
Haller index around 5 + exercise intolerance/tachycardia — could this be affecting cardiac function?
I recently looked back at a chest CT I had done a while ago and noticed that the chest is very shallow front-to-back. I measured the Haller index at roughly 4.9–5.1 on a couple of axial slices.
I've also had an issue for quite a long time where my heart rate seems disproportionately high during relatively low-effort exercise. I've recently started endurance training, and I notice that even a small increase in pace can cause a significant increase in heart rate.
I previously had blood tests, an echocardiogram and a 24-hour Holter, which didn't show anything particular.
what do you guys think?