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Increased ICP
5th Semester - Mr. Keene
203
Nursing
Undergraduate 2
07/21/2013

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Cards

Term
What are the 3 components and percentages that occupy the skull?
Definition
brain tissue - 78%
cerebral blood flow - 12%
CSF - 10%
Term
What are the 6 factors that influence ICP under normal circumstances?
Definition
1. arterial pressure
2. venous pressure
3. intraabdominal pressure
4. posture
5. temperature
6. blood gases, esp. CO2
Term
What 5 areas of the brain allow for measure of ICP?
Definition
1. ventricles
2. subarachnoid space
3. subdural space
4. epidural space
5. brain tissue
Term
What is used to measure ICP?
Definition
a pressure transducer
Term
What is the normal ICP?
Definition
5-15 mm/Hg
Term
The body's initial compensation mechanisms for increased ICP are extensive. True or False?
Definition
False, these mechanisms are limited
Term
How is cerebral blood flow measured?
Definition
the amount of blood in mLs that passes through 100g of brain tissue in 1 min
Term
What is the normal global CBF?
Definition
50mL/min in 100g brain tissue
Term
What is the normal CBF of white matter?
Definition
25mL/min per 100g brain tissue
Term
What is the normal CBF of gray matter?
Definition
75mL/min per 100g brain tissue
Term
What percent of the body's oxygen and glucose does the brain use?
Definition
oxygen - 20%
glucose - 25%
Term
In what range must MAP be maintained for autoregulation of CBF to continue?
Definition
50-150 mm/Hg
Term
What is cerebral perfusion pressure (CPP)?
Definition
the pressure needed to ensure blood flow to the brain
Term
What is the equation for finding CPP?
Definition
CPP = MAP - ICP
Term
What is the equation for finding MAP?
Definition
MAP = 2(DBP) + SBP / 3
Term
Normal CPP is what?
Definition
60 - 100 mm/Hg
Term
Below what CPP does ischemia and neuronal death occur?
Definition
50 mm/Hg
Term
Below what CPP can life no longer be supported?
Definition
30 mm/Hg
Term
When does Cushing's triad occur?
Definition
with a loss of autoregulation when decompensation is occuring
Term
What are the parts of Cushing's triad?
Definition
increase in systolic BP with widening pulse pressure, bradycardia with a bounding pulse, altered respirations
Term
What happens to CBF and ICP with an increase in PaCO2?
Definition
increase in PaCO2 would increase CBF which would increase ICP
Term
What happens to CBF and ICP with a decrease in PaCO2?
Definition
decrease in PaCO2 would decrease CBF which would decrease ICF
Term
By what 3 mechanisms does an increase in PaCO2 lead to an increase in CBF?
Definition
1. relaxes smooth muscle
2. dilates cerebral vessels
3. decreases cerebrovascular resistance
Term
What fatal response will occur if pressure on the brain stem is unrelieved?
Definition
respiratory arrest d/t compression of the respiratory control center in the medulla
Term
What is cerebral edema?
Definition
increased accumulation of fluid in the extravascular space of the brain tissue
Term
What is edema caused by changes in the endothelial lining of cerebral capillaries that allow leakage of macromolecules from the capillaries into the surrounding extracellular space?
Definition
vasogenic cerebral edema
Term
What 3 factors influence the speed and extent of spread of cerebral edema?
Definition
1. systemic BP
2. site of brain injury
3. extent of blood-brain barrier defect
Term
In cases of cerebral edema a headache is a mild symptom with no immediate threat of harm. True or False?
Definition
False, in cases of cerebral edema a headache can quickly progress to coma or death
Term
This type of cerebral edema results from local disruption of the functional or morphologic integrity of cell membranes.
Definition
cytotoxic cerebral edema
Term
This type of cerebral edema results from a rupture of the CSF brain barrier and is usually a result of obstructive or uncontrolled hydrocephals.
Definition
interstitual cerebral edema
Term
What are the 2 treatments of hydrocephalus?
Definition
ventriculostomy and shunt
Term
Where does enlargement occur in cases of hydrocephalus?
Definition
cerebral ventricles
Term
What are the 3 probable causes of hydrocephalus?
