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Primary Concepts (NUR 4110) Class 11 Increased Intracranial Pressure

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John Marsh
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Nova Southeastern University

Primary Concepts Of Adult Nursing II (NUR 4110)

Class 11 Increased Intracranial Pressure

Increased Intracranial Pressure
What is it?
 The rigid cranial vault contains brain tissue (1400 g), blood (75 mL), and CSF (75 mL).
 The volume and pressure of these three components are usually in a state of
equilibrium and produce the Intracranial Pressure.
 ICP is usually measured in the lateral ventricles.
 Normal pressure 0-10 mm Hg, and 15 mm Hg is the upper limit of normal
 The Monro-Kellie hypothesis states that, because of the limited space for
expansion within the skull, an increase in any one of the components causes a
change in volume of the others.
 Because brain tissue has limited space to expand, compensation typically is
accomplished by
1. Displacing or shifting CSF
2. Decreasing the absorption or diminishing the production of CSF
3. Decreasing cerebral blood volume. Without such changes, ICP begins to
rise.

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Primary Concepts (NUR 4110) Class 11 Increased Intracranial Pressure

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