Abstract
As from previous report we see that ballistocardiogram is impulse wave in which I and J wave are caused respectively by cardiac recoil and aortic impact and height of I and J wave hardly interfere one another, we can easily calculate the momentum of cardiac ejection from ballistocardiogram.Formula for calculatioh is as follows : momentum of cardiac ejection =K1(I+J)E or K2(I+J)√(C) where K1, K2 : constant of apparatus E : ejection time C : cardiac cycle When this formula is established, we can deduce from it the formula for calculation of stroke volume as follows : K1(I+J)E=Impulse =momentum (M×V) =Sv×Vm =Sv×Sv/A×E =Sv2/A×E so Sv=√(K1AE2(I+J)) or K3√(A(I+J)C) where Sv : stroke volume Vm : mean blood velocity in aorta
