Consanguinity, marriage between relatives, has been associated with perinatal mortality and morbidity. Apnea of prematurity is defined as the cessation of breathing for longer than 20 seconds or that of any duration if accompanied by cyanosis and sinus bradycardia, for infants born before 37 weeks of gestation. The objective of the study was to examine the association between consanguinity and apnea of prematurity in Greater Beirut, an area having a relatively high prevalence rate of consanguineous marriages. The study was cross-sectional. Between September 1, 1998, and March 31, 2001, 21723 newborn infants were admitted to the National Collaborative Perinatal Neonatal Network in Greater Beirut, Lebanon. The inclusion criteria were infants less than 37 weeks of gestation who were admitted to the intensive care unit, with no congenital malformations, sepsis, or neurologic disorders. Analysis was based on 597 infants of whom 66 had apnea of prematurity. With adjustment for weeks and type of gestation, pregnancy complications, and Apgar score, the odds ratio of apnea of prematurity for first-degree consanguineous parents as compared with other marriages was 2.9 (95% confidence interval: 1.3, 6.4). In addition to the recognized etiologic factors for apnea of prematurity, this study suggests a role played by genetic factors.
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