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Obstetric and neonatal outcomes of pregnant women with severe mental illness at a specialist antenatal clinic

Thinh N Nguyen, Deb Faulkner, Jacqueline S Frayne, Suzanna Allen, Yvonne L Hauck, Daniel Rock and Jonathan Rampono
Med J Aust 2013; 199 (3): S26-S29. || doi: 10.5694/mja11.11152
Published online: 29 October 2013

Abstract

Objective: To evaluate the obstetric and neonatal outcomes of pregnant women with severe mental illness (SMI) who attended a specialist multidisciplinary antenatal clinic in Perth, Western Australia.

Design, setting and participants: A retrospective case-note audit of outcomes from the Childbirth and Mental Illness Antenatal Clinic (CAMI clinic) at King Edward Memorial Hospital for pregnant women with severe mental illness (SMI), aged 18–41 years, who gave birth between December 2007 and April 2011, and their babies.

Main outcome measures: Obstetric and neonatal outcomes for 138 women and newborns from singleton live births. Data were compared between three diagnostic groups (schizophrenia, bipolar and non-psychotic SMI), and with WA obstetric and perinatal statistics for 2008.

Results: 44 women with schizophrenia, 56 with bipolar disorder and 38 with non-psychotic SMI attended antenatal care for an average of 7.7 (SD, 3.3) visits. The proportion of women who smoked tobacco was significantly higher than that in the WA antenatal population (46% v 15%; P < 0.0001). Alcohol use, illicit substance use and psychotropic medication exposure during pregnancy were high. The women were at increased risk of developing gestational diabetes mellitus (15% v 4%; P < 0.0001) and pre-eclampsia (9% v 3%; P < 0.0001), and birth complications were more common. Babies born to CAMI clinic women were less likely to have Apgar scores ≥ 8 at 1 minute and 5 minutes. Pregnant women with schizophrenia had more psychiatric relapses during pregnancy, and had more statutory child welfare involvement. Gestational age at birth and infant birth weights were similar for the pregnant women with SMI and the WA population in 2008.

Conclusions: Women attending our specialist clinic had increased rates of obstetric and neonatal complications compared with the general population, and were exposed to a cluster of risk factors. We report encouraging trends in antenatal attendance, gestational age at birth, and birth weights. Managing pregnant women with SMI will require a comprehensive approach aimed at early detection of obstetric complications and psychosocial difficulties, as well as neonatal monitoring. Optimising prepregnancy maternal health and welfare may also be of benefit.

This is a republished version of an article previously published in MJA Open

Increased morbidity and mortality trends in patients with severe mental illness (SMI), coupled with suboptimal access to health provision,1 highlights the need for comprehensive yet individualised care. Pregnant women with SMI and their babies appear to be a particularly vulnerable group, due to increased risks for obstetric and neonatal complications.2-4 In a Western Australian population study,3 women with schizophrenia and major affective disorders were more likely to experience placental abnormalities and fetal distress. Women with schizophrenia were also more likely to have newborns in the lowest weight/growth decile and have a neonatal narcotic antagonist administered.

Pregnant women with bipolar disorder have been found to be at increased risk of preterm and low-birthweight infants.5,6 Mothers with SMI present with poor maternal condition,7 which is reflected by late presentation to obstetric services and fewer appointments,8,9 poor nutrition, more likelihood of smoking, illicit substance use, and less support.10,11 Additional concerns include antipsychotic exposure during pregnancy, which has been associated with fetal malformation;12 infant growth disruption; increased or decreased birthweight;12,13 and neonatal adjustment difficulties.14

Pregnant women with SMI should be designated as a health disparity population,15 and every effort should be made to improve their access to obstetric care. Within this context, the Childbirth and Mental Illness Antenatal Clinic (CAMI clinic) at King Edward Memorial Hospital (KEMH) was established in 2007. The weekly antenatal clinic comprises a multidisciplinary team of designated obstetrics, midwifery, psychiatry, mental health nursing and social work staff who provide care for pregnant women, in liaison with their treating psychiatrists. This approach has the potential to increase attendance at antenatal care for pregnant women with SMI.16

We report on the obstetric and neonatal outcomes of pregnant women with SMI who attended the CAMI clinic between 2007 and 2011.

