What heart rate is typically associated with sinus tachycardia?

Sinus tachycardia is defined as a heart rate that exceeds the normal range of resting heart rates. Typically, a normal resting heart rate for adults is between 60 to 100 beats per minute. When the heart rate exceeds 100 beats per minute, it indicates that the body may be responding to a physiological stimulus such as stress, exercise, pain, anxiety, or various medical conditions.

In sinus tachycardia, the rhythm remains regular, and each QRS complex is preceded by a P wave that originates from the sinus node. This distinguishes it from other tachyarrhythmias, which may have more irregular patterns or other underlying causes. The key characteristic is the elevated heart rate, signaling an increased demand or response from the body, making greater than 100 beats per minute the defining threshold for this condition.

This makes the rationale for identifying heart rates above this threshold as part of sinus tachycardia clear, linking the clinical condition with the physiological implications of an accelerated heart rate.