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Biomedical subjects

B Buttery

Publications and source records attributed to B Buttery.

12 recordsLinked to original sources
PubMed1986

Australia.

Explore the source record for details and available documents.

Australia↗
PubMed1984

The ghost artifact.

A ghost artifact is produced when refraction of an ultrasound beam occurs in one part of a scanning plane. Image duplication or even triplication may result. This may lead to error of diagnosis and measurement. Ghost artifacts are commonly seen in transverse echograms of pelvic organs because the rectus muscle interposed between the transducer and the area of interest is acting as a lens and refracts the ultrasound beam. Three illustrative case reports are presented.

Adult↗
PubMed1983

Evaluation of diagnostic ultrasound as a parameter of follicular development in an in vitro fertilization program.

The ultrasound results in 141 patients through 203 cycles stimulated with clomiphene citrate prior to oocyte collection and in vitro fertilization are analyzed. A wide range in the size and number of follicles was seen. Bivariate analysis of the size of the largest follicle, compared with the time of the spontaneous luteinizing hormone (LH) surge, has shown a highly significant correlation (r = 0.720; P less than 0.001) between these two variables, but the accuracy of prediction of the LH surge in a specific cycle, as expressed by the standard error of estimate, was 34.3 hours. As an isolated observation, ultrasound results are no better than the menstrual history in predicting the time of the LH surge in stimulated cycles. Multiparameter assessment of follicular development is required.

Chorionic Gonadotropin↗
PubMed1981

A clinical assessment of nine pregnancies obtained by in vitro fertilization and embryo transfer.

An analysis of nine pregnancies resulting from in vitro fertilization and embryo transfer was made in order to identify factors common to all of the pregnancies. These factors included clomiphene stimulation; general anesthesia for laparoscopy; identification of large follicles (greater than 8 ml) and a mature oocyte; preincubation of the oocyte for 4.7 to 6.5 hours in vitro before insemination; insemination with 0.8 to 1.3 x 10(6) fresh spermatozoa from fertile samples; transfer to the uterus of two-, four-, and eight-cell embryos, 38 to 50 hours after insemination; and uncomplicated uterine transfers of embryos. It was difficult to determine whether these factors are causal or coincidental in the attainment of successful pregnancies. The detailed analysis was useful in demonstrating factors which did not prevent the establishment of pregnancy by in vitro fertilization and embryo transfer. These factors included a variety of causes of infertility, including idiopathic and male infertility; age of the infertile woman over 35 years; the presence of T-mycoplasma in the genital tract; the use of human chorionic gonadotropin; a variety of agents used for general anesthesia; the use of carbon dioxide to induce pneumoperitoneum; a delay of up to 50 minutes in the interval between the induction of general anesthesia and oocyte recovery; the use of antiprostaglandins at the time of embryo transfer; and a brown discharge from the vagina following embryo transfer.

Embryo Transfer↗
PubMed1979

Occipitofrontal-biparietal diameter ratio. An ultrasonic parameter for the antenatal evaluation of Down's syndrome.

The cephalic index of the fetal head was determined by the ultrasonic measurement of the occipitofrontal-biparietal diameter (OF-BPD) ratio in a pilot study of 53 patients at risk of Down's syndrome. The mean value of the OF-BPD ratio was 1.24, and a linear correlation between the occipitofrontal diameter (OFD) and the biparietal diameter (BPD) was observed. There was one case of Down's syndrome in this series. The fetal head was markedly brachycephalic with an OF-BPD ratio of 1.073. The results of this study suggest that when fetal brachycephaly is present, the probability of Down's syndrome is increased. Further evaluation of this parameter is warranted, as it is possible that this technique may provide a safe, and non-invasive method of screening the entire pregnant population for Down's syndrome.

Adult↗
PubMed1978

The dynamic uterus revealed by time-lapse echography.

The dynamic aspects of the uterus have hitherto gone unrecognized by ultrasonographers. The inherent contractility of the uterus produces dynamic artifacts on static echograms that may lead to serious misdiagnoses. Four cases are presented which illustrated these dynamic changes. Time-lapse echography is proposed as a method of assessing uterine dynamics and improving diagnostic accuracy.

Female↗
PubMed1978

The measurement of abdominal aortic aneurysms.

A study was made of the accuracy of different methods currently used in assessing the transverse diameter of abdominal aortic aneurysms. The maximum transverse diameter of the abdominal aorta was estimated by clinical palpation, plain radiology, ultrasonography and aortography, in a group of 47 patients who were subjected to either a surgical exploration or elective aneurysm resection. The results of these estimations were compared with the actual measurements obtained during the surgical procedure. Measurements of aortic wall calcification seen on the plain X-ray film correlated best with the operative findings. However, calcification was seen in only 30% of the patients. Ultrasonography was almost universally applicable as a technique of assessing aortic size and was found to be a reliable technique for measuring the aortic diameter.

Aorta, Abdominal↗