What heart rate defines tachycardia?

Tachycardia is defined as a heart rate that exceeds the normal resting rate, which for adults is typically between 60 and 100 beats per minute (bpm). A heart rate above 100 bpm indicates that the heart is beating more rapidly than what is considered normal, thus classifying it as tachycardia. This elevated heart rate can be a physiological response to various factors such as exercise, stress, or medical conditions and can indicate underlying health issues if persistent. Understanding this definition is crucial for assessing patient conditions in medical training and practice, as it helps in identifying potential cardiovascular concerns.