30F. Post exertion high HR, dizziness. Could it be CAD?
I am 30F, and obese (class III), I have been so for a long time. I had an episode of very fast HR at night while lying down, which was not measured with a device but I felt dizzy and sweaty. Got a cardiologist appointment and he ran ECG, resting echo, Holter test, bloodwork. The first three came back normal but labs showed total cholesterol 201. Low HDL, normal LDL but triglycerides at 270. It also showed I’m pre diabetic and my BP can be anywhere around 130/80. I was given a beta blocker and told to manage weight.
Since my last appointment, I've been following advice to increase physical activity. During brisk walking for twenty minutes or climbing a lot of stairs, my heart rate appears to rise to roughly 140 to 170 bpm by phone app estimate, after which I become kind of lightheaded and dizzy and need to stop. This has never happened before. My previous ECG, echocardiogram, and Holter were reported as normal, but these exertional symptoms continue and I'm worried about CAD. No family history so far except maternal grandma and uncle both of wholesome had blocked arteries, I’m South Asian, if that matters.