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Survival through staged palliation: fate of infants supported by extracorporeal membrane oxygenation after the Norwood operation.
Annals of Thoracic Surgery 2014 Februrary
BACKGROUND: Infants supported by extracorporeal membrane oxygenation (ECMO) after a Norwood operation face in-hospital mortality rates of 60% to 70%. There are limited data on completion of staged palliation for the subset of patients who survive to hospital discharge.
METHODS: We performed a retrospective case-control study of 64 sequential patients at a single institution supported by ECMO after a Norwood operation. Primary endpoints were survival to hospital discharge, stage II palliation, and stage III palliation. Predictors of non-survival to each endpoint were identified with logistic regression. Survival was compared with a 3:1 era-matched group of control patients who underwent a Norwood operation but did not require ECMO.
RESULTS: Survival to hospital discharge, stage II palliation, and stage III palliation was 43.8%, 35.9%, and 25.4%, respectively for ECMO cases. Factors independently associated with non-survival to hospital discharge included female gender, ECMO 7 days or greater, and need for renal replacement therapy on ECMO. Non-Caucasian race and ECMO 7 days or greater were independently associated with non-survival to stage II, while non-Caucasian race, lower birth weight, and ECMO 7 days or greater were independently associated with non-survival to stage III. Extracorporeal membrane oxygenation was associated with decreased survival at each endpoint. Patients who survived ECMO had increased interstage mortality between hospital discharge and stage II palliation.
CONCLUSIONS: Extracorporeal membrane oxygenation after a Norwood operation can be life-saving but ultimate survival through staged palliation remains suboptimal. The elevated mortality risk for patients supported by ECMO persists after hospital discharge. Both socioeconomic factors and ECMO-related morbidity may contribute to midterm mortality.
METHODS: We performed a retrospective case-control study of 64 sequential patients at a single institution supported by ECMO after a Norwood operation. Primary endpoints were survival to hospital discharge, stage II palliation, and stage III palliation. Predictors of non-survival to each endpoint were identified with logistic regression. Survival was compared with a 3:1 era-matched group of control patients who underwent a Norwood operation but did not require ECMO.
RESULTS: Survival to hospital discharge, stage II palliation, and stage III palliation was 43.8%, 35.9%, and 25.4%, respectively for ECMO cases. Factors independently associated with non-survival to hospital discharge included female gender, ECMO 7 days or greater, and need for renal replacement therapy on ECMO. Non-Caucasian race and ECMO 7 days or greater were independently associated with non-survival to stage II, while non-Caucasian race, lower birth weight, and ECMO 7 days or greater were independently associated with non-survival to stage III. Extracorporeal membrane oxygenation was associated with decreased survival at each endpoint. Patients who survived ECMO had increased interstage mortality between hospital discharge and stage II palliation.
CONCLUSIONS: Extracorporeal membrane oxygenation after a Norwood operation can be life-saving but ultimate survival through staged palliation remains suboptimal. The elevated mortality risk for patients supported by ECMO persists after hospital discharge. Both socioeconomic factors and ECMO-related morbidity may contribute to midterm mortality.
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