Relationship between oxygen saturation percentage and forced expiratory volume in one second in chronic obstructive pulmonary disease

 Considering the cost and some limitations in measuring the percentage of expiratory volume in the first seconds (FEV1%), This study was performed to determine the relationship between oxygen saturation percentage (SPO2%) with expiratory volume in the first-second (% FEV1) in patients with obstructive pulmonary disease(COPD).

In a descriptive-analytical study, 25 women and 25 men with COPD were selected by Non-probability and simple sampling from patients referred to the outpatient clinic of Vali-e-Asr Hospital regardless of the severity of the disease. To measure% FEV1 by spirometry method And a finger pulse oximeter was used to measure SPO2.Statistical tests including Pearson test and independent t-test and linear regression model were used.

The mean patient age 18/63 ±  47/10  years,  average% FEV1 of 15/16 ± 60/36 and the mean SPO2% 20/84 ± 53/5 was respectively. The correlation coefficient between% FEV1 and SPO2% was 0.36 (P=0.01). Mean of SPO2% in smokers and non-smoker was %82.67±5.22 and %86.50±5.29 respectively (p=0.02). Regression analysis in constant conditions showed %FEV1 By increasing one unit SPO2%, The amount of FEV1% probability by a factor of 16/0 will be increased 0.36(P=0.02).

  The amount of SPO2% significant correlation at the medium level with the amount of %FEV1 and can predict to some extent FEV1%;  Therefore, it has been diagnosed in people with obstructive pulmonary disease and It can be used for evaluation and follow-up of patients instead of spirometry.