Sinus Bradycardia

Rate	40-59 bpm
P wave	sinus
QRS	normal (.06-.12)
Conduction	P-R normal or slightly prolonged at slower rates
Rhythm	regular or slightly irregular

This rhythm is often seen as a normal variation in athletes, during sleep, or in response to a vagal maneuver. If the bradycardia becomes slower than the SA node pacemaker, a junctional rhythm may occur.

Treatment includes:

treat the underlying cause,
atropine,
isuprel, or
artificial pacing if patient is hemodynamically compromised.

Instant Feedback:

Sinus bradycardia is always abnormal and must be treated.