Method

A retrospective file audit was made of all pregnant women with SMI who attended the CAMI clinic and gave birth between December 2007 and April 2011. Psychiatric diagnoses were grouped into schizophrenia and related disorders, bipolar disorders, and non-psychotic disorders with significant functional impairment. Diagnoses were made by community mental health services, private psychiatrists or a consultant psychiatrist at KEMH using ICD-10 criteria.17

Data audited from case notes were based on the Western Australian Midwives’ Notification System. The purpose-designed database also included psychiatric diagnoses, detailed demographic information, attendance at the CAMI clinic (including the number of antenatal appointments), psychotropic medication use, and psychosocial outcomes, including psychiatric admissions and statutory welfare agency involvement. The KEMH Ethics Committee approved the study.

Statistical analysis

CAMI clinic data (summary data from all women combined) were compared with obstetric and perinatal data from the Midwives’ Notification System in 200818 using t tests for normally distributed, continuous variables, and the χ2 test for categorical data. Comparisons between CAMI clinic women and the WA population were made using WA singleton pregnancies where data were available (n = 29 805). Our sample size provided 80% power to detect a 3% overall difference in proportions comparing against the WA population. Where WA singleton data were not separately reported, we compared our sample with data for 30 234 pregnancies across the state. Different diagnostic groups within the CAMI clinic data were compared using one-way analysis of variance for normally distributed, continuous variables, the Kruskal–Wallis test for non-normally distributed continuous variables, and the χ2 test for categorical data. Normality was determined using a Kolmogorov–Smirnov test with P < 0.05 considered significant. Proportion of optimal birthweight (POBW) was calculated using the formula in Blair and colleagues.19

Results

One hundred and forty-two CAMI clinic women gave birth between December 2007 and April 2011. Four women had two consecutive pregnancies during this period, two had twin pregnancies, one fetal death occurred, and one pregnancy was terminated due to fetal chromosomal abnormalities. Data presented are the outcomes for 138 women and newborns from first presentation to the clinic to a live singleton birth. Of these, 44 women were diagnosed with schizophrenia, 56 with bipolar disorder and 38 with non-psychotic SMI.

The mean age of the women attending the clinic was 28.9 years (SD, 5.5), which was similar to that of women in the WA population (29.5 years; SD, 5.8). A greater proportion of women was nulliparous (52% v 41%, respectively; P = 0.012), and presented with higher smoking rates (46% v 15.4%, respectively; P < 0.0001). Women with schizophrenia were less likely to have a regular general practitioner recorded, compared with the other diagnostic groups (P = 0.013).

Antenatal care

Among three diagnostic categories of women attending the clinic, maternal age, gestation at first appointment, gravidity, and parity were similar. For all groups, the mean body mass index (BMI) at first antenatal appointment was in the overweight to obese range (mean [SD], 29.1 [6.8]). Among the study women, there was a high rate of alcohol use (19.6%), as well as illicit substance use (25.4%), during pregnancy. Illicit substance use was more prevalent for women with schizophrenia (40.9%) compared with the other two groups (P = 0.006). The women attending our clinic also had high rates of exposure to antipsychotics (mostly atypical) at any time during pregnancy (93.2%, 76.8% and 42.1% for schizophrenia, bipolar and non-psychotic SMI, respectively; P < 0.0001).

In our study, women with a diagnosis of schizophrenia had greater non-attendance to antenatal care than women with bipolar disorder and non-psychotic SMI (mean proportion of appointments attended: 84%, 95%, 92%, respectively; P = 0.02). However, the actual mean numbers of appointments attended were similar across all diagnostic groups (mean appointments attended [SD], 7.7 [3.3]).

