Heart Rate in AVNRT
The typical heart rate in AVNRT is 180-200 bpm, with a range of 110 to >250 bpm 1.
Typical Rate Range
According to the 2015 ACC/AHA/HRS guidelines, AVNRT presents with a ventricular rate that is "often 180 bpm to 200 bpm" but demonstrates considerable variability, ranging from 110 bpm to greater than 250 bpm 1. This establishes the expected heart rate window you should anticipate when evaluating a patient with suspected AVNRT.
Important Caveats
Rare Slow Forms Exist
While most AVNRT presents with rates well above 150 bpm, in rare cases the rate can be <100 bpm 1. These atypical slow forms of atrioventricular nodal reentrant arrhythmia (AVNRA) can occur with cycle lengths greater than 600 ms (rates <100 bpm), particularly in elderly patients 2. One study of slow AVNRA found mean tachycardia cycle lengths of 668 ± 74 ms (approximately 90 bpm) in patients with a mean age of 77 years 2.
Clinical Recognition Points
- Rates around 150 bpm can be diagnostically challenging 3, as this overlaps with sinus tachycardia, atrial flutter, and other SVTs
- The presence of regular "cannon A waves" in the neck strongly favors AVNRT over other narrow complex tachycardias, as atrial and ventricular contractions occur nearly simultaneously 3
- Patients with relatively slower AVNRT (cycle length >400 ms) tend to be older, more often male, and have different electrophysiologic characteristics compared to faster forms 4
Pitfall to Avoid
Do not dismiss slow regular narrow complex tachycardia <100 bpm as simply "junctional rhythm" in elderly patients—this may represent slow AVNRA that can cause significant symptoms (dyspnea, chest tightness, near-syncope, syncope) and is amenable to successful catheter ablation 2.
The wide rate variability in AVNRT means you should maintain diagnostic suspicion across a broad heart rate spectrum, though the 180-200 bpm range remains most typical.