Lev's disease is most commonly seen in the elderly, and is often described as senile degeneration of the conduction system.

The attacks are caused by lack of cardiac output due to antimony poisoning, cardiac asystole, heart block, Lev's disease or ventricular fibrillation.

Lev's disease (or Lenegre-Lev syndrome) is an acquired complete heart block due to idiopathic fibrosis and calcification of the electrical conduction system of the heart.

Lev's disease (or Lenegre-Lev syndrome) is an acquired complete heart block due to idiopathic fibrosis and calcification of the electrical conduction system of the heart.