Premenstrual disorders (PMDs) and perinatal depression (PND) appear to have a bidirectional association, a Swedish national registry-based analysis found.
In women with PND, 2.9% had PMDs before pregnancy vs 0.6% in a matched cohort of unaffected women, according to an international team led by Quian Yang, MD, PhD, of the Institute of Environmental Medicine at the Karolinska Institutet in Stockholm, Sweden. Their study appears in PLoS Medicine.
“Preconception and maternity care providers should be aware of the risk of developing perinatal depression among women with a history of PMDs,” Dr. Yang said in an interview. “Healthcare providers may inform women with perinatal depression about the potential risk of PMDs when menstruation returns after childbirth.” She recommended screening as part of routine perinatal care to identify and treat the condition at an early stage. Counseling and medication may help prevent adverse consequences.
In other findings, the correlation with PMDs held for both prenatal and postnatal depression, regardless of any history of psychiatric disorders and also in full-sister comparisons, the authors noted, with a stronger correlation in the absence of psychiatric disorders (P for interaction <.001).
“Interestingly, we noted a stronger association between PMDs and subsequent PND than the association in the other direction, Dr. Yang said. And although many experience PMD symptom onset in adolescence, symptom worsening has been reported with increasing age and parity. “It is possible that women with milder premenstrual symptoms experienced worse symptoms after pregnancy and are therefore first diagnosed with PMD after pregnancy,” the authors hypothesized.
Both PMDs and PND share depressive symptomatology and onset coinciding with hormonal fluctuations, particularly estrogen and progesterone, suggesting a shared etiology, Dr. Yang explained. “It’s plausible that an abnormal response to natural hormone fluctuations predisposes women to both PMDs and PND. However, the underlying mechanism is complex, and future research is needed to reveal the underlying etiology.”
Affecting a majority of women of reproductive age to some degree, PMDs in certain women can cause significant functional impairment and, when severe, have been linked to increased risks of accidents and suicidal behavior. The psychological symptoms of the more serious form, premenstrual dysphoric disorder, for example, are associated with a 50%-78% lifetime risk for psychiatric disorders, including major depressive, dysthymic, seasonal affective, and generalized anxiety disorders, as well as suicidality.
Mood disorders are common in pregnancy and the postpartum period.
The Swedish Study
In 1.8 million singleton pregnancies in Sweden during 2001-2018, the investigators identified 84,949 women with PND and 849,482 unaffected women and individually matched them 10:1 by age and calendar year. Incident PND and PMDs were identified through clinical diagnoses or prescribed medications, and adjustment was made for such demographics as country of birth, educational level, region of residency, and cohabitation status.
In an initial matched-cohort case-control study with a mean follow-up of 6.9 years, PMDs were associated with a nearly five times higher risk of subsequent PND (odds ratio, 4.76; 95% CI, 4.52-5.01; P <.001).
In another matched cohort with a mean follow-up of 7.0 years, there were 4227 newly diagnosed PMDs in women with PND (incidence rate [IR], 7.6/1000 person-years) and 21,326 among controls (IR, 3.8/1000). Compared with matched controls, women with PND were at almost twice the risk of subsequent PMDs (hazard ratio, 1.81; 95% CI, 1.74-1.88; P <.001).
Dr. Bernard Harlow
Commenting on the study but not involved in it, Bernard L. Harlow, PhD, a professor of epidemiology at Boston University School of Public Health in Massachusetts who specializes in epidemiologic studies of female reproductive disorders, said he was not surprised at these findings, which clearly support the need for PMD screening in mothers-to-be. “Anything that is easy to measure and noninvasive that will minimize the risk of postpartum depression should be part of the standard of care during the prenatal period.” As to safety: If treatment is indicated, he added, “studies have shown that the risk to the mother and child is much greater if the mother’s mood disorder is not controlled than any risk to the baby due to depression treatment.” But though PMDs may be predictive of PND, there are still barriers to actual PND care. A 2023 analysis reported that 65% of mothers-to-be who screened positive for metal health comorbidities were not referred for treatment.
Dr. Yang and colleagues acknowledged that their findings may not be generalizable to mild forms of these disorders since the data were based on clinical diagnoses and prescriptions.
The study was supported by the Chinese Scholarship Council, the Swedish Research Council for Health, Working Life and Welfare, the Karolinska Institutet, and the Icelandic Research Fund. The authors and Dr. Harlow had no relevant competing interests to disclose.