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Read PFTs
DD:Test 2
| Question | Answer |
|---|---|
| What are the limitations to PFT? | how it is interpreted. |
| What part of the PFT is a static measurement? | lung volume |
| What measures the mechanics of airflow; ability and speed of respiration? | Spirometry |
| What assess reversibility of disease? | bronchodilator response |
| What is a positive result that a disease is reversible? | FEV1 or FVC >12% and 200ml improvement after bronchodilator |
| What test helps determine obstruction? | Flow-Loop Volume |
| What test checks for interstitial lung disease? | DLCO-diffusion capacity |
| What test checks for asthma response if pt has normal PFT? | bronchoprovocation testing |
| List indications for PFT? | 1. evaluated s/sx 2. screening at risk population 3. monitor pulmonary drugs 4. abd studies (CXR, EKG, ABG, hgb) 5. Preoperative assessment |
| What percentage of smokers have abn PFTs? | 40% |
| What factors influence the PFTs normal results? | age, race gender |
| What races have lower lung volume? | Black, American Indian, oriental |
| What affects the quality of spirogram? | artifact (cough, variable effort, leak, early termination) good start (pt needs to be physically capable of completing test) reproducibility |
| What is the normal decline of FEV1? | 20-50ml/yr starting at age 35 |
| What is the decline of FEV1 in COPD pts? | 50-80ml/yrs |
| What type of lung disease decreases lung volume? | Restrictive |
| What is the amount of air left in our lungs minus vital capacity? | residual volume |
| What makes up vital capacity? | Inspiratory capacity and expiratory reserve volume |
| What comprises Inspiratory capacity? | tidal volume and inspiratory reserve volume |
| What is the tidal volume? | regular breath |
| What is the reproducibility criteria for PFTs? | the two largest FVC are within 200ml of each other and the 2 largest FEV1 are within 200ml of each other |
| What % predicted TLC indicates mild disease? | <85% but > 70% |
| What % predicted TLC indicates moderate and moderately severe disease? | moderate 70-60% severe <60% |
| What is FVC? | Forced Vital Capacity (Tidal volume, inspiratory and expiratory reserve volume) |
| What does the spirometery assess?` | 1. FEV1 2. FVC 3. FEV1/FVC 4. FEF 25-75 |
| What disease process causes decreased FEV1? | Obstructive |
| What is the normal % predictive FEV1? | >/= 100% |
| What are the ranges for the abd predictive FEV1? | mild: <100- >/= 70% moderate: <70 - >/= 60% mod. severe: <60 - >/= 50% severe: <50%- >/= 34% |
| What are differential diagnosis for obstructive lung diseases? | asthma; COPD: chronic bronchitis, emphysema; Bronchiectasis; Bronchiolitis Upper airway obstruction |
| What are differential diagnosis for restrictive lung diseases? | pleural parenchymal chest wall neuromuscular |
| What is a graphic display of the relationship between air flow and volume during a FVC (forced exhalation and inhalation)? | Flow-Volume Loop |
| What is the purpose of checking the flow volume loop? | Best reflection of the test acceptability |
| What kind of obstruction exist when the flow volume loop shows greater flow in exhalation than inspiration? | variable extrathoracic upper airway obstruction |
| What kid of problem causes the flow volume loop to have greater inspiration than exhalation? | variable intrathoracic upper airway obstruction |
| What are the criteria for PFT lung volume test according to Gladys, et al.(2003)? | FVC < 85%, FEV1/FVC ratio >55% that indicates restrictive disease |
Created by:
Tabble
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