AV blocks can be temporary or permanent. Here’s a look at the causes of each kind of AV block. Causes of temporary block - Myocardial infarction (MI), usually inferior wall MI
- Digoxin (Lanoxin) toxicity
- Acute myocarditis
- Calcium channel blockers
- Beta-adrenergic blockers
- Cardiac surgery
Causes of permanent block - Changes associated with aging
- Congenital abnormalities
- MI, usually anteroseptal MI
- Cardiomyopathy
- Cardiac surgery
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