High-dose versus low-dose of oxytocin for labour augmentation: a randomised controlled trial.

PROBLEM: Delayed labour progress is common in nulliparous women, often leading to caesarean section despite augmentation of labour with synthetic oxytocin. BACKGROUND: High- or low-dose oxytocin can be used for augmentation of delayed labour, but evidence for promoting high-dose is weak. Aim To ascertain the effect on caesarean section rate of high-dose versus low-dose oxytocin for augmentation of delayed labour in nulliparous women. Methods Multicentre parallel double-blind randomised controlled trial (ClinicalTrials.gov: NCT01587625) in six labour wards in Sweden. Healthy nulliparous women at term with singleton cephalic fetal presentation, spontaneous labour onset, confirmed delay in labour and ruptured membranes (n=1351) were randomised to labour augmentation with either high-dose (6.6 mU/minute) or low-dose (3.3 mU/minute) oxytocin infusion. FINDINGS: 1295 women were included in intention-to-treat analysis (high-dose n=647; low-dose n=648). Caesarean section rates did not differ between groups (12.4% and 12.3%, 95% Confidence Interval -3.7 to 3.8). Women with high-dose oxytocin had: shorter labours (-23.4min); more uterine tachysystole (43.2% versus 33.5%); similar rates of instrumental vaginal births, with more due to fetal distress (43.8% versus 22.7%) and fewer due to failure to progress (39.6% versus 58.8%). There were no differences in neonatal outcomes. DISCUSSION: Our study could not confirm results of two systematic reviews indicating, with weak evidence, that use of high-dose oxytocin was associated with lower frequency of caesarean section. CONCLUSION: We found no advantages for routine use of high-dose oxytocin in the management of delay in labour. Low-dose oxytocin regimen is recommended to avoid unnecessary events of tachysystole and fetal distress.

Comparison of the PainMatcher and the Visual Analogue Scale for assessment of labour pain following administered pain relief treatment.

OBJECTIVE: during childbirth, it is necessary to assess and monitor experienced pain and to evaluate the effect of pain relief treatment. The aim of this study was to compare the PainMatcher (PM) with the Visual Analogue Scale (VAS) for the assessment of labour pain and the effect of pain relief treatment. DESIGN: randomised controlled trial. SETTING: labour ward with approximately 2500 childbirths per year in western Sweden. PARTICIPANTS: 57 women with labour pain treated with acupuncture or sterile water injections scored their electrical pain threshold and pain intensity with the PM. Pain intensity was also assessed with the VAS. Electrical pain threshold and pain intensity were assessed immediately after a uterine contraction before and 30, 60, 90, 120, 150 and 180 minutes after treatment. MEASUREMENTS AND FINDINGS: the results showed a weak correlation (r=0.13, p<0.05) between the pain intensity scores on the PM and the VAS. The PM detected changes (decrease) in pain intensity to a lower degree than the VAS. Surprisingly, in over 10% of sessions, women scored their pain intensity during a uterine contraction lower than their electrical pain threshold with the PM. However, electrical pain thresholds with the PM correlated well throughout all measurements. CONCLUSIONS: the PM is a reliable tool for the assessment of electrical pain threshold; however, the VAS is more sensitive than the PM for recording changes in pain intensity when assessing the effects of treatment on labour pain. IMPLICATIONS FOR PRACTICE: the PM and the VAS are not interchangeable in the case of labour pain, and there is still a need for research in this area to find a more suitable assessment instrument for the evaluation of labour pain.

Use and abuse of oxytocin for augmentation of labor.

