Is pulse rate and asthma connected?

Hi Weezer and thanks for the excellent question. While we cannot provide medical advice or diagnostics here (for your own safety), I believe your concern can be addressed without compromising our position.
In the most general of terms, one's heart rate can be affected by many parameters. One of them is hypoxia (low oxygen levels). The body's first response to hypoxia is to increase the heart rate. If one is hypoxic, and it is because of an asthma exacerbation, certainly the heart rate may be increased. On the other hand, if the medication, (aminophylline), relieves the asthma exacerbation, one's oxygen level may return to normal which could result in the heart rate coming down to within an acceptable range.
There are many other causes of an increased heart rate and, I'm sure you'll want to discuss this with your physician to determine what your particular situation is.
I hope this brief explanation has provided you with some additional insight for your concern. More importantly, I hope it will lead you to discuss this further with your physician and let us know how it all turns out.
Wishing you the best, Leon (site moderator)

Thank you Leon for the answer. I have been in a place of denial that my asthma was that serious (ignorance is bliss and this realisation is shocking me) I have booked in to see my physician shortly after the 2nd blood test is done for the therapeutic level checking, that blood test was done on the 23rd so the results are due soon. I had no idea that the tachycardia was being caused by the asthma and I am more surprised at my peakflow also rising with my heart rate now around 75 to 78. What a difference one increased made to me?

I need to really educate myself on severe asthma and it’s effect on the body as a whole and not just as a bad burden I need to deal with.