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Supratentorial pressures. Part II: Intracerebral pulse waves.
J D Miller1, D F Peeler, J Pattisapu
1Department of Neurosurgery, University of Mississippi Medical Centre, Jackson 39216-4505.
Neurological Research
|September 1, 1987
Summary
Intracranial pulse wave analysis reveals distinct components related to arterial and venous pressures. Understanding these waves aids in diagnosing conditions like mass lesions affecting intracranial pressure (ICP).
Area of Science:
- Neurology
- Physiology
- Biomedical Engineering
Background:
- Intracranial pressure (ICP) monitoring is crucial for diagnosing neurological conditions.
- Cerebrospinal fluid (CSF) pulsations reflect intracranial dynamics.
- Characterizing intracerebral pulse waves can offer insights into ICP variations.
Purpose of the Study:
- To analyze intracerebral pulse wave components.
- To correlate pulse wave characteristics with different types of intracranial pressure changes.
- To evaluate the utility of pulse wave analysis in differentiating mass lesions from venous hypertension.
Main Methods:
- Recording intracerebral pulse waves in animal models (cats and monkeys).
- Performing controlled intracranial pressure manipulations, including mass lesion simulation and venous hypertension induction.
- Analyzing the morphology and components (P1-P4) of the recorded pulse waves.
Main Results:
- Intracerebral pulse waves closely resemble cerebrospinal fluid (CSF) pulsations.
- The P1 component is primarily arterial and is accentuated by ICP elevation due to mass lesions.
- Venous hypertension accentuates the P2 and P3 components more than P1.
- Bilateral carotid occlusion reduces the amplitude of the P1 wave.
Conclusions:
- Intracerebral pulse wave analysis can differentiate between ICP elevation caused by mass lesions and venous hypertension.
- The P1 wave component serves as an indicator of arterial pressure changes.
- The findings support a Starling resistor model for the cerebral venous system and its implications in ICP dynamics.