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排序方式: 共有136条查询结果,搜索用时 250 毫秒
91.
92.
Mark P. Umstad Hugh P. Robinson MD FRCOG FRACOG DDU Lachlan Ch de Crespigny MD MRCOG FRACOG DDU Andrew C. Ngu MRCOG FRACOG DDU 《The Australian & New Zealand journal of obstetrics & gynaecology》1988,28(3):166-168
The first 100 patients undergoing first trimester transabdominal chorionic villus sampling (placental biopsy) in our hospital are reviewed. At the time of follow up 24 patients had delivered, 68 pregnancies were at 24 weeks or more and progressing normally, 7 pregnancies were terminated and there was only 1 spontaneous miscarriage. The advantages of the transabdominal approach are discussed. 相似文献
93.
Alexander J. De Crespigny Michael F. Wendland Nikita Derugin Zinaida S. Vexler Michael E. Moseley 《Journal of magnetic resonance imaging : JMRI》1993,3(3):475-481
Deoxygenated blood was effectively used as a magnetic resonance (MR) susceptibility contrast agent to distinguish perfused and nonperfused (ischemic) regions in a focal ischemia model in cat brain at 2 T. Modulation of cerebral blood oxygenation levels in response to apnea was followed in real time with T2*-weighted (gradient-recalled) echo-planar MR imaging. Signal loss in the T2*-weighted images occurred only in perfused tissues as blood became globally deoxygenated. These data complemented information from diffusion-weighted and contrast agent bolus–-tracking images. In addition, observation of the signal recovery behavior on reventilation in both normal and ischemic brain offered potentially useful information about the state of the cerebral autoregulatory mechanism. 相似文献
94.
A critical review of the ultrasound features of neonatal intracranial anatomy is undertaken. Particular attention is paid to the ventricular and paraventricular region because of their importance in the diagnosis of cerebroventricular hemorrhage. A technique to visualize the important areas is described 相似文献
95.
Alex J. De Crespigny Michael P. Marks Dieter R. Enzmann Michael E. Moseley 《Magnetic resonance in medicine》1995,33(5):720-728
The principal barrier to clinical application of diffusion-weighted MR imaging is the severe image degradation caused by patient motion. One way to compensate for motion effects is the use of a “navigator echo” phase correction scheme. In this work, a modification of this technique is introduced, in which the phase correction step is performed in the frequency domain (i.e., after the readout Fourier transform). This significantly improves the robustness of the navigator echo approach and, when combined with cardiac gating, allows diagnostic quality diffusion-weighted images of the brain to be routinely obtained on standard clinical scanner hardware. The technique was evaluated in phantom studies and in 23 humans (3 normal volunteers and 20 patients). Diffusion anisotropy and apparent diffusion coefficient maps were generated from the image data and showed decreased apparent diffusion in acute stroke lesions and, in several cases, increased apparent diffusion in chronic stroke lesions. 相似文献
96.
A J De Crespigny M F Wendland N Derugin E Kozniewska M E Moseley 《Magnetic resonance in medicine》1992,27(2):391-397
Gradient-recalled echo-planar (T2*-weighted) imaging was used to noninvasively monitor regional blood oxygenation state changes in real time during transient episodes of focal ischemia in cat brain. Varying ischemic intervals (12 s to 30 min) were caused by middle cerebral artery occlusion. A rapid signal drop was noted upon occlusion, due to deoxygenation of static blood in the ischemic tissues. Upon successful reperfusion, the signal intensity recovered immediately and increased above (overshot) the baseline level before slowly returning to normal. The "overshoot" response was strongly dependent on the duration of the ischemic interval and is thought to reflect reactive hyperemia. 相似文献
97.
L J Murton W W Butt R J Mackay R N Roy L C De Crespigny 《Australian paediatric journal》1985,21(1):39-43
In a population of 225 very low birthweight infants born over a 21 month period the cerebroventricular system was scanned by ultrasound. One third of the infants developed a periventricular haemorrhage; in 41% of infants the haemorrhage was detected before an hour of age and 66% of all haemorrhages occurred within the first 24 hours. Statistically significant associations with periventricular haemorrhage included vaginal delivery, endotracheal intubation and intravenous sodium bicarbonate when this was administered in the first 24 hours. In a stepwise regression analysis, however, these and other potentially significant variables added little to the total accountable variance. A similar analysis of perinatal factors and mortality revealed that decreasing gestation was the major association with death. 相似文献
98.
99.
A.J. Sampson FRACOG COGUS DDU M. Permezel MD MRCP MRCOG FRACOG L.W. Doyle MD FRACP L. de Crespigny MD FRACOG COGUS DDU A. Ngu FRACOG COGUS DDU H. Robinson MD FRCOG FRACOG COGUS DDU 《The Australian & New Zealand journal of obstetrics & gynaecology》1994,34(2):125-130
Summary: The results of the first 10 years' experience in ultrasound-guided fetal intravascular transfusions at the Royal Women's Hospital were reviewed. Since the first transfusion, a variety of techniques have been employed in 78 fetuses, all with severe erythroblastosis. A total of 288 intrauterine transfusions have been attempted with an overall survival rate of 75.6% (59 of 78). The overall survival rate for delivered fetuses improved from 64.3% (18 of 28) in 1984–1987, to 82.0% (41 of 50) in 1988–1993. There was a total of 33 hydropic fetuses, of whom 20 (60.6%) survived, significantly fewer compared with 86.7% (39 of 45) of the nonhydropic fetuses (odds ratio {OR] 0.25, 95% confidence interval [CI] 0.09 to 0.70, p <.01). Fetuses who were sicker at the time of transfusion, as reflected by larger haemoglobin deficits, had lower survival rates, as did those requiring transfusions at earlier gestational ages. When these variables were allowed for, the survival rate significantly improved over time (OR 6.3, 95% CI 1.3 to 30.4, p<0.05), probably reflecting the increased skill of the ultrasonologists, but the presence of hydrops per se was no longer important. Variations of the technique employed, such as exchange or intraperitoneal transfusion, or different sites for transfusion, were not significantly related to survival. Ultrasound-guided fetal intravascular transfusions are associated with good fetal outcome, even in the most severe cases of erythroblastosis. 相似文献
100.