Fig. 6From: Correlation between pleth variability index and ultrasonic inferior vena cava-collapsibility index in parturients with twin pregnancies undergoing cesarean section under spinal anesthesiaFitted post-anesthesia PVI to IVC-CI% regression equation. Post-anesthesia IVC-CI% = 1.489 + 0.8238 post-anesthesia PVIBack to article page