Desaturation on 6-Min Walk Test: A Test with High Negative Predictive Value to Rule Out Pulmonary Hypertension in Interstitial Lung Diseases

Introduction: Pulmonary hypertension and other cardiac complications occur frequently due to chronic hypoxia induced by interstitial lung diseases (ILD) or due to connective tissue disorder itself. Two-dimensional (2D) echocardiography is ideal for identifying abnormalities at a given time. In this study, we tried to detect cardiovascular complications in patients with ILD using 2D echocardiography and correlate them with a 6-minute walk test (6 MWT) and spirometry. Materials and Methods: This study was carried out for 18 months including 100 consecutive cases of ILD. The diagnosis was made using the latest criteria as per the disease and high-resolution computed tomography (HRCT) thorax. All patients were evaluated with 2D echocardiography, 6 MWT, and spirometry along with routine investigations. Their results were analyzed using STATA 15.1 software. Result: Cardiovascular involvement was detected in 68% of cases. Pulmonary hypertension predominated with a prevalence of 50%. In spirometry, mean Forced expiratory volume in first second (FEV 1 )and Forced vital capacity (FVC) were found to be 54.96 (L) and 53.49 (L), respectively, with a predominant restrictive pattern (89%). There was a significant correlation between baseline saturation of oxygen (SpO 2 ) and pulmonary arterial systolic pressure (PASP) with a P value of <0.05. Baseline SpO 2 and distance covered in 6 MWT had a significant correlation ( P = 0.014). Conclusion: A baseline or nighttime hypoxia is responsible for developing PAH. Pulmonary arterial hypertension should be suspected in patients unable to perform 6 MWT or having low baseline SpO 2 . A routine follow-up with a 6 MWT and baseline SpO 2 should be performed in each visit to identify early deterioration of the disease.

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Desaturation on 6-Min Walk Test: A Test with High Negative Predictive Value to Rule Out Pulmonary Hypertension in Interstitial Lung Diseases

Cited by 2 publications

References 12 publications

Characteristics of patients with connective tissue disease-associated interstitial lung diseases

Characteristics of patients with connective tissue disease-associated interstitial lung diseases

Cardiovascular complications in patients with interstitial lung disease and their correlation with 6-minute walk test and spirometry

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