Neurological Conditions Flashcards
Increased Intracranial Pressure
Swelling of the brain, you would see an increased BP, decreased MAP, slow breathing
What are the layers of the meninges?
Dura Mater: outer layer, tough, thick, and firbous
arachnoid: thin, intermediate layer
pia matter: delicate, internal, vasculated layer
Cerebral Spinal Fluid
Located between the arachnoid and pia matter
Cushions the brain and spinal cord
Constantly absorbed and replenished
Normal amount is 100-150 mL
What is the Monroe-Kellie Hypothesis?
Cerebral spinal fluid, intravascular blood, and brain tissue must all exist in equilibrium. If there is a change in any of these, it will result in IIP.
What is normal ICP?
5-15 mmHg
At what level will ICP require treatment?
> 20 mmHg
What does the MAP tell us?
It is the average measurement of the systemic arterial pressure. Reflects the perfusion pressure. It is a better indicator for perfusion than the systolic BP.
What is the normal MAP value?
65-105 mmHg`
At what level MAP is perfusion to vital organs severely jeprodized?
<50 mmHg
How to calculate MAP?
Systolic BP + 2(Diastolic BP)/3
What is cerebral perfusion pressure (CPP)?
The pressure required for the heart to supply blood to the brain
Increased ICP leads to decreased CPP and decreased blood flow to the brain
How do you calculate the CPP?
MAP-ICP
What is normal CPP?
50-100 mmHg
What level CPP will cause irreversible neurologic damage?
<50 mmHg
What causes IIP?
- intracranial mass lesions (tumors)
- cerebral edema
- increased CSF production
- decreased CSF absorption
- obstructive hydrocephalus
- obstruction of venous outflow
- idopathic ICH
Cushing’s Triad
CNS Ischemic response reflex, initiated by hypothalmus
- HTN
- bradycardia because of compression of vegas nerve
- bradypnea because of compression of brain stem
IIP Clinical Manifestations
ALOC - most sensitive indicator
-headache, drowsiness, pupillary changes, widening pulse pressure, purposeless movements, hyperthermia (late stage), posturing
Decorticate Posturing
Limbs pulled towards core. Lesions above brainstem
Decerebrate Posturing
Lesions of the brain stem
Limbs extended and rigid.
IIP Diagnostic Tests
During physical exam check pupils - they will be dilated
Spinal Tap - after spinal tap lay flat on back for 4-6 hours
MRI
CT Scan
Mannitol
Osmotic Diuretic, pulls h2O out of brain. It begins to lower ICP in 1-5 minutes. Measure I&O while on it - normal urine 30 mL/hour
Thins blood
Starting dose 1.5-2 g/kg IV infusion
IIP Management
Keep O2 sat above 95, continuous pulse ox
Monitor fluid so BP doesnt drop too low
Keep head of bed at atleast 30 degrees to maximize venous outflow
Thermoregulation - no fever because it increases ICP. Shivering also inreases ICP
Stool Softner
Anti-Seizure medication
IIP Surgical Management
- Evacuation of blood clot
- Resection of a tumor
- CSF diversion: ventriculostomy drain 1-2 mL
Traumatic Brain Injury
Injury resulting from external force
Primary: direct result from mechanical injury at time of accident
Secondary: physiologic response to the initial injury
What are types of penetrating injuries
open head wound, focal damage around injury site, skull fractures, lacerations
What are types of non-penetrating injuries?
closed injuries. Concussion, contusions
Types of skull fractures
Open facture: scalp open
Closed fracture: scalp closed, could be depressed
Basal: most serious, effects base of skull. CSF drainage
What is a coup and countre coup injury?
Head hits front of skull and then rebounds and hits the back. Common in car accidents
What is a laceration head injury?
Tears in brain tissue or blood vessels of brain. It can cause destruction of brain tissue and increased ICP.
Most common result of bullet/stab
Diffuse Axonal Injury
most intense
traumatic shearing forces lead to tearing of nerve fibers in the white matter.
Caused by shaking or strong rotation of the head by physical forces
Secondary Traumatic Brain Injury
Ischemia, hypoxia, hypotension/HTN, cerebral edema, IICP, hypercapnia, meningitis, epilepsy, biochemical changes
TBI Clinical Manifestations
headache, memory problems, blurred vision, dizziness/fatigue, sleeping difficulties
serious: persistent headache, profound confusion, slurred speech, seizure, coma
Neurological/Musculoskeletal Assessment
Pupillary, check for consensual and accomodation
Check mental status
Check or sensory function like stergonosis (tell you what hand an item is in), facial movements, light touch (with cotton ball), graphesthesia (describe what is in hand
ROM (active - no help passive - with help)
Romberg test (look for sway)
Tandem (walk heel to toe)
What is a concussion?
Most common and least serious TBI. Low velocity injury resulting in functional deficits without pathological injury.
What is the best possible Glasgow Coma Score?
4 points - spontaneously opens eyes
5 points - oriented to time, place, and person
6 points - obeys commands
What criteria is considered a mild TBI?
13-15 Glasgow coma score
< 30 minutes loss of conscious or <24 hours amnesia, < or equal to 24 hours AOC
What criteria is considered a moderate TBI?
