MedSurg Mod 6: CNS Disorders Flashcards
How are head injury, Increased ICP, intracranial surgery, seizure and other complications all interrelated?
Head Injury –> ICP, Seizures and Complications, Surgery
Intracranial Surgery Increased ICP and Seizures and other Complications
Increased ICP Seizures and Other complications
What is the one thing independent from most other CNS injury relationships
Spinal Cord Injury
Head Injury
involves trauma to the scalp, skull, and brain
It results in anything from a mild concussion to coma to even death
TBI
Traumatic brain injury
What is the most common cause of TBI
falls (any age)
Open TBI
Skull opened
Closed TBI
skull is still closed
Diffuse TBI
widespread damage
Focal TBI
localized damage to one brain area
TBI damage and what you see is dependent on ___ and ___
location and severity
Epidural Hematoma (Hemorrhage)
Above the dura and under the skull
a medical emergency that is usually due to a rupture of a middle meningeal Artery
can cause brain herniation leading to loss of consciousness and focal neuro deficits like pupil dilation and paralysis of an extremity
Subdural Hematoma (Hemorrhage)
Below the dura, Between the Dur and Brain
usually venous in origin - bleeding not as dramatic but this can be both good and bad
may be acute, subacute, chronic (elderly, people on anti coagulants)
Intracerebral Hematoma (Hemorrhage)
withIN the brain tissue
result of focused injury or system issues (focal rather than systemic)
Major risk factor is HTN –> CVA
Concussion
Global and Microscopic
Widespread homogenous impairment of brain cells (cells under perform)
No visible bleeding occurs
Confusion, irritability, Disorientation, and HA occur
harder to measure and no real fix just cures itself over time
Contusion
Localized and macroscopic
structural damage to cells (cells die)
effects peak 18-36 hours post injury
coup contrecoup injuries cause this
can increase ICP d/t bleeding
blurred vision, disorientation, unsteady gait, vomiting, slurred speech, and coma can occur
Just because evidence of damage is easier to see with a contusion does not mean…
it will tell what type of injury occurred like hypoxia, impact, foreign body etc - it just tells us there is cellular damage
Can a concussion and contusion occur simultaneously
yes
Damage at the brain cell level is not dependent on…
actual injury
Coup-Contrecoup injury
2 injuries from one impact - a rebound effect
a focal injury
commonly associated with a contusion occurring
Diagnosis for Head Injuries
CT or MRI - identifying and evaluating injuries to brain tissue
Skull X Rays - look at penetrating injuries to the skull and if skull is damaged
Angiography
What is the number1 concern of head injuries
bleeding and increased ICP
Medical care for Head Injuries
1 - Control ICP
- Reduce cellular demands
- Surgical intervention
- Minimize secondary injury
Intracranial Bolt (ICB)
Bolt put in brain tissue that can monitor ICP
Why may mechanical ventilation and a respiratory be used on a head injury patient
- To aid if respiratory centers are damaged or at risk and prevent hypoxemia: Lactic Acidosis increased –> increased vasodilation occurs to compensate –> increased ICP will occur!
- to prevent hypoxemia and hypercapnia as a result of cerebral vessel vasodilation causing increased ICP
Why do head injury patients sometimes undergo medically induced comas?
to decreased CNS activity and reduce too much work in the brain in order to reduce cellular demands
What is the secondary injury to watch for with head trauma that can skyrocket ICP
edema
Goals of Nursing Care of Head Injuryu
- Address acute issues like respiratory, cerebral circulation, safety
- Prevent and treat secondary complications like infection, pneumonia, skin integrity, safety, and positioning
- Prevent treat and minimize consequences via behavior, physical rehab like OT and PT, and education
What to do first for nursing care of head injuries
Assess all systems for direct impact (PRIMARY COMPRIOMISE):
a. Patent Airway and Optimal Breathing pattern –> Monitor O2 sat, respiratory rate, lung sounds, VS
b. Optimal Cerebral tissue perfusion –> monitor mentation
c. Appropriate fluid balance –> monitor labs for H&H and lytes
What to do second for nursing care of head injuries
Assess all symptoms for secondary impact (secondary compromise):
a. s/s of infection
b. complications
c. consequences
What is an important issue to teach patient and family about?
