sinus arrhythmia

Introduction

Variation between the longest & shortest p-wave intervals is > 0.12 seconds. Variation may be phasic with respirations or non phasic. In the phasic variant, the cycle length diminishes with inspiration & increases with expiration. The non phasic variant may be related to variation in vagal tone.

Clinical manifestations

generally asymptomatic

Management

• workup &/or treatment generally unnecessary

More general terms

• supraventricular arrhythmia

Additional terms

• sinus node; sinoatrial node; SA node
• sinus rhythm