Finding the most accurate method to measure head circumference for fetal weight estimation.

OBJECTIVE: Accurate measurement of fetal head biometry is important for fetal weight estimation (FWE) and is therefore an important prognostic parameter for neonatal morbidity and mortality and a valuable tool for determining the further obstetric management. Measurement of the head circumference (HC) in particular is employed in many commonly used weight equations. The aim of the present study was to find the most accurate method to measure head circumference for fetal weight estimation. STUDY DESIGN: This prospective study included 481 term pregnancies. Inclusion criteria were a singleton pregnancy and ultrasound examination with complete fetal biometric parameters within 3 days of delivery, and an absence of structural or chromosomal malformations. Different methods were used for ultrasound measurement of the HC (ellipse-traced, ellipse-calculated, and circle-calculated). As a reference method, HC was also determined using a measuring tape immediately after birth. FWE was carried out with Hadlock formulas, including either HC or biparietal diameter (BPD), and differences were compared using percentage error (PE), absolute percentage error (APE), limits of agreement (LOA), and cumulative distribution. RESULTS: The ellipse-traced method showed the best results for FWE among all of the ultrasound methods assessed. It had the lowest median APE and the narrowest LOA. With regard to the cumulative distribution, it included the largest number of cases at a discrepancy level of ±10%. The accuracy of BPD was similar to that of the ellipse-traced method when it was used instead of HC for weight estimation. CONCLUSION: Differences between the three techniques for calculating HC were small but significant. For clinical use, the ellipse-traced method should be recommended. However, when BPD is used instead of HC for FWE, the accuracy is similar to that of the ellipse-traced method. The BPD might therefore be a good alternative to head measurements in estimating fetal weight.

Effectiveness of nitrous oxide for postpartum perineal repair: a randomised controlled trial.

OBJECTIVE: To compare the effectiveness of self-administered 50% nitrous oxide and conventional infiltrative anaesthesia with 1% prilocaine hydrochloride in postpartum perineal repair. STUDY DESIGN: A total of 100 women were prospectively enrolled and randomised to receive either infiltrative anaesthesia or a self-administered nitrous oxide mixture (Livopan(©)) for pain relief during postpartum perineal suturing. Besides data concerning anaesthesia, characteristics of patients and labour were documented for statistical analysis. Pain experienced during perineal repair was assessed using the short form of the McGill Pain Questionnaire (SF-MPQ). RESULTS: Forty-eight women received nitrous oxide and 52 underwent perineal suturing after infiltrative anaesthesia. There were no statistically significant differences regarding maternal age, body mass index (BMI), duration of pregnancy and suturing time between the groups. The most frequent birth injury was second-degree perineal laceration in the study group [22/48; 46%] and episiotomy in the control group [18/52; 35%]. Pain experienced during genital tract suturing and patients' satisfaction showed no statistically significant differences between the groups. Thirty-seven women in the study group and 47 in the control group were satisfied with the anaesthesia during perineal repair and would recommend it to other parturients [37/48, 77% vs. 47/52, 90%; p=0.0699). CONCLUSION: Nitrous oxide self-administration during genital tract suturing after vaginal childbirth is a satisfactory and effective alternative to infiltrative anaesthesia.

Cervical dilatation and curettage in elective caesarean section. A retrospective analysis.

BACKGROUND/AIM: To analyze the influence of intraoperative cervical dilatation and curettage during elective Caesarean section (CS) on maternal morbidity. PATIENTS AND METHODS: A total of 1,003 elective CS were retrospectively evaluated. Primary outcome measure was the influence of cervical dilatation and curettage on postpartum haemorrhage (PPH). Several subgroup analyses were performed and a multiple logistic regression model was used in order to identify risk factors affecting PPH. RESULTS: Multiple pregnancy (p=0.0025) and body mass index (p=0.0251) were identified as risk factors for PPH. Curettage, cervical dilatation, prior CS, age, and duration of pregnancy were statistically not significant at a level of α=0.10. There was a significantly higher proportion of women suffering from uterine sub-involution when the cervix was dilated (p=0.0482). The operating time was significantly longer when curettage and/or dilatation were performed (p<0.0001). CONCLUSION: Routine cervical dilatation and/or curettage in elective Caesarean section are not beneficial. Accomplishment of either or both of these measures led to a prolonged operating time, without improving the postoperative outcome.