Bradyarrhythmias

Sinus Brady

• common complication of MI
• discontinue offending meds
• treat hypothermia, electrolyte imbalances
• if symptomatic, may require pacemaker
• can be complicated by torsades

Sick Sinus Syndrome

• most common indication for pacemaker placement

1st degree AV block

• prolonged PR interval (> 200 msec)
• can treat with atropine or dopamine

2nd degree AV block (Mobitz 1)

• gradually lengthening PR interval, followed by a dropped beat and resetting of the PR interval

2nd degree AV block (Mobitz 2)

• dropped beats without preceding PR interval prolongation
• frequently progresses to 3rd degree AV block
• requires pacemaker placement

3rd degree AV block

• complete heart block, atrial and ventricle rhythms no longer connected
• common complication of MI
• requires pacemaker placement