Definition
1. excess CSF production
2. obstruction of flow
3. inability to reabsorb the CSF
Term
What is the most sensitive and reliable indicator of the patient's neuro status?
Definition
changes in LOC
Term
Changes in LOC are a result of impaired CBF which deprives the cells of what of oxygen?
Definition
cerebral cortex and reticular activating system (RAS)
Term
An intact ________ can maintain a state of wakefulness even in the absence of a functioning cerebral cortex.
Definition
reticular activating system (RAS)
Term
Is Cushing's triad considered a medical emergency? What is it a sign of?
Definition
yes; it is a sign of brainstem compression and impending death resulting from excessive increased ICP
Term
If the pupils are unilaterally dilated what does this indicate?
Definition
herniation of the brain
Term
What is the initial pupil response with cerebral herniation?
Definition
sluggish/equal response
Term
What type of hemiparesis will be noted in the pt with increased ICP contralateral or ipsilateral?
Definition
contralateral
Term
Which posture indicates brain stem damage and is considered the worst?
Definition
decerebrate, the wrist are flexed outwardly with pointed toes
Term
What is the distinguishing factor of vomiting r/t increased ICP?
Definition
it is not preceded by nausea
Term
What are the 2 major complications of uncontrolled increasing ICP?
Definition
inadequate cerebral perfusion and cerebral herniation
Term
Which 2 tests are used to differentiate the many conditions that cause increased ICP and evaluate therapeutic options?
Definition
CT and MRI
Term
Why is a lumbar puncture generally not performed on the pt with increased ICP?
Definition
the risk of cerebral herniation d/t the rapid release of pressure above the site of the LP
Term
At or below what Glascow Coma score should ICP monitoring be initiated if not already?
Definition
8
Term
What is the "gold standard" for ICP monitoring?
Definition
ventriculostomy
Term
What is a ventriculostomy?
Definition
a specialized catheter is inserted into the lateral ventricle and coupled to an external transducer
Term
What 3 functions does a ventriculostomy perform?
Definition
1. ICP monitoring
2. drainage of excess CSF
3. intraventricular drug administration
Term
What part of the ventriculostomy is leveled with what part of the body?
Definition
the transducer is leveled with the foramen of Monro
Term
What is a reference point for the foramen of Monro?
Definition
the tragus of the ear
Term
If a CSF drainage device is in place how long must it be closed prior to taking an ICP reading?
Definition
at least 6 mins
Term
What should the nurse do if an increase is noted in the mean ICP pressure or if an abnormal waveform is noted?
Definition
call the physician
Term
How does the nurse know when to begin intermittent CSF drainage?
Definition
physician will write the order at what ICP level to begin CSF drainage
Term
When ICP reaches the ordered level for CSF drainage, what is the procedure the nurse will follow with the ventriculostomy?
Definition
open the stopcock for 2-3 mins to allow drainage then close the stopcock
Term
Why is it recommended to have a sign posted in the room of a pt on a CSF drainage device?
Definition
if the pt is turned or anything is done that will increase ICP while the drain is draining it will remove too much CSF too quickly
Term
What 2 things does the LICOX system monitor?
Definition
continuous monitoring of pressure of oxygen in brain tissue and measures brain temperature
Term
What is the normal range for pressure of oxygen in brain tissue?
Definition
20-40 mm/Hg
Term
If the pt with increased ICP is intubated what should the goal be for both the PaO2 and PaCO2?
Definition
PaO2 - 100
PaCO2 - 30-35
Term
What is the best treatment, if possible, for increased ICP d/t a mass or tumor?
Definition
surgical removal
Term
What are 2 possible treatments to reduce cerebral tissue in cases of swelling or edema?
Definition
diuretics and corticosteroids
Term
What is Mannitol?
Definition
an osmotic diuretic
Term
How does Mannitol decrease ICP?
Definition
plasma expansion and osmotic effect which decreases the total brain fluid content
Term
What can be used with or instead of Mannitol in cases of increased ICP?
Definition
hypertonic saline
Term
Corticosteroids are used to treat vasogenic edema surrounding tumors and abscesses. When is the use of steroids contraindicated?
Definition
head-injured pts
Term
What are 3 complications of taking corticosteroids?
