Don’t ignore office spirometry
My PFT Lab has recently been asked by several doctor’s offices and clinics to advise them on the purchase of an office spirometry system. I am not a fan of…
My PFT Lab has recently been asked by several doctor’s offices and clinics to advise them on the purchase of…
31 Jul 2013 July 31, 2013 by Richard Johnston • Leave a comment
How to HAST
Patients that have problems with oxygenation at sea level are going to have even more problems at higher elevations where the barometric pressure and oxygen partial pressure are lower. During…
Patients that have problems with oxygenation at sea level are going to have even more problems at higher elevations where…
22 Jul 2013 July 22, 2013 by Richard Johnston • Leave a comment
Height and the GLFI FVC, FEV1 and FEV1/FVC ratio
Although the authors of the Global Lung Function Initiative (GLFI) study acknowledge the effect of height on their reference equations the range and distribution of heights in its study populations…
Although the authors of the Global Lung Function Initiative (GLFI) study acknowledge the effect of height on their reference equations…
25 Jun 2013 June 25, 2013 by Richard Johnston • Leave a comment
PETCO2 during exercise, a quick diagnostic indicator
I was reviewing a cardiopulmonary exercise test (CPET) recently. The test was part of a pre-op workup for a patient with lung cancer who also had a diagnosis of COPD.…
I was reviewing a cardiopulmonary exercise test (CPET) recently. The test was part of a pre-op workup for a patient…
20 Jun 2013 June 20, 2013 by Richard Johnston • Leave a comment
GLFI and the FVC, FEV1 and FEV1/FVC Ratio
The Global Lung Function Initiative (GLFI) was established by the European Respiratory Society in 2008 with the goal of establishing a truly worldwide set of reference equations for spirometry. Its…
The Global Lung Function Initiative (GLFI) was established by the European Respiratory Society in 2008 with the goal of establishing…
15 Jun 2013 June 15, 2013 by Richard Johnston • Leave a comment
The difficulties in reporting multiple spirometry post efforts.
It’s always fascinating how a simple problem can blossom into something much more complicated. Ninety-five percent of the time when we need to report post test results for spirometry they…
It’s always fascinating how a simple problem can blossom into something much more complicated. Ninety-five percent of the time when…
8 Jun 2013 June 8, 2013 by Richard Johnston • Leave a comment
The origin of FEV1 and the FEV1/FVC ratio
Over forty years ago when I started to learn about pulmonary function testing I was taught about the nuts and bolts of the tests, not where the tests came from…
Over forty years ago when I started to learn about pulmonary function testing I was taught about the nuts and…
3 Jun 2013 June 3, 2013 by Richard Johnston • Leave a comment
DLCO overestimated from an apparent zero offset error
I’ve had some concerns for a while now about how the CO and CH4 concentrations are being calculated from the DLCO analyzer calibration zero offsets and gains on our test…
I’ve had some concerns for a while now about how the CO and CH4 concentrations are being calculated from the…
23 May 2013 May 23, 2013 by Richard Johnston • Leave a comment
Tidal Expiratory Flow Limitation and NEP
Expiratory flow limitation exists when increasing expiratory effort fails to increase the expiratory flow rate. This can been seen when a patient exhales along the same flow-volume curve during qui…
Expiratory flow limitation exists when increasing expiratory effort fails to increase the expiratory flow rate. This can been seen when…
20 May 2013 May 20, 2013 by Richard Johnston • Leave a comment
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