A 52-year-old female has a 30-pack-year history of cigarette smoking and has shortness of breath.Room temperature is 26$\degree$ C (conversion factor = 1.068). What is the subject's reportable FEV₁ in BTPS conditions?

Question

Quizplus · Accepted Answer

The subject's FEV1/FVC ratio is not given, so we cannot use this to determine if there is airflow obstruction present. However, we can use the subject's age and smoking history to make an educated guess that there may be some degree of airflow obstruction. Because of this, we would want to calculate the subject's FEV1 in BTPS conditions to accurately assess their lung function. We first need to apply the temperature conversion factor:

26°C x 1.068 = 27.748°F

We can then use the following formula to convert the subject's reported FEV1 value to BTPS:

BTPS FEV1 = (reported FEV1 x body temperature factor x ambient pressure factor) / water vapor pressure factor

The body temperature factor is 1.01, the ambient pressure factor is 1, and the water vapor pressure factor is 0.95.

BTPS FEV1 = (1.9 x 1.01 x 1) / 0.95 = 2.014 L

Therefore, the subject's reportable FEV1 in BTPS conditions is approximately 2.01 L, which is closest to choice C (2.14 L).

A 52-Year-Old Female Has a 30-Pack-Year History of Cigarette Smoking °\degree°

A 52-Year-Old Female Has a 30-Pack-Year History of Cigarette Smoking $\degree$