A study of pulmonary function tests in street sweeper compared to general population
Satish Kumar Passyavula
A study conducted by Jafary ZA, Faridi IA and Qureshi HJ on 105 subjects using Vitalograph showed that Forced Vital Capacity(FVC), Forced expiratory volume in first second(FEV1) and Forced mid expiratory flow rate(FEF25-75%) all showed significant and highly significant decrements depending upon the extent of exposure to roadside dust. Mariammal T, Jaisheeba AA and Sornaraj R in their study on 249 subjects found out that in both construction and sanitary workers the mean of the actual values of FVC, FEV1, FEV1/FVC%, PEFR and FEF25-75% were significantly decreased to a greater extent when compared to control groups. All the parameters further significantly decreased to a greater extent when the years of experience of the workers increased above 15 years. A study by Okwari OO, Antai AB, Owu DU, Peters EJ and Osim EE showed that the mean values of FVC, FEV1, FEV/FVC% and PEFR of the workers exposed to timber dust were significantly lower(P<0.01) than in control subjects. Zodpey SP and Yogesh DS conducted a study on 273 street sweepers working in Nagpur Muncipal Corporation, Maharashtra and found that the proportion of chronic respiratory morbidities like Chronic bronchitis, Bronchial Asthma & Bronchiectasis were significantly higher among street sweepers than the comparison group.5 Ingle ST and WAGH N found variations in lung parameters (FVC, FEV1 and PEFR) among the vehicular pollution exposed and unexposed group. Significant decrease in FEV1 and PEFR was noted in the age group of 40- 49 years of exposed population. Raaschou-Neilson O, Neilson ML and Gehl J found a significantly higher prevalence of chronic bronchitis and asthma in street cleaners than in cemetery workers.