ESTIMATION OF THE ACCURACY OF DIFFERENT METHODS FOR DETERMINING THE WEIGHT OF A LARGE FETUS BY ECHOGRAPHY


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Abstract

Objective. To estimate the accuracy of determining the weight of a large fetus, by using the computer program elaborated by V.N. Demidov and the equations by foreign authors. Materials and methods. The weight of 175 large fetuses in late pregnancy was calculated using the computer programs and equations. The time that elapsed from the last study before birth of the fetus ranged within 0- 5 days. Results. The error in the calculation of fetal weight using the computer program by V.N. Demidov was 189.9 g and that with the equations by R.K. Tamura, and H. Schillinger was 230.1 and 245.1 g, respectively. At the same time, the error in the use of the equations of the latter two authors proved to be 21.1% and 29.1% greater, respectively, than that in the application of the computer program. An error greater than 500g in the application of the computer program was observed much less frequently (5.71%) than that when the equations by the above two authors were used (7.42 and 8.0%). A permissible error not exceeding the true fetal weight more than 10% in the application of the computer program was found only in 8% of cases, whereas when using the equations by the other two authors, it was 13.1 and 13.7%, respectively. Conclusion. The computer program elaborated by V.N. Demidov can yield the best results now when determining the weight of a largest fetus.

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About the authors

E. A DERKACH

Maternity Hospital Six

Email: derkachea@inbox.ru
the doctor of ultrasonic diagnostics Nizhny Novgorod 603040, Geroy Sutyrin str. 19, Russia

O. I GUSEVA

Nizhny Novgorod State Medical Academy

Email: alise52@yandex.ru
MD, Professor of Department of Obstetrics and Gynecology, Faculty for Postgraduate Training of Physicians Nizhny Novgorod 603005, Minin and Pozharsky sq. 10/1, Russia

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