The Optimal Timing of Stage 2 Palliation for Hypoplastic Left Heart Syndrome
Key result
In HLHS, S2P 3-6 months post-Norwood is linked to maximal ~68% 3-year transplant-free survival.
- n=547
Why the study?
Does a specific timing interval for stage 2 palliation improve transplant-free survival in infants with hypoplastic left heart syndrome after the Norwood procedure?
Population
547 infants requiring 3-stage single-ventricle palliation for hypoplastic left heart syndrome from the…
Comparison
Stage 2 palliation performed at 3 to 6 months… vs Other timing intervals for stage 2 palliation
Design
Cohort
Follow-up
3 years
Authors
Discussion
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Implication
May support 3-6 month stage 2 timing in low-risk HLHS infants post-Norwood; hypothesis-generating and requires prospective confirmation before practice change.
Key Points
- To determine whether an optimal interval exists between the Norwood procedure and stage 2 palliation that minimizes interstage attrition and maximizes 3-year transplant-free survival.
- Analyzed public dataset records from the Pediatric Heart Network Single Ventricle Reconstruction Trial (N=547; NCT00115934).
- Modeled transplant-free survival from Norwood to stage 2 palliation and from stage 2 palliation to 3 years using parametric hazard analysis.
- Calculated risk-adjusted, 3-year post-Norwood transplant-free survival via parametric conditional survival analysis to generate timing nomograms.
- Overall, 399 of 547 patients survived to stage 2 palliation (73%), and 349 of those 399 survived to 3 years (87%), yielding a risk-adjusted 3-year transplant-free survival of 68±7% with a median interstage interval of 5.1 months (IQR, 4.1–6.0 months).
- A Norwood-to-stage-2 interval of 3 to 6 months yielded the highest 3-year transplant-free survival overall and in low-risk infants, with no difference across shunt types.
- Transplant-free survival was severely compromised in infants with multiple risk factors regardless of timing, with the worst outcomes observed when stage 2 palliation was performed early.
Study Design
Type
Cohort (n=547)
Multicenter
Yes
Structured PICO
Does a specific timing interval for stage 2 palliation improve transplant-free survival in infants with hypoplastic left heart syndrome after the Norwood procedure?
P
Population
547 infants with hypoplastic left heart syndrome requiring 3-stage single-ventricle palliation, evaluated for transplant-free survival up to 3 years.
E
Exposure
Stage 2 palliation (S2P) performed at 3 to 6 months after the Norwood procedure
C
Comparator
Other timing intervals for stage 2 palliation (e.g., early S2P)
O
Outcome
Transplant-free survival (TFS) at 3 years post-Norwoodcomposite
In infants with hypoplastic left heart syndrome and few risk factors, performing stage 2 palliation 3 to 6 months after the Norwood procedure maximizes 3-year transplant-free survival.
Cite This Study
Meza et al. (2017) conducted a cohort in Hypoplastic left heart syndrome (n=547). Timing of stage 2 palliation (S2P) vs. Different timing intervals was evaluated on Transplant-free survival (TFS) at 3 years. In infants with hypoplastic left heart syndrome, progressing to stage 2 palliation at 3 to 6 months after the Norwood procedure was associated with maximal 3-year transplant-free survival (overall 68±7%).