Definition
1. hyperglycemia
2. increased incidence of infections
3. GI bleed
Term
What should also be given if a pt is taking corticosteroids?
Definition
an H2 receptor blocker (Zantac), PPI (Protonix), or antacid to prevent ulcer or GI bleed
Term
What happens to ICP as metabolic demands increase (fever, shivering, agitation, seizures)?
Definition
ICP increases
Term
What classification of medicine is used to decrease cerebral metabolism, causing a decrease in ICP as well as a reduction in cerebral edema?
Definition
high doses of barbiturates (pentobarbital, thiopental)
Term
What is barbiturate dosing based on when used to treat increased ICP?
Definition
bedside EEG tracing and ICP
Term
Why does the pt with increased ICP require increased glucose?
Definition
because the increased ICP causes a hypermetabolic and hypercatabolic state
Term
How soon after injury should the pt with increased ICP be started on nutritional replacement? When should they be at full nutritional replacement?
Definition
-3 days
-7 days
Term
What are the most vital systems that need to be assessed initially in the pt with increased ICP?
Definition
respiration and circulation
Term
Which three factors are evaluated with the Glascow Coma Scale?
Definition
1. opening of eyes
2. best verbal response
3. best motor response
Term
What is the highest possible Glascow Coma Score?
Definition
15
Term
What is the lowest possible Glascow Coma Score?
Definition
3
Term
At or below what number generally indicates coma in the Glascow Coma Scale?
Definition
8
Term
If the oculomotor nerve (III) is compressed what happens to the ipsilateral pupil?
Definition
becomes larger until if fully dilates
Term
What pupil characteristic is indicative of early pressure on CN III?
Definition
a sluggish reaction
Term
What does a pupil that is unresponsive to light and stimulus usually indicate?
Definition
increased ICP
Term
How does the RN test eye movements of the unconscious pt?
Definition
doll's eye reflex
-turn the pt's head briskly right or left while holding the eyelids open, a normal response is movement of the eyes in the opposite direction of the head being turned
Term
How is pain response checked in the unconscious pt?
Definition
pressure applied to the finger nail bed
Term
What are 2 things that put the unconscious pt at risk of aspiration?
Definition
1. tongue falling to back of mouth
2. excessive secretions
Term
At what Glascow Coma Score is intubation generally indicated?
Definition
7 or below
Term
For the pt with increased ICP, what degree should the head of the bed be?
Definition
30
Term
What are the guidelines for suctioning the pt with increased ICP?
Definition
-only PRN and as little as possible
-less than 10 secs at a time
-administer 100% O2 before and after each pass
-limit to two passes per procedure
Term
What must CPP be kept above to preserve cerebral perfusion?
Definition
60 mm/Hg
Term
Which nursing intervention may interfere with the neurological assessment of the pt?
Definition
certain medications
Term
What advantages does morphine and fentanyl have for use with the pt with increased ICP?
Definition
minimal effect on CBF or oxygen metabolism
Term
What advantage does the sedative propofol have when used for agitation in the pt with increased ICP?
Definition
it has a rapid onset and short half-life so neuro checks can be done shortly after pausing the infusion
Term
Why are benzodiazepines usually avoided in pts with increased ICP?
Definition
because they have a long half-life and have a hypotensive effect
Term
What should be suspected if the pt with increased ICP shows signs of increased UOP and hypernatremia?
Definition
Diabetes insipidus
Term
What is the treatment for Diabetes insipidus?
Definition
fluid replacement and vasopressin or DDAVP
Term
What should be suspected if the pt with increased ICP shows signs of decreased UOP and hyponatremia?
Definition
SIADH
Term
What complications can follow SIADH?
Definition
cerebral edema, LOC changes, seizures, coma
Term
What effect does Valsalva maneuver, coughing, sneezing, hypoxemia, and waking from sleep have on ICP?
Definition
increases ICP
Term
The HOB should be elevated to 30 degrees for the pt with increased ICP, why should extreme neck flexion be avoided?
Definition
extreme neck flexion can cause venous obstruction which could elevate ICP
Term
What may occur if the HOB of a pt with increased ICP is raised above 30 degrees?
