Which set of rate ranges corresponds to junctional rhythm, accelerated junctional rhythm, and junctional tachycardia?

Which set of rate ranges corresponds to junctional rhythm, accelerated junctional rhythm, and junctional tachycardia?

• A. 40-60 bpm for junctional rhythm; 60-100 bpm accelerated; >100 bpm junctional tachycardia
• B. 60-100 bpm for junctional rhythm; 40-60 bpm accelerated; >100 bpm tachycardia
• C. 55-75 bpm for junctional rhythm; 75-120 bpm accelerated; 120-180 tachycardia
• D. 40-60 bpm for junctional rhythm; 60-100 bpm accelerated; >100 bpm junctional tachycardia

Answer: (D)

Junctional rhythms come from the AV node, so their rate is defined by how fast the AV junction fires. When the rhythm is coming from the AV junction at a rate of 40–60 beats per minute, that’s considered a junctional rhythm. If the AV junction fires faster, in the 60–100 bpm range, that’s an accelerated junctional rhythm. When the rate exceeds 100 bpm, it’s labeled junctional tachycardia. These thresholds separate the slower junctional pacing from a tachycardic pace originating in the AV junction. In ECGs you’d also expect narrow QRS complexes with P waves that may be inverted or absent due to retrograde atrial conduction, but the key for classification is the rate: 40–60 for junctional rhythm, 60–100 for accelerated, and over 100 for junctional tachycardia. This is why the set with those ranges is the best match.

Junctional rhythms come from the AV node, so their rate is defined by how fast the AV junction fires. When the rhythm is coming from the AV junction at a rate of 40–60 beats per minute, that’s considered a junctional rhythm. If the AV junction fires faster, in the 60–100 bpm range, that’s an accelerated junctional rhythm. When the rate exceeds 100 bpm, it’s labeled junctional tachycardia. These thresholds separate the slower junctional pacing from a tachycardic pace originating in the AV junction. In ECGs you’d also expect narrow QRS complexes with P waves that may be inverted or absent due to retrograde atrial conduction, but the key for classification is the rate: 40–60 for junctional rhythm, 60–100 for accelerated, and over 100 for junctional tachycardia. This is why the set with those ranges is the best match.