Obstetric outcomes

Women attending the CAMI clinic were at increased risk of developing gestational diabetes mellitus (GDM) (15.2% v 4.4%: P < 0.0001), pre-eclampsia (8.7% v 2.7%; P < 0.0001), and threatened preterm labour (6.5% v 2.5%; P = 0.006) compared with women from the general WA obstetric population. Our sample was also less likely to be free of complications of pregnancy (Box 1).

Complications of labour and delivery were more common for women attending the CAMI clinic compared with the 2008 WA population data. In particular, suspected fetal distress was significantly more common (28.3% v 12.6%; P < 0.0001), as was delay to progress (> 3 cm) (21.7% v 5.7%; P < 0.0001). High rates of suspected fetal distress were reflected in the high rates of non-elective (emergency) caesarean births, particularly in the women with schizophrenia (40.9%); however, the overall rate of emergency caesarean was not significantly different (18.8% v 14.9%).

Neonatal outcomes

Neonatal outcomes are shown in Box 2. One baby born to a mother with schizophrenia had a patent ductus arteriosus, which was treated conservatively. Babies born to women attending the CAMI clinic were less likely to have an Apgar score ≥ 8 at 1 minute (67% v 85%; P < 0.0001), and were also less likely to have an Apgar score ≥ 8 at 5 minutes (91% v 98%; P < 0.0001). Furthermore, special care nursery admissions were high (31.9%). Birthweights were about equivalent for the study infants and the general population (3366 g and 3341 g, respectively; P = 0.629). The mean POBW among the babies born to women attending the CAMI clinic was 0.986 (SD, 0.140), where 1 is considered optimal. There was no significant difference in POBW between diagnostic groups.

Psychosocial outcomes

Psychiatric relapses during pregnancy were common, with 22.5% of women being admitted to a psychiatric hospital during pregnancy. Psychiatric admission rates were higher for women with schizophrenia than for women with bipolar disorder and other diagnoses (38.6%, 10.7% and 21.1%, respectively; P = 0.004). Women with schizophrenia also had significantly higher rate of involvement of statutory child welfare services (Department for Child Protection) than women with bipolar disorder or non-psychotic SMI (50%, 14.3% and 23.7%, respectively; P = 0.0003).

Discussion

Our results confirm previous large-scale data linkage studies, indicating that pregnant women with SMI, particularly women with schizophrenia, remain at risk of obstetric complications. In contrast with the study by Jablensky and colleagues,3 conducted on the WA population between 1980 and 1992, our cohort represents a possible change in the profile of obstetric risks for pregnant women with SMI, with high mean maternal BMI at booking, increasing rates of GDM, pre-eclampsia, and neonatal adjustment difficulties within the context of relatively normal infant birthweights.

There are limited reports on associations between GDM and maternal exposure to antipsychotics during pregnancy.12,20 The rate of GDM in women attending our clinic (15.2%) was more than three times that for WA (4.4%). Our findings also highlighted an increased risk of pre-eclampsia compared with the overall population, which is in contrast with previous studies.2,3 These findings suggest a potential metabolic vulnerability in pregnant women with SMI, as pre-eclampsia and GDM share similar pathophysiological abnormalities and may relate to insulin resistance, a feature of metabolic syndrome, which is prevalent among patients with psychotic disorders.1 Increased rates of pre-eclampsia must be considered in the context of an increased proportion of nulliparity in the study sample, which increases the risk for pre-eclampsia, and the high rate of smoking, which is known to reduce it.21 The high mean maternal BMI at booking for our diagnostic groups may have influenced obstetric outcomes, as high maternal BMI is associated with gestational diabetes, pre-eclampsia and macrosomia.22

The primary strength of our study was that we examined in detail pregnant women with SMI in relation to their multifactorial risk profiles. In particular, we examined additional variables such as attendance at antenatal care, which is not routinely collected or available in data-linkage studies. The main limitation was a lack of a matched control group, which limited the assessment of this specialised care compared with routine care. In addition, post-hoc analyses found a number of our null findings were insufficiently powered, which may have masked the detection of some, necessarily small, differences in specific obstetric complication rates.

