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Second Degree AV Block with 2:1 conduction is a special case of second degree AV block with each alternative P wave NOT paired with a QRS complex. The PR interval remains constant. This rhythm requires close monitoring due to risks of: 1) low cardiac output associated with a slow heart rate; and 2) the potential to progress to third degree AV block.
2° AVB 21.mp4DIAGNOSIS
DIAGNOSIS
Possible causes: Fixed ratio blocks can result from either Mobitz I or Mobitz II conduction patterns.
TREATMENT
TREATMENT
Mobitz I: Asymptomatic cases may not need treatment; symptomatic cases follow Mobitz I management.
Mobitz II: A permanent pacemaker is recommended due to a high risk of progressing to complete heart block.
Temporary pacemaker: Used in emergencies with hemodynamic instability before placing a permanent one.
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