Assessment of differences in sonar biparietal diameter values regarding fetal age and weight
✍ Scribed by Rudy E. Sabbagha
- Publisher
- John Wiley and Sons
- Year
- 1973
- Tongue
- English
- Weight
- 478 KB
- Volume
- 1
- Category
- Article
- ISSN
- 0091-2751
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✦ Synopsis
Abstract
Various investigators have reported different mean BPD measurements to represent the attainment of a specific gestational week or of a predicted mean weight. These differences are too large to be attributed solely to inherent population variabilities. Nonuniformity in methodology and in standardization of equipment are additional factors contributing to this observed variance. Furthermore in ascertaining the accuracy of sonar BPD measuring methods, comparison of in utero results can only be made with postnatal caliper readings obtained from fetuses delivered by repeat cesarean section. This study demonstrates that the closest correlation between prenatal sonar and postnatal caliper BPD values is obtained when nonpersistent image scanning (NPIS) and electronic calipers are integrated into the procedure of ultrasonic cephalometry. However since the calibration of electronic markers is dependent upon the speed of ultrasound through the skull and brain tissue per unit of time, it is mandatory that a universally agreed upon velocity be used by all manufacturers of ultrasonic equipment. Biparietal diameter differences resulting from inherent population variabilities alone, can only be assessed after uniform methodology is adopted. Until such time, each center utilizing diagnostic sonography must establish and depend on its own intrauterine BPD scale, for the clinical management of patients.
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