What distinguishes sinus tachycardia?

Sinus tachycardia is characterized by a heart rate that exceeds 100 beats per minute but remains below 150 beats per minute. This condition is typically a physiological response to factors such as stress, excitement, fever, or exercise. It occurs when the sinoatrial node, which is the natural pacemaker of the heart, fires at an elevated rate and is usually a normal response to increased demand for blood flow.

Understanding the nuances of heart rate is crucial in differentiating sinus tachycardia from other cardiac conditions. A heart rate below 100 bpm is indicative of normal sinus rhythm, while rates above 100 bpm are classified as tachycardia. The distinction from other types of tachyarrhythmias is important for accurate diagnosis and management, making it essential to understand the correct parameters that define sinus tachycardia.