Correlation analysis between pleth variability index and stroke volume variation under different body postures and pneumoperitoneum pressures
Objective To explore the correlation between pleth variability index (PVI) and stroke volume variability (SVV) under different body postures and pneumoperitoneum pressures. Methods A total of 60 patients underwent laparoscopic radical resection of right colon cancer in People's Hospital of Inner Mongolia Autonomous Region from June to December 2022 were selected. After general anesthesia,the changes of HR,MAP,PVI and SVV were monitored in three body postures in turn,namely horizontal posture (T1),Trendelenburg (T2) and Trendelenburg left tilt 45° posture (T3),and the correlation between PVI and SVV under different postures were analyzed. Before operation,the patients were divided into group A (10 mmHg),group B (12 mmHg) and group C (14mmHg) (1mmHg=0.133 kPa) according to different pneumoperitoneum pressures,with 20 cases in each group. The changes of HR,MAP,PVI and SVV in three groups under different body postures were monitored,and the correlation between PVI and SVV under different pneumoperitoneum pressures were analyzed. Results Among the 60 patients,there were 32 males and 28 females,with an average age of (53.1±7.7) years. Compared with T1 before pneumoperitoneum,HR at T2 and T3 was lower,the difference was statistically significant (P<0.05),and there was a linear positive correlation between PVI and SVV at the three postures (P<0.05). Under three postures after pneumoperitoneum,compared with group A,the MAP,PVI and SVV in group B and group C were higher,while HR was lower and MAP was higher in group C compared with group B,and the differences were statistically significant (P<0.05). There was a linear positive correlation between PVI and SVV in group A under three different postures after pneumoperitoneum (P<0.05). Conclusions In the absence of pneumoperitoneum,PVI and SVV are linearly positively correlated in different postures. After pneumoperitoneum,there is a linear positive correlation between PVI and SVV at a lower pneumoperitoneum pressure (10 mmHg) at different postures. Body position does not affect the positivecorrelation between PVI and SVV,while pneumoperitoneum pressure more than 10mmHg may affect the correlation between the two indicators.
pleth variability index (PVI)stroke volume variation (SVV)pneumoperitoneum pressurehorizontal positionTrendelenburg positionTrendelenburg position left tilt 45°
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