I Am A 52 Year Old Female I Had An

I am a 52 year old female I had an EKG a few weeks ago as part of my yearly physical .
The EKG indicated I had Sinus Tachycarida Left Atrial Abnormality
I have an appointment with a cardiologists on April 26th .
I am a 6 year breast cancer survivor and I am woundering if this may have anything to do with the Chemotherapy drugs I received ?

Thank you
Cindy