS complexes following the P waves, indicating a regular rhythm at 70 beats per minute with an accelerated atrial rate.

D) The P wave is present, but there are wide QRS complexes, indicating an irregular rhythm at 70 beats per minute with premature ventricular contractions.

Answer 1

The correct statement for the ECG description of an Accelerated Junctional Rhythm is A), with absent P waves and regular narrow QRS complexes at a rate of 70 beats per minute, indicating an origin of the rhythm from the AV node or near the junctional region.

Step-by-step explanation:

Based on the provided ECG description of Accelerated Junctional Rhythm, the correct answer is A) The P wave is absent, and there are no QRS complexes following the P waves, indicating a regular rhythm at 70 beats per minute due to an accelerated junctional rhythm with narrow complexes. In accelerated junctional rhythm, the rhythm originates from the AV node or near the junctional region instead of the SA node, leading to absent or inverted P waves that may appear before, during, or after the QRS complexes.

It's important to differentiate between the types of AV block and accelerated junctional rhythm. In a third-degree block, there is no correlation between atrial activity (the P wave) and ventricular activity (the QRS complex), whereas an accelerated junctional rhythm can have a normal rate or slightly faster but typically maintains regularity, as in this case.