Sinus tachycardia:

Question

Sinus tachycardia:

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Sinus tachycardia is a condition where the heart rate is elevated beyond the normal resting rate but typically does not exceed 100-150 beats per minute. It is not characterized by a rate greater than 150 beats per minute (that would be more indicative of other forms of tachycardia), nor does it arise from the ventricles or is brought about by an ectopic pacemaker. Instead, it originates from the sinoatrial (SA) node, which is the natural pacemaker of the heart. The increase in heart rate is often a physiological response to the need for increased cardiac output, such as during exercise or as a response to stress, and is mediated by the sympathetic nervous system.

Sinus Tachycardia