OBJECTIVE: To investigate the use of oxytocin for augmentation of labor and its relation to labor progress and delivery outcome. DESIGN AND SETTING: A retrospective observational study undertaken in a Swedish hospital during 2000-2001. SAMPLE: Singleton pregnancies at > or = 37 weeks of gestation with cephalic presentation and spontaneous onset of labor. METHODS: Data were collected from 1,263 clinical records. The partogram was used to diagnose labor dystocia (LD). MAIN OUTCOME MEASURES: Prevalence of oxytocin administration, LD and operative delivery. RESULTS: Oxytocin was administered to 55% of the women (75% of primiparas and 38.1% of multiparas); a majority did not meet LD criteria. LD frequency was 19.8% (32.7% in primiparas and 7.4% in multiparas). Oxytocin was started both 'too early' and 'too late' in relation to the diagnosis of LD. Cesarean section (CS) was performed on 17.1% of primiparous and 2.4% of multiparous oxytocin recipients with LD, compared to 2.3 and 1.5%, respectively, of oxytocin recipients without diagnosed LD. CONCLUSIONS: Oxytocin augmentation was undertaken in an unstructured manner; some women were inadequately treated and others were treated unnecessarily. Oxytocin recipients with LD underwent operative delivery to a higher extent than oxytocin recipients without LD, suggesting that the main reason for CS was the underlying problem of LD rather than the oxytocin augmentation itself.

Sterile water injections as treatment for low-back pain during labour: a review.

BACKGROUND: Some women have severe low-back pain during childbirth. It has been shown that sterile water injections reduce this pain. This method, which is easy to learn and very cheap can be a good pain relief alternative primarily in countries with limited available pain relief options. AIMS: The aim of this article was to describe published research concerning sterile water injections for treatment of low-back pain during labour. METHODS: Three databases were searched from their inception until February 2008. The inclusion criteria were trials elucidating the pain relief effect of sterile water injections during childbirth. The search terms were labour, birth, obstetrics, parturient, pregnancy, pain relief, analgesia, injection, papules, blocks and sterile water. The computerised literature searches yielded 64 trials, 55 of which failed to meet our inclusion criteria. We used the Jadad Score Instrument to assess the quality of the remaining nine articles, of which six were of adequate quality. RESULTS: All studies in this review had similar aims, designs and measurement instruments and they reported good pain relief particularly for low-back pain during childbirth. In all studies the pain score reduction is approximately 60% and the effect remains up to two hours. CONCLUSIONS: Sterile water injections seem to be a good alternative for low-back pain during childbirth.

Acupuncture versus subcutaneous injections of sterile water as treatment for labour pain.

BACKGROUND: Two methods for pain relief and relaxation during labour are sterile water injections and acupuncture. In several studies, sterile water injections have been shown to provide good pain relief, particularly for low back pain during labour. The acupuncture studies for pain relief during labour are not as concordant. Therefore, the aim of this study was to explore if there were any differences between acupuncture and sterile water injections regarding pain relief and relaxation during labour. METHODS: A randomised controlled trial. Some 128 pregnant women at term were randomly assigned to receive acupuncture (n=62) or sterile water injections (n=66). The primary endpoint was to compare the differences between pre-treatment pain levels and maximum pain in the 2 groups. RESULTS: The main results of this study were that sterile water injections yielded greater pain relief (p<0.001) during childbirth compared to acupuncture. The secondary outcome showed that women in the sterile water group had a higher degree of relaxation (p<0.001) compared to the acupuncture group. The women's own assessment of the effects also favoured sterile water injections (p<0.001). There were no significant differences regarding requirements for additional pain relief after treatment between the 2 groups. CONCLUSIONS: Women given sterile water injection experience less labour pain compared to women given acupuncture.

Dystocia in labour - risk factors, management and outcome: a retrospective observational study in a Swedish setting.

