摘要:

The value of the Rossavik growth model [P=c(t)k + s(t)] was evaluated in 39 patients with singleton pregnancy who had neonatal weight outcome above the 90th percentile of our birth weight distribution for gestational age. Individual fetal growth curve standards for head and abdominal circumferences, femur diaphysis length, and weight were determined from the data of two scans obtained before 26.1 weeks' gestation and separated by an interval of at least 5 weeks. Projected crown-heel lengths were calculated from projected femur diaphysis length values. Comparisons between actual and predicted birth characteristics were expressed by the Growth Potential Realization Index (GPRI) and Neonatal Growth Assessment Score (NGAS). Excessive growth at birth was seen in almost all cases as indicated by high GPRI for weight and abdominal circumference and abnormal NGAS values. In eight of the 33 patients who delivered after 38 weeks, excessive growth was detected only by comparing birth characteristics to their predicted values at 38 weeks' gestation. Our data suggest that individual growth curve standards may identify several patterns of excessive fetal growth that could represent different pathophysiologic mechanisms, ie, failure to terminate growth after 38 weeks versus a defect in a still unknown growth regulator. The individual fetal growth curve standards method gives additional information and discriminates well between normal and excessive fetal growth.

ISSN:0029-7844    

出版商:OVID    

年代:1991

数据来源: OVID

摘要:

In 458 consecutive chorionic villus sampling (CVS) procedures, we observed a significant influence of uterine position upon sampling efficacy. Compared with anteverted (N= 243) or axial (N= 149) locations, the retroverted uterus (N= 66) was associated with a lower mean sample weight per aspiration (22, 18, and 15 mg, respectively;P< .01) and a greater frequency of multiple-pass procedures (23, 31, and 52%, respectively;P< .0001). To improve sampling efficiency in selected cases of uterine retroversion, we adopted a transvesical approach. When compared with transabdominal or transcervical techniques, transvesical CVS had the highest single-pass success rate (33,33, and 60%, respectively). Only one in 30 transvesical cases required three placental passes, compared with nine of 36 retroverted uteri sampled by either transabdominal or transcervical techniques (P< .05). The mean transvesical sample weight was 18.7 mg; at least 10 mg was retrieved in all cases. Post-procedure bleeding occurred in four instances and an additional patient suffered a spontaneous loss at 16 weeks' gestation. Aneuploidy was found in four of 30 biopsy specimens, and the remaining pregnancies either have delivered at term (N= 18) or are continuing (N= 7). Our preliminary experience suggests that selected use of this CVS method may improve sampling efficiency without increasing the incidence of complications.

ISSN:0029-7844    

出版商:OVID    

年代:1991

数据来源: OVID

摘要:

We compared the performance of Testpack Chlamydia to tissue culture isolation for detection of endocervical chlamydia in an obstetric clinic population at high risk for infection. Among 227 evaluable patients, 30 tissue culture-confirmed chlamydial infections were found (13.2%). The sensitivity, specificity, and positive and negative predictive values of Testpack compared with tissue culture isolation were 66.7, 95.4, 69.0, and 94.9%, respectively. This test can be performed on a desktop within 30 minutes by staff with limited laboratory experience and no special equipment. Based upon our preliminary experience, we believe that Testpack Chlamydia offers promise as a screening device for the detection of endocervical chlamydial infections in highrisk obstetric populations.

ISSN:0029-7844    

出版商:OVID    

年代:1991

数据来源: OVID

ISSN:0029-7844    

出版商:OVID    

年代:1991

数据来源: OVID

ISSN:0029-7844    

出版商:OVID    

年代:1991

数据来源: OVID

ISSN:0029-7844    

出版商:OVID    

年代:1991

数据来源: OVID

ISSN:0029-7844    

出版商:OVID    

年代:1991

数据来源: OVID

ISSN:0029-7844    

出版商:OVID    

年代:1991

数据来源: OVID

ISSN:0029-7844    

出版商:OVID    

年代:1991

数据来源: OVID