EFLt – PFTBlog
This can been seen when a patient exhales along the same flow-volume curve during quiet, tidal breathing as they do during a forced expiratory effort. Tidal expiratory flow limitation (EFLt) is a key concept in understanding dyspnea, hyperinflation and orthopnea in patients with COPD and in assessing the functional severity of COPD.
Richard Johnston | PFTBlog | Page 22
2017年10月17日 · The test was part of a pre-op workup for a patient with lung cancer who also had a diagnosis of COPD. I had looked at the spirometry results first (we always do spirometry pre- and post-exercise) and seeing that the patient had severe airway obstruction (FEV1 < 50% of predicted) assumed the review would be relatively straightforward.
Demographics Quiz | PFT Interpretation
Demographics Quiz. 1. If a subject’s height is mistakenly entered as being less than their actual height their predicted (reference) FEV1 will be underestimated. True. False. 2. If a subject’s developmental gender is entered as male when it should have been female, then the percent predicted FVC that is reported will be overestimated. True.
Observations, Opinions and Ideas about Pulmonary Function Testing
2016年2月28日 · As a solution, the authors point out that ratios, such as the FEV1/FVC ratio and the RV/TLC ratio tend to be relatively independent of height. Since: TLC = FVC + RV. This can be mathematically re-written as: Which means that TLC can be derived from predicted FVC if the RV/TLC ratio is known. Continue reading →
Observations, Opinions and Ideas about Pulmonary Function Testing
2014年11月8日 · Recently I was reviewing a cardio-pulmonary exercise test (CPET) that at first glance seemed to show the patient had a pulmonary mechanical limitation.
Interpretation – Page 3 – PFTBlog
2016年7月10日 · One of the more recognizable flow-volume loop contours is the one associated with severe airway obstruction. Specifically, this type of loop shows an abrupt decrease in flow rate following the peak flow with a more gradual decrease in flow rates during the …
Observations, Opinions and Ideas about Pulmonary Function Testing
2016年8月21日 · The reduced TLC showed a mild restrictive defect. At the same time the relatively normal DLCO indicates that the restriction is probably not due to interstitial lung disease and more likely either a chest wall or a neuromuscular disorder, both of which can prevent the thorax from expanding completely but where the lung tissue remains normal.
Ti - PFTBlog
E/I ratios above 2.0 aren’t all that uncommon in subjects with COPD. Occasionally a subject with normal baseline spirometry (i.e. a normal FEV1/FVC ratio) has an elevated and/or increasing E/I ratio throughout testing and this is a clue that they probably have some degree of airway obstruction that’s not otherwise evident, and possibly even ...
Comments on: Estimated Lung Age (ELA) - pftforum.com
Also, "lung age" is targeted at patients with COPD but it seems that the majority of articles on home spirometry that I've read lately don't think there's a lot of value in monitoring FEV1 in COPD and have instead found oximeters to be much more pertinent. - …
Comments on: Normal or obstruction? - pftforum.com
2. FVC response is seen frequently in COPD without changing FEV1. This is a volume response. Some very severe asthmatics also show this. I have a paper on this in Indian Journal of Chest Diseases. The ATS-ETS guidelines also recognize that the response to bronchodilator may be in FVC or FEV1. In this case, the FEF25-75 would have decreased. 3.