Background: Hemodialysis is the process of cleaning blood outside the body, involves taking blood from a blood vessel and passing it through a synthetic filter, known as a dialyzer. Intradialytic hypertension (IDH) is a phenomenon where blood pressure increases during hemodialysis ,and associated with increased mortality in hemodialysis patients. Majority of patients with IDH suffer and die from cardiovascular complications, Aim of the work : The aim of the work is to estimate the incidence of IDH among the hemodialysis patients, and to study myocardial functional disorders during hemodialysis in IDH patients. , Patient and Methods: study was carried out in hemodialysis unit ,internal medicine department of Benha University Hospital, where 100 patients were selected, Conventional echocardiography and were done immediately before and after HD, Results: incidence of IDH was 30%. Mean LVEDD significantly decreased post dialysis from 48.3 mm to 46.6 mm. P value was