To the Editor: Austin et al1 bring to our attention findings from the report on maternal deaths in Australia in which 26 suicides were reported, making it one of the leading causes of indirect maternal deaths in the perinatal period — a finding consistent with the Confidential Enquiries into Maternal Deaths report from the United Kingdom.2 These reports raise the issue of the importance and risk of maternal mental illness in the perinatal period.

While this high rate of suicide is unacceptable, it needs to seen in context: this is a rare event overall, representing a standardised mortality ratio of 1.14 per 100 000 women. This is considerably lower than the suicide rate for women in general, which ranges from 3.6 per 100 000 in the 15–19-year age group to 6.4 per 100 000 in the 25–29-year age group.2,3 This comparison verifies the observation made by Appleby that suicide rates are low during the perinatal period.4

Austin et al recommend that psychosocial screening, in conjunction with ongoing mental health monitoring and clear referral pathways, should be made available to women in a maternity setting as part of the solution to preventing the “relatively high” rate of early maternal suicide. But to date, antenatal screening programs have proven costly to implement, can produce large numbers of false positives, are often poorly accepted by antenatal care providers (as they add to the administrative burden), and do not result in greater uptake of services by at-risk women.5

Remarkably, 40% of the suicides reported by Austin et al occurred in the first trimester, predominantly before women had attended an antenatal clinic and before any psychosocial screening. A number of the suicide cases were already under the care of mental health services, and screening may not have prevented the tragic outcomes.

We believe the answer to this problem is for appropriately resourced, accessible and publicly funded specialised perinatal psychiatric services to be put in place (including dedicated mother and baby units) so that high-risk women can be appropriately treated. In providing such services, we would need to develop appropriate strategies to engage mothers who need support from psychiatric services. This concurs with the National Institute for Health and Clinical Excellence perinatal mental illness guidelines,6 which advocate for the identification of pertinent risk factors (such as personal and familial mental health history) and assessment of current distress (through targeted interviewing). Screening is recommended to monitor outcomes but not to dictate clinical decision making.

In reply: Boyce and Barton raise a number of points.

Firstly, with respect to their critique of the 2006 beyondblue postnatal depression report,1 there are, to date, no studies assessing the cost of antenatal screening programs. Furthermore, while false positives are a feature of all screening programs, that, in itself, is not a deterrent to using antenatal screening if the rate of false positives is considered acceptable. While midwives have concerns about undertaking routine psychosocial assessment, uptake of such a program can be done through adequate training and support of staff, as now demonstrated in a number of sites around Australia.2 With respect to the inadequate uptake of services by “high-risk” women, these are generally poor in the psychiatric clinic setting3 and would not be expected to be different perinatally.

Secondly, the authors report that “a number of the suicide cases were already under the care of mental health services, and screening may not have prevented the tragic outcomes”. This overlooks one of the key attributes of routine psychosocial assessment in the primary health care setting — that it encourages communication and monitoring across the primary (eg, midwifery) and mental health sectors. Thus, while some women may be lost to psychiatric follow-up during pregnancy, most will attend antenatal appointments, thus providing their health care network with an opportunity for ongoing psychosocial review.

Thirdly, while we agree with Boyce and Barton that “targeted interviewing” (as described in the UK National Institute for Health and Clinical Excellence guidelines) is important, “psychosocial assessment”, as undertaken in some Australian maternity settings, aims to assess the broad number of psychosocial risk factors that may contribute to the mental health outcomes of a woman and her infant. This point has been identified as a key issue in the 2007 beyondblue national action plan for perinatal mental health briefing document.4