Assessment of impulse oscillometry findings in obstructive lung disease patients in Eastern part of Uttar Pradesh: An observational study
Keywords:
IOS (Impulse oscillometry),OAD (Obstructive lung disease), R(Resistance), R5 (Resistance at 5 Hz), R20 (Resistance at 20 Hz), R5-R20 (Heterogeneity of resistance), X (Reactance), Z (Impedance), AUC (Area under graph)Abstract
Background: Lung oscillometry is a simple, non-invasive lung function test where multiple frequency
pressure waves are forced into the respiratory tract superimposed over normal tidal breathing. It is predicted to
be a useful diagnostic tool with a bright future for diagnosing various respiratory disorders. Methodology: An
observational study was conducted in eastern part of Uttar Pradesh. All participants (80) who were diagnosed
as obstructive lung disease on the basis of clinical history, examination and PFT findings were selected and
oscillometry was performed. All parameters of oscillometry are then analysed. Result: Z score R5, the
sensitivity is 76%, specificity is 83.33%, PPV is 88.37%, NPV is 67.57%, and AUC is 0.240. Z score R5-20
exhibits a sensitivity of 80%, specificity of 63.33%, PPV of 78.43%, NPV of 5.52%, and AUC of 0.152. Z
score AX shows a sensitivity of 72%, specificity of 56.67%, PPV of 73.47%, NPV of 54.84%, and AUC of
0.241. Conclusion: Impulse oscillometry is a useful tool in the diagnosis and evaluation of adult patients with
obstructive airway disease. Z scores can be used to define OAD in oscillometry and can give more accurate
results.
