XIII. SUMMARY
The extra-cellulary recorded electrical signal from the heart during ventricular
fibrillation can be described as:
(1)
Elaboration of function T
(2)
Elaboration of function A(t)
(3)
Elaboration of function P
(1) Elaboration of function T
(2) Elaboration of
function A(t)
(3) Elaboration of
function P
Remark # 1
The functions T, A(t) and P have the suffix 'g', because every group 'g'
is supposed to have its own parameters.
Remark # 2
The form of the function E(t) is chosen to facilitate the mathematical insight.
All frequency domain analysis in this book is based upon Fourier transforms.
The Fourier transform of a train of Delta functions is again a train of Delta
functions and the Fourier transform of the exponential function is well defined
too. The Fourier transform of a convolution of functions is equal to the
product of the Fourier transforms of these functions. Now the mathematically
inclined reader can easily verify the strong resemblance between the calculated
spectra from function E(t) and the estimated spectra from electrocardiograms
during ventricular fibrillation, including the time domain phenomena like
pseudo waves!
Remark # 3
The functions E(t), T, A(t) and P can be visualized with the help of program
vf_simul. For download instructions see
models.
Return to the page of contents
.