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Med Surg: Intracranial Pressure

Terms in this set (68)

What are the 3 components of the skull?
1.) brain tissue
2.) blood
3.) CSF
What factors influence ICP?
- arterial pressure
- venous pressure
- intraabdominal and intrathoracic pressure
- posture
- temperature
- blood gases (CO2 levels)
Monroe-Kellie Doctrine
- if one component increases, another must decrease to maintain ICP
- how the body tries to compensate for increased ICP
- only applicable when the skull is closed
Normal ICP
5-15 mmHg
Normal Compensatory Mechanisms
- changes in CSF volume
- changes in intracranial blood volume
- changes in tissue brain volume
(CPP) What is this?
cerebral perfusion pressure
(CPP) Formula
CPP = MAP - ICP
(CPP) Normal
60-100 mmHg
(CPP) < 50 mmHg
- ischemia
- neuronal death
(CPP) Low
blood not being perfused to the brain
(CPP) < 30
not compatible with life
(CPP) MAP Formula
MAP = SBP + 2(DBP) / 3
(Increased ICP) What does it cause?
decreased CPP
(Increased ICP) Causes
- mass/tumor/abscess/hematoma
- cerebral edema
- brain injury/inflammation
- bleeding
- infections, like meningitis
(Increased ICP) ABGs
acidosis
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