9-12 Glasgow coma score
> 30 minutes loss of consciousness, or > 24 hours amnesia, > 24 hours AOC
What criteria is considered a severe TBI?
3-8 Glasgow coma score
> 24 hours loss of conscious, >7 days amnesia, > 24 hours AOC
What Glasgow coma score is usually fatal?
3 or less
What are some diagnostic tests for TBI?
CT are done first, identify hemorrhage, bleeds in and around brain, blood flow, brain tissue swelling, and skull fractures
MRI follows to confirm which part of brain is affected and how severe. Can check microhemorrhage, brusing, gliosis, atrophy
What are the pharmacology options for TBI?
Osmotic diuretics, anticonvulsants, electrolytes, N-Methyl-D-Asparate Receptor agonist, stimulants, dopamine agonists, SSRI, Antipsychotic, muscle relaxer, pain relievers
What do osmotic diuretics do for TBI? What is an example?
Lower intracranial pressure by withdrawing water. Mannitol is an example. This is the most common drug used for TBI
What do anticonvulsants do? What are an example?
Prevent seizures because seizures increase ICP. Gabapentin - brand name neurontin
What do NMDA drugs do?
Prevent hyperactivity and secondary injury
What do barbiturates do? What is an example?
They are sedatives/anti-seizure. Phenobarbitol is an example.
What do calcium channel blockers do for TBI?
decrease blood pressure by preventing blood vessel spasm
What do dopamine agonist do for TBI? What are examples?
increase amount of dopamine. Improve alertness. Carbidopa, levidopa
What do SSRIs do? What is an example?
help with serotonin levels. Treat emotional distress. Prozac, floxitine, zoloft, celexa
What is a craniotomy?
Surgical opening into cranium
What is endoscopic ventricuolostomy
Drilling of a hole into fluid filled ventricle to rain it for pt. with hydrocephalus
What is Ventriculoperitoneal Shunt Surgery?
Shunt is put in ventricles to drain fluid into circulation - for hydrocephalus
What is a decompressive craniectomy?
For increased ICP. Remove a part of the skull so more area for brain to grow
What is a cranioplasty?
Repair of the skull
What is the most common complication of TBI?
Irritability
What are some nursing priorities for TBI?
Establish a baseline for the patien
Airway/breathing (ABG’s)
vital signs - maintain CPP, Cushing’s Triad
Early detection of subtle changes, report small changes immediately
Positioning
Neurological examinatiosn
*have suction ready at bedside incase of aspiration
What is complete spinal cord injury?
both sensory and motor functions are lost
What is an incomplete spinal cord injury?
some function remains
What is tetrapalegia/quadriplegia?
paralysis of arms and legs
What is paraplegia?
paralysis from waist down
what is hemiplegia?
paralysis on one side
what is triplegia?
paralysis of 3 limbs, one arm and both legs
What will an injury to cervical - neck, result in?
tetraplegia, quadriplegia. Most severe of spinal cord injuries
What will thoracic injury result in?
paraplegia
What will lumbar injury result in?
some loss of function in hips and legs. Will result in little or no voluntary control in bowel or bladder
What will sacral injury result in?
S1 - hips and groin
S2 - back of thighs
S3 - medial buttock
S4-S5 - perineal
What are some risk factors for spinal cord injury?
male, age 16-30, alcohol use, risky behavior, some dseases
What is emergency care for spinal cord injury?
Cervical collar, back board
What are some medications for spinal cord injury?
pain relievers, muscle relaxer, corticosteroids
What are some surgical options for spinal cord injury?
craniotomy, decompressive laminectomy
What is the pathophysiology of a stroke?
blood flow to an area of the brain is cut off
What are some risk factors for a stroke?
> 65, men, HTN, DM, smoking
What is an ischemic stroke?
Caused by a clot/blockage to the brain. Can be transient, thrombotic, or embolic
What is a hemorraghic stroke?
Bleeding into brain. Artery into brain leaks blood or ruptures. Can be a intracerebral hemorrhage, or subarchnoid hemorrhage
What is the etiology of an ischemic stroke?
Arrythmia/heart valve disease/infection HBP, DM, HLD intracranial disease (chronic HTN) cancer, blood clotting disorder autoimmune disease sickle cell anemia HIV
What is a transient Ischemic attack?
a mini stroke. blood flow to the brain is blocked for only a short time. caused by blood clots. if not treated 10-15 % will have a major stroke within 3 months
What is a penumbra? How is it treated?
It is the reversibly damaged brain around the ischemic core. Survival depends on timely return of adequate circulation, degree of cerebral edema, alteractions in local blood flow
Less than 4 hours after stroke symptoms start TPA.
What should TPA be started for a stroke?
Within 4 hours of stroke symptoms
What is the nursing goal of hemorrhagic stroke?
Maintain cerebral tissue perfusion
What is the etiology of hemorrhagic stroke?
HBP, CAD, brain aneurysm, heart defects/failure, arteriovenous malformation, bleeding disorders
What is an intercerebral hemorrhage?
bleeding within the brain, artery in brain bursts, flooding surrounding tissue with blood. most common