BACKGROUND: Labour dystocia (LD) is associated with adverse maternal and child outcomes. This study investigated obstetric risk factors, frequency of interventions and delivery outcomes for LD. METHODS: A retrospective, observational, study of 1,480 deliveries was undertaken in a Swedish district hospital during 2000 and 2001. RESULTS: LD was identified in 21% of deliveries, 16.7% of which ended in caesarean section (CS) compared to 1.7% of deliveries without LD. Multiparity with no previous vaginal delivery (OR=6.0), epidural analgesia (EDA) at cervical dilation < or =5 cm (OR=4.6), primiparity (OR=4.5), gestational age > or =42 weeks (OR=3.1), birth weight >4,000 g (OR=2.7) and EDA at cervical dilation >5 cm (OR=2.0) were major independent risk factors for LD. CONCLUSIONS: In delivery management, special attention should be directed to primiparous women and multiparous women with no previous vaginal delivery. Women given EDA, especially at cervical dilation < or =5 cm are also of particular interest. Furthermore, rigorous routines for LD diagnosis and oxytocin augmentation are important.

Early random capillary glucose level screening and multidisciplinary antenatal teamwork to improve outcome in gestational diabetes mellitus.

BACKGROUND: This study describes maternal and neonatal characteristics and delivery outcome in women with gestational diabetes mellitus [GDM], compared to a control group. METHODS: A retrospective observational study of 719 women with GDM was undertaken in a Swedish urban district. All other parturients at the same hospital served as the control group. GDM was diagnosed using random capillary glucose levels at fixed intervals, beginning early in pregnancy. An oral glucose tolerance test was performed at glucose levels>or=7.0 mmol/l (127.8 mg/dl). Data was analysed according to glucose levels at diagnosis, ie, mild or severe GDM. RESULTS: GDM was diagnosed in 2.28% of the women who were older and had higher Body Mass Index [BMI]. A high proportion was of non-Nordic origin (44.5%); they had severe GDM more often (49.1%) than the Nordic group (33.1%). The GDM-mild group had less complications and abnormalities, compared to the GDM-severe group, although both groups differed from the control group in this respect. Delivery was spontaneous in 70.2% of GDM-mild, 65.7% of GDM-severe and 81.0% of the control group. LGA (+2 SD) was found in 4.8, 10.5 and 3.2%, respectively. CONCLUSION: Early non-fasting random universal screening and multidisciplinary antenatal teamwork intervention seems to be favourable, with low rates of excessive fetal growth, instrumental vaginal delivery and caesarean section.

Use of acupuncture and sterile water injection for labor pain: a survey in Sweden.

BACKGROUND: Acupuncture and sterile water injections are nonpharmacological pain relief methods used for labor pain in Swedish delivery wards. Their use has changed over time, the reasons for which are unclear, and acupuncture is currently in more common use than sterile water injections. The aim of this study was to elucidate the clinical use of acupuncture and sterile water injections as pain relief and relaxation during childbirth in Sweden. METHODS: Twelve hundred questionnaires were sent out to all delivery wards in Sweden. Nine hundred sixty midwives fulfilled the inclusion criteria, and the response rate was 565 (59%). RESULTS: Acupuncture was used for both pain relief and relaxation, whereas sterile water injections were used almost exclusively for pain relief. The midwives' own choice of pain relief during childbirth for a possible future delivery was similar to their choice of method in clinical practice. CONCLUSIONS: Our study shows that acupuncture was used for both pain relief and relaxation, whereas sterile water injections were used almost exclusively for pain relief. The results also indicate a weakness in midwives' awareness and use of scientific knowledge and general recommendations about these methods.

Sympathetic nerve activity after acupuncture in humans.

