Tachycardia, Sinus

**Definition:** Simple rapid heartbeats caused by rapid discharge of impulses from the SINOATRIAL NODE, usually between 100 and 180 beats/min in adults. It is characterized by a gradual onset and termination. Sinus tachycardia is common in infants, young children, and adults during strenuous physical activities.

**Tree numbers:** - C14.280.067.845.880.845 - C14.280.123.875.880.845 - C23.550.073.845.880.845

**Synonyms:** - Sinus Tachycardia