Purpose: Myocardial revascularization by coronary artery bypass grafting (CABG) in ischemic heart disease patients has direct impact on hemodynamic parameters in the immediate post-operative period. The peri-operative...Purpose: Myocardial revascularization by coronary artery bypass grafting (CABG) in ischemic heart disease patients has direct impact on hemodynamic parameters in the immediate post-operative period. The peri-operative cardiovascular functioning is an important determinant for outcome of surgery. In On-Pump CABG (ONCAB), the cardiopulmonary bypass has a negative effect on myocardium. Off-Pump CABG (OPCAB) avoids the effect of CPB but complete revascularization with difficult positioning of heart is technically demanding. This study is aimed to compare the cardiovascular functioning in the immediate post-operative period after OPCAB and ONCAB. Methods: Total 106 patients were operated for CABG from January 2015 to June 2016, of which 75 patients were operated for OPCAB and 31 patients were operated for ONCAB. For the comparison, hemodynamic parameters were measured during anesthesia before surgery, postoperatively after 1 and 4 hours (h) in the ICU, and in the morning after surgery, approximately after 20 h. Results: The time-dependent rise of hemodynamic parameters like Cardiac Output (CO), Cardiac Index (CI), Stroke volume (SV) and Left Ventricular Stroke Work Index (LVSWI) in the immediate post-operative hours (1 h and 4 h) are more predominant in OPCAB group than ONCAB group although the difference is eliminated mostly at 20 h. The better peripheral vasodilation after OPCAB causes immediate fall of Systemic Vascular Resistance Index (SVRI) after OPCAB. Conclusion: Better cardiovascular functioning immediately after OPCAB than ONCAB may be important for better hemodynamic stability. The difference is however eliminated after 24 hours indicating little significance in long term outcome.展开更多
目的研究心脏搏动做功的规律,质疑Frank-Starling心脏定律。方法根据物理学机械做功的定义,以左心室收缩射血做功为模型对心脏收缩舒张做功活动进行讨论,然后用数学方法得出结论。结果 1作者推导出计算vvvv心脏每搏收缩舒张做功的公式&q...目的研究心脏搏动做功的规律,质疑Frank-Starling心脏定律。方法根据物理学机械做功的定义,以左心室收缩射血做功为模型对心脏收缩舒张做功活动进行讨论,然后用数学方法得出结论。结果 1作者推导出计算vvvv心脏每搏收缩舒张做功的公式"d d W=∫p1dv+(-p2)d d dv+(-p4)dV=[P1+(-P2)+P3+(-P4)]·V vs∫vs∫p3dv+vs∫vs=[P1+(-P2)+P3+(-P4)]·(EDV-ESV)"(式中,P1,P3分别代表心脏收缩时左、右心室腔内的压力;P2,P4为心脏舒张期左、右心室腔内的压力;V为每搏量;Vs和Vd为心脏收缩开始和结束,即:心脏收缩舒张做功时心室肌壁移动的区间;EDV和ESV为心脏舒张末期与收缩末期容积;dv为射出或吸入心室的血液容积增量)。2局部心室肌壁收缩做功与其肌壁收缩移动时的"ah"值成正比例(a为心脏收缩时局部心室肌壁位移动的加速度,h为其收缩时的位移)。结论 1在推导出的公式"W=[P1+(-P2)+P3+(-P4)]·(EDV-ESV)"中,心脏做功W和(EDV-ESV)与EDV三者之间的数学关系表明:W是(EDV-ESV)的函数,和单一参数EDV却没有函数关系,这就证明了心脏做功W是EDV的函数的理论(Frank-Starling心脏定律)没有理论上的必然性,它不是一个真实的定律。2超声检测某一点心室肌壁收缩活动时的"ah"值,可作为评价其心脏收缩功能的指标;舒张时的"ah"值可作为评价其舒张功能的指标。展开更多
文摘Purpose: Myocardial revascularization by coronary artery bypass grafting (CABG) in ischemic heart disease patients has direct impact on hemodynamic parameters in the immediate post-operative period. The peri-operative cardiovascular functioning is an important determinant for outcome of surgery. In On-Pump CABG (ONCAB), the cardiopulmonary bypass has a negative effect on myocardium. Off-Pump CABG (OPCAB) avoids the effect of CPB but complete revascularization with difficult positioning of heart is technically demanding. This study is aimed to compare the cardiovascular functioning in the immediate post-operative period after OPCAB and ONCAB. Methods: Total 106 patients were operated for CABG from January 2015 to June 2016, of which 75 patients were operated for OPCAB and 31 patients were operated for ONCAB. For the comparison, hemodynamic parameters were measured during anesthesia before surgery, postoperatively after 1 and 4 hours (h) in the ICU, and in the morning after surgery, approximately after 20 h. Results: The time-dependent rise of hemodynamic parameters like Cardiac Output (CO), Cardiac Index (CI), Stroke volume (SV) and Left Ventricular Stroke Work Index (LVSWI) in the immediate post-operative hours (1 h and 4 h) are more predominant in OPCAB group than ONCAB group although the difference is eliminated mostly at 20 h. The better peripheral vasodilation after OPCAB causes immediate fall of Systemic Vascular Resistance Index (SVRI) after OPCAB. Conclusion: Better cardiovascular functioning immediately after OPCAB than ONCAB may be important for better hemodynamic stability. The difference is however eliminated after 24 hours indicating little significance in long term outcome.
文摘目的研究心脏搏动做功的规律,质疑Frank-Starling心脏定律。方法根据物理学机械做功的定义,以左心室收缩射血做功为模型对心脏收缩舒张做功活动进行讨论,然后用数学方法得出结论。结果 1作者推导出计算vvvv心脏每搏收缩舒张做功的公式"d d W=∫p1dv+(-p2)d d dv+(-p4)dV=[P1+(-P2)+P3+(-P4)]·V vs∫vs∫p3dv+vs∫vs=[P1+(-P2)+P3+(-P4)]·(EDV-ESV)"(式中,P1,P3分别代表心脏收缩时左、右心室腔内的压力;P2,P4为心脏舒张期左、右心室腔内的压力;V为每搏量;Vs和Vd为心脏收缩开始和结束,即:心脏收缩舒张做功时心室肌壁移动的区间;EDV和ESV为心脏舒张末期与收缩末期容积;dv为射出或吸入心室的血液容积增量)。2局部心室肌壁收缩做功与其肌壁收缩移动时的"ah"值成正比例(a为心脏收缩时局部心室肌壁位移动的加速度,h为其收缩时的位移)。结论 1在推导出的公式"W=[P1+(-P2)+P3+(-P4)]·(EDV-ESV)"中,心脏做功W和(EDV-ESV)与EDV三者之间的数学关系表明:W是(EDV-ESV)的函数,和单一参数EDV却没有函数关系,这就证明了心脏做功W是EDV的函数的理论(Frank-Starling心脏定律)没有理论上的必然性,它不是一个真实的定律。2超声检测某一点心室肌壁收缩活动时的"ah"值,可作为评价其心脏收缩功能的指标;舒张时的"ah"值可作为评价其舒张功能的指标。
