What Causes Irregular Heartbeat?
Possibly
Detailed Answer:
I follow your question.
An irregular heart rhythm always merits a detailed evaluation preferably by a qualified cardiologist.
But considering the reading is from an automated machine it would first make sense to have your pulse checked by a healthcare provider in-person first to confirm the presence of an irregular heartbeat problem.
Sometimes a low blood glucose reaction can cause a rapid heartbeat but it is seldom irregular. That being said, I see she is only on metformin for diabetes. Metformin is not known to cause a low sugar episode.
Thyroid problems can also result in an irregular heart beat.
When I see a patient in my practice who presents with complaints similar to those of your wife, I typically order the following tests in addition to a detailed physical examination:
CBC
Electrolytes
Calcium
HbA1c
Liver function tests
Kidney function tests
TSH
25 hydroxy Vitamin D