Intracranial volume-pressure relationship in man

Part 1: Calculation of the pressure-volume index

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✓ The pressure-volume index (PVI) was determined in 40 patients who underwent continuous monitoring of ventricular fluid pressure. The PVI value was calculated using different mathematical models. From the differences between these values, it is concluded that a monoexponential relationship with a constant term provides the best approximation of the PVI.

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Address reprint requests to: Joseph Th. J. Tans, M.D., Westeinde Hospital, Lijnbaan 32, 2512 VA The Hague, The Netherlands.

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Figures

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    Plot of constant term, c, versus 2 (PVI2-PVI4). PVI2 is obtained from a pure monoexponential volume-pressure model (Equation 3), assuming that the linear function of VFP and VPR passes through the origin. Extending the monoexponential model by a constant term, c (Equation 10), yields PVI4. The graph shows that PVI2 and PVI4 are about equal if c approaches zero. With increasing c values ranging from −10 to +10 mm Hg, the difference between PVI2 and PVI4 becomes greater.

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    Plot of PVI2 (Equation 3) versus PVI4 (Equation 10). Regression equation and line are shown. This diagram illustrates that there is a certain relationship between PVI2 and PVI4, but due to their variances one cannot be estimated from the other.

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