2nd Degree Block (M1)

Characterized by gradually increasing block at the AV node due to prolongation of the AV-nodal refractory period; can occur in normal hearts


ECG Findings

Acute Treatment

  1. General measures
  2. If patient is symptomatic
Treatment Comment
Atropine 0.5 mg IV, may repeat every 5 min until desired effect or until the total dose reaches 2.0 mg  
Second-line, if atropine unsuccessful:
Transcutaneous Cardiac Pacing Confirm that hypoperfusion is due to the rate and not to decreased preload, as in inferior myocardial infarction.


  1. Admit
  2. Discharge

Further Management

  1. Tx underlying conditions as appropriate
  2. Diagnostic testing
  3. Permanent pacemaker
  4. Follow Up Care