ewrobbins.com

User Tools

Site Tools

You are here: start » resources » pulm » interpreting_pfts
resources:pulm:interpreting_pfts

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revisionPrevious revision
Next revision		Previous revision
resources:pulm:interpreting_pfts [2023/12/20 14:32] – adminresources:pulm:interpreting_pfts [2024/03/08 18:32] (current) – [Assessing Restriction] admin
Line 6: Line 6:
  
 ====== Interpretation Position ====== ====== Interpretation Position ======
-At UMMC, PFTs do report LLN but not percentiles or z scores. +==== Why I use GOLD Criteria ==== 
-Thus, using ERS/ATS for diagnosing and grading abnormalities is not possible.+ 
 +At UMMC, PFTs do report LLN and reference value (pop mean?) but not percentiles or z scores. 
 + 
 +One can back-calculate the SD using $\sigma = \frac{LLN - ref}{-1.65}$ (this assumed LLN on our reports corresponds to 5th percentile). 
 + 
 +Once $\sigma$ is known for the each value (e.g., $\sigma_{FVC} \neq \sigma_{FEV1} \neq \sigma_{RV}$), you could then use $z = \frac{PT_{value} - ref}{\sigma}$ and refer to the tables below to grade severity. 
 + 
 +Given the complexity of this, using ERS/ATS for diagnosing and grading abnormalities is not possible.
  
 Therefore, I use GOLD criteria. Therefore, I use GOLD criteria.
Line 33: Line 40:
  
 === GOLD Criteria === === GOLD Criteria ===
-^ Grade ^ FEV1 Percent Predicted ^ Severity ^ +[[https://goldcopd.org/wp-content/uploads/2016/04/GOLD_Spirometry_2010.pdf | Source]] 
-|1| ≥80%|Mild| +^ Grade  ^ FEV1 Percent Predicted  ^ Severity     ^ 
-|2|50% − 79%|Moderate| +| 1      | ≥80%                    | Mild         | 
-|3|30% − 49%|Severe| +| 2      | 50% − 79%               | Moderate     | 
-|4|<30%|Very Severe|+| 3      | 30% − 49%               | Severe       | 
 +| 4      | <30% or <50% with CHRF  | Very Severe  |
  
 ==== Bronchodilator Response ==== ==== Bronchodilator Response ====
Line 53: Line 61:
     - $\Delta FEV1_{volume} >200 mL$     - $\Delta FEV1_{volume} >200 mL$
  
 +=== GOLD Definition ===
 +  - Required:
 +    - $BDR >12%$
 +    - $\Delta FEV1_{volume} \geq 200 mL$
 +
 +  - Calculation 
 +    - $ BDR = \frac{FEV1_{postBD} - FEV1_{preBD}}{FEV1_{preBD}}$
 +    - **NOTE: this differs from ERS/ATS calculation**
 +
 +==== Methacholine Challenge ====
 +[[https://doi.org/10.1183/13993003.01526-2016 | Source, ERS 2017]]
 +
 +===Response Categorization ===
 +{{:resources:pulm:methacholine_response.png?900|}}
 +
 +=== Testing Protocol ===
 +{{:resources:pulm:methacholine_challenge.png?600|}}
 ===== DLCO Severity===== ===== DLCO Severity=====
 === ERS / ATS Definition === === ERS / ATS Definition ===
Line 90: Line 115:
  
 === GOLD Definition === === GOLD Definition ===
-^ TLC Percent Predicted ^ Severity ^+  - Required: 
 +    - FVC <80% predicted 
 + 
 +^TLC Percent Predicted^Severity^
 |>70% | Mild | |>70% | Mild |
 |50%-69% | Moderate | |50%-69% | Moderate |
resources/pulm/interpreting_pfts.1703082755.txt.gz · Last modified: 2023/12/20 14:32 by admin

Page Tools

Except where otherwise noted, content on this wiki is licensed under the following license: CC Attribution-Share Alike 4.0 International
CC Attribution-Share Alike 4.0 International Donate Powered by PHP Valid HTML5 Valid CSS Driven by DokuWiki