Cardioversion of atrial fibrillation with ibutilide: when is it most effective?

Background: Atrial fibrillation (AF) is found in 1% of persons above the age of 60 years. More than 5% of the population older than 69 years and about 14% of octogenarians are at risk for this arrhythmia. It is estimated that 1.

Inappropriate mode switching in a dual chamber pacemaker due to oversensing of a high frequency signal from a conductor/ring discontinuity (loose set screw).

Two unusual cases are reported of pacemaker oversensing of the impedance pulse by the atrial channel attributed to a loose set screw.