Lung Ultrasound Versus Cardiometry in Detection of Extravascular Lung Water in Pediatric Patients on Hemodialysis.

: B-lines of lung ultrasound and the parameters of cardiometry will be measured at the mid-week HD session before starting the session by 30 min then every 30min during HD session for 180 min and then after the end of the session of HD by 30 min and then The specificity and sensitivity of both techniques will be compared to each other