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Randomised controlled trial of midwife led debriefing to reduce maternal depression after operative childbirth

Rhonda Small, research fellow ^a, Judith Lumley, professor ^a, Lisa Donohue, research midwife ^b, Anne Potter, research midwife ^a, Ulla Waldenström, professor ^c. 

^a Centre for the Study of Mothers' and Children's Health, School of Public Health, La Trobe University, Carlton Vic 3053, Australia, ^b Graduate Clinical School of Midwifery and Women's Health, School of Nursing, La Trobe University, ^c Department of Nursing, Karolinska Institute, Box 286, S-171 77 Stockholm, Sweden

Correspondence to: R Small r.small{at}latrobe.edu.au

	Abstract

Top Abstract Introduction Participants and methods Results Discussion References

Objective: To assess the effectiveness of a midwife led debriefing session during the postpartum hospital stay in reducing the prevalence of maternal depression at six months postpartum among women giving birth by caesarean section, forceps, or vacuum extraction.
Design: Randomised controlled trial.
Setting: Large maternity teaching hospital in Melbourne, Australia.
Participants: 1041 women who had given birth by caesarean section (n= 624) or with the use of forceps (n= 353) or vacuum extraction (n= 64).
Main outcome measures: Maternal depression (score 13 on the Edinburgh postnatal depression scale) and overall health status (comparison of mean scores on SF-36 subscales) measured by postal questionnaire at six months postpartum.
Results: 917 (88%) of the women recruited responded to the outcome questionnaire. More women allocated to debriefing scored as depressed six months after birth than women allocated to usual postpartum care (81 (17%) v 65 (14%)), although this difference was not significant (odds ratio=1.24, 95% confidence interval 0.87 to 1.77). They were also more likely to report that depression had been a problem for them since the birth, but the difference was not significant (123 (28%) v 94 (22%); odds ratio=1.37, 1.00 to 1.86). Women allocated to debriefing had poorer health status on seven of the eight SF-36 subscales, although the difference was significant only for role functioning (emotional): mean scores 73.32 v 78.98, t= 2.31, 95% confidence interval 10.48 to 0.84).
Conclusions: Midwife led debriefing after operative birth is ineffective in reducing maternal morbidity at six months postpartum. The possibility that debriefing contributed to emotional health problems for some women cannot be excluded.

	Introduction

Top Abstract Introduction Participants and methods Results Discussion References

Operative birth has been associated with considerable maternal morbidity, including depression, guilt, regret, loss of self esteem, prolonged pain, discomfort, infection, grief reactions, feelings of violation, dissatisfaction with care, and occasionally hostility to hospital staff.^1-6 One intervention recommended to reduce morbidity, particularly psychological morbidity, is debriefing.³ Women are given a structured opportunity to discuss their experiences of labour and delivery with an empathic listener shortly after the birth. Debriefing has been recommended as a health promoting strategy for all women after childbirth, in recognition that even an uncomplicated birth can be traumatic ^{7 8} and in the belief that "talking things through" can only prove beneficial. A recent survey of health trusts in England and Wales (response rate 183/211) found that 36% have formal arrangements in place for debriefing women after childbirth and another 26% have plans to introduce such an arrangement (S Marchant, L Davidson, and J Garcia, personal communication).

Outside obstetrics, psychological debriefing after traumatic events has been common for many years, despite the paucity of rigorous research evaluating its effectiveness. ^{9 10} Concerns about the potential for debriefing to do harm have been highlighted in the first systematic review,¹¹ which not only found no evidence of benefit but also reported significantly increased odds of post-traumatic stress disorder at 13 months in patients with burn trauma who had received debriefing.¹²

Only one trial included in the systematic review was in reproductive medicine. This study found that subsequent emotional adaptation after spontaneous miscarriage was not significantly influenced by debriefing.¹³ Two trials of debriefing after childbirth have been reported: one small trial in the United Kingdom reported positive findings for debriefing,⁸ whereas the other, larger trial from Australia found no positive effect.¹⁴ The current study arose from an Australian population based survey that found raised rates of depression eight to nine months postpartum in women who had operative deliveries (adjusted odds ratio= 2.03) compared with women who had spontaneous vaginal deliveries.²

	Participants and methods

Top Abstract Introduction Participants and methods Results Discussion References

Aims
The primary aims were to reduce the prevalence of depression by one third (defined as a score of 13 on the Edinburgh postnatal depression scale¹⁵) six months after the birth, from an expected 24% in the standard care group² to 16% in the debriefing group and to improve overall maternal health (as measured by mean scores on the SF-36 health status measure subscales¹⁶). A secondary aim was to reduce dissatisfaction with postpartum hospital care.

