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Different predictivity of fluid responsiveness by pulse pressure variation in children after surgical repair of ventricular septal defect or tetralogy of Fallot

Pulse pressure variation derived from the varied pulse contour method is based on heart‐lung interaction during mechanical ventilation. It has been shown that pulse pressure variation is predictive of fluid responsiveness in children undergoing surgical repair of ventricular septal defect. Right ventricle compliance and pulmonary vascular capacitance in children with tetralogy of Fallot are underdeveloped as compared to those in ventricular septal defect. We hypothesized that the difference in the right ventricle‐pulmonary circulation in the two groups of children would affect the heart‐lung interaction and therefore pulse pressure variation predictivity of fluid responsiveness following cardiac surgery.