Systole volume prior to contractions at rest would have the highest numeric value (peak), and diastole prior to filling and after systole would be the lowest value. Subtract diastole from peak systole and devide by peak systole would provide the fraction of volume pumped with each heart beat.
A faster heartbeat does not provide enough time to fill as at rest, and the timing of contractions are less. The percent of blood pumped with each heartbeat is less reducing stroke volume (lower EF). The heart rate has increased to provide the necessary blood/oxygen to meet the system's demand for the diminished stroke volume.
The CT scan indicates there is substanital soft plaque buildup within the linings of the vessels. A couple of years ago, my total CT score was/is over 1000 and that is supposed to indicate a high probability for a heart event within a year....waiting for the other shoe to drop!...no problems, feel fine.
Hi - this is Sow 38 again!
Meant to say that I'm 50 and that there has been coronary disease on my father's side of the family a few generations ago