Cardiac catheter ablation procedure counts within the populations of interest (atrial fibrillation and ventricular tachycardia)
| Health system | Ablation procedures (AF population) | Ablation procedures (VT population) | Ablation procedures (‘other primary’ and ‘missing primary’) | Total |
| Mercy Health (1 January 2014–20 February 2020) | 2471 | 198 | 2530 | 5199 |
| Mayo Clinic (1 January 2014–31 December 2019) | 4906 | 1140 | 3142 | 8932 |
| Yale New Haven Hospital (1 February 2013–13 August 2019) | 1299 | 527 | 3004 | 4830 |
| Total | 8676 | 1865 | 8676 | 18 961 |
AF, atrial fibrillation; VT, ventricular tachycardia.