Basically a lofty sounding description of one’s heart not being able to perform under load anymore for various reasons.
“Chronotropic incompetence (CI), broadly defined as the inability of the heart to increase its rate commensurate with increased activity or demand, is common in patients with cardiovascular disease, produces exercise intolerance which impairs quality-of-life, and is an independent predictor of major adverse cardiovascular events and overall mortality. However, the importance of CI is under-appreciated and CI is often overlooked in clinical practice. This may be due partly due to multiple definitions, the confounding effects of aging, medications, and the need for formal exercise testing for definitive diagnosis. ”
I am dealing with this and the surprising thing is the relatively abrupt onset, at least in my case, in a matter of weeks at most. Suddenly your heart rate drops into the bradycardia range,