The FVC/DLCO ratio. Will the real percent predicted please stand up?
Recently a reader asked me a question about the FVC/DLCO ratio. To be honest I’d never heard of this ratio before which got me intrigued so I spent some time…
Recently a reader asked me a question about the FVC/DLCO ratio. To be honest I’d never heard of this ratio…
9 Oct 2016 October 9, 2016 by Richard Johnston • Leave a comment
When no change is a change, or is it?
I was reviewing a spirometry report last week and when I went to compare the results with the patient’s last visit I noticed that the FVC and FEV1 hadn’t changed…
I was reviewing a spirometry report last week and when I went to compare the results with the patient’s last…
2 Oct 2016 October 2, 2016 by Richard Johnston • Leave a comment
Top 10 spirometry errors and mistakes
A couple of days ago my medical director and I had a short discussion about teaching pulmonary fellows to read PFTs and agreed that in order to be good at…
A couple of days ago my medical director and I had a short discussion about teaching pulmonary fellows to read…
25 Sep 2016 September 25, 2016 by Richard Johnston • Leave a comment
Which DLCO should be reported?
I like to think my lab is better than most but every so often something comes along that makes me realize I’m probably only fooling my self. Earlier this week…
I like to think my lab is better than most but every so often something comes along that makes me…
18 Sep 2016 September 18, 2016 by Richard Johnston • Leave a comment
When is a change in FVC significant?
Most of the COPD patients that are seen in my lab tend to have little change in their FEV1 from visit to visit but their FVC often changes significantly. A…
Most of the COPD patients that are seen in my lab tend to have little change in their FEV1 from…
11 Sep 2016 September 11, 2016 by Richard Johnston • Leave a comment
Six-Minute Walk with Helium-Oxygen
We recently performed a 6-minute walk test with helium-oxygen (heliox) for a patient of one of the physicians that specializes in airway stenting. His reasons for the test weren’t particularl…
We recently performed a 6-minute walk test with helium-oxygen (heliox) for a patient of one of the physicians that specializes…
7 Sep 2016 September 7, 2016 by Richard Johnston • Leave a comment
Ventilatory response to hypoxia and hyperoxia
While reading a recently published article I found they had performed response to hypoxia and hyperoxia testing as part of the study. At one time or another in the past…
While reading a recently published article I found they had performed response to hypoxia and hyperoxia testing as part of…
28 Aug 2016 August 28, 2016 by Richard Johnston • Leave a comment
When hypoventilation is the primary CPET limitation
Hypoventilation is defined as ventilation below that which is needed to maintain adequate gas exchange. It can be a feature in lung diseases as diverse as chronic bronchitis and pulmonary…
Hypoventilation is defined as ventilation below that which is needed to maintain adequate gas exchange. It can be a feature…
21 Aug 2016 August 21, 2016 by Richard Johnston • Leave a comment
Asleep at the wheel
During this last week I was contacted by two different individuals who were asking for help in understanding their PFT results. In both cases they had a markedly elevated TLC…
During this last week I was contacted by two different individuals who were asking for help in understanding their PFT…
10 Aug 2016 August 10, 2016 by Richard Johnston • Leave a comment
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