Background and purpose: Psychiatric disorders as a chronic illness lead to the exacerbation of physical symptoms and controlling them is very difficult. Respiratory chemical damaged veterans have many different psychiatric problems and low health-related quality of life. In this study, we evaluated the relations of spirometry parameters and health- related quality of life with mental health. Material and methods: This was a descriptive- co relational study done on 41 respiratory chemical veterans (Iran-Iraq war) selected with randomized available sampling in Tehran City. We used Spirometry test, St. George's Respiratory Questionnaire (SGRQ) & General Health Questionnaire (GHQ) for assessing the patients and Pearson's correlation matrix for analyzing the data. Results: There were significant negative correlations between the total score of GHQ and depression subscale with FVC & FEV1. There were significant positive correlations between the total score of GHQ and depression & anxiety subscales with total score of SGRQ. There were significant positive correlations between the total score of GHQ and depression & anxiety subscales with "symptoms" score of SGRQ. There were significant positive correlations between the total score of GHQ and depression & anxiety subscales with "impacts" score of SGRQ. Conclusion: Poor mental health condition with increased level of depression & anxiety leads to the decrease in FVC & FEV1 in spirometry and health-related quality of life, and increase in respiratory symptoms such as cough, breathless and sneezing. Totally, there were significant correlations between spirometry and health-related quality of life with mental health. It seems that in rehabilitation programs for mustard gas exposed veterans with chronic respiratory diseases, the psychological and psychiatric interventions should be considered.

Keywords: Spirometry, quality of life, mental health Questionnaire, Veterans, Chemical Warfare

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