This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Gynaecology & Obstetrics
[{'content': 'Which of the following Doppler findings in IUGR is associated with worst prognosis? \nSelect and explain. \nA. Dicrotic notch, B. Reversal of diastolic flow, C. Absence of diastolic flow, D. Absence of systolic flow', 'role': 'user'}, {'content': "Answer: B \nExplanation: Doppler screening is done in anatomically normal baby's in which a growth retardation is detected. Normally the diastolic flow increases as pregnancy progresses. Reduced or absent or reversed diastolic flow in the umbilical aery indicates fetal jeopardy and poor perinatal outcome. Doppler velocimetry findings in IUGR are elevated uterine aery systolic/diastolic ratio > 2.6 and or presence of diastolic notch. Ref: Textbook of Obstetrics By D. C Dutta, 6th Edition, Page 463.", 'role': 'assistant'}]