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?
Added by Marcus B.
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This could potentially affect the accuracy of the FEV1 and FVC measurements. Assuming that the FEV1 and FVC measurements were accurate, a FEV1/FVC ratio of 60% does suggest moderate obstruction. However, it is important to consider other factors such as the Show more…
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