The use of STAN monitoring in the labour ward.

Continuous intrapartum cardiotocography (CTG) augmented by fetal ECG ST segment analysis (STAN) has the potential to reduce the rates of neonatal metabolic acidosis and obstetric interventions. STAN was introduced at Ninewells Hospital, Dundee in October 2007. Data were collected prospectively from all women who received continuous intrapartum CTG and STAN between 1 October 2007 and 31 March 2008. A total of 253 women had continuous CTG and STAN. The median number of ST events was one (range = 1-32). Most (556/719, 77%) ST events were associated with a normal CTG; 46/144 (32%) patients with an ST event required immediate action. Three of the 253 (1.2%) women were delivered based on an ST event with a normal CTG; four (1.5%) had severe neonatal metabolic acidosis and all four cases had intrapartum ST events and were not managed according to STAN guidelines. ST events are common but the majority of ST events require no action. The high incidence of false-positive ST events might have contributed to the failure to act when a significant ST event occurred.

An audit of neonatal respiratory morbidity following elective caesarean section at term.

UNLABELLED: Studies have suggested that a reduction in neonatal respiratory morbidity may be achieved by delaying elective caesarean section until 39 weeks gestation. In 1997 staff at the Glasgow Royal Maternity Hospital were concerned at the level of neonatal respiratory morbidity following elective caesarean section. AIMS: To determine the extent of neonatal respiratory morbidity following elective caesarean section at term. Then to present the findings, make recommendations and perform a repeat analysis. METHODS: A retrospective analysis of all elective caesarean sections at term between October 1996 and October 1997 was performed. Labour ward, operating theatre and SCBU records were examined, followed by maternal and infant case note review. The gestational age at the time of caesarean section and any neonatal respiratory morbidity was recorded. The results were subsequently presented at a perinatal morbidity meeting and a recommendation made to delay elective sections until 39 weeks gestation. The audit was repeated between June 1999 and June 2000. RESULTS: The first cycle of the audit showed significantly lower rates of neonatal admissions with advancing gestation (p < 0.001). There was also a reduction in the number of infants requiring oxygen (p = 0.001), the number of infants requiring intensive care admission (p = 0.001) and ventilation (p = 0.003) with advancing gestation. In the second cycle of the audit there was a significant decrease in the number of elective caesarean sections performed prior to 39 weeks gestation (51% vs. 26%) (p < 0.0001). There were fewer neonatal admissions with respiratory morbidity between the two phases of the audit (26/292 vs. 18/327) (RR = 0.62, 95% CI 0.34-1.1). There was also a reduction in the number of infants requiring oxygen (RR = 0.5, 95% CI 0.23-1.06) the number of infants requiring intensive care admission (RR = 0.45, 95% CI 0.15-1.29) and the number of infants requiring ventilation (RR = 0.38, 95% CI 0.1-1.47). CONCLUSION: A reduction in neonatal respiratory morbidity can be achieved by delaying elective caesarean section until 39 weeks gestation.

Vaginal application of the nitric oxide donor isosorbide mononitrate for preinduction cervical ripening: a randomized controlled trial to determine effects on maternal and fetal hemodynamics.

OBJECTIVE: Our aim was to assess the effects of vaginally administered isosorbide mononitrate (a nitric oxide donor) on maternal and fetal hemodynamics in pregnant women at term. STUDY DESIGN: We conducted a randomized controlled trial. Women were randomly selected to receive vaginally administered isosorbide mononitrate, 20 mg (n = 13) or 40 mg (n = 11), or to undergo a vaginal examination only (n = 12). Maternal pulse, blood pressure, and fetal heart rate were recorded at baseline and then every 30 minutes until 360 minutes. Umbilical artery resistance index and pulsatility index measurements were performed at 0, 180, and 330 minutes. RESULTS: Maternal pulse rate was greater after the administration of isosorbide mononitrate, 20 or 40 mg, compared with the pulse rate in the vaginal examination-only group (greatest difference in means, 21 beats/min; P <.01). Maternal systolic and diastolic blood pressures were greater in the 20-mg and 40-mg isosorbide mononitrate groups than in the vaginal examination-only group (greatest difference in mean systolic and diastolic blood pressure, 15 and 16 mm Hg, respectively; P <.02 and P <.001, respectively). Fetal heart rate was greater in the 40-mg isosorbide mononitrate group than in either the 20-mg isosorbide mononitrate group or the vaginal examination-only group (difference in mean, 15 beats/min; P <.05). No woman required treatment for maternal or fetal tachycardia or maternal hypotension. Neither dose of isosorbide mononitrate had a significant effect on umbilical artery resistance or pulsatility index. CONCLUSIONS: Vaginal administration of 20 or 40 mg isosorbide mononitrate to pregnant women at term has an effect on both maternal and fetal hemodynamics, but this effect is not clinically significant.

