Intracranial Volume/Pressure Relationships during Continuous Monitoring of Ventricular Fluid Pressure

1972 ◽  
pp. 270-274 ◽  
Author(s):  
J. D. Miller ◽  
J. Garibi
Keyword(s):  
Continuous Monitoring ◽  
Fluid Pressure ◽  
Intracranial Volume ◽  
Ventricular Fluid Pressure

Intracranial volume-pressure relationship in man

1982 ◽  
Vol 56 (4) ◽  
pp. 524-528 ◽  
Author(s):  
Joseph Th. J. Tans ◽  
Dick C. J. Poortvliet
Keyword(s):  
Best Approximation ◽  
Continuous Monitoring ◽  
Fluid Pressure ◽  
Constant Term ◽  
Volume Index ◽  
Intracranial Volume ◽  
Content Type ◽  
The Best Approximation ◽  
Ventricular Fluid Pressure ◽  
Fine Print

✓ 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.

Intracranial volume-pressure relationship in man

1983 ◽  
Vol 59 (5) ◽  
pp. 810-816 ◽  
Author(s):  
Joseph Th. J. Tans ◽  
Dick C. J. Poortvliet
Keyword(s):  
Continuous Monitoring ◽  
Fluid Pressure ◽  
Pressure Rise ◽  
Intracranial Volume ◽  
Content Type ◽  
Intensive Monitoring ◽  
Therapeutic Consequences ◽  
Ventricular Fluid Pressure ◽  
The Relationship ◽  
Fine Print

✓ Pressure-volume indices (PVI's) were determined for a heterogeneous group of 40 patients who underwent continuous monitoring of ventricular fluid pressure (VFP). The main purpose was to investigate the relationship between VFP and PVI and to establish the significance of the measured PVI values. Determinations of PVI appear to be useful only when baseline VFP is under 20 mm Hg, maximum VFP is under 30 mm Hg, A-waves are absent, and B-waves do not occur numerously. The authors advocate starting with 1-ml bolus infusions, and then, when the resulting pressure rise exceeds 4 mm Hg, additional bolus infusions can be omitted. Results indicate that 13 ml and 10 ml are the key values for the PVI. A PVI of less than 13 ml indicates the need for either reduction of VFP and improvement of compliance or intensive monitoring of both the VFP and the volume-pressure relationship; if the PVI is below 10 ml, anti-hypertensive treatment is almost always necessary. Values of PVI's between 13 and 18 ml, although pathological, usually have no therapeutic consequences.

Intracranial physiology and biomechanics

1982 ◽  
Vol 57 (4) ◽  
pp. 500-510 ◽  
Author(s):  
Eugeny I. Paltsev ◽  
Edward B. Sirovsky
Keyword(s):  
Brain Function ◽  
Quantitative Data ◽  
Fluid Pressure ◽  
Fluid Injection ◽  
Intracranial Volume ◽  
Clinical Tests ◽  
Content Type ◽  
Minimal Error ◽  
Active Compliance ◽  
Ventricular Fluid Pressure

✓ The intracranial pressure-volume (PV) relationship was examined postoperatively after removal of brain tumors in two groups of patients (13 in all). Changes of ventricular fluid pressure were analyzed by a method involving fluid injection into the lateral ventricle. A technique has been developed which provides quantitative data on the PV relationship with minimal error. The results confirm the exponential nature of the PV relationships. Various parameters characterizing the intracranial volume compliance, the cerebrospinal fluid pressure, and their interrelationship were investigated. It was found that 1) intracranial PV dependence is accurately defined by three parameters; 2) in patients who are not critically ill, ΔP/ΔV at P = Pmean does not vary statistically, and may be used as one of the important parameters to determine the regulation of the intracranial PV relationships. Examples are presented of the use of the data from the PV test for the control of the intracranial PV relationship. Examples are also given of the computation of volume redistribution in the cranium, both spontaneous and evoked by clinical tests. Analysis of the results allows the conclusion that the intracranial volume compliance concerned is an active compliance, which is controlled by the systems maintaining brain function.

A clinical comparison of subdural screw pressure measurements with ventricular pressure

1983 ◽  
Vol 58 (1) ◽  
pp. 45-50 ◽  
Author(s):  
A. David Mendelow ◽  
John O. Rowan ◽  
Lilian Murray ◽  
Audrey E. Kerr
Keyword(s):  
Head Injury ◽  
Intracranial Pressure ◽  
Severe Head Injury ◽  
Fluid Pressure ◽  
Ventricular Catheter ◽  
Pressure Measurements ◽  
Content Type ◽  
Single Lumen ◽  
Ventricular Fluid Pressure ◽  
Fine Print

✓ Simultaneous recordings of intracranial pressure (ICP) from a single-lumen subdural screw and a ventricular catheter were compared in 10 patients with severe head injury. Forty-one percent of the readings corresponded within the same 10 mm Hg ranges, while 13% of the screw pressure measurements were higher and 46% were lower than the associated ventricular catheter measurements. In 10 other patients, also with severe head injury, pressure measurements obtained with the Leeds-type screw were similarly compared with ventricular fluid pressure. Fifty-eight percent of the dual pressure readings corresponded, while 15% of the screw measurements were higher and 27% were lower than the ventricular fluid pressure, within 10-mm Hg ranges. It is concluded that subdural screws may give unreliable results, particularly by underestimating the occurrence of high ICP.

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