Table 3.

Characteristics of severe complications

Cardiac tamponade with pericardiocentesis (n = 3)
	Timing (post-ablation)	Aspirated volume	Aspirate characteristics	Presumed mechanism	Consequence
Patient 1 (vHPSD)	intraprocedural	1000 mL	Arterial blood	Transseptal puncture	Dressler syndrome, prolonged hospitalization
Patient 2 (vHPSD)	2 h	500 mL	Venous blood	Steam pop during ablation of CTI with 40 W	Prolonged hospitalization
Patient 3 (LPLD)	5 h	300 mL	Serous fluid	Post-cardiac injury syndrome	Prolonged hospitalization, repeat pericardiocentesis after two weeks
Transient ischaemic attack (n = 3)
	Timing (post-ablation)	Symptom duration	Symptoms	Presumed mechanism	Imaging
Patient 4 (vHPSD)	24 h	15 min	Paresthesia (left face side and left arm), dysphasia	Unknown	CT
Patient 5 (LPLD)	4 days	20 min	Hemianopsia (left-sided) and hypoesthesia (left arm)	mean ACT ≤280 s	CT
Patient 6 (LPLD)	48 h	6 h	hypoesthesia (left fingers, left corner of the mouth)	mean ACT ≤280 s	CT, MRI

ACT = activated clotting time; CT = computed tomography; CTI = cavotricuspid isthmus; LPLD = low-power long-duration ablation; MRI = magnetic resonance imaging; vHPSD = very high-power short-duration ablation.