Definition
CPP may decrease d/t a lowered systolic BP
Term
At what 3 time points are pts with head trauma at risk for death?
Definition
1. at the time of injury
2. within 2 hrs after injury
3. approximately 3 weeks s/p injury
Term
What causes immediate death of pts with head injury?
Definition
direct trauma or massive hemmorrhage and shock
Term
What causes death of pts with head injury in the first 2 hrs?
Definition
progressive worsening of the injury or internal bleeding
Term
What causes death of pts with head injury at 3 wks s/p injury?
Definition
multisystem failure
Term
Why is the pt with a scalp laceration at a risk for profuse bleeding?
Definition
the scalp contains many blood vessels with poor constrictive ability
Term
What is rhinorrhea or otorrhea indicative of for the pt suffering a head injury?
Definition
that the fracture has transversed the dura
Term
Why should the pt with a CSF leak be started on antibiotics?
Definition
d/t the increased risk for meningitis
Term
What are the 2 ways to test leaking fluid to see if it is CSF?
Definition
1. test for glucose
2. test for halo sign
Term
What is the halo sign?
Definition
halo sign appears if CSF is placed on a white gauze and the blood will form an inner circle and a yellowish ring encircles the blood
Term
What type of skull fracture is a break in continuity of bone without alteration of relationship of parts?
Definition
linear
Term
What type of skull fracture is an inward indentation of the skull?
Definition
depressed
Term
What type of skull fracture is a linear or depressed fracture without fragmentation or communicating lacerations?
Definition
simple
Term
What type of skull fracture has multiple linear fractures with fragmentation of bone into many pieces?
Definition
comminuted
Term
What type of skull fracture is a depressed fracture with communicating pathway to intracranial cavity?
Definition
compound
Term
Raccoon eyes are indicative of?
Definition
orbital fracture
Term
Battle's sign is indicative of what 3 possible skull fractures?
Definition
1. temporal fracture
2. parietal fracture
3. basilar fracture
Term
What Glascow Coma Score range indicates minor brain injury?
Definition
13-15
Term
What Glascow Coma Score range indicates moderate brain injury?
Definition
9-12
Term
What Glascow Coma Score range indicates severe brain injury?
Definition
3-8
Term
What are the usual S&S of concussion?
Definition
brief disruption in LOC, amnesia regarding the event, and HA. Symptoms are usually brief
Term
When is postconcussion syndrome usually seen?
Definition
2 wks - 2 months s/p concussion
Term
What are the S&S of postconcussion syndrome?
Definition
-persistent HA
-lethargy
-personality/behavioral changes
-shortened attention span
-decreased short term memory
Term
What are the 4 types of focal brain injury?
Definition
1. lacerations
2. contusions
3. hematomas
4. cranial nerve injuries
Term
What is an actual tearing of the brain tissue?
Definition
laceration
Term
Can a brain laceration be surgically repaired?
Definition
no, d/t the nature of brain tissue
Term
How is a brain laceration treated?
Definition
prophylactic antibiotics until meningitis is ruled out; treatment of secondary increased ICP
Term
What are the S&S of a space occupying cerebral hemorrhage?
Definition
unconsciousness, hemiplegia on the contralateral side, dilated pupil on the ipsilateral side
Term
Bruising of the brain tissue within a focal area is?
Definition
a contusion
Term
What is the coup / contrecoup injury?
Definition
coup - injury to the brain that occurs at the site of impact
contrecoup - rebound injury that occurs on the opposite side of the brain from impact
Term
A hematoma that occurs between the dura and the inner surface of the skull is a?
Definition
epidural hematoma
Term
Is an epidural hematoma a neurologic emergency?
Definition
yes
Term
What is the difference in progression of a venous / arterial epidural hematoma?
Definition
-venous occur slowly under low pressure
-arterial occur rapidly under high pressure
Term
What are the classic signs of an epidural hematoma?
Definition
initial period of unconsciousness at the scene, followed by a brief lucid interval followed by a decrease in LOC
Term
What must be done quickly to prevent herniation in the pt with an epidural hematoma?
Definition
evacuation of the hematoma
Term
What type of hematoma occurs between the dura mater and the arachnoid layer?
Definition
subdural hematoma
Term
What is the normal rate of progression of a subdural hematoma?
