Just had an ekg for surgery clearance and it says t waves are borderline low voltage. is that normal? what could that mean. i do have a loop recorder implanted and have to get an ultrasound done?

Borderline low voltage T waves is a very nonspecific EKG finding especially if the rest of the tracing was within normal limits with normal voltage of the QRS complexes. If these also had low voltage, various conditions such as infiltrating heart muscle pathology, emphysema, obesity, pericardial fluid accumulation can be causes. Your MD will decide if a repeat EKG or other testing is advisable