Our expert says:
Hulle werk dit met 'n wiskundige formule, die Simpson's rule, uit na aanleiding van jou hart se volumes voor en na 'n klop - nogal tegnies. Sy eggogram verslag sal sê of dit vergroot is of nie - vra jou huisdr om te kyk of as jy 'n afskrif het, skryf vir my neer dan kyk ek vir jou.
We begin by tracing the outline of the LV shadow at end-diastole (when it is the biggest) and end-systole (when it is the smallest). We then can use these outlines to calculate end-diastolic volume (EDV) and end-systolic volume (ESV). (In truth, we can't calculate the volumes - there is not enough information in one or two X-ray projections. We actually estimate the volumes using mathematical models and assumptions about the symmetries of the LV cavity.)These numbers are then plugged into a bunch of formulas to calculate other, more interesting, parameters, such as:
Stroke Volume (SV) = EDV - ESV
Ejection Fraction (EF) = SV / EDV
Cardiac Output (CO) = SV x Heart Rate
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