Page 11 - The Mathematic Model - results from the spreadsheet for the initial model.
This is a snapshot from the spreadsheet showing the results when the input values are 5cm for the short axis, a range of wall thicknesses from 7mm to 11mm, and using standard values of 15% for mid-wall shortening and 15% for long axis shortening (expressed as their absolute ratios of 0.85). We will take a wall thickness of 9mm to be our "standard ventricle" for subsequent pages. The hydraulic effect has elevated wall thickening to 28%. Stroke volume and ejection fraction are reasonably normal.
Actually, the purpose of this initial model is to get an idea of how much the outer subepicardial rim shortens when the midwall is at 15%. You will see that it is 9.6% (ratio of 0.904) for a wall thickness of 9mm, but it does not take much more thickness of the wall for it to decrease further. The reason for wanting to know is that a simpler but more accurate model can be constructed if cell shortening is fed in as the value for the outer rim rather than the midwall, as you will see in the next page.