By Rachel Booker
This publication comprises crucial info while you're fascinated about respiration care. it really is an excellent reference for expert nurses, perform nurses, GPs, and all these healthcare execs who want a operating wisdom of lung functionality trying out.
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Other static lung volumes such as total lung capacity (TLC) or residual volume (RV) require more complicated techniques such as body plethysmography (box) or gas dilution tests (see p. 78) ■ Flow-measuring spirometers calculate lung volumes from airflow rates and therefore measure airflow directly. When volumetric spirometers are used flow rates are calculated from the lung volumes ■ The basic measurement of airflow measured during spirometry is: ◆ The ratio of FEV1 to FVC (FEV1/FVC or FEV1%). This is sometimes also referred to as the forced expiratory ratio (FER) V I TA L C A P A C I TY ■ VC is defined as: ‘The volume, measured at the mouth, between the positions of full inspiration and full expiration’ ■ It is the total amount of air that an individual can breathe in and out of their lungs in a single maximum breath 3 2 | V I T AL LU NG F UNC T I O N Vital Lung Function Final:Vital Lung Function 26/10/07 10:17 Page 33 ■ The term ‘vital capacity’ was coined by John Hutchinson, the inventor of the first spirometer ■ Hutchinson believed that this volume was essential for life – hence the term ‘vital’ capacity.
Robust data are only available for the 18–70-year-old age range. These data are extrapolated to cover adolescents and the over-70-year-old age group and are therefore less robust. This needs to be borne in mind when interpreting spirometry from these individuals ✱ A large number of reference values for different populations have been produced. The standard reference equations for use in Europe are those produced for the European Community for Coal and Steel (Quanjer et al 1993) REFERENCES Nunn AJ, Gregg I (1989) New regression equations for predicting peak expiratory flow in adults.
Check whether this is included in the purchase price Spirometers to avoid ■ Imported equipment with no technical support or servicing facility ■ Spirometers requiring expensive consumables, such as single patient use airflow tubes or expensive recording paper ■ Small, cheap, hand-held spirometers with no hard copy or real-time graphic facility V ITAL POINT ✱ The purchase of a spirometer involves capital outlay and ongoing costs. It is well worth spending time examining and testing a variety of equipment, to ensure it will meet your short- and long-term needs, before deciding which to purchase 3 0 | V I T AL LU NG F UNC T I O N Vital Lung Function Final:Vital Lung Function 26/10/07 10:17 Page 31 REFERENCES Association for Respiratory Technology & Physiology (2006) The ARTP spirometry handbook.