RELEASE OF SERUM TROPONIN I AND ITS RELATIONSHIP TO MULTIFACTORS FOLLOWING OPEN HEART SURGERY IN CHILDREN

Objective To be released specifically after myocardial damage. The goal of this study was to measure serum cardiac troponin I levels after open heart surgery in children, and to evaluate relevance between TnTi and perioperative multi-factors. Methods Fifty-seven consecutive pediatric patients undergoing elective correction of congenital heart diseases were divided into group A （ TOF, n =31 ） and group B （ VSD, n =26）. Blood sampies were drawn preoperatively, 5min（ T0 ） , 6h（ T6 ） , 12h（ T12 ） , 24h（ T24 ） , 48h（ T48 ） , 72h（ T72 ） after removal of aortic cross clamping. Myocardial protection consisted of moderate systemic hypothermia （ 30℃- 32℃ ）, cold crystalloid cardioplegia and topical cooling. Demographic information, cardiac defect, repair procedure, duration of bypass （ CPBT） , cross-clamping time （ CCT） , clinical score for cardiac function, electrocardiographic changes and outcomes were recorded. Results Compared with the baseline value, serum concentration of troponin I peaked at T0 （ P 〈 0. 01 ）, and fell to normal level at T72 （ P 〉 0. 05 ）. Peak CTnI was 118 and 55 times higher than the baseline value, respectively in group A and group B. There was a positive correlation between peak CTnI and CPBT, CCT （ r = 0. 51 ; P 〈 0. 01 ）, myocardial operative injury after ventriculotomy and muscle resection （ r = 0. 35, P 〈0. 01 ）. Also the peak CTnl value was correlated to the clinical score for cardiac function （r = -0. 52; P 〈0. 01）. 2.3μg/L was a cutoff value which was highly predictive for postoperative recovery and inotropic support. Conclusion Postoperative serum troponin I is a highly specific and sensitive marker for myocardial ischemia and injury; therefore, its measurement may contribute to the assessment of recovery and outcome after open heart surgery.

RELEASE OF SERUM TROPONIN I AND ITS RELATIONSHIP TO MULTIFACTORS FOLLOWING OPEN HEART SURGERY IN CHILDREN