Women with schizophrenia gave birth to infants with mean birthweights not significantly different from those of the other diagnostic groups, and overall, the study sample had a similar mean birthweight to that of the WA population, even when smoking was accounted for. This contrasts with a number of studies that found that babies born to mothers with schizophrenia tended to have lower mean birthweight.2,3 A number of factors may account for these changes, including attendance to antenatal care, exposure to atypical antipsychotics, and increased maternal BMI. These factors may balance out the effects of the illness and smoking in terms of birthweight and preterm births.

In addition to an increased rate of suspected fetal distress, our findings showed that babies of women with SMI have poorer adjustment in the postpartum period, with relatively lower Apgar scores and higher rates of special care nursery admission. Compared with other findings,3 the women in our study did not have any documented narcotic reversal usage, which could suggest an increasing awareness of neonatal adjustment difficulties and the need for observation and conservative management.

Psychiatric relapses requiring inpatient admission were reported in over a fifth of women attending our clinic, and women with schizophrenia were more vulnerable. This may not only influence obstetric complications but adds to the complexities of antenatal management, in particular the need for close liaison between psychiatric and obstetric services. Similarly, the high rate of involvement of child welfare services in women with schizophrenia is in keeping with previous findings23 and reflects the disruptive nature of this condition on all facets of wellbeing and function. It further highlights the need for comprehensive multidisciplinary antenatal care with social work involvement and appropriate planning for the postpartum period.

1 Obstetric complications among women attending the Childbirth and Mental Illness Antenatal Clinic (CAMI clinic) and in the Western Australian population, 2008

Schizophrenia ( n = 44)

Bipolar disorder ( n = 56)

Non-psychotic SMI* ( n = 38)

P

CAMI clinic ( n = 138)

WA
( n = 29 805)

P

Complications of pregnancy

Threatened preterm labour

4 (9.1%)

4 (7.1%)

1 (2.6%)

0.483

9 (6.5%)

747 (2.5%)

0.006

Pre-eclampsia

3 (6.8%)

6 (10.7%)

3 (7.9%)

0.773

12 (8.7%)

792 (2.7%)

< 0.0001

Antepartum haemorrhage

4 (9.1%)

2 (3.6%)

2 (5.3%)

0.496

8 (5.8%)

1056 (3.5%)

0.232

Gestational diabetes

9 (20.5%)

7 (12.5%)

5 (13.2%)

0.501

21 (15.2%)

1322 (4.4%)

< 0.0001

No complications

16 (36.4%)

19 (33.9%)

14 (36.8%)

0.949

49 (35.5%)

20 450 (68.6%)

< 0.0001

Type of birth

Spontaneous vaginal delivery

14 (31.8%)

26 (46.4%)

18 (47.4%)

0.250

58 (42.0%)

15 781 (52.9%)

0.013

Instrumental

7 (15.9%)

16 (28.6%)

6 (15.8%)

0.198

29 (21.0%)

4098 (13.7%)

0.019

Elective caesarean

5 (11.4%)

7 (12.5%)

13 (34.2%)

0.010

25 (18.1%)

5347 (17.9%)

0.954

Emergency caesarean

18 (40.9%)

7 (12.5%)

1 (2.6%)

< 0.0001

26 (18.8%)

4453 (14.9%)

0.245

Complications of labour and delivery

Suspected fetal distress

18 (40.9%)

12 (21.4%)

9 (23.7%)

0.076

39 (28.3%)

3768 (12.6%)

< 0.0001

Postpartum haemorrhage

5 (11.4%)

10 (17.9%)

4 (10.5%)

0.512

19 (13.8%)

3500 (11.7%)

0.546

Shoulder dystocia

2 (4.5%)

3 (5.4%)

1 (2.6%)

0.814

6 (4.3%)

482 (1.6%)

0.028

Delay to progress < 3 cm

5 (11.4%)

1 (1.8%)

1 (2.6%)

0.069

7 (5.1%)

