Hi, my mom 75 yrs old, taken high BP & cholesterol medicine for 10 yrs, recently has dizziness average once a week [ duration 30 mins to 2 hours ], nausea on & off, MRI of brain no issue, ENT specialist commented no issue, then go for heart check, ECG done result ok. Question : Is this due to Vertigo ? What is the further step to confirm if any heart blockage ? thanks Ms Foo Malaysia