Kongerud J, Rambjør O
Department of Thoracic Medicine, Rikshospitalet, University of Oslo, Norway.
Am Ind Hyg Assoc J. 1991 Jun;52(6):243-8. doi: 10.1080/15298669191364668.
The efficiency of the Racal Airstream helmet respirator in improving peak expiratory flow rates (PEFR) and symptoms (dyspnea, wheezing, and cough) in aluminum potroom workers with respiratory complaints was assessed in 19 workers. Peak expiratory flow readings and symptom recording from a 2-week working period with use of the respirator were compared with a period when the 3M 9906 disposable mask was used. The study was designed as a randomized, parallel, cross-over study with five or six daily measurements of PEFR and daily symptom recording. A significant number of workers (15) had a higher mean peak flow in the helmet period than in the nonhelmet period (p less than 0.01); symptoms did not improve significantly in the helmet period. Objective evidence of respiratory protection was observed for the group of workers as a whole, but the effect on symptoms as well as individual effect on peak flow was minor in the majority of the workers.
对19名铝电解车间有呼吸道不适的工人，评估了Racal气流头盔式呼吸器在改善呼气峰值流速（PEFR）及症状（呼吸困难、喘息和咳嗽）方面的效果。将使用该呼吸器的2周工作期间的呼气峰值流速读数和症状记录，与使用3M 9906一次性口罩的时期进行比较。该研究设计为随机、平行、交叉研究，每天对PEFR进行5或6次测量，并每天记录症状。相当数量的工人（15名）在使用头盔期间的平均峰值流速高于未使用头盔期间（p<0.01）；在使用头盔期间症状没有显著改善。从整体来看，观察到该组工人有呼吸道防护的客观证据，但对大多数工人而言，对症状的影响以及对峰值流速的个体影响较小。
