Mod 2 - Neurolgical Assessment of the Critically Ill Flashcards
3 common sources of error from equipment?
artifact (external factor aka patient moving)
factious event (real but not accurate to the overall pic)
instrument drift (something happens to the device)
LOC is usually asses by oriented x3, what is the most important point to emphasis about the test?
what would you do if the patient can’t respond (i.e intubated?)
Check how the patient responds to stimuli
-Central stimulation
-peripheral stimulation
what is a basic assessment of a neurological assessment?
LOC
Motor examination
Posturing
4 common levels of LOC
full consciousness
Obtunded
Stupor
Coma
what would you score the verbal response for a patient that is intubated for GCS?
Default 1 for no response with a “T” placed after the score
Gagging and swallow reflex is protective reflex, which nerve is it apart of?
Glossopharyngeal (Cranial nerve 9)
-sensory, taste is also included
Which nerve is mostly associated with a cough?
Vagus (cranial nerve 10)
It is a protective motor reflex
On a unconscious patient, how do you check for a cough reflex?
Poke the carina during suction (trigger it)
How would you perform a: Motor examination?
Central stimulation is the most common way to check (aka eternal rub, pain stimulation).
Posturing is a response to what?
noxious stimulus, the decorticate and decelerate position are responses the we gauge for GCS
What is noxious stimuli?
A stimulus strong enough to threaten the bodies integrity (cause damage to tissue)
Usually serves as a test response to pain
What do you look for when evaluating brainstem reflexes?
Who do we check brainstem reflexes for?
Evaluated for stuporous or comatose patients to determine if the brain stem is intact
if not intact, evaluated to determine if brain death has occurred.
what factor can affect reflexes?
sedatives, analgesics, and paralytics can interfere with the ability to assess motor function and reflexes
Pupil/pupillary reflex: Anisocoria
One pupil is larger than the other
Why do you give people anti cholinergic drugs with someone who is breathing normally?
Anticholinergics:
relax and enlarge (dilate) airways in the lungs, making it easier to breath (bronchodilator).
Protect the airways from spasms that can suddenly cause the airway to become narrower (bronchospasm).
Reduce mucus production in airways
Pupil/pupillary reflex: Anisocoria
One pupil is larger than the other
ometimes the first sign people notice of a life-threatening underlying condition like a stroke or aneurysm
TLDR; could indicate a brain bleed
Pupil/pupillary reflex: myosin
pontine hemorrhage, narcotics
Pupil/pupillary reflex: mydriasis
brain injury, anticholinergics
Pupil/pupillary reflex: mid-position fixed pupils
severe cerebral damage
how are pupil/pupillary reflex’s tested?
passing a bright light in front of both open eyes and watching for over movement
Pupil/pupillary reflex: what is a ominous sign?
Eyes are fixed and dilated -> could indicate brain death.
what do we test for during oral care and suctioning?
gag and cough
Which nerves are checked for with someone with a spinal injury?
Patellar reflex - deep tendon reflexes
What reflexes are tested in a comatose patient or someone with a lower spinal chord injury?
Plantar reflex - superficial reflexes
what stimulation type is bad motor reflex test?
peripheral stimulation (nail bed pressure), could indicate a reflex vs. motor function.
How many cranial and spinal nerves are there?
12 cranial nerves
31 spinal nerves
Add slide 6
Lemon determines what?
potential difficulty for intubation
why are do you log roll a patient?
The patient has a C-spine injury (potentially)
To assess the patients back
or patient is vomiting
Complications with inadequate sedation
- Anxiety
- pain
- pt-vent dysynchrony
- agitation - self removal of tubes + catheters
- myocardia ischemia
family dissatisfaction
Complications of excessive sedation
- Prolonged mech. ventilation and length of ICU stay
- Tracheostomy
DVT, VAP
Additional testing - Inability to communicate
Cannot evaluate for delirium - Resp. depression: sedatives can slow down the rate of breathing = hypoxia + hypotension
- Delirium
Richmond agitation sedation scale (Rass) what sedation level do we ideally want patients at (in the ICU)
-3
most are kept at -3 to -5
What is delirium a sign of?
Brain failure:
- loss of higher brain function.
- Oversedation or other drugs
- what is delirium?
- what is the time frame of action.
- Acute brain dysfunction accompanied by reduced ability to sustain or shift attention.
