I am in process of being diagnosed: do I have asthma or some other breathing related problem. Currently going through the 2 week long PEF control, where one records the peak flow before and after the opening medication twice a day.
I have this weird problem. Almost always, but not always, when I blow into the device the first blow is clearly stronger than the blows to follow. E.g., the first blow can be 650-800+ liter per minute while the following ones land around 550. (Sometimes there is no difference.)
First I thought the device must be faulty and it can be, however my girlfriend does not have the same thing happening to her when we tested the device with her, in 4 different occasions.
Assuming the device is not faulty, any ideas why this is happening or what does is imply?