What is the danger in having a very high resting pulse rate?

A very high resting pulse rate, also known as tachycardia, can be dangerous for several reasons:

1. Increased risk of heart failure: A heart that is beating too fast does not have enough time to fill completely with blood between beats, which can lead to a decrease in the amount of blood pumped out with each beat (stroke volume). This can lead to heart failure, in which the heart is unable to meet the body's demands for blood.

2. Arrhythmia: A high resting pulse rate can increase the risk of developing arrhythmia, which is an abnormal heart rhythm. Some arrhythmias can be very serious and even life-threatening.

3. Increased workload on the heart: A heart that is beating too fast has to work harder to pump the same amount of blood. This can put a strain on the heart muscle and increase the risk of heart problems such as heart attack.

4. Other health problems: A high resting pulse rate can also be associated with other health problems such as thyroid problems, anemia, and infection.

It is important to consult a doctor if you are experiencing a very high resting pulse rate, as it could be a sign of an underlying medical condition that needs to be treated.