management of patient with increased intracranial pressure
TRANSCRIPT
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Management of patient with increased
Intracranial Pressure
Prepared bySALMAN HABEEB
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CONTENTS OF SKULL
• SKULL IS RIGID CLOSED STRUCTURE CONTAINS
1- the brain and interstitial fluid- 78%;
2- intravascular blood-12%
3- the CSF -10%
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INTRACRANIAL PESSURE
• ICP IS THE TOTAL PRESSURE EXERTED BY THE THREE COMPONENTS WITHIN THE SKULL
• IT IS THE HYDROSTATIC FORCE MEASURED IN THE BRAIN CSF COMPARTMENT
• MONRO-KELLIE HYPOTHSIS STATES THAT SKULL IS A RIGID STRUCTURE IF THE VOLUME OF THE ANY THREE COMPONENTS INCREAESES THE VOLUME FROM ANOTHER COMPONENT IS DISPLACED , THE TOTAL INTRACRANIAL VOLUME WILL NOT CHANGE
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Normal compensatory mechanisms
• ALTERATION CSF VOLUME- INCRESED ABSORPTION
DECREASED PRODUCTION DISPLACEMENT TO SUBARACHNOID SPACEALTERATION IN BLOOOD VOLUME- VASOCONSTRICTION VASODILATION TISSUE BRAIN VOLUME- DISTENTION OF DURAL SPACE
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• These compensatory mechanisms are to maintain a relatively constant amount of cerebral blood flow to meet the metabolic needs of the brain tissue
• Cerebral blood flow is the amount of blood in millimeters passing through 100g of brain tissue in 1minute
• Under normal conditions, the cerebral blood flow ranges between 50 and 60mL per 100g brain per minute
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• It makes approximately 700 to 850mL blood per minute for the whole brain and accounts for about 20% of the total cardiac output.
• The brain uses 20% of the body’s oxygen and 25% of the glucose
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Increased intracranial pressure
• Increased ICP is a life threatening situation that results from an increase in any or all of three components within the skull
(brain, CSF , blood )
• Brain edema is the common cause for elevated intracranial pressure
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Causes of brain edema
Space-Occupying Lesions
Intracerebral hemorrhageEpidural hemorrhageSubdural hemorrhageTumorAbscess
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CEREBRAL INFECTIONS• MENINGITIS• ENCEPHALITIS
BRAIN SURGERY
VASCULAR INSULT• Anoxic and ischemic episodes• Cerebral infarction (thrombotic and embolic)
TOXIC or METABOLIC ENCEPHALOPATHIES• Lead or arsenic poisoning• Hepatic encephalopathy• Uremic encephalopathy
HYDROCEPHALUS
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CEREBRAL EDEMA• VASOGENIC CEREBRAL EDEMA• CYTOTOXIC CEREBRAL EDEMA• INTERSTITIAL CEREBRAL EDEMA
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VASOGENIC CERBRAL EDEMA
• IT IS CAUSED BY CHANGES IN ENDOTHELIAL LINING OF CEREBRAL CAPILLARIES
• THESE CHANGES ALLLOW LEAKAGE OF MACROMOLECULES FROM THE CAPILLARIES INTO SURROUNDING EXTRAVASCULAR SPACE
• BRAIN TUMOURS, ABSCESSES AND INGESTED TOXINS COMMON CAUSES
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CYTOTOXIC CEREBRAL EDEMA
• IT RESULTS FROM LOCAL DISRUPTION OF THE FUNCTIONAL OR MORPHOLOGICAL INTEGRITYOF CELL MEMBRANE
• IT DEVELOPS FROM DESTRUCTIVE LESIONS OR TRAUMA TO BRAIN TISSUE RESULTING IN CEREBRAL HYPOXIA
• MOST OFTEN IN GREY MATTER OF BRAIN
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INTERSTITIAL CEREBRAL EDEMA
• It is the result of periventricular diffusion of ventricular CSF in a patient with uncontrolled hydrocephalus
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Mechanism of elevated ICP
CRANIAL INSULT
TISSUE EDEMA
ELEVATED ICP
COMPRESSION OF BLOOD VESSELS
DECREASED CEREBRAL BLOOD FLOW
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DECREASED O2 WITH DEATH OF BRAIN CELLS
FURTHER INCREASE IN EDEMA AROUND NECROTIC TISSUE
FURTHER ELEVATION IN ICP WITH COMPRESSION OF BRAIN STEM AND RESPIRATORY CENTER
ACCUMULATION OF CO2
VASODIALATION INCREASED ICP RESULTING FROM INCREASED BLOOD FLOW
DEATH
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CLINICAL MANIFESTATION
CHANGE IN LEVEL OF CONSCIOUSNESS
• SENSITIVE AND RELIABLE INDICATOR OF NEUROLOGIC STATUS
• IT RESULTS FROM IMPAIRED CERBRAL PERFUSION AFFFECTING CEREBRAL CORTEX AND RAS
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CHANGE IN VITAL SIGNS• INDICATE INCREASED PRESURE ON THE THALAMUS,
HYPOTHALAMUS, PONS AND MEDULLA
• MANIFESTED AS CUSHINGS TRIAD ELEVATED SYSTOLIC BP BRADYCARDIA WIDENING OF PULSE PRESSURE
• CHANGE IN BODY TEMPERATURE HYPOTHALAMUS AFFECTED
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OCCULAR SIGNS• COMPRESSION OF CRANIAL NERVE (111)-
PUPILLARY DILATION• FIXED UNILATERAL DILATED PUPIL – HERNIATION
OF THE BRAIN
• OPTIC- BLURRED VISION, DIPLOPIA• TROCHLEAR, ABDUCENS - EYE MOVEMENTS
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MIDLINE SHIFT OF BRAIN
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DECREASE IN MOTOR FUNCTION
• CONTROLATERAL HEMIPARESIS OR HEMIPLEGIA
• DECORTICATION- INTERRUPTION OF VOLUNTARY MOTOR CORTEX
• DECEREBRATION- DISRUPTION OF MOTOR FIBERS IN THE MIDBRAIN AND BRAIN STEM
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• IT is a state of severe hyperextension and spasticity in which an individual's head, neck and spinal column enter into a complete "bridging" or "arching" position
• Opisthotonus position
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HEADACHE• COMPRESSION OF OTHER
INTRACRANIAL STRUCTURES • CONTINOUS, WORSE IN THE
MORNING
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VOMITING• PROJECTILE TYPE• COMPRESSION TO CTZ( VOMITING
CENTER)
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DIAGNOSTIC STUDIES
• HISTORY COLLECTION AND PHYSICAL EXAMINATION
• COMPUTED TOMOGRAPHY
• MAGNETIC RESONANCE IMAGING
• ELECTROENCEPHALOGRAM
• POSITRON EMISSION TOMOGRAPHY
• MEASUREMENT OF ICP
• LP?
