Risk factors for residual stenosis or re-stenosis
All study participants with follow-up echocardiography were
classified
into two groups. The first group (83.4%) included patients with a
residual stenosis of <40 mmHg after initial PBPV. The other
group (16.6%) included patients with residual stenosis after initial
PBPV or re-stenosis of ≥40 mmHg during follow-up, and some of them
underwent repeat intervention.
Univariate analysis results showed that the group with
residual stenosis or re-stenosis
had younger age, lower weight, and smaller body
surface area at the time of
initial PBPV. Moreover, patients in that group had small pulmonary
annulus diameter at baseline, higher RV-PA PSEG, and increased
RV/systemic pressure ratio
(P
<0.05). Critical PVS was statistically associated with
residual stenosis or repeat intervention, while BAR had no significant
association. (Table 6).
Multivariate analysis results showed that higher initial RV-PA PSEG (OR:
1.056, 95% CI: 1.035–1.078) was a significant independent risk factor
for residual stenosis after initial PBPV or re-stenosis of ≥40 mmHg
during follow-up (P <0.05) (Table 7).