1206 (4.0%)

0.694

Delay to progress > 3 cm

14 (31.8%)

11 (19.6%)

5 (13.2%)

0.110

30 (21.7%)

1701 (5.7%)

< 0.0001

No complications

10 (22.7%)

27 (48.2%)

10 (26.3%)

0.014

47 (34.1%)

11 675 (39.2%)

0.254

SMI = severe mental illness. * Diagnoses: recurrent major depressive disorder (15); emotionally unstable personality disorder (12); generalised anxiety disorder (4); post-traumatic stress disorder (3); severe adjustment disorder (2); anorexia nervosa (1); panic disorder (1).

2 Neonatal outcomes for babies of women attending the Childbirth and Mental Illness Antenatal Clinic (CAMI clinic), compared with the Western Australian population, 2008

Schizophrenia ( n = 44)

Bipolar
disorder
( n = 56)

Non-
psychotic SMI* ( n = 38)

P

CAMI
clinic
( n = 138)

WA
( n = 30 234)

P

Apgar score

8–10 at 1 min

28 (63.6%)

36 (64.3%)

28 (73.7%)

0.558

92 (66.7%)

25 822 (84.9%)

< 0.0001

< 4 at 1 min

2 (4.5%)

2 (3.6%)

1 (2.6%)

0.898

5 (3.6%)

514 (1.7%)

0.154

8–10 at 5 min

40 (90.9%)

50 (89.3%)

35 (92.1%)

0.896

125 (90.6%)

29 683 (97.5%)

< 0.0001

Mean baby weight, grams (SD)

3356 (809)

3342 (639)

3415 (507)

0.865

3366 (663)

3341 (607)

0.629

Excluding smokers

3590 (484)

3539 (693)

3370 (478)

0.429

3506 (579)

Mean POBW (SD)

0.989 (0.169)

0.978 (0.123)

0.995 (0.131)

0.832

0.986 (0.140)

Mean gestation at birth, weeks (SD)

38.69 (2.78)

38.85 (2.48)

38.80 (1.53)

0.947

38.79 (2.35)

Preterm births (< 37 weeks)

5 (11.4%)

5 (8.9%)

2 (5.3%)

0.618

12 (8.7%)

2093 (7.0%)

0.548

Special Care Nursery admission

19 (43.2%)

14 (25.0%)

11 (28.9%)

0.138

44 (31.9%)

Department for Child Protection involvement

22 (50%)

8 (14.3%)

9 (23.7%)

0.0003

39 (28.3%)

POBW = proportion of optimal birth weight. SMI = severe mental illness. * Diagnoses: recurrent major depressive disorder (15); emotionally unstable personality disorder (12); generalised anxiety disorder (4); post-traumatic stress disorder (3); severe adjustment disorder (2); anorexia nervosa (1); panic disorder (1). Singleton data not separately reported. Total recorded Apgar scores in WA population at 1 min ( n = 30 427); total recorded Apgar scores at 5 min ( n = 30 431). Non-smokers: schizophrenia ( n = 22); bipolar disorder ( n = 31); non-psychotic SMI ( n = 21).


Provenance: Not commissioned; externally peer reviewed.

Received 2 September 2011, accepted 8 February 2012

  • Thinh N Nguyen1,4
  • Deb Faulkner2
  • Jacqueline S Frayne1
  • Suzanna Allen1
  • Yvonne L Hauck1,3,2
  • Daniel Rock2,4
  • Jonathan Rampono1,4

  • 1 King Edward Memorial Hospital, Perth, WA.
  • 2 Clinical Applications Unit, Centre for Clinical Research in Neuropsychiatry, Graylands Hospital, Perth, WA.
  • 3 Curtin University, Perth, WA.
  • 4 University of Western Australia, Perth, WA.

Correspondence: nguyent@meddent.uwa.edu.au

Acknowledgements: 

We acknowledge the work of the entire CAMI clinic team. We thank Jan Dickinson for her comments on the manuscript.

Competing interests:

No relevant disclosures.

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