Procedural Safety
There was no significant difference in the number of observed complications between the SDD and ONS cohorts within 30 days after hospital discharge following the cryoballoon ablation (Table 3). Patients who followed a SDD protocol suffered a total of 15 (1.26%) complications while patients who were observed during an ONS had a total of 24 (2.03%) complications observed during the 30 day follow-up (p=0.13) (Figure 1). Hematoma within the immediate post-op period was the most common complication in both groups, which accounted for almost half of the complications in both the SDD and ONS cohorts (0.67% versus 0.93%, respectively). None of the complications in the SDD group occurred during the first 24 hours after discharge from the hospital; therefore, these events would not have been prevented by monitoring during an overnight hospital stay.