Hormone may predict postpartum depression: U.S. study

CHICAGO Tue Feb 3, 2009 6:48pm IST

1 of 2. A woman puts her hands to her ears while posing in an undated photo.

Credit: Reuters/File

Related Topics

CHICAGO (Reuters) - Spiking and sinking levels of a hormone that prepares a pregnant woman for the strain of childbirth may hold the key to why some women suffer postpartum depression, researchers said on Monday.

In a study of 100 women, researchers at the University of California, Irvine, found 12 out of 16 women who had postpartum depression also had high levels of a hormone circulating in the placenta midway through pregnancy.

Corticotropin-releasing hormone, or CRH, is normally produced in tiny amounts by the hypothalamus near the brain in response to stress.

In pregnant women, the placenta pumps out 100 times more CRH than is normally produced by the hypothalamus. The hormone has been nicknamed the "placental clock" because it is thought to prepare the woman's body for childbirth, said psychologist Ilona Yim, who worked on the study.

Levels of CRH and other hormones drop after the mother gives birth, which Yim said causes hormone "withdrawal" that can create havoc with the endocrine system.

"It puts the whole system out of whack," she said in a telephone interview.

CRH triggers a cascade of reactions in the pituitary and adrenal glands that culminates in increased output of stress hormones like cortisol.

Previous research suggested an overactive stress response plays a role in heart disease, Alzheimer's disease and autoimmune disorders. Stress hormones produced by a dysfunctional endocrine system may also trigger mental disorders like depression.

"When they look at the brains of suicide victims, they have elevated levels" of these stress hormones, Yim said.

Postpartum depression strikes those who experience the biggest change in the hormone levels, Yim found. Women who had high levels of CRH 25 weeks into their pregnancy were more likely to experience postpartum depression.

"This is the first study that implicates CRH in postpartum depression. That has implications for understanding this disorder," she said, adding the results needed to be replicated on a larger scale.

Postpartum depression affects as many as 1 in 5 women four to six weeks after childbirth, and 7 percent of new mothers suffer a major depression. If not addressed, women can become so despondent they attempt suicide, and some harm or neglect their newborns.

Previous bouts of depression, a lack of social support, low self-esteem and a stressful pregnancy all increase the likelihood of postpartum depression, according to the study, which appeared in the Archives of General Psychiatry.

The report suggested that a routine blood screening, which would coincide with a commonly performed prenatal diabetes test, could determine levels of the hormone at around 25 weeks to identify women at risk.

While antidepressant drugs can sometimes relieve postpartum depression, Yim urged a preventive approach, such as having at-risk women learn relaxation techniques common in prenatal yoga classes, and bolstering the emotional ties they may need.

(Editing by Maggie Fox)

FILED UNDER:

Health

REUTERS SHOWCASE

Lakhvi's Bail

Lakhvi's Bail

Pakistan court bails man accused of masterminding Mumbai attack.  Full Article 

Mass Stabbing

Mass Stabbing

Eight children killed in Australia in reported mass stabbing.  Full Article 

PM's Moves

PM's Moves

Modi moves in to speed up $300 billion stuck projects.  Full Article 

Coal Unions

Coal Unions

Coal India workers threaten five-day strike, stokes output worries.  Full Article 

Space Programme

Space Programme

ISRO tests its heaviest space launch vehicle, eyes global market.  Full Article 

Peshawar attack

Peshawar Attack

Some Pakistan militants denounce school attack, amid national outrage.  Full Article 

Uber Again

Uber Again

Uber driver in Boston charged with kidnapping and rape.  Full Article 

Discounts

Discounts

Dealers offer gold discount for first time in five months.  Full Article 

"PK" in Cinemas

"PK" in Cinemas

Secret of year's "biggest" Bollywood film is its plot.  Full Article 

Reuters India Mobile

Reuters India Mobile

Get the latest news on the go. Visit Reuters India on your mobile device   Full Coverage