3.3 | Adverse events
We observed a small, clinically non-relevant pericardial effusion in three patients (16%) on transthoracic echocardiography the day after the procedure, all of which resolved without additional interventions. One additional patient (5%) complained about symptoms compatible with mild pericarditis. In one patient (5%), a dual chamber pacemaker was implanted the day following the procedure because of symptomatic sinus arrest. Two VOMs were present in one patient (Figure 7). Cannulation of the smaller VOM resulted in uneventful dissection and VOM-EI of the larger VOM was successful. In another patient, a VOM with a normal diameter dissected during cannulation. Repeat cannulation of the VOM and VOM-EI was successful without any complications at the end of the ablation procedure.