Exercise 1: Pulmonary function tests
Respiratory parameter Units Experimental Value Predicted Value*
BPM 14
TV L 0.490L
IRV L 1.984L
ERV L 0.905L
RV L 1.45L
* Go to: http://www.dynamicmt.com/dataform3.html to calculate your predicted values.
1. What is the residual volume and why is it important to normal respiratory function?
- Residual volume is the volume of gas remaining in the lungs at the end of forced expiration
- It is important to normal respiratory function because it helps to keep the alveoli patent (open) and prevent lung collapse. It decreases the efficiency of gas exchange by diluting the oxygen of the inspired air. 2. Briefly describe Spirometry. - Spirometry is the most common of the pulmonary function tests, measuring lung function, specifically the volume and the flow of air that can be inhaled and exhaled. - Spirometry is the most useful for evaluating losses in respiration function and for following the course of certain respiratory disease.
3. Explain why the residual volume cannot be determined by Spirometry.
- Because pirometry can only measure how much air is moving out of or into the lungs, not how much is contained at a particular time.
4. You are a Nurse working a 19:00 to 07:00 shift. There are no attending physicians on your service and all the residents are sleeping. One of your patients is demonstrating signs of dyspnea. You call the respiratory service and an RT responds and conducts a PFT (Spirometry)