Normal Sinus Rhythm

A regular rhythm originating in the sinus node.

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

Typical rate: 60–100 bpm
Regularity: Regular
P waves: Upright; one before each QRS
PR interval: 120–200 ms; constant
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.