PLACENTAL LOCALIZATION BY THE USE OF <sup>132</sup>I‐HUMAN SERUM ALBUMEN AND BY ULTRASONIC SCANNING—A COMPARATIVE STUDY

Aiers, M.; Evered, D.C.; Smith, Anna

doi:10.1111/j.1471-0528.1969.tb05824.x

Cited by 10 publications

(4 citation statements)

References 14 publications

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“…In this respect ultrasound which has no radiation hazard has a tremendous advantage over isotopic placentography. The results achieved using radio-isotope scanning were probably poor because a hand-held scintillation counter was used which is not accepted in modern practice and excellent results were reported by others (Aiers et al, 1969). Comparison showed that ultrasound was superior in all respects excepting the occasional case in which it failed to demonstrate the placenta.…”

Section: Discussionmentioning

confidence: 95%

“…In particular the ability to predict a safe outcome (rather than a grading) of placenta praevia, and to achieve under routine conditions in a busy hospital the accuracy obtained by experts (Donald and Abdulla, 1968;Campbell and Kohorn, 1968;Aiers et al, 1969) was investigated. Clinical assessment will always be the deciding factor in determining management but the proper use of placentography enables the safe discharge of many patients who would otherwise spend many weeks in hospital.…”

Section: Discussionmentioning

confidence: 99%

“…The establishment of a diagnostic ultrasound service in the University of Cape Town teaching hospital group in October, 1970, led to the decision to assess the value of ultrasonics in the management of suspected placenta praevia. In particular the ability to predict a safe outcome (rather than a grading) of placenta praevia, and to achieve under routine conditions in a busy hospital the accuracy obtained by experts (Donald and Abdulla, 1968;Campbell and Kohorn, 1968;Aiers et al, 1969) was investigated. In addition, a comparison was made, where possible, with radio-isotope placental location, the method previously used in the hospital.…”

Section: Discussionmentioning

confidence: 99%

“…Most studies (Hibbard, 1961 ;Campbell and Kohorn, 1968;Aiers et al, 1969) assess the accuracy of their methods by comparing their results with the anatomical position of the placenta. The clinical objective, however, is to obtain a safe result without an excessively high false positive rate.…”

Section: Discussionmentioning

confidence: 99%

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The Clinical Application of Ultrasonic Placentography

Kukard

Freeman

1973

BJOG

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AND SummaryIn a busy hospital an attempt was made to locate the placenta by ultrasound in 437 patients suspected of having a placenta praevia. There were three failures to locate the placenta and two dangerous false negative results. Caesarean section was performed in 126 patients of whom 76 had placenta praevia. The placental site was located by ultrasound in 124 patients delivered abdominally and in 98.4 per cent of them a safe diagnosis was obtained (82.2 per cent of diagnoses were anatomically correct, 8 1 per cent overstated or understated the extent of placenta praevia and 8 * 1 per cent were falsely positive). A correlation was found between the frequency of diagnostic problems and gestational age. Ultrasound provided a safe and reliable method of excluding placenta praevia except in the presence of multiple pregnancy.

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Section: Discussionmentioning

confidence: 95%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

The Clinical Application of Ultrasonic Placentography

Kukard

Freeman

1973

BJOG

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Placental ultrasonography

King¹

1973

J of Clinical Ultrasound

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Ultrasonography is the preferred technique for placental localization. It permits a comparatively precise estimate of the separation of the lower placental margin and internal cervical 0s. Six false positive diagnoses of placenta previa occurred in a series of 244 patients. There were n o false negative diagnoses. The diagnosis of placenta previa was confirmed as correct in ten patients. Determination of the location of the lower margin of a posterior placenta obscured by the overlying fetus may be assisted by measurement of the separation of the anterior sacral margin and the fetal head when the latter is dipping into the pelvis. A separation of greater than 15 millimeters usually indicates extension of the lower placental margin over the sacral promontory and onto the lower uterine segment.

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