Brief Answer:
tests rule out heart disease
Detailed Answer:
HI, thanks for using healthcare magic
It is understandable that the digital monitoring reading is alarming but if you had a full cardiac work up (ECG, holter, echo,
stress test) and these were are all normal , then you do not have any heart disease.
Since these tests do not show evidence of structural or function problems with the heart , the readings may be as a result of (1)error on the part of the machine or , if you are experiencing palpitations, (2)non cardiac abnormalities-
anxiety, excess use of caffeine, some medications, electrolyte abnormalities,
hyperthyroidism can cause abnormal heart rhythms.
The test rule out any heart disease so any abnormal rhythm the machine is picking up would have to be due to one of these causes.
If it continues then you can consider rechecking your machine against your doctor's or simply going for a review
I hope this helps, feel free to ask any other questions