Association of reduced selenium status in the aetiology of recurrent miscarriage.

OBJECTIVE: To determine whether recurrent miscarriage is associated with reduced selenium status. DESIGN: Case-control study. SETTING: Department of Obstetrics and Gynaecology, Glasgow Royal Infirmary and Glasgow Royal Maternity Hospital. POPULATION: Twenty nonpregnant women with a history of unexplained recurrent miscarriage, and 47 nonpregnant parous women with a history of at least one successful pregnancy and no more than one miscarriage. METHODS: A 7 mL blood sample from each woman was collected into lithium heparin 'vacutainer' tubes. Samples were centrifuged at 3000 g for 15 minutes, and plasma was extracted and stored at -20 degrees C. Selenium concentrations were measured using a fluorescence spectrophotometer. The selenium concentrations in the two groups were compared and the differences examined using the Student's t test. MAIN OUTCOME MEASURES: Plasma selenium concentration (microg/L). RESULTS: The mean selenium concentration for women with a history of unexplained recurrent miscarriage was 67.7 microg/L (SD 16.4). The selenium level for the women with no history of recurrent miscarriage was 70.3 microg/L (SD 12.7). There was no difference in selenium concentrations between the two groups (P = 0.53). CONCLUSIONS: In this study there is no association between unexplained recurrent miscarriage and reduced selenium status, implying that reduced selenium status is not a factor in the pathogenesis of recurrent miscarriage. We can find no rationale for a trial of selenium therapy in women with a history of recurrent miscarriage.

Kinetics of 13CO2 elimination after ingestion of 13C bicarbonate: the effects of exercise and acid base balance.

In order to investigate the effects of muscular work and preceding exercise on the retention of exogenous labelled bicarbonate, we studied the effects of oral administration of [13C]bicarbonate (0.1 mg kg-1) in five subjects at rest before exercise and during and after 1 h of treadmill walking at 73% VO2max on three separate occasions. Elimination of CO2 from labelled bicarbonate was 62.6 +/- 8.1% at rest, 103.6 +/- 11.3% during exercise (P < 0.01) and 43.0 +/- 4.7% during recovery from exercise (P = 0.01). During exercise mean residence time (MRT) was shorter than at rest (35 +/- 7 min vs. 54 +/- 9 min, P < 0.02) and CO2 pool size was larger (998 +/- 160 ml CO2 kg-1, vs. 194 +/- 28 ml CO2 kg-1, P < 0.001). Compared to values obtained at rest, during recovery from exercise, MRT and CO2 pool size were reduced (34 +/- 5 min, P < 0.05; 116 +/- 19 ml CO2 kg-1, P < 0.02, respectively). In an additional five subjects acidosis and alkalosis were induced prior to administration of oral [13C]bicarbonate at rest. Elimination of bicarbonate was lower during acidosis (46.1 +/- 5.6%, P < 0.01) but was unaltered (50.9 +/- 5.6%, NS) during alkalosis, compared to the values obtained at resting pH. During acidosis MRT and CO2 pool size decreased (37 +/- 3 min, P < 0.01 and 123 +/- 10 ml CO2 kg-1, P < 0.01, respectively) whereas in alkalosis MRT was unchanged (65 +/- 8 min NS) but CO2 pool size was increased (230 +/- 23 ml CO2 kg-1, P < 0.05).(ABSTRACT TRUNCATED AT 250 WORDS)