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[Otoneurologic and cardiovascular abnormalities associated to carbon monoxide poisoning in occupational exposed workers].

BACKGROUND
Even though Federal Labor Law includes carbon monoxide poisoning in the list of occupational diseases, the registration of this intoxication rarely occurs in a work environment. The objective was to determine the association of this poisoning with cardiovascular and otoneurologic disorders, in order to establish adequately this diagnosis as a work-related illness.


METHODS
Cross-sectional survey performed in a group of broiler production workers, compared with a control group (n = 54). The sample consisted of people aged between 18 and 74 years, males and females, smokers and non-smokers. We excluded those participants with clinical history of cardiac attack. We determined carboxyhemoglobin (COHb) rates in exhaled air, and performed an audiometric test, and a 12-lead electrocardiogram.


RESULTS
We studied 54 workers (57 % males and 43 % females). We obtained a statistically significant difference (p < 0.05) to develop hearing loss between the two groups, an odds ratio > 1 also in regards to hearing loss, and cardiovascular manifestations (anterior fascicle hemiblock).


CONCLUSIONS
Otoneurologic and cardiovascular abnormalities in occupationally exposed workers to carbon monoxide are not casual, and suggest a cause-effect relationship.