每搏变异度联合左室射血时间用于老年冠心病患者胃肠道手术中容量治疗的临床效果
매박변이도연합좌실사혈시간용우노년관심병환자위장도수술중용량치료적림상효과
Effects of stroke volume variation combined with left ventricular ejection time to guide fluid therapy in elderly patients with coronary heart disease
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