What is a likely heart rate range with AFib?

Question

74 year old- history of CAD with CABG, poor circulation in legs.  Apple Watch says a fib with heart rate of 60

Answer 1

Atrial fibrillation is an irregular and often rapid heart rate that occurs when the two upper chambers of your heart experience chaotic electrical signals. The result is a fast and irregular heart rhythm. The heart rate in atrial fibrillation may range from 100 to 175 beats a minute. The normal range for a heart rate is 60 to 100 beats a minute. But atrial fibrillation can also have a heart rate of 60 beats per minute. You need a dynamic electrocardiogram to confirm the diagnosis.

Answer 2

A simple heart rate is useless for determining whether it is atrial fibrillation or not. Although in most cases, people with afib have a rapid heart rate (>100 beats per minute), many people with afib have a perfectly normal heart rate (60-100 beats per minute). In fact, a more useful indicator of afib is the variation of heart rate. For example, your heart rate changes from 60 to 90 rapidly. That is to say, changes in heart rate is more suggestive of afib than a simple heart rate value.