Spirometry principles - Grace

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Patient-Related Problems The most common patient-related problems when performing the FVC manoeuvre are: Submaximal effort Leaks between the lips and mouthpiece Incomplete inspiration or expiration (prior to or during the forced manoeuvre) Hesitation at the start of the expiration Cough (particularly within the first second of expiration) Glottic closure Obstruction of the mouthpiece by the tongue Vocalisation during the forced manoeuvre Poor posture.
Instrument-Related Problems These depend largely on the type of spirometer being used. On volume-displacement spirometers look for leaks in the hose connections; on flow-sensing spirometers look for rips and tears in the flowhead connector tube; on electronic spirometers be particularly careful about calibration, accuracy and linearity. Standards recommend checking the calibration at least daily and a simple self-test of the spirometer is an additional, useful daily check that the instrument is functioning correctly.
Page 1 and 2: Spirometry Antoni Torres MD Grace M
Page 3 and 4: • To obtain a satisfactory spirog
Page 5: How to perform it? • FEV1 : • A
Page 12 and 13: Basic Measurements • Forced vital
Page 14 and 15: Prediction equations and limits of
Page 17 and 18: Different patterns: Restrictive •
Page 21: Bronchodilator response • Spirome

Spirometry principles - Grace

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