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Chest, Vol 101, 976-980, Copyright © 1992 by American College of Chest Physicians

ARTICLES

Relationship of urinary serotonin excretion to cigarette smoking and respiratory symptoms. The Normative Aging Study

D Sparrow, GT O'Connor, JB Young, B Rosner and ST Weiss
Department of Veterans Affairs Outpatient Clinic, Boston.

The relationship of 2-h urinary excretion of serotonin and 5- hydroxyindoleacetic acid (5-HIAA) to cigarette smoking and respiratory symptoms was examined among 631 male participants in the Normative Aging Study (age range, 44 to 85 years). The amount of serotonin excreted in urine was inversely related to age (p less than 0.001). Mean 2-h excretion of serotonin varied from 8.01 micrograms for men 40 to 49 years of age to 5.84 micrograms for those 70 years of age or over. No clear relationship was evident between the amount of 5-HIAA excreted in urine and age. After adjustment for age, current smokers were found to excrete more serotonin (p less than 0.001) and 5-HIAA (p = 0.001) than never smokers. Former smokers did not differ significantly from never smokers in these respects. After adjustment for age and smoking status in a multivariate model, chronic cough was a significant predictor of serotonin excretion (p = 0.005); chronic cough was less predictive of 5-HIAA excretion (p = 0.07). Other respiratory symptoms were unrelated to urinary excretion of serotonin and 5-HIAA. The mechanisms underlying the observed relationships of urinary serotonin and 5-HIAA excretion to smoking and to chronic cough and their potential relevance to chronic bronchitis remain to be determined.


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