Sinus Tachycardia

Sinus rhythm at an increased rate.

Programmatically generated teaching example. Morphology and supporting values are simplified.

Typical rate: >100 bpm
Regularity: Regular
P waves: Upright; may merge with preceding T
PR interval: 120–200 ms
QRS: Narrow, <120 ms

Sources and review status

This guide uses RhythmDock’s centralized educational definitions. See reference sources and limitations. Published September 13, 2026. Independent medical review is pending; this is not a clinical interpretation tool.