Ideal Rest Heart Rate in Atrial Fibrillation

Evidence Supporting Lenient Rate Control

The European Society of Cardiology recommends a lenient heart rate target of less than 110 beats per minute at rest for most patients with atrial fibrillation, with stricter control reserved for those who remain symptomatic despite lenient control 1
The RACE II trial found no difference in composite clinical events (14.9% strict control vs 12.9% lenient control) in 614 patients with permanent AF, supporting lenient rate control as non-inferior to strict control 1
Lenient control is acceptable regardless of heart failure status, unless symptoms dictate otherwise, as shown in the RACE II trial 1
A pooled analysis of AFFIRM and RACE trials involving 1,091 participants corroborated the finding that lenient rate control is non-inferior to strict control 1

The American Heart Association suggests targeting a resting heart rate of less than 110 beats per minute for most patients with atrial fibrillation, with stricter targets (less than 80 bpm) reserved for symptomatic patients or those with suspicion of tachycardia-induced cardiomyopathy 1
During moderate exercise, the target heart rate should be 90-115 bpm, as recommended by the European Society of Cardiology 2

The European Society of Cardiology recommends using 24-hour Holter monitoring or exercise testing to evaluate true rate control, rather than relying solely on resting ECG 2
Resting heart rate alone is insufficient to judge adequacy of rate control, and exercise testing reveals whether rates remain physiologic during activity 2

For patients with left ventricular ejection fraction (LVEF) ≥40%, beta-blockers, diltiazem, verapamil, or digoxin are appropriate first-line options for rate control, as recommended by the European Society of Cardiology 1
For patients with LVEF <40%, beta-blockers and/or digoxin should be used, and non-dihydropyridine calcium channel blockers (diltiazem, verapamil) should be avoided 1

Digoxin is not recommended as monotherapy for rate control in active patients, but remains useful in combination with other agents, for sedentary patients, or in heart failure with reduced ejection fraction 1
The RACE II trial changed practice by demonstrating that a strict target of 60-80 bpm at rest offers no clinical benefit over less than 110 bpm for most patients, but criteria may vary with patient age 1

The American College of Cardiology recommends a target heart rate of 60-80 beats per minute at rest for patients with well-controlled atrial fibrillation, with a rate of 90-115 beats per minute during moderate exercise 3, 4, 5, 6, 7

The ACC/AHA/HRS guidelines establish specific targets based on the AFFIRM and RACE trials, with a strict target of ≤80 beats per minute at rest and a permissive target of <100 beats per minute at rest 3, 4, 5, 6, 7
The optimal usual range for heart rate control is 60-80 beats per minute at rest 3, 4, 5, 6, 7
During moderate exercise, the target heart rate is 90-115 beats per minute 3, 4, 5, 6, 7

The American College of Cardiology recommends measuring heart rate at rest as a basic obligatory evaluation, with a test of effort for symptomatic patients during activity to adjust treatment and maintain heart rate within the physiological range 3, 7
A 24-hour Holter monitor is useful for evaluating the response over a prolonged period 3, 4, 5, 6, 7

Inadequate heart rate control can lead to tachycardia-induced cardiomyopathy, with a sustained uncontrolled tachycardia causing deterioration of ventricular function 3, 4, 5, 6, 7
After adequate heart rate control, 25% of patients with an ejection fraction <45% show an improvement >15% 3, 4, 5, 6
Cardiomyopathy generally resolves within 6 months following adequate heart rate control 3, 4, 5, 6