Permanent cardiac pacing for patients with iatrogenic or potentially reversible bradyarrhythmia.

INTRODUCTION: In iatrogenic or potentially reversible bradyarrhythmia, drug discontinuation or metabolic correction is recommended before permanent cardiac pacemaker (PM) implantation. These patients often have conduction system disease and there are few data on recurrence or the need for a permanent PM.

OBJECTIVE: To analyze the need for PM implantation in patients with iatrogenic bradyarrhythmia or bradyarrhythmia associated with other potentially reversible causes.

METHODS: We assessed consecutive symptomatic patients admitted to the emergency department with a primary diagnosis of bradyarrhythmia (atrioventricular [AV] node disease - complete or second-degree AV block (AVB) [CAVB: 2nd-degree AVB - 2:1], sinus bradycardia [SB] and atrial fibrillation [AF] with slow ventricular response [SVR]) in the context of iatrogenic causes or metabolic abnormalities. We determined the percentage of patients who required PM implantation.

RESULTS: We studied 153 patients (47% male) admitted for iatrogenic or potentially reversible bradyarrhythmia. Diagnoses were SB 16%, CAVB 63%, second-degree AVB 12%, and AF with SVR 10%. Eighty-five percent of patients were under negative chronotropic therapy, 3% had hyperkalemia and 12% had a combined etiology. After correction of the cause, 55% of patients (n=84) needed a PM. In these patients the most common type of bradyarrhythmia was CAVB, in 77% (n=65) patients.

CONCLUSION: In a high percentage of patients with bradyarrhythmia associated with a potentially reversible cause, the arrhythmia recurs or does not resolve during follow-up. Patients with AV node disease constitute a subgroup with a higher risk of recurrence who require greater vigilance during follow-up and should be considered for PM implantation after the first episode.