Etiological factors and perinatal risks in symmetrical and asymmetrical intrauterine growth retardation
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Fetuses with intrauterine growth retardation (IUGR) are of two types—symmetrical and asymmetrical, and it is important to differentiate between the two types antenatally. Ultrasound studies on 22 patients with IUGR were done after 28 weeks of gestation. The fetuses were distinguished as symmetrical and asymmetrical on the basis of ratio of head to abdominal circumference. It was found that the ratio of head to abdominal circumference differentiated well between the two types of IUGR after 36 weeks of gestation. The etiology and perinatal behaviour in the two groups were also different. A single head: abdominal circumference ratio may be useful in differentiating between symmetrical and asymmetrical IUGR after 36 weeks.
Key wordsIntrauterine growth retardation IUGR
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