Definition
subdural hematoma is usually venous in origin so it usually develops slowly
Term
What are the 3 types of subdural hematoma?
Definition
1. acute
2. subacute
3. chronic
Term
What is the time frame for an acute subdural hematoma?
Definition
24-48 hrs s/p severe trauma
Term
What is the time frame for a subacute subdural hematoma?
Definition
48 hrs - 2 wks s/p severe trauma
Term
What is the time frame for a chronic subdural hematoma?
Definition
weeks to months s/p injury; generally greater than 20 days and injury may have seems minor at the time
Term
How soon are symptoms seen with an acute subdural hematoma?
Definition
immediate deterioration
Term
What is the treatment for a subdural hematoma?
Definition
evacuation and decompression
Term
Why are older pts and alcoholics more prone to subdural hematoma?
Definition
old age and alcoholism causes brain atrophy which causes a larger subdural space
Term
Is a hematoma that occurs from bleeding within the brain tissue?
Definition
intracerebral hematoma
Term
What is the best diagnostic test to evaluate head trauma rapidly?
Definition
CT scan
Term
What treatment is necessary for depressed fractures and fractures with loose fragments?
Definition
craniotomy
Term
What technique is the removal of a section of the skull?
Definition
craniectomy
Term
What is the treatment for large hematomas?
Definition
surgical evacuation
Term
What is the technique for surgical evacuation?
Definition
craniotomy is performed to visualize the hematoma, Burr-hole openings may be used for rapid decompression, for extreme hematoma craniectomy may be necessary
Term
Doing what would reduce the greatest risk for head injury?
Definition
using seatbelts
Term
What is the general goal of nursing management of the head injured pt?
Definition
maintain cerebral oxygenation and perfusion
Term
What is the treatment of diplopia?
Definition
an eyepatch
(diplopia = double vision)
Term
Periorbital ecchymosis resolves on its on, what can hasten this progress?
Definition
cold then warm compresses
Term
What is the most vulnerable time for seizures to occur following a head injury?
Definition
within the first week
Term
Why is Dilantin typically used s/p head trauma?
Definition
prophylactic seizure measure
Term
Pts with head injury who have been unconscious for 6 hrs or more will typically display what when they awaken?
Definition
some personality change
Term
How long s/p head trauma can progressive recovery continue until a plateau is reached?
Definition
6 months
Term
What are some of the "no" policies that a physician may prescribe for the head trauma pt at discharge?
Definition
NO...
-drinking alcohol
-driving
-us of firearms
-work with hazardous implements/machinery
-unsupervised smoking
Term
What determines which S&S are apparent with a brain tumor?
Definition
size and location of the tumor
Term
A brain tumor that obstructs the ventricle or occludes the outlet can lead to what?
Definition
hydrocephalus
Term
When do tumor related HAs tend to be worse?
Definition
night
Term
Are lumbar punctures generally performed r/t brain tumors?
Definition
no; d/t risk of herniation
Term
What tissue does Glioblastoma multiforme originate from?
Definition
primitive stem cells
Term
What are the characteristics of Glioblastoma multiforme?
Definition
highly malignant and invasive; among the most devastating of primary brain tumors
Term
What is the tissue of origin Hemangioblastoma?
Definition
blood vessels of brain
Term
What are the characteristics of Hemangioblastoma?
Definition
rare and benign; surgery is curative
Term
What is the tissue of origin of metastatic tumors?
Definition
lungs, breast, kidney, thyroid, prostate, etc
Term
What are the characteristics of metastatic tumors?
Definition
malignant
Term
What location would the tumor be of a pt exhibiting unilateral hemiplegia, seizures, memory deficit, personality and judgement changes, and visual disturbances?
Definition
frontal lobe tumor
Term
What would the location be of a tumor if the pt exhibits speech disturbances, inability to write, spatial disorders, unilateral neglect?
Definition
parietal lobe tumor
Term
What location would the tumor be if the pt exhibited vision disturbances and seizures?
Definition
occipital lobe tumor
Term
What location would the tumor be if the pt exhibited few symptoms possible seizures and dysphagia?
