| Autor: |
Dali J. Patel, P.R. DiGiovanni, S. E. Fu, Robert Echt, Shmuel Einav, J. L. Söderberg, K.-H. Krause, Jen-shih Lee, H. Chmiel, R.L. Fuhro, P. Schweizer, Nancy E. Warner, S. Fine, Kiyoji Kimura, Fred Plowman, H. Bulent Atabek, William P. Barreit, William F. YoungJr., Stephen H. Nellis, Joel E. Gray, H.J. Berman, Martin Trefler, W. Framing, T. Morrison, J.D. Fridman, Ramesh N. Vaishnav, Harold W. Puffer, Richard D. Dey, Ryu Nakayama |
| Rok vydání: |
1976 |
| Předmět: |
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| Zdroj: |
Microcirculation ISBN: 9781461343363 |
| DOI: |
10.1007/978-1-4613-4334-9_3 |
| Popis: |
A noninvasive method is presented for the measurement of the digital arterial compliance (C s and C d ) by use of a pneumatic cuff (Gaertner capsule) as a gasket when inflated and a fingertip pneumoplethysmograph. The compliance is obtained from the mean amplitude of the volume pulse waves \( \left( {\Delta {{\bar v}_i}{\rm{ and }}\Delta {{\bar v}_j}} \right) \) under the effect of the cuff pressures (P 0-i and P 0-j) by $$ \begin{array}{*{20}{c}} {{C_s} = {C_i} = 3\Delta {{\bar v}_i}/\left( {{P_s} - {P_{0 - i}}} \right)}\\ {{C_s} = {C_j} = \Delta {{\bar v}_j}/\left( {{P_s} - {P_{0 - j}}} \right)}\\ {{C_d} = {C_{i - j}} = 3\left( {\Delta {{\bar v}_j} - \Delta {{\bar v}_i}} \right)/\left( {{P_{0 - i}} - {P_{0 - j}}} \right)} \end{array} $$ during the dicrotic phase defined in this study. The value C s (= C d ) obtained from the data during the dicrotic phase is regarded as the compliance. As the cuff pressure is lowered to less than the systolic pressure, the coincident cuff pressure at the moment when the pulse wave begins to appear is regarded as the systolic pressure (P s ). The series of the pulse wave changes following the cuff pressure change is classified into five stages, i.e., A, B, C, D, and E. Stage D (dicrotic phase) is the successive stage after C and is characterized by the fact that the value C s is equal to the value C d and the pulse waves have the dicrotic notch. During the dicrotic phase, the venous pressure, the capillary pressure, and the diastolic pressure of arterioles in the segment distal to the compressed area approximate the cuff pressure (P 0). |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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