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Thread: Fev

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    IMG SURVIVOR's Avatar
    IMG SURVIVOR is offline Moderator 536 points
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    Fev

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    FEV1 and FVC are both shown to be about 60% of the expected values, and the ratio
    of FEV1/FVC is 90%. These findings are most consistent with which of the following?
    / A. Asthma
    / B. Bronchiectasis
    / C. Chronic bronchitis
    / D. Emphysema
    / E. Restrictive lung disease
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    why even bother with the obvious. Just know where you are need it and where you can help the most.

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    The correct answer is E. Spirometry is commonly used to subdivide non-tumorous lung diseases into diseases that are predominately obstructive in nature and those that are predominately restrictive. The process of spirometry involves controlled breathing in and out while airflow is plotted against volume to obtain a continuous loop. FVC (forced vital capacity) is the maximum volume of air that can be forcibly and rapidly exhaled following a maximum inspiration. FEV1 (forced expiratory volume in the first second) is the volume of air expelled in the first second of a forced expiration starting from full inspiration. Restrictive lung disease usually shows a reduction in both FVC and FEV1, and the ratio of FEV1/FVC is greater than 80%. If these readings are obtained in a patient, further studies to measure lung volumes are usually performed to confirm the finding.
    Moderator: USMLE AND Residency Forums.

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    why even bother with the obvious. Just know where you are need it and where you can help the most.

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