Definition
temporal lobe tumor
Term
What location would the tumor be if the pt exhibited HA on awakening, drowsiness, vomiting, ataxic gait, facial muscle weakness, hearing loss, dysphagia, dysarthria, hemiparesis, visual changes?
Definition
brainstem tumor
Term
What is the preferred treatment of brain tumors?
Definition
surgical removal
Term
Cerebral edema and rapidly rising ICP are possible complications of radiation therapy. What can be used to manage these?
Definition
high dose corticosteroids
Term
What is a method of delivering highly concentrated doses of radiation precisely at the brain tumor?
Definition
stereotactic radiosurgery
Term
A group of chemotherapeutic drugs called what are used to treat brain tumors?
Definition
nitrosoureas (ex BCNU, CCNU)
Term
What is the first oral chemotherapeutic agent found to cross the blood brain barrier?
Definition
Temodar
Term
What do you need to assess before giving Temodar? How should it be taken?
Definition
-neutrophil and platelet count
-on an empty stomach
Term
What is an opening into the cranium with a drill, used to remove localized fluid and blood beneath the dura?
Definition
Burr hole
Term
For how long s/p cranial surgery are frequent neuro status checks essential?
Definition
48 hrs
Term
Why is Phenergan typically not used with neurologically impaired pts?
Definition
it increases somnolence thus impairing accurate neuro assessment
Term
If the pt with cranial surgery has an incision over the anterior or middle fossa, what angle does the HOB need to stay at?
Definition
30-45 degrees
Term
If the cranial surgery pt has a posterior fossa incision or a Burr hole where should the HOB remain?
Definition
flat - 15 degrees
Term
What is the major positioning rule for a pt with a craniectomy? What should the RN do if excessive bleeding or clear drainage is noticed from the site?
Definition
-do not lay on the operative side
-immediately notify the surgeon
Term
Once the wound dressing is removed for the cranial surgery pt what should be used to clean the site?
Definition
antiseptic soap
Term
For the pt receiving cranial radiation, what recommendations are made if sun exposure is expected?
Definition
sunblock and head covering
Term
What is an accumulation of pus within the brain tissue from a local or systemic infection?
Definition
brain abscess
Term
What is the primary treatment of brain abscess? What is the secondary treatment if the primary fails?
Definition
-primary antimicrobial therapy
-drainage or removal
Term
How does meningitis causative organisms usually gain entry into the body?
Definition
upper respiratory tract or bloodstream
Term
What type of living condition increases the risk for spread of bacterial meningitis?
Definition
jail, college dorms, retirement homes
-anywhere that many people live in close proximity
Term
What are the 2 identifiable symptoms of meningitis?
Definition
photophobia and nuchal rigidity
Term
What are the general S&S of meningitis?
Definition
fever, severe HA, nausea, vomiting, nuchal rigidity, photophobia, decrease LOC, increased ICP
Term
Why can HAs from meningitis last for months after diagnosis?
Definition
that is the amount of time it takes the irritation and inflammation to completely resolve
Term
What tests should be done if meningitis is suspected? What is the definitive diagnostic test for meningitis?
Definition
-CT scan and blood culture
-LP
Term
What are the 2 usual treatments for bacterial meningitis?
Definition
antibiotics and corticosteroids
Term
What is the best way to prevent bacterial meningitis?
Definition
prevention of respiratory infections by vaccinations
Term
Why is Codeine usually given for pain d/t bacterial meningitis?
Definition
relieves pain without sedation
Term
Why must fever be aggressively managed in the pt with bacterial meningitis?
Definition
fever increases cerebral edema and frequency of seizures
Term
How should fluid loss be calculated for the pt with bacterial meningitis?
Definition
800 mL for insensible water loss and 100 mL for each degree over 100.4 F
Term
How soon following discharge for bacterial meningitis can normal activity be resumed?
Definition
several weeks
Term
What is the diet teaching for pts discharged after bacterial meningitis?
Definition
high protein, high calorie in frequent small meals
Term
What can help relieve the muscle rigidity after discharge for bacterial meningitis?
Definition
progressive range of motion and warm bath
Term
How can encephalitis be prevented?
Definition
mosquito control by eliminating water sources and insect repellant
Term
What is used to treat encephalitis?
Definition
Acyclovir and vidarabine
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