- Developed over a short period of time and tends to fluctuate
Why is delirium a issue?
indicates a underlying medical problem
Why do we assess for delirium?
helps to optimize the delivery of sedatives and analgesics ( i.e can you ween off? )
-helps patient outcome
how do we assess delirium?
- The confusion assessment method for the ICU (CAM-ICU)
- Intensive care delirium screening checklist (ICDSC)
-used in Calgary
What pneumonic is used to determine causes for delirium?
Edit
Think delirium - need to be able to list 5 causes
Think delirium pneumonic (slide 18)
Edit
what is “SAT”
spontaneous awakening trial
- Evaluate a patient’s readiness to be weaned off sedation and mechanical ventilation.
- less accumulation of sedative drug and metabolites…decreases risk of delirium
- provides opportunity for more effective weaning from ventilation
Review and add slides 19 & 20 up to slide 23
Methods to assess a patients condition
(2)
hint unconscious vs. conscious
GCS - used to gauge responsiveness w/o much info for the first time. (outside ICU)
RASS - used w/o some info and target a level of responsiveness (for sedation)
We actively assess a look for what reflex to gauge airway protection?
Gag and cough reflex
Nerves 9 and 10
what is the target sedation for a patient?
-4
- we aim keep it at -4 they’re still semi rousable/responsive
- Give the min (not overdosing) to remain sedated.
What is delirium described as?
Acute brain dysfunction: has 2 hallmarks
- indicator/marker of other issues.
- inability to shift attention
Wake up safety screen?
- no active seizures
- no active alcohol withdrawal
- no active agitation
- no active paralytic use
- no myocardial ischemia (24h)
- normal intracranial pressure
Breathe safety screen?
No active agitation
oxygenation saturation > 88%
FiO2 <50%
PEEP < 7.5 cmH2O
no active myocardial ischemia (24hr)
no significant vasopressor use
What is the ABCDE protocol?
help break the cycle of over sedations and prolonged ventilation
Breakdown of ABCDE protocol?
ABC = awakening and breathing coordination
(wake up and breath)
D = delirium management/intervention
E = early exercise and mobility
Normal (ICP) - intraranial pressure
10-15 mmHg
small fluctuations are normal
> 20 is considered intracranial hypertension
CPP = MAP - ICP
what relation does this describe?
describes cerebral perfusion in relation to mean arterial pressure and intracranial pressure.
If ICP is within 40-50 mmhG of MAP (the difference).
when ICP is approx. = to MAP -> Perfusion stops and brain dies.
Placements for diagnostic measures/interventions of ICP (monitoring) (5)
needs edit
1.intraparenchymal
2. subarachnoid
3. ventricular
4 subdural
5. epidural
Mainly via pascals principle?
membranes that line the brain (3)
meninges
deramater - outer most membrane of brain
subarachnoid matter? -
peamater
2 types of ICP monitoring systems
fluid filled systems
solid-state systems
what is SjVO2? what is its normal value?
jugular venous oxygen saturation
Normal value is 50-75%
jugular venous oxygen saturation
approximates amount by the amount that goes into the brain.
measured via specialized catheter
what does jugular venous oxygen saturation (SjvO2) reflect?
the balance between cerebral oxygen therapy delivery and the cerebral metabolic rate of oxygen
Decreased jugular venous oxygen saturation (SjvO2) can indicate?
decreased cerebral blood flow; cerebral hypoperfusion and possible ischemia.
increased cerebral metabolic rate (febrile, seizure)
arterial hypoxemia
Increased jugular venous oxygen saturation (SjvO2) indicates?
reduced cerebral metabolic rate
-hypothermia, sedatives, brain death
What is metabolic rate a reflection of
increased O2 consumption
Head injuries for jugular venous oxygen saturation (SjvO2) patients can diagnosis early what?
ischemia
why do you cool the body down to reduce metabolic rate?
To cause hypothermia, to slow the bodies metabolic rate.
What is cerebral oximetry
a non-invasive method to determine saturation or determine cerebral oxygenation (or other locations)
can indicate underlying conditions
mostly used in the OR
what is a Licox monitor?
is a monitor connected to a catheter that is inserted in the brain tissue.
measures brain tissue oxygenation (PbtO2)
for patients w/trauma/neuro brain injury