Advantages of late expiratory relaxation during maximal forced expiratory maneuver.

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dc.contributor.authorChhabra, S Ken_US
dc.contributor.authorVatsa, H Ken_US
dc.date.accessioned2001-10-10en_US
dc.date.accessioned2009-05-27T10:16:19Z
dc.date.available2001-10-10en_US
dc.date.available2009-05-27T10:16:19Z
dc.date.issued2001-10-10en_US
dc.description.abstractA modification of the maneuver for the maximal expiratory flow volume (MEFV) curve was described recently to improve the rate of achieving the acceptability criteria of the American Thoracic Society. The maneuver allows the subject to relax in the later part of expiration. The present study was carried out to determine if the modified spirometry technique offered any advantages over the standard FVC maneuver in asthma patients with a wide range of airways obstruction. MEFV curves were obtained in seventy-two subjects with standard and modified procedures in a randomized, crossover design. The patients were divided into four groups depending on the degree of airways obstruction-normal spirometry, mild, moderate and severe airways obstruction. The spirometric parameters (FVC, FEV1, FEV/FVC ratio, FET, PEFR and F25-75) were compared in each group. The modified technique gave a higher FVC measurement especially in patients with moderate and severe airways obstruction along with increased FET. PEFR and FEV1 were not different between the techniques. FEV1/FVC ratio was significantly decreased in patients with moderate and severe airways obstruction. Both the techniques gave equally acceptable and reproducible results with similar variability for FEV1 and FVC. It was concluded that the modification of the standard FVC maneuver by allowing the subject to relax in the later part of expiration is advantageous as it yields a lower FEV1/FVC ratio without affecting the FEV1, has the same within-session variability and is less strenuous.en_US
dc.description.affiliationDepartment of Cardiorespiratory Physiology, Vallabhbhai Patel Chest Institute, University of Delhi, Delhi, India. skchhabra@mailcity.comen_US
dc.identifier.citationChhabra SK, Vatsa HK. Advantages of late expiratory relaxation during maximal forced expiratory maneuver. The Indian Journal of Chest Diseases & Allied Sciences. 2001 Oct-Dec; 43(4): 205-10en_US
dc.identifier.urihttps://imsear.searo.who.int/handle/123456789/29553
dc.language.isoengen_US
dc.source.urihttps://medind.nic.in/iae/iaem.shtmlen_US
dc.subject.meshAdolescenten_US
dc.subject.meshAdulten_US
dc.subject.meshAirway Obstruction --diagnosisen_US
dc.subject.meshCross-Over Studiesen_US
dc.subject.meshFemaleen_US
dc.subject.meshForced Expiratory Volumeen_US
dc.subject.meshHumansen_US
dc.subject.meshMaleen_US
dc.subject.meshMaximal Expiratory Flow-Volume Curvesen_US
dc.subject.meshMiddle Ageden_US
dc.subject.meshSpirometry --methodsen_US
dc.subject.meshVital Capacityen_US
dc.titleAdvantages of late expiratory relaxation during maximal forced expiratory maneuver.en_US
dc.typeJournal Articleen_US
dc.typeRandomized Controlled Trialen_US
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