Comparison of Carotid Peak Systolic Velocity Variation With Aortic Peak Systolic Velocity Variation in Pediatric Non-Cardiac Surgery

The purpose of this study is to evaluate whether carotid Doppler peak systolic velocity can be an easy to measure possible surrogate for echocardiographic measurement of aortic peak systolic velocity variation which is an index of fluid responsiveness in mechanically ventilated children intra-operatively.