Allergic diseases are among the most common diseases in childhood and their prevalence is 14%. One of the most important pathogenetic factors is the ability to produce IgE and the measurement of cord serum IgE seems to be very important for early detection of newborns at risk. Besides, cigarette smoke, among the environmental factors, has been demonstrated to influence the immunologic system, inducing an increase in IgE production. The aim of this study is to evaluate fetal production of IgE in newborns with a family history of atopy and whose mother has been smoking during pregnancy. The measurement of cord serum IgE has been performed in 215 at term newborns (weight at birth > 2500 g, Apgar score at 5' > 7). A careful history has been obtained with particular regard at the presence of familiarity for allergies and a cigarette smoking during pregnancy. According to the history, children have been divided in 3 groups: Group 1: 126 newborns without familiar history of allergy and born from no smoking mothers (control group); Group 2: 46 newborns with familiar history for allergy and born from no smoking mothers; Group 3: 43 newborns without familiar history for allergy born from smoking mothers. The II and III groups of newborns present total IgE levels on cord serum significantly higher than the control group. Besides a positive correlation between the number of cigarettes smoked during pregnancy and the value of cord serum IgE has been detected. It is well known that both genetic and environmental factors play an important role in the pathogenesis of allergic diseases.(ABSTRACT TRUNCATED AT 250 WORDS)
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