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J Clin Diagn Res. 2013 Aug;7(8):1606-8. doi: 10.7860/JCDR/2013/6182.3237. Epub 2013 Aug 1.

Pulmonary function tests in type 2 diabetics and non-diabetic people -a comparative study.

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  • 1Assistant Professor, Department of Physiology, Gsl Medical College , Rajahmundry-Andhra Pradesh, India .



The complications which are associated with type 2 Diabetes mellitus are mostly caused by macro vascular and micro vascular damages. The pulmonary complications of diabetes mellitus have been poorly characterised. The present study has focused on the mechanical aspects of lung dysfunction which are attributable to type 2 Diabetes Mellitus; maximal forced Spiro metric Pulmonary Function Tests (PFTs) like Forced vital capacity (FVC), Forced Expiratory Volume in 1sec (FEV1),. FEV1/FVC % and Peak expiratory flow rate (PEFR), to be specific.


1. To do a comparative analysis of the PFTs in type 2 diabetics and non-diabetics by using computerised spirometry. 2. To assess the effects of chronic hyperglycaemia on lung functions and functional limitations of activities of daily living which are ascribable to pulmonary complications, in patients with type 2 diabetes.


Spirometry was performed by using a computerised electronic spirometer, (RMS Helios 401, version 3-1-59, transducer number 4-16-1669) on 40 type 2 diabetics who were between 40-65 years of age and on 40 controls (who were matched for age, sex and BMI). Any person with a H/O smoking or any condition which affected the lung functions, was excluded from the study. The study was a cross sectional and a retrospective study. Data was analyzed and processed with the help of EPI INFO statistical software by using unpaired Student's 't'-test (two-tailed). The level of significance was taken as a p-value of <0.025.


This study clearly showed a statistically significant reduction in FVC, FEV1, PEFR in type 2 diabetics as compared to those in the controls. FEV1/FVC% was increased in type 2 diabetics as compared to that in controls and the increase was statistically significant.


This study concluded that type 2 diabetes adversely affects the mechanical functions of the lung, the pattern of disease being primarily restrictive in nature.


FEV1; FEV1/FVC %; FVC; PEFR; Spirometry; Type 2 diabetes

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