Acute haemodynamic outcomes after stratification into invasive pre-procedural RV-to-PA pressure gradients
| Parameter | PPVI | BMS+PPVI | p Value |
| Subgroup 1 (‘mild’ RV-to-PA gradient*: 0–25 mm Hg) | (n=23) | (n=12) | |
| Pre-procedural RV-to-PA gradient, mm Hg | 15±7 | 15±7±1.6 | 0.84 |
| Change in RV-to-PA gradient, mm Hg | −5±6 | −5±8 | 0.81 |
| Patients with high-pressure balloon dilatations, n | 10 | 2 | 0.15 |
| Subgroup 2 (‘moderate’ RV-to-PA gradient: 26–40 mm Hg) | (n=16) | (n=17) | |
| Pre-procedural RV-to-PA gradient, mm Hg | 34±5 | 33±4 | 0.37 |
| Change in RV-to-PA gradient, mm Hg | −22±7 | −21±8 | 0.69 |
| Patients with high-pressure balloon dilatations, n | 14 | 11 | 0.22 |
| Subgroup 3 (‘severe’ RV-to-PA gradient: >40 mm Hg) | (n=12) | (n=20) | |
| Pre-procedural RV-to-PA gradient, mm Hg | 52±9 | 53±10 | 0.86 |
| Change in RV-to-PA gradient, mm Hg | −36±15 | −39±8 | 0.56 |
| Patients with high-pressure balloon dilatations, n | 10 | 17 | 1.00 |
Continuous data presented as mean ± SD.
↵* RV-to-PA, right ventricle to pulmonary artery. Paired invasive RV-to-PA pressure gradients enabling stratification into three groups were available in 100/108 (93%) patients.
BMS, bare metal stenting; PPVI, percutaneous pulmonary valve implantation.