Understanding Sinus Tachycardia

Sinus tachycardia is defined as a heart rate exceeding 100 beats per minute originating from the sinoatrial node. It can be a normal physiological response to stress or exertion, but also indicates serious underlying conditions. Common causes include hypoxia, hemorrhage, and infections that elevate tissue oxygen demand, along with medication effects or withdrawal states. The distinction between normal and inappropriate sinus tachycardia is important, as the former often resolves with treatment of the cause, while the latter may indicate a chronic condition requiring different management.