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Measurement of ICP• ICP should be monitored in patients admitted with
Glasgow coma scale (GCS) 8or less and an abnormal CT or MRI
• NORMAL ICP 5-15 mm hg/10 to 20cm H2O
• METHODS EPIDURAL SUBDURAL SUBARACHNOID INTRAPARENCHYMAL VENTRICULAR
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• GOLD STANDARD – VENTRICULOSTOMY
• A Specialized catheter is inserted into right lateral ventricle and coupled to an external transducer
This technique • directly measures pressure inside
ventricles, • facilitates removal or sampling of CSF • for intraventricular drug
administration
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• Direct visualization of the height of the CSF column generated outside the body or through its measurement by an external transducer
• CSF drainage using a closed system, elevations in ICP are controlled by removal of CSF by gravity drainage and by adjusting the height of drip chamber and drainage bag relative to ventricular reference point
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oTypically a point 15 cm above ear canal the drainage bag is placed
oRaising the height diminishes the drainage and vice versa
oNormal adult CSF production- 20-30ml/hr
oTotal CSF volume- 90-150ml
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COMPLICATIONS• Tentorial herniation mass lesion in the cerebrum forces the brain to herniate downward through the opening created by the brain stem• Uncal herniation lateral and downward herniation• Cingulate herniation It occurs when there is lateral displcement of brain tissue beneath the falx cerebrai
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MANAGEMENTGOALS• Identifying and treating the
underlying cause of increased ICP• Maintaining adequate perfusion and
oxygenation to the brain
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DRUG THERAPYAdminister INJ.mannitol 25%• It acts in TWO ways 1. Plasma expansion 2. Osmotic effect
• It have an immediate plasma expanding effect that reduces the hematocrit and blood viscosity there by increasing CBF and cerbral oxygenation
• It creates a vascular osmotic gradient , that will results to move the fluid from tissues to blood vessels
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• Corticosteriods( dexamethasone, dexona) It will help to improve the neuronal function Inhibit the synthesis of prostaglandins thereby preventing formation of inflammatory mediators
• Barbiturates ( Thiopental, pentobarbital ) It will decrease in cerebral metaabolism and subsequent decrease in ICP
• Antiepileptics( phenytoin) As seizure prophylaxis
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• H2 receptor antagonists or proton pump inhibitors Prevent gastric ulcers and bleeding
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Hyperventilation therapy
• In the past aggressive hyperventilation was one of the important treatment modality
• It will decrease the C02 level in the blood PaCO2 less than 25 mm Hg• Brief periods of less aggressive
hyperventilation therapy is useful PaCO2 30-35 mm Hg
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REDUCING CSF AND INTRACRANIAL BLOOD VOLUME
• CSF drainage is frequently performed because the removal of CSF with a ventriculostomy drain may dramatically reduce ICP and restore cerebral perfusion pressure.
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Nutritional therapy• All patients must have their nutritional
needs met regardless of their state of consciousness or health
• Adequate fluid volume should be maintained
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POSITIONING • Head position: Maintain head in
midline position at above 30 degrees to improve cerebral venous drainage; lower cerebral blood volume (CBV) will lower ICP.
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Surgical decompression
• Surgical decompression is indicated for clear-cut mass lesions amenable to removal, i.e. tumor, epidural bleed, large contusion. For refractory elevated ICP without a surgical lesion, there may be a role for a decompressive craniectomy. Especially if done early after the initial insult, it may improve functional outcomes of patients.
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NURSING MANAGEMENT
• ASSESSMENT NEUROLOGICAL ASSESSMENT GLASGOW COMA SCALE MIN SCORE- 3 MAX SCORE- 15 GCS below 8- indicative of coma
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NURSING DIAGNOSIS• Ineffective tissue perfusion (cerebral) related to
reduction of arterial blood flow and cerebral edema as evidenced by CPP<60 mm hg, GCS score <8, altered mental status, changes in mental status
INTERVENTIONs• maintain hemodynamic parameters within normal range• Calculate and monitor CPP• Monitor neurologic status• Maintain input and output chart• Administer medication • Administer oxygen
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• Decreased intracranial adaptive capacity related to decreased cerebral perfusion as evidenced by ICP More than 20 mm of hg, elevated systolic pressure, bradycardia and widened pulse pressure
Interventions• Monitor vital signs, ICP and neurologic status• Position the head end of the bed 30 degree or
more• Maintain normothermia• Give sedatives• Administer osmotic diuretics• Decrease stimuli in patients environment