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PubMed1975

Nuclear placentography.

Localization of the placenta by radionuclide imaging techniques is useful in assessing the cause of vaginal bleeding late in pregnancy. Placenta previa is the most threatening cause of late gestational bleeding, and the acceptably high accuracy of nuclear placentography in detecting this condition is well-established. Nevertheless, B-mode ultrasonography is a preferable method because it delivers no ionizing radiation and is capable of identifying the cervix in virtually all patients. The latter method will eventually replace nuclear placentography.

Carbon Radioisotopes↗

PubMed1978

[Experience with ultrasonic placentography].

The authors review their procedure adopted at ultrasonic placentography. Examinations were done before amniocentesis in 21 cases and because of supposed placenta praevia in 111 cases. Patients delivered at thier institution, so the site of placental implantation could be controlled. They had only one "dangerous" mistake: considering a placenta praevia to be only placental implantation on the lower segment, otherwise ultrasonic diagnosis was wrong in 5 cases. So the efficience of our method can be taken as 96,2 per cent. The call attention to the difficulties of of posterior wall placenta diagnosis. They state that ultrasonic placentography is the least harmful among available procedures and also the safest way the localisation of placenta.

Diagnosis, Differential↗

PubMedDate not supplied

131I isotope placentography: simple counting equipment in obstetric practice.

Simple counting equipment and radioiodinated human serum albumin (131IHSA) were used to perform placental localization on 48 pregnant women with antepartum hemorrhage. The level of diagnostic accuracy of 85% compares favorably with more expensive methods. The false-negative diagnosis rate for the whole group was 4% and the false-positive diagnosis rate was 8%. The authors recommend this method of isotope placentography for developing countries because the cost of the equipment, including maintenance, and the isotopes is relatively small, and the radiation hazards are negligible.

Adult↗

PubMed1976

Correlation of ultrasonic and soft tissue xray placentography in 300 cases.

Three hundred cases in which both ultrasonic and soft tissue placentography examinations had been done are correlated with each other and the clinical findings. These are grouped in two series, one in 1972-1973 and the other 1973-1974. The accuracy rate for both methods was 95 per cent. Outright errors were 2 per cent, and cases in which correlation was lacking for reasons other than diagnostic errors were 3 per cent. Reasons for this lack of correlation are discussed and illustrated. Seven examples of the ascending (or migrating) placenta were also found and an illustrative case is described.

False Negative Reactions↗

PubMed1964