Desaturation - distance ratio: a new concept for a functional assessment of interstitial lung diseases
INTRODUCTION: The functional evaluation has become increasingly important in the understanding and management of patients with interstitial lung diseases. The cardiopulmonary exercise test and the six-minute walk test (6MWT), through their isolated variables, have been used to do this evaluation, wi...
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doaj-4576284f6f97404ba8308e8fd3e89f082020-11-24T23:16:27ZengFaculdade de Medicina / USPClinics1807-59321980-53222010-01-0165984184610.1590/S1807-59322010000900005Desaturation - distance ratio: a new concept for a functional assessment of interstitial lung diseasesSuzana Pinheiro PimentaRenata Barbosa da RochaBruno Guedes BaldiAlexandre de Melo KawassakiRonaldo Adib KairallaCarlos Roberto Ribeiro CarvalhoINTRODUCTION: The functional evaluation has become increasingly important in the understanding and management of patients with interstitial lung diseases. The cardiopulmonary exercise test and the six-minute walk test (6MWT), through their isolated variables, have been used to do this evaluation, with some limitations. OBJECTIVES: We proposed a new composite index (desaturation distance ratio using continuous peripheral oxygen saturation (SpO2) and the distance walked as a more reliable tool for doing a functional evaluation of these patients. METHODS: 6MWT was performed by interstitial lung diseases patients and controls. Analyzed parameters were walked distance and desaturation area (DAO2), obtained by taking the difference between maximal SpO2 possible (100%) and patient's SpO2 every 2 seconds. desaturation distance ratio was calculated using the ratio between DAO2 and distance walked. RESULTS: Forty-nine interstitial lung diseases patients and 11 control subjects completed the protocol. The mean (SD) age was 60 (12) years and 65 (9) years, respectively (p:NS). Data obtained from 6MWT showed a significant statistical difference between interstitial lung diseases patients and controls: mean walked distance (430 and 602 meters, respectively); SpO2 minimal maintained at least 10 seconds - SpO2 min (85% and 94%, respectively), and median desaturation distance ratio (10 and 2.5, respectively). A correlation analysis, considering interstitial lung diseases patients, revealed the best correlation between desaturation distance ratio and DLco (r= - 0.72; p<0.001), being the correlation between SpO2 min and DLco of 0.61 (p<0.001) and among walked distance and DLco of 0.58 (p<0.05). CONCLUSION: Desaturation distance ratio is a promising concept and a more reliable physiologic tool to assess pulmonary diseases characterized by involvement of the alveolar-capillary membrane, such as interstitial lung diseases.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1807-59322010000900005The six-minute walk testPulmonary function testsInterstitial lung diseases |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Suzana Pinheiro Pimenta Renata Barbosa da Rocha Bruno Guedes Baldi Alexandre de Melo Kawassaki Ronaldo Adib Kairalla Carlos Roberto Ribeiro Carvalho |
spellingShingle |
Suzana Pinheiro Pimenta Renata Barbosa da Rocha Bruno Guedes Baldi Alexandre de Melo Kawassaki Ronaldo Adib Kairalla Carlos Roberto Ribeiro Carvalho Desaturation - distance ratio: a new concept for a functional assessment of interstitial lung diseases Clinics The six-minute walk test Pulmonary function tests Interstitial lung diseases |
author_facet |
Suzana Pinheiro Pimenta Renata Barbosa da Rocha Bruno Guedes Baldi Alexandre de Melo Kawassaki Ronaldo Adib Kairalla Carlos Roberto Ribeiro Carvalho |
author_sort |
Suzana Pinheiro Pimenta |
title |
Desaturation - distance ratio: a new concept for a functional assessment of interstitial lung diseases |
title_short |
Desaturation - distance ratio: a new concept for a functional assessment of interstitial lung diseases |
title_full |
Desaturation - distance ratio: a new concept for a functional assessment of interstitial lung diseases |
title_fullStr |
Desaturation - distance ratio: a new concept for a functional assessment of interstitial lung diseases |
title_full_unstemmed |
Desaturation - distance ratio: a new concept for a functional assessment of interstitial lung diseases |
title_sort |
desaturation - distance ratio: a new concept for a functional assessment of interstitial lung diseases |
publisher |
Faculdade de Medicina / USP |
series |
Clinics |
issn |
1807-5932 1980-5322 |
publishDate |
2010-01-01 |
description |
INTRODUCTION: The functional evaluation has become increasingly important in the understanding and management of patients with interstitial lung diseases. The cardiopulmonary exercise test and the six-minute walk test (6MWT), through their isolated variables, have been used to do this evaluation, with some limitations. OBJECTIVES: We proposed a new composite index (desaturation distance ratio using continuous peripheral oxygen saturation (SpO2) and the distance walked as a more reliable tool for doing a functional evaluation of these patients. METHODS: 6MWT was performed by interstitial lung diseases patients and controls. Analyzed parameters were walked distance and desaturation area (DAO2), obtained by taking the difference between maximal SpO2 possible (100%) and patient's SpO2 every 2 seconds. desaturation distance ratio was calculated using the ratio between DAO2 and distance walked. RESULTS: Forty-nine interstitial lung diseases patients and 11 control subjects completed the protocol. The mean (SD) age was 60 (12) years and 65 (9) years, respectively (p:NS). Data obtained from 6MWT showed a significant statistical difference between interstitial lung diseases patients and controls: mean walked distance (430 and 602 meters, respectively); SpO2 minimal maintained at least 10 seconds - SpO2 min (85% and 94%, respectively), and median desaturation distance ratio (10 and 2.5, respectively). A correlation analysis, considering interstitial lung diseases patients, revealed the best correlation between desaturation distance ratio and DLco (r= - 0.72; p<0.001), being the correlation between SpO2 min and DLco of 0.61 (p<0.001) and among walked distance and DLco of 0.58 (p<0.05). CONCLUSION: Desaturation distance ratio is a promising concept and a more reliable physiologic tool to assess pulmonary diseases characterized by involvement of the alveolar-capillary membrane, such as interstitial lung diseases. |
topic |
The six-minute walk test Pulmonary function tests Interstitial lung diseases |
url |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1807-59322010000900005 |
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