Evaluate the spirometry results of Patient D with a Predicted FVC of 2.29-2.97 and Predicted FEV1 of 2.68 with the Predicted FEV1/FVC of 88.6%; with a Resting FVC of 2.89 and Resting FEV1 of 2.48 with the Resting FEV1/FVC of 85.8%; with an Exercise FVC of 2.82 and Exercise FEV1 of 2.40 with the Exercise FEV1/FVC of 85.1%.
Added by Gregory M.
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** - The predicted FVC for Patient D is between 2.29 and 2.97. - The predicted FEV1 is 2.68. - The predicted FEV1/FVC ratio is 88.6%. Show more…
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A patient visits his physician and discusses feelings of inability to breathe. The physician suspects a chronic obstructive pulmonary disease (COPD) such as asthma and sends the patient to a clinical technician for forced expiratory volume (FEV) testing. The technician is inexperienced. They start by calibrating a digital spirometer. They use a cylinder that pumps a known volume of 0.75 liters through the airflow transducer of the spirometer. The transducer measures a volume of 0.63 liters, but the technician does not notice the difference and proceeds with the test. They then measure the forced expiratory volume in one second (FEV1) and the forced vital capacity (FVC) of the patient. They calculate the FEV1/FVC ratio. The physician receives the results and notes that the patient's FEV1/FVC ratio is 60%, suggesting moderate obstruction (Leader, 2021). Do you agree with this diagnosis? Why or why not?
Supreeta N.
Below is a graph summarizing the forced vital capacity for Patients A and B. Answer the following questions: 1. What is the FEV1 for Patient A? 2. What is the FEV1 for Patient B? 3. What is the FVC for Patient A? 4. What is the FVC for Patient B? 5. What is the FEV1/FVC ratio for Patient A? 6. What is the FEV1/FVC ratio for Patient B? Does either patient have lung disease? If yes, can you tell if it is obstructive or restrictive?
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A 37-year-old man is in the clinic today for worsening shortness of breath. He first noticed decreasing activity tolerance at age 28, at which time an x-ray revealed some hyperinflation consistent with mild emphysema. He had been smoking one pack of cigarettes per day since age 15 and quit at age 28. However, his shortness of breath has continued to progress. Physical examination reveals a thin man in moderate respiratory distress. There is a marked increase in the anteroposterior diameter, distant lung sounds, and occasional expiratory wheeze. Blood gases on room air are as follows: pH 7.42, PaCO2 40, PaO2 71, HCO3 – 26. PFT results are as follows: Predicted Normal Pre-bronchodilator Percentage of Predicted Post-bronchodilator Percentage of Predicted FEV1 3.8 L 16 18 FVC 4.8 L 29 35 FEV1/FVC >70% 44 40 TLC 7 L 130 130 In view of the pre- and post-bronchodilator data, does he have airways that are likely to respond to β2-agonist drug therapy?
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