الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Premature births are responsible for 70% of neonatal mortality, 36% of infant mortality and 25-50% of long-term neurological disabilities. In the last 20 years with the scientific and technological developments observed in the field of neonatology, the survival rate of premature infants has significantly increased. Blood flow disturbances are an integral part of the aetiology of neonatal abdominal disorders, especially necrotising enterocolitis. To understand the physiology and pathology of the intestinal circulation, it is obvious that a non invasive clinical method of measuring intestinal blood flow in humans is needed. Cutaneous Doppler ultrasonography allows the identification of intestinal arteries and the measurement of blood flow within them with minimal distress to the patients The study of flow patterns in peripheral arteries by transcutaneous Doppler US is rapidly becoming a common clinical procedure in non-invasive neonatal diagnosis. Measurements of intestinal circulation in human by pulsed Doppler ultrasound of SMA showed significant changes in flow measurements in association with food intake. The SMA is the main source of the blood supply in the digestive tract. The SMA has less blood flow prenatally, which is manifested as high-resistance blood flow, and it increases rapidly because of the change in the fetal circulation and the stimulation of feeding after birth.