As a medical professional with expertise in cardiology, I can provide you with information on what is considered a dangerously high heart rate. In adults, a normal resting heart rate ranges from 60 to 100 beats per minute (BPM). A heart rate that is consistently above 100 BPM is referred to as tachycardia. However, it's important to note that a high heart rate in itself is not always dangerous. It can be a response to physical activity, stress, certain medications, caffeine, or other stimulants. Dangerously high heart rates, also known as supraventricular tachycardia (SVT) or ventricular tachycardia, typically occur suddenly and can be life-threatening. These rates are often above 150 BPM, but the threshold can vary depending on the individual's health status and the presence of underlying heart conditions. In some cases, a heart rate above 100 BPM can be dangerous if it's sustained and not due to temporary factors like exercise. It's crucial to seek immediate medical attention if you experience a dangerously high heart rate accompanied by symptoms such as chest pain, shortness of breath, dizziness, or fainting, as these can be signs of a serious cardiac event. read more >>

A heart rate of more than 100 beats per minute (BPM) in adults is called tachycardia. What's too fast for you may depend on your age and physical condition.read more >>