The Korean Journal of Thoracic and Cardiovascular Surgery  2005;38(1):29-37

The Systemic Effects of Hypothermic and Normothermic Cardiopulmonary Bypass in Cardiac Surgery.

Jae Min PARK 1 ; Yong Gil CHO ; Kwang Hyun CHO ; Yoon Ho HWANG ; Yang Haeng LEE ; Young Chul YOON ; Hee Jae JUN ; Il Yong HAN ; Seok Cheol CHOI

Affiliations

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Keywords

Cardiac surgery; Cardiopulmonary bypass; Hypothermia; Normothermia; Inflammation

Country

Republic of Korea

Language

Korean

MeSH

Abstract

BACKGROUND: This study was prospectively designed to determine the physiologic effects of normothermic CPB and to compare its influences with hypothermic CPB. MATERIAL AND METHOD: Thirty-six adult patients scheduled for elective cardiac surgery were randomly assigned to moderate hypothermic (hypothermic group nasopharyngeal temperature 26~28 degreeC, n=18) or normothermic (normothermic group, nasopharyngeal temperature>35.5 degreeC, n=18) CPB. Arterial blood samples were taken before CPB (Pre-CPB), 10 minutes after the start of CPB (CPB-10), and immediately after CPB stop (CPB-off) for determining total leukocyte counts, neuron-specific enolase (NSE), interleukin-6 (IL-6), endothelin-1 (ET-1), cortisol, troponin I (TNI), aspartate aminotransferase (AST), alanine aminotransferase (ALT), creatinine, blood urea nitrogen (BUN), and the pulmonary index (PI, PaO2/FiO2). Other parameters such as urine output, mechanical ventilating period, ICU-staying period, postoperative complications and hospitalized days were also evaluated. RESULT: Total leukocyte counts, increased rate in NSE, in IL-6 and in cortisol at CPB-10 and CPB-off were significantly higher in normothermic group than in hyphothermic group. Urine output during CPB was lower in normothermic group than in hyphothermic group. The duration of mechanical ventilation, ICU-stay, and hospitalization were longer in normothermic group than in hyphothermic group. CONCLUSION: These findings suggested that normothermic CPB caused higher inflammatory and stress responses than hypothermic CPB during cardiac surgery using cold crystalloid cardioplegia. However, further studies with large number of cases should be carried out to validate this hypothesis.