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Prediction of outcome in congenital diaphragmatic hernia
A Numanoglu1, C Morrison, H Rode
1Department of Paediatric Surgery, Red Cross Children's Hospital, University of Cape Town, 7700 Rondebosch, South Africa.
Insights
A new formula, the Red Cross formula, accurately predicts mortality and survival in infants with congenital diaphragmatic hernia (CDH). This tool can improve management of this severe condition.
Area of Science:
- Pediatric Surgery
- Neonatology
- Medical Informatics
Background:
- Congenital diaphragmatic hernia (CDH) is a severe condition requiring respiratory support.
- Predicting outcomes in CDH patients is crucial for effective management.
- Previous predictive models for CDH have limitations.
Purpose of the Study:
- To retrospectively evaluate the predictive accuracy of three formulae for patient outcomes in congenital diaphragmatic hernia (CDH).
- To introduce and assess a newly derived formula, the Red Cross formula, for predicting CDH patient mortality and survival.
- To determine if a superior predictive tool exists for managing CDH.
Main Methods:
- Retrospective analysis of 36 infants with congenital diaphragmatic hernia (CDH) requiring respiratory support.
- Measurement of arterial blood gases during the initial resuscitation period.
- Application and comparison of three predictive formulae: ventilation index vs. PCO2, alveolar-arterial oxygen gradient, and the Red Cross formula.
Main Results:
- The Red Cross formula demonstrated a 100% predictive value for mortality and an 85% predictive value for survival.
- The Red Cross formula achieved an overall predictive accuracy of 91.6%.
- Seventeen patients (47.2%) survived, and 19 (52.8%) died; 21 underwent surgery.
Conclusions:
- The Red Cross formula significantly outperforms other studied methods in predicting outcomes for congenital diaphragmatic hernia (CDH) patients.
- This highly accurate predictive formula can aid in the clinical management of CDH.
- The Red Cross formula offers a valuable tool for assessing prognosis in neonates with CDH.
Abstract:
The case records of 59 patients with congenital diaphragmatic hernia (CDH) who presented between 1984 and 1997 were studied retrospectively. Included in the study were infants born with CDH who required respiratory support within the first 6 h of life. Twenty-three were excluded from the study for various reasons; 36 were enrolled in the study; the male-to-female ratio was 18:18. Twenty-nine hernias were left-sided and 7 were right-sided. All patients were ventilated using conventional techniques. Arterial blood gases were measured on average 1.76 h following admission and the initial period of resuscitation (range 1-4 h). Three formulae were applied in an attempt to predict outcome: ventilation index against PCO2, alveolar-arterial oxygen gradient, and a newly derived formula from this institution (Red Cross formula) that comprises respiratory rate x PCO2 x FiO2 x mean airway pressure/PaO2 x 6000. Seventeen patients (47.2%) survived and 19 died (52.8%); 21 became stable enough to undergo surgery. The average time from presentation until surgery was 1.98 days (range 6 h to 4 days). The Red Cross formula, with a 100% predictive value for mortality, 85% predictive value for survival, and an overall predictive value of 91.6%, appeared to be superior to the other formulae studied. The availability of a highly accurate predictive formula may facilitate management of this frequently lethal disease.