Peak Expiratory Flow Rate Measurement

Question 1

How would you explain what the PEFR measurement is in patient-friendly language?

Answer 1

Today we need to measure how well air flows in and out of your lungs, which is known as peak flow rate. To do this, we use a peak flow meter, which is this device here. By measuring peak flow we can check how well your asthma is controlled.”

Question 2

What should you ask before completing the PEFR measurement?

Answer 2

Ask the patient if they have any pain or shortness of breath before performing PEFR measurement.

Question 3

What are the steps in volved in measuring the PEFR which you should clearly explain and demonstrate?

Answer 3

1. Ensure the peak flow meter is set to zero.
2. Position yourself sitting up straight or standing.
3. Take the deepest breath you are capable of.
4. Hold the peak flow meter parallel to the floor and position your mouth around the mouthpiece of the peak flow meter, creating a tight seal with your lips.
5. Exhale as forcefully as you are able to.
6. Note the reading on the peak flow meter, which is measured in litres per minute.
7. Repeat steps 1-6 twice more.

Question 4

Which reading should be used as the final result?

Answer 4

The highest

Question 5

What should you do when once you have demonstrated good inhaler technique?

Answer 5

After you have explained and demonstrated PEFR measurement, observe the patient carrying out the procedure and provide feedback to allow them to refine their technique.

Question 6

What factors are involved in calculating the expected peak expiratory flow rate?

Answer 6

patient’s age, sex and height

Question 7

What is an approximate normal reading?

Answer 7

A normal reading is approximately between 400 – 600 L/min.