The aim of the present study was to determine if acupuncture stimulation inhibits sympathetic nerve activity in humans. Multiunit efferent postganglionic sympathetic activity was recorded with a tungsten microelectrode inserted in a muscle fascicle of the peroneal nerve. Mean arterial pressure, heart rate and skin blood flow were also monitored. Pain thresholds were measured by electrical tooth pain stimulation. After a 30 min rest, acupuncture needles were inserted bilaterally into the Li 11 and the Li 4 acupuncture points, and manipulated until 'chi' cramp-like sensation was reported. Electrical stimulation (2 Hz, 0.6-0.8 ms duration, maximal tolerated stimulation without discomfort) was delivered for 30 min and the physiological recordings were continued for 90 min after the end of acupuncture. In a placebo control experiment, the same procedure was followed, except that acupuncture needles were inserted subcutaneously and no manipulation or stimulation was given. The stimulator delivered pulses to an unconnected channel, hence, the same audiovisual stimuli were experienced as with acupuncture, and care was taken to ask the same questions about sensations in the placebo and the acupuncture groups. Electroacupuncture produced an increase in pain threshold which was paralleled by a transient increase in muscle sympathetic nerve activity. During acupuncture, there was a small increase in heart rate and mean arterial pressure, but there was no post-acupuncture hypotension. The placebo control procedure did not change pain threshold or sympathetic nerve traffic. The findings suggest that electroacupuncture produces moderate hypoalgesia in humans paralleled by a significant increase in muscle sympathetic nerve activity.

Noradrenaline-evoked pain in neuralgia.

We have tested the effects of cutaneous application of noradrenaline in 35 patients presenting with neuropathic pain. Depending on the outcome of sympatholytic interventions the patients were considered to have sympathetically maintained pain (SMP; n = 25) or sympathetically independent pain (SIP; n = 10). Iontophoretic application or cutaneous injection of noradrenaline into symptomatic skin aggravated pain and mechanical or thermal hyperalgesia in 7/25 SMP patients. Results from differential nerve blocks suggested that noradrenaline-induced ongoing pain and heat hyperalgesia were signalled by unmyelinated afferents, while touch-evoked pain and cold hyperalgesia were signalled by myelinated afferents. In none of the remaining 18/25 SMP patients, 10 SIP patients or 18 normal subjects did application of noradrenaline result in any appreciable increase of pain. A follow-up of 12 patients (initially 9 SMP, 3 SIP) after 12-16 years showed that one individual (previously SMP) was healthy, while 3 patients still suffered from SMP and 8 from SIP. Of the 5 SMP patients who had noradrenaline-induced pain at the initial examination, only 1 SMP patient still responded to noradrenaline with pain and hyperalgesia. Three other patients had changed to SIP and 1 individual was healthy. None of these 4 and none of the 7 initially noradrenaline-unresponsive patients experienced pain to the noradrenaline challenge at follow-up. Thus, cutaneous noradrenaline application can aggravate the pain in some, but not all SMP patients. THe abnormal noradrenaline reaction can change over time as can the pain relieving effects of sympatholytic therapy.

Do patients with primary fibromyalgia have an altered muscle sympathetic nerve activity?

This study was performed to test the existing notion that an increased muscle sympathetic nerve discharge is part of the underlying mechanism for the chronic pain syndrome of primary fibromyalgia. Muscle sympathetic nerve activity was recorded in the peroneal nerve in eight patients with primary fibromyalgia and eight age-matched controls. No difference in baseline sympathetic activity was observed between patients and controls. Furthermore, patients did not show exaggerated sympathetic nerve responses to static handgrip or jaw muscle contractions, postcontraction ischemia or mental stress. Thus the results do not indicate muscle sympathetic nerve overactivity in primary fibromyalgic patients.

Parturition pain treated by intracutaneous injections of sterile water.

Forty-five pregnant women in the first stage of labour presenting with lower back pain were randomized into 2 groups. One group received intracutaneous injections of sterile water in the lumbosacral region, while the other group was given corresponding subcutaneous injections of isotonic saline, regarded as a placebo treatment. In the group that received intracutaneous sterile water injections the mean VAS score was significantly more reduced compared to the placebo group at 10 min (P less than 0.001), 45 min (P less than 0.02), and at 90 min (P less than 0.05) after the treatment. The midwives' blind estimation of the effectiveness of treatment was consistent with the VAS assessment. However, the requirement of pethidine (meperidine) was similar in the 2 groups. The analgesic method presented was found to be an effective treatment against lower back pain during the first stage of labour and it is speculated that the mode of action resembles acupuncture.