Lecture 12: Neuro Flashcards
Neurologic Exam in the ED
* Neuro Exam should include what?
- Mental Status Testing
- Higher Cerebral Function
- Cranial Nerves/Brainstem testing
- Sensory Exam
- Reflexes
- Gait (if possible)
- Cerebellar testing
Brain Box
* What are the parts of cerebral hemispheres?
* What are the parts of diencephalon?
Cerebral Hemispheres (Cortex)
* LEFT HEMISPERE IS DOMINANT FOR ALL RIGHT-HANDED AND 80% OF LEFT-HANDED POPULATION
Diencephalon