RESUMO
BACKGROUND: Cotton industry workers are exposed to various hazards in the different departments of textile factories. The major health problems associated with cotton dust are respiratory problems, byssinosis, bronchitis and asthma. OBJECTIVE: To study the effect of cotton dust exposure on pulmonary function and respiratory symptoms. SETTINGS AND DESIGN: This cross-sectional observational study was conducted at cotton mill in the Ahmedabad city. MATERIALS AND METHODS: One hundred cotton mill workers of the weaving and spinning area participated in this study while 100 age- and gender-matched male subjects living in the residential area served as the control group. A questionnaire was used to inquire about respiratory symptoms and spirometry was done in both the groups. STATISTICAL ANALYSIS USED: Student's t-test was used to find the difference between spirometric parameters, and Chi-square test was used to find the difference between respiratory symptoms. RESULTS: Respiratory symptoms were statistically significantly more common in the cotton mill workers compared to control group. Cotton mill workers group also showed significant (P < 0.0001) decrease in forced expiratory volume in 1 s (FEV1), ratio of FEV1 and forced vital capacity (FVC) and peak expiratory flow rate, and no significant difference of FVC between groups. There was an association of duration of exposure and symptoms with spirometric abnormality. CONCLUSION: Cotton mill workers showed a significant decrease in spirometric parameters and increase in respiratory symptoms. As the duration of exposure and symptoms increased, spirometric abnormality increased.
RESUMO
BACKGROUND: Lung reactions to exposure to dust, gases, and fumes at work places have been studied in different populations. The emission level of pollutants that emit particulate matter less than 10 micrometers in size (PM 10) has been found very high in Ahmedabad. Hence, petrol pump workers in Ahmedabad are likely to get exposed to a high level of air pollution along with petrol and diesel vapors. Both of these factors can affect the respiratory health of petrol pump workers. MATERIALS AND METHODS: A cross-sectional observational study was conducted at 53 different petrol pumps of Ahmedabad. A total of 227 petrol pump workers underwent pulmonary function testing. Their spirometry parameters were compared with 227 age-matched, healthy controls. RESULTS: A significant reduction (P < 0.001) was found in the spirometry parameters, such as, forced vital capacity (FVC), forced expiratory volume in the first second (FEV1), forced expiratory flow (FEF25-75), and peak expiratory flow rate (PEFR) in petrol pump workers, as compared to the controls. The mean values of FEV1/FVC (%) were significantly increased (P < 0.001). A decline in FVC was not significantly different among the workers according to the duration of exposure. As the duration of exposure increased, there was a progressive decline in FEV1/FVC (%) and FEF25-75. CONCLUSION: The study concludes that the deleterious effects of air pollution and petrol/diesel vapor inhalation on the lung function of petrol pump workers results in a restrictive type of lung function abnormality. The pattern of respiratory impairment changes to a mixed type as the duration of exposure increases.
