Gives rise to the loss of atrial contraction and an irregular ventricular rate.
Clinically recognized by an irregularly irregular heart rate. See ACLS protocols , for acute management of atrial fibrillation with a rapid ventricular response. Generally, verapamil or diltiazem are the drugs of choice. Digoxin is most effective in rate control in those with CHF or at bed rest but may not be sufficient in those who are ambulatory. Additionally, it may increase incidence of A Fib in those with paroxysmal A Fib.