Post concussion syndrome
how difficult it is to measure concussion
when to monitor and notify MD
how changes depend on location and severity
What are the s/s of post concussion syndrome
HA
Dizziness
Lethargy
irritability
emotional lability
fatigue
poor concentration
decreased attention span
memory difficulties
intellectual dysfunction
How long does post concussion syndrome last
may last 1 week or 1 year even
When to monitor and notify an MD regarding head injuries post care?
Difficulty in awakening or speaking
confusion
severe HA
vomiting
unilateral weakness
Functions of Frontal Lobe
behavior
intelligence
memory
movement
Functions of Temporal Lobe
behavior
hearing
memory
speech
vision
Function of Parietal Lobe
intelligence
language
reading
sensation
Functions of Occipital lobe
vision
Functions of Brain Stem
Blood pressure
breathing
consciousness
heartbeat
swallowing
Function of Cerebellum
balance
coordination
Reasons Intracranial Surgery is Done
- Reduce elevated ICP
- remove tumor/foreign body
- evacuate a blood clot
- control hemorrhage
Ectomy
removal
Plasty
repair
Craniectomy
removal of part of skull to allow room for swelling
it gives access to brain tissue like an epidural hematoma or allow some brain swelling to occur
the skull pieceis either frozen or put in the peritoneum
Cranioplasty
Repair of the skull using a metal or plastic plate
Approaches for Intracranial Surgery
Supratentorial (above the tentorium fibrous tissue)
Infratentorial (below)
Medical Interventions to do Pre Operatively for Intracranial Surgery
Define diagnosis/surgical approach
general pre and post op considerations
medications - anti seizure, corticosteroids for edema, hyperosmotic agent (mannitol), diuretics, antibiotics, anti anxiety
Nursing interventions to do pre operatively for intracranial surgery
document baseline neurological status
routine pre operative care and education
continue with established care - diet, activity, medications, etc
Why give corticosteroids for intracranial surgery
to reduce cerebral edem
Why give hyperosmotic agents like mannitol for intracranial surgery
it pulls water into the bloodstreaam thus pulling fluid out of swollen brain tissue
Medical interventions to do post operatively for intracranial surgery
reduction of cerebral edema via mannitol and Decadron (a corticosteroid)
relive pain with narcotic analgesics
prevent seizure with Dilantin and valium
monitor intracranial pressure with an implanted ICP monitor
Nursing interventions to do post operatively for intracranial surgery
assess every hour the neurologic status via Glasgow coma scale or FOUR score, repsiratory status, ABGs, labs, VS, intracranial pressure readings (read ICP but not put monitor in)
proper positioning depending on surgical approach
routine post op care such as C-DB, I&O checks including tubes and ventilation, and dressings and drainage
Why must we check with the MD first regarding C-DB after intracranial surgery
it can increase the pressure in the chest and above into the head
ETT
endotracheal tube
breathing tube from ventilator
Glasgow Coma Scale
The most widely used method for evaluation of coma
simple
has a number of shortcomings such as limited utility in intubated patients and inability to assess brainstem reflexes
FOUR Scale (Full Outline of UnResponsiveness)
a more in depth assessment tool used on neuro unites
provides further neurological details (gives a full status)
better predictor of outcome
useful for intubated patients and assessing reflexes
What sort of score is better on the GCS
a higher score
What sort of things does the FOUR scale look at
more detailed things like eyes, motor response, brainstem response, and respiration
allows for checking someone who is not fully awake but to monitor best motor response they need to be awake
may be useful for someone comatose post op
Potential intracranial surgery post op complications
bleeding and hypovolemic shock
fluid and electrolyte disturbances
infection
increased ICP
seizures
Diabetes insipidus
SIADH
What are the 4 specific complications arising from surgery to the head
- Increased ICP
- Seizures
- Diabetes Insipidus (d/t damage)
- SIADH (d/t damage)
What is intracranial pressure
balance of brain tissue, blood and CSF