Sample size and study power
The sample size (=0.05, two sided =0.20) required for the primary aim was 416 in each group. We aimed to recruited 1040 women to allow for a 5% refusal rate and a possible loss to follow up of 20%. This sample size was also more than adequate to detect a clinically important reduction in dissatisfaction with postpartum care (from 30% dissatisfied¹⁷ to 20%).

Recruitment
Recruitment took place at one of Melbourne's three teaching hospitals from March 1996 to October 1998. Two research midwives (LD, AP) identified women who had had operative deliveries from the labour ward records and approached women on the postnatal ward at least 24 hours after the birth of their babies. We excluded women who had had stillbirths or babies weighing less than 1500 g, women with insufficient English to take part, women who were ill or whose babies were ill, and women whose private obstetricians had refused permission to approach them.

Randomisation
We used telephone randomisation to allocate women to debriefing or standard care, with allocation determined by separate computer generated, adaptive biased coin randomisation schedules for each research midwife.

Debriefing intervention
The debriefing intervention provided women with an opportunity to discuss their labour, birth, and post-delivery events and experiences. Debriefing took place before the women were discharged from hospital. Both AP and LD are midwives experienced in talking with women about birth, able to listen with empathy to women's accounts, and aware of the common concerns and issues arising for women after an operative birth. Content of the discussion was determined by each woman's experiences and concerns, and up to one hour was made available for the session.

Outcome assessment
The primary outcomes were the prevalence of maternal depression at six months postpartum measured by the Edinburgh postnatal depression scale and overall maternal health status measured by the SF-36. These scales were assessed by a postal questionnaire sent to all participants. We chose to assess depression at six months because we had previously found raised rates of depression in the second half year after operative birth² and because of other evidence of a high incidence of new cases of depression between the third and ninth month postpartum. ^{18 19}

View larger version (18K): [in this window] [in a new window]   Recruitment and participation of women in the trial

Data management and analysis
A coding schedule was developed by three of us (AP, JL, RS) with initial cross checking to ensure coding consistency. Questionnaires were then coded by one of us (AP). Data were double entered and validated. An intention to treat analysis was undertaken with SPSS PC+²⁰ and STATA²¹ statistical packages. We used the recommended cut off for probable depression of 13 on the Edinburgh postnatal depression scale and assessed differences between the trial groups using odds ratios. Mean scores on the SF-36 subscales were compared by Student's t test and 95% confidence intervals. We compared women's views of their postpartum hospital care (ratings of statements about care on a seven point scale) using ordinal logistic regression to provide a cumulative odds ratio that indicated the degree of association between trial group and agreement with the statement over the whole scale.²¹

	Results

Top Abstract Introduction Participants and methods Results Discussion References

Recruitment and participation
Figure 1 summarises recruitment and participation and table 1 outlines the reasons for non-participation. Response rates to the outcome questionnaire were high: 467/520 (90%) women in the debriefing arm and 450/521 (86%) in the standard care arm returned completed questionnaires (total=917, 88% of women recruited). The difference in response rates between the two groups was not significant (odds ratio=1.39, 95% confidence interval 0.94 to 2.07).

Characteristics of study participants
Table 2 shows that the characteristics of the two study groups were comparable after randomisation. Compared with non-respondents, women who returned the outcome questionnaire were more likely to be older, married, better educated, have higher family incomes, to speak English very well if English was not their first language, and to have private health insurance.

Maternal health outcomes
Women allocated to debriefing were not less likely to score as depressed on the Edinburgh postnatal depression scale than women allocated to standard care (table 3). The odds of depression in the debriefing group were raised, although not significantly. The mean scores did not differ significantly between the groups (t=1.17, P=0.24).

Women's views about debriefing and postpartum care
Women were positive about debriefing, with only 26/463 (6%) rating the debriefing session as "unhelpful"; 200 (43%) rated it as "very helpful" and 237 (51%) as "helpful."

Effect of research midwife
We also analysed the primary trial outcomes for each research midwife separately and found no differences. Analysing by research midwife also made no difference to women's views about helpfulness of the debriefing sessions or about postpartum hospital care.

	Discussion

Top Abstract Introduction Participants and methods Results Discussion References

This study contributes to the small number of randomised trials evaluating the effectiveness of debriefing in reducing mental health problems after traumatic events. It supports the systematic summary of current evidence by Wessely and others, which found no beneficial effect of debriefing.¹¹

Nearly all women who experienced debriefing said that they found the session helpful. This finding was also reported in two other trials in which debriefing was found to be ineffective in reducing psychological problems. ^{13 14} Not only did we find that health outcomes for the debriefing group were no better than those for women in the standard care group, we are not able to rule out the possibility that debriefing contributed to poorer emotional health. Women allocated to debriefing were more likely to report that depression had been a problem for them in the six months since the birth, and their SF-36 scores for emotional role functioning were significantly poorer. The non-significant differences on both the Edinburgh postnatal depression scale and the SF-36 were all in the direction of women in the debriefing group faring worse (with the exception of the SF-36 physical functioning subscale).

The UK trial that found a substantial benefit from midwifery led debriefing had several methodological problems.⁸ The study was designed to identify a reduction in the proportion of women scoring above seven on the hospital anxiety and depression scale (from 48% to 24%), but the analysis was of the proportion of women scoring above 10, for which the sample size planned (120) was below that required (292). In standard care more than half of women scored over 10 on both subscales, far more than in the pre-trial pilot. A "disappointment" factor may have increased the scores of women allocated to the control group. Outcome was assessed soon after hospital discharge, and the population was atypical: 59.6% were single women.

The idea that debriefing might be ineffective or even detrimental is not new. Some authors have raised the possibility of "secondary trauma" resulting from re-exposure to the experience during the debriefing session, ^{10 11} and a process of distancing the self from the experience has been suggested to be potentially adaptive.¹³ Timing of the debriefing session, the people involved, the presence or absence of other factors (personality traits, social support, and individual coping styles in response both to distress and to debriefing) may also be important in determining both psychological outcome after trauma and the potential effectiveness of debriefing. ^{9-11 22 23}

Evidence from randomised trials is critical to the resolution of these issues. Ours was a pragmatic trial, and the intervention was designed to be incorporated within standard postpartum care if it proved effective. Debriefing was arranged during the postpartum hospital stay, and we used midwives as "debriefers" because of their predominant role in postpartum care. The use of midwives was also important given concerns that using mental health staff for debriefing might be detrimental, unnecessarily medicalising distress.²⁴ Our findings, however, provide no evidence to recommend debriefing by midwives for women after operative birth as a strategy to reduce subsequent maternal depression or improve women's views of their postpartum care.

	Acknowledgments

We thank all the women who participated in the trial, the nursing and medical staff at the participating hospital for their facilitation of the project, and Lyn Watson for statistical advice and assistance.

Contributors: RS drafted the grant application for the study, participated jointly in protocol design and discussion of core ideas at research team meetings, was the principal investigator for the study in its final two years, conducted the data analysis, and drafted the paper. JL initiated the study, formulated the research questions, contributed to the grant application, participated jointly in protocol design and discussion of core ideas at research team meetings, and contributed to the writing of the paper. LD contributed to the grant application and protocol design, undertook recruitment and conducted the debriefing intervention, participated in data collection and discussion of core ideas at research team meetings, and contributed to the paper. AP contributed to protocol design, undertook recruitment and conducted the debriefing intervention, participated in data collection and discussion of core ideas at research team meetings, coded all the questionnaires, and contributed to the paper. UW participated jointly in protocol design and discussion of core ideas at research team meetings, was the principal investigator for the study in its first two years, and contributed to the paper.

	Footnotes

Funding: Research and development grants advisory committee of the Australian Commonwealth Department of Health, Housing, and Community Services.

Competing interests: None declared.

A table showing women's views of their care is available on the BMJ's website

	References

Top Abstract Introduction Participants and methods Results Discussion References

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(Accepted 12 June 2000)