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Measuring lung function using sound waves: role of the forced oscillation technique and impulse oscillometry system.

Brashier B, Salvi S - Breathe (Sheff) (2015)

Bottom Line: Not only does it help in arriving at a specific diagnosis, but it also helps in evaluating severity so that appropriate pharmacotherapy can be instituted, it helps determine prognosis and it helps evaluate response to therapy.Spirometry is currently the most commonly performed lung function test in clinical practice and is considered to be the gold standard diagnostic test for asthma and COPD.Children aged <5 years, elderly people and those with physical and cognitive limitations cannot perform spirometry easily.

View Article: PubMed Central - PubMed

Affiliation: Chest Research Foundation, Marigold Complex, Kalyaninagar, Pune, India.

ABSTRACT
Measuring lung function is an important component in the decision making process for patients with obstructive airways disease (OAD). Not only does it help in arriving at a specific diagnosis, but it also helps in evaluating severity so that appropriate pharmacotherapy can be instituted, it helps determine prognosis and it helps evaluate response to therapy. Spirometry is currently the most commonly performed lung function test in clinical practice and is considered to be the gold standard diagnostic test for asthma and COPD. However, spirometry is not an easy test to perform because the forceful expiratory and inspiratory manoeuvres require good patient co-operation. Children aged <5 years, elderly people and those with physical and cognitive limitations cannot perform spirometry easily.

No MeSH data available.


Related in: MedlinePlus

Type of sound waves in FOT and IOS and distances travelled by sound waves of different frequencies.
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Figure 1: Type of sound waves in FOT and IOS and distances travelled by sound waves of different frequencies.

Mentions: The impulses generated by the loudspeaker travel superimposed upon the normal tidal breathing through the large and small airways. Higher frequencies (>20 Hz) travel shorter distances (generally up to the large airways), while lower frequencies (<15 Hz) travel deeper into the lung and reach the small airways and lung parenchyma (fig. 1). A useful analogy here is radio waves: radio waves of high frequency, such as FM radio travel shorter distances, while radio waves of lower frequency, such as AM radio travel long distances. A pressure–flow transducer measures inspiratory and expiratory flow and pressure, which are then separated from the breathing pattern by “signal filtering”. Measured Zrs is the sum of all the forces (Rrs and Xrs) opposing the pressure impulses (oscillations) and is calculated from the ratio of pressure and flow at each frequency [6]. The FOT/IOS is therefore an accurate and powerful method that measures Rrs and Xrs from input Zrs measurements made over a range of frequencies.Figure 1


Measuring lung function using sound waves: role of the forced oscillation technique and impulse oscillometry system.

Brashier B, Salvi S - Breathe (Sheff) (2015)

Type of sound waves in FOT and IOS and distances travelled by sound waves of different frequencies.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4487383&req=5

Figure 1: Type of sound waves in FOT and IOS and distances travelled by sound waves of different frequencies.
Mentions: The impulses generated by the loudspeaker travel superimposed upon the normal tidal breathing through the large and small airways. Higher frequencies (>20 Hz) travel shorter distances (generally up to the large airways), while lower frequencies (<15 Hz) travel deeper into the lung and reach the small airways and lung parenchyma (fig. 1). A useful analogy here is radio waves: radio waves of high frequency, such as FM radio travel shorter distances, while radio waves of lower frequency, such as AM radio travel long distances. A pressure–flow transducer measures inspiratory and expiratory flow and pressure, which are then separated from the breathing pattern by “signal filtering”. Measured Zrs is the sum of all the forces (Rrs and Xrs) opposing the pressure impulses (oscillations) and is calculated from the ratio of pressure and flow at each frequency [6]. The FOT/IOS is therefore an accurate and powerful method that measures Rrs and Xrs from input Zrs measurements made over a range of frequencies.Figure 1

Bottom Line: Not only does it help in arriving at a specific diagnosis, but it also helps in evaluating severity so that appropriate pharmacotherapy can be instituted, it helps determine prognosis and it helps evaluate response to therapy.Spirometry is currently the most commonly performed lung function test in clinical practice and is considered to be the gold standard diagnostic test for asthma and COPD.Children aged <5 years, elderly people and those with physical and cognitive limitations cannot perform spirometry easily.

View Article: PubMed Central - PubMed

Affiliation: Chest Research Foundation, Marigold Complex, Kalyaninagar, Pune, India.

ABSTRACT
Measuring lung function is an important component in the decision making process for patients with obstructive airways disease (OAD). Not only does it help in arriving at a specific diagnosis, but it also helps in evaluating severity so that appropriate pharmacotherapy can be instituted, it helps determine prognosis and it helps evaluate response to therapy. Spirometry is currently the most commonly performed lung function test in clinical practice and is considered to be the gold standard diagnostic test for asthma and COPD. However, spirometry is not an easy test to perform because the forceful expiratory and inspiratory manoeuvres require good patient co-operation. Children aged <5 years, elderly people and those with physical and cognitive limitations cannot perform spirometry easily.

No MeSH data available.


Related in: MedlinePlus