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LETTER
Vagal overactivity: a risk factor of sudden infant death syndrome?
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Since early 1990, the incidence of sudden infant death syndrome (SIDS) has dropped sharply because of public health campaigns decrying the dangers of the prone sleep position. The other known risk factors, such as preterm birth and young maternal age, are less susceptible to prevention campaigns.1
Disordered autonomic function, including cardiorespiratory control, has been suggested to be involved in SIDS.2,3 Vagal overactivity (VO), characterised by breath holding spells and repeated syncopes in specific circumstances, has been described as …