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A potential biological cause for sudden infant death syndrome

New autopsy data provide the strongest evidence yet that sudden infant death syndrome (SIDS) is not a "mystery" disease but has a concrete biological basis. In the November 1 issue of JAMA, researchers at Children's Hospital Boston document abnormalities in the brainstem ?a part of the brain that regulates breathing, blood pressure, body heat, and arousal ?in babies who died from SIDS.

SIDS is the leading cause of death in American infants after the newborn period, affecting 0.67 in 1,000 live-born babies. Although epidemiologic studies have identified risk factors for SIDS, such as putting babies to sleep on their stomachs, and protective factors like pacifier use, there has been little understanding of SIDS's biologic basis.

"Researchers led by neuropathologist Hannah Kinney, MD, and neuroscientist David Paterson, PhD, at Children's Hospital Boston and Harvard Medical School examined brain autopsy specimens from 31 infants who had died from SIDS and 10 who had died acutely from other causes, provided by the San Diego Chief Medical Examiner's office. Examining the lowest part of the brainstem, known as the medulla oblongata, they found abnormalities in nerve cells that make and use serotonin, one of over 100 chemicals in the brain that transmit messages from one nerve cell to another.

Based on their findings, Kinney, Paterson and colleagues hope to develop a diagnostic test to identify infants at risk for SIDS. They also envision a drug or other type of treatment to protect infants who have abnormalities in their brainstem serotonin system.

The brainstem serotonin system is thought to help coordinate breathing, blood pressure, sensitivity to carbon dioxide, and temperature during waking and sleep. When babies sleep face-down or have their faces covered by bedding, they are thought to re-breathe exhaled carbon dioxide, therefore breathing in less oxygen. Normally, the rise in carbon dioxide activates nerve cells in the brain
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Source:Children's Hospital Boston


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