Procedural details and complications stratified by BMI category
| All (N=3333) | Normal BMI (BMI<25.0), n=728 | Overweight (BMI 25.0–29.9), n=1537 | P-value (overweight vs normal) | Obese (BMI ≥30.0), n=1068 | P-value (obese vs normal) | |
| First procedure | 2608/3332 (78.3%) | 584/728 (80.2%) | 1182/1536 (77.0%) | – | 842/1068 (78.8%) | – |
| Procedure duration (min) | ||||||
| N | 3139 | 682 | 1441 | 0.232 | 1016 | <0.001* |
| Mean (±SD) | 164.4 (65.3) | 159.4 (65.6) | 163.2 (64.9) | 169.7 (65.2) | ||
| Radiation dose (mGy) | ||||||
| N | 832 | 177 | 406 | 0.002* | 249 | <0.001* |
| Mean (±SD) | 786.1 (1595.6) | 768.8 (2836.7) | 755.4 (1109.2) | 848.5 (897.7) | ||
| Ablation strategy in paroxysmal AF (%) | ||||||
| Roof line | 105/258 (40.7) | 22/67 (32.8) | 53/120 (44.2) | 0.13 | 30/71 (42.3) | 0.254 |
| Mitral isthmus line | 34/197 (17.3) | 6/1/1950 (12) | 19/92 (20.7) | 0.196 | 9/55 | 0.523 |
| Posterior line | 14/17 (82.4) | 1/2 (50) | 7/9 (77.8) | 0.491 | 6/6 (100) | 0.25 |
| LA CFAE | 123/2238 (5.5) | 24/509 (4.7) | 70/1061 (6.6) | 0.141 | 29/668 (4.3) | 0.759 |
| RA CFAE | 46/2238 (2.1) | 10/509 (2.0) | 26/1061 (2.5) | 0.547 | 10/668 (1.5) | 0.539 |
| Complications (%) | ||||||
| Groin haematoma (requiring intervention/transfusion) | 10/3353 (0.3) | 4/731 (0.5) | 3/1545 (0.2) | 0.221 | 3/1077 (0.3) | 0.45 |
| Pseudoaneurysm | 15/3352 (0.4) | 2/730 (0.3) | 6/1545 (0.4) | 1 | 7/1077 (0.6) | 0.327 |
| Pericarditis | 25/3349 (0.7) | 8/728 (1.1) | 9/1546 (0.6) | 0.182 | 8/1075 (0.7) | 0.431 |
| Cardiac perforation | 47/3348 (1.4) | 7/728 (1.0) | 21/1546 (1.4) | 0.423 | 19/1074 (1.8) | 0.158 |
| Atypical atrial flutter | 7/3349 (0.2) | 0/728 (0.0) | 3/1546 (0.2) | 0.556 | 4/1074 (0.4) | 0.153 |
| MI | 0/3348 (0.0) | 0/728 (0.0) | 0/1546 (0.0) | – | 0/1078 (0.0) | – |
| Stroke | 2/3356 (0.1) | 1/732 (0.1) | 1/1546 (0.1) | 0.54 | 0/1078 (0.0) | 0.404 |
| TIA | 9/3356 (0.3) | 2/732 (0.3) | 3/1546 (0.2) | 0.659 | 4/1078 (0.4) | 1 |
| Phrenic nerve palsy | 12/3356 (0.4) | 2/732 (0.3) | 6/1546 (0.4) | 1 | 4/1078 (0.4) | 1 |
| Atrioesophageal fistula | 2/3356 (0.1) | 0/732 (0.0) | 0/1546 (0.0) | – | 2/1078 (0.2) | 0.518 |
*P<0.05.
AF, atrial fibrillation; BMI, body mass index; CFAE, complex fractionated atrial electrogram; LA, left atrium; MI, myocardial infarction; RA, right atrium; TIA, transient ischaemic attack.