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U.S. researchers said Monday they have developed a promising technology that may enable doctors to diagnose and possibly treat in utero a common cause of stillbirth and sudden death in infants.
The study, published in the American Heart Association journal Circulation, is the first to document the electrophysiological characteristics of fetal long QT syndrome and to evaluate the diagnostic accuracy of the magnetic EKG, or magnetocardiogram, in a sizable population of at-risk fetuses, the researchers said.
"Until now, physicians were unable to diagnose a serious heart condition known as long QT syndrome until after birth," Ronald Wakai, principal investigator of the study and a professor at the University of Wisconsin, said in a statement.
"Our study shows that you can diagnose the condition in utero and identify which fetuses are most likely to have life- threatening arrhythmia. We also showed that once detected the arrhythmia can be effectively treated in utero," Wakai said.
Long QT syndrome is present in about one in every 2,000 births and accounts for about 10 percent of sudden infant deaths and unexplained stillbirths, and it's also a leading cause of sudden death in children and young adults. Long QT predisposes the heart to develop a potentially lethal heart rhythm, but fetuses can be successfully treated if the rhythm is identified, Wakai said.
Using the magnetic EKG, the researchers diagnosed long QT in the womb with 89 percent accuracy, said the professor.
The researchers evaluated 30 pregnancies from 1996 to 2012 in Wisconsin and at two locations in Japan. They chose patients based on a family history of long QT syndrome, unexplained death of a sibling in infancy or childhood, or a suspicious fetal heart rhythm. They then collected data positioning a probe on the mother 's abdomen as early as midway through the pregnancy.
Long QT syndrome was diagnosed in 21 of the fetuses, the researchers said, adding that six of the fetuses had dangerous heart rhythms and one was delivered early after ominous rhythms were noted.
According to the researchers, magnetic EKGs will be put into practical use in the "not-too-distant future," but an accurate and complete family history remains the most critical aspect of diagnosing long QT syndrome.
