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Improved interstage mortality with the modified Norwood procedure: a meta-analysis.
Clifford L Cua1, Ravi R Thiagarajan, Roozbeh Taeed
1Department of Pediatrics, Division of Pediatric Cardiology, Columbus Children's Hospital, Columbus, Ohio 43205-2696, USA. cuac@pediatrics.ohio-state.edu
The Annals of Thoracic Surgery
|June 25, 2005
Summary
The modified Norwood procedure significantly reduces interstage mortality compared to the classic Norwood procedure. This meta-analysis suggests a lower risk of death between surgical stages for infants undergoing the modified approach.
Area of Science:
- Cardiology
- Pediatric Surgery
- Medical Statistics
Background:
- The Norwood procedure is a critical intervention for infants with hypoplastic left heart syndrome.
- While modifications aim to improve outcomes, interstage mortality remains a concern.
- Previous studies lacked sufficient data to definitively assess interstage mortality differences between classic and modified Norwood procedures.
Purpose of the Study:
- To determine if a meta-analysis could provide sufficient statistical power to demonstrate a difference in interstage mortality between the classic and modified Norwood procedures.
- To evaluate the effectiveness of modified Norwood procedures in reducing interstage mortality.
Main Methods:
- A comprehensive literature search was conducted on PubMed for articles published between January 2003 and October 2004.
- Five relevant manuscripts comparing classic and modified Norwood procedures were selected for review.
- Mantel-Haenszel analysis and Breslow-Day tests were employed to assess mortality differences and homogeneity of odds ratios across hospitals.
Main Results:
- The meta-analysis included data on 72 patients (classic Norwood) and 84 patients (modified Norwood) surviving to hospital discharge.
- Interstage death odds were 11.6 times higher for the classic Norwood procedure compared to the modified approach (95% CI: 2.2 to 62.1).
- This difference in interstage mortality was statistically significant (Mantel-Haenszel chi2 = 11.0, p = 0.001).
Conclusions:
- The modified Norwood procedure is associated with a statistically significant reduction in interstage mortality.
- These findings highlight the potential benefit of the modified Norwood procedure in improving survival rates for complex congenital heart defects.
- Further large-scale randomized studies are recommended to confirm these significant findings.