The lead is composed of an electrode(s) positioned within a cardiac chamber, an insulated, coiled wire(s), and a connector ... Single-chamber atrial pacing usually employs a lead placed in ...

Patients requiring a pacemaker often have atrial fibrillation (AF), which increases the risk of thromboembolism and, consequently, the risk of morbidity and mortality. To maintain sinus rhythms ...

The AV nodal branch was selected with a 0.014-inch guide wire, over which a ... measurements were obtained, atrial fibrillation was induced by burst atrial pacing from a cycle length of 180 ...

During atrial overdrive pacing at a cycle length of 420 ms, the following EKG was recorded (Fig. 1). What is the mechanism for the progressive widening of QRS complexes and for the normal narrow ...