A new criterion is examined for evaluating the functional state of a patient and the states of his internal organs from pulse characteristics, which employs a chfferential coefficient DC represented by the ratio of the pulsewave signal variance to the variance of the first derivative. The physical meaning of DC is defined. It is shown that it can be used in interpreting organ state in terms of Tibetan medical terminology.The simplest and most informative way of examining the state of a patient and the states of his internal organs is from the spectral characteristics of the pulse waves as measured at the traditional palpation points in the radial artery. The test for the limiting normal and pathological is an energy coefficient EC, the ratio of the spectral density for the mean pulse wave power in the range from 1 to 10 Hz (E 1) to the corresponding quantity in the range from 10 to 50 Hz (E 2) [1]:(1)The ratio exceeds 100 [1] for healthy subjects, while it is less than 100 for patients suffering with prominent internalorgan pathology.However, that coefficient for the functional state shows on detailed examination low noise immunity and a nonlinear dependence on the pulse rate and on individual features (stature, weight, sex, and so on). We suggest a new test based on pulse characteristics called the differential coefficient DC.If one uses the DC derived from the pulse parameters to evaluate organ state, one can employ the ratio of the variance in the pulse wave signal as 2 to the variance of one of the derivatives o'i2 (first, second, and so on, i.e., i = 1, 2, 3 .... ), then we havein which tl n with n the number of measurements, xj and x k the current values of the pulse-wave signal and of the derivative of it, ~ the average values of the wave signal and derivative, and j, k = 1, 2 ..... n. We now define the physical meaning of this differential coefficient. If one represents the signal power as the sum of the low-frequency and high-frequency components and divides by the power in the high-frequency component, which is obtained by differentiation because of the attenuation in the low-frequency component, then one gets the ratio of the lowfrequency power to the high-frequency power plus one, i.e., the DC is analogous in physical meaning to the EC. The difference is that the separation of the components is made not as a rigid boundary of I0 Hz (as in the EC) but by means of higher-order derivatives or filters. This means that the DC will not change because of alteration in the heart rate as the spectrum is displaced along the frequency axis.
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