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J Thorac Cardiovasc Surg 2005;129:192-198
© 2005 The American Association for Thoracic Surgery
Surgery for Congenital Heart Disease |
a Division of Cardiovascular, Thoracic, and Pediatric Surgery, Department of Cardio-pulmonary and Vascular Medicine, Kobe University Graduate School of Medicine, Kobe, Japan
b Department of Cardiothoracic Surgery, Kobe Children's Hospital, Kobe, Japan
Received for publication February 24, 2004; revisions received May 7, 2004; accepted for publication May 13, 2004.
* Address for reprints: Yutaka Okita, MD, Division of Cardiovascular, Thoracic, and Pediatric Surgery, Department of Cardio-pulmonary and Vascular Medicine, Kobe University Graduate School of Medicine, Kusunoki-cho, Chuo-ku, Kobe 650-0017, Japan
yokita{at}med.kobe-u.ac.jp
OBJECTIVE: Heart fatty acidbinding protein is a rapid indicator for assessment of myocardial damage in cardiac surgery. The purpose of this study was to investigate the effects of age and ischemic time on the biochemical evidence and clinical outcomes of myocardial damage in pediatric cardiac surgery.
METHODS: A prospective observational cohort study conducted over 2.5 years was performed in 98 consecutive patients (51 infants and 47 children) undergoing cardiac surgery for ventricular septal defects. Serial measurements of serum levels of heart fatty acidbinding protein and the respective areas under the curve were obtained, with particular reference to age and aortic crossclamp time. Assessment of clinical outcomes included inotropic support, ventilatory support, and intensive care unit stay.
RESULTS: There was a linear dependence of the logarithm of age and the logarithm of heart fatty acidbinding protein release(r = 0.737, P < .0001). This logarithm-logarithm plot showed a power function of age for heart fatty acidbinding protein release. The exponent and amplitude parameter of the power function was the aortic crossclamp time. Compared with children, infants had significantly more myocardial damage and worse clinical outcomes, and these factors were related to the aortic crossclamp time.
CONCLUSIONS: The younger the age of patients, the more vulnerable are their myocardia to injury caused by ischemia during definitive repair of congenital heart disease. Therefore, perioperative management for pediatric patients after cardiac surgery should be performed, taking into consideration the dependence of the myocardial damage on age and ischemic time.
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