Research: Stillbirth is often linked to the placenta

Stillbirth is often caused by pregnancy complications such as problems with the placenta or preterm labour.

Ten years ago, little was known about the causes of stillbirth, a term that describes when a baby dies at or after the 20th week of pregnancy.

1 in 160 pregnancies

While rare in the United States, stillbirth happens in one of 160 pregnancies, at a higher rate than other developed countries.

Pregnancy complications

Studies show that about half the time, one or more pregnancy complications appear to be the cause. Those include;

• Problems with the placenta which provide nutrients and blood to the foetus and removes waste.
• Infections
• Foetal abnormalities
• Problems with the umbilical cord

Looking at data from 500 pregnant women across five states, researchers were able to identify a probable cause of stillbirth in 61 percent of cases. About a third of those were linked to one or more of the above causes.

Research thwarted by lack of post-mortem analysis

Often, the research was thwarted by the lack of a post-mortem analysis, which about half of families do not authorize due to the trauma of the moment or financial concerns.

The study began with a potential set of over 900 women and ended with just 500, because it focused only on those who had ordered a complete post-mortem analysis.

“Our study showed that a probable cause of death (more than 60 percent) could be found by a thorough medical evaluation,” said Uma Reddy, one of the study authors.

“Greater availability of medical evaluation of stillborn infants, particularly autopsy, placental exam and karyotype (chromosomal analysis), would provide information to better understand the causes of stillbirth.”

Majority of stillbirths occur in developing countries

Ninety-eight per cent of the 7,000 stillbirths that occur each day happen in developing countries, according to research published in the Lancet.

Finland, with two stillbirths per 1,000 births, has the lowest rate in the world, whereas Nigeria and Pakistan, with more than 40 per 1 000, are the highest.

The US rate is 6.2 stillbirths per 1 000, or just over a half percent of all births, a rate that has remained stagnant since 2003 but which the study authors called “unacceptably high.”

Risk factors associated with stillbirth

The second study was led by George Saade of the University of Texas Medical Branch at Galveston, and examined risk factors that could be glimpsed at the start of pregnancy.

Some factors that were strongly associated with stillbirth included

• Black ethnicity
• Diabetes
• Maternal age of  40 or older
• AB blood type
• History of drug use with addiction
• Cigarette smoking within three months of pregnancy
• Being overweight or obese and not living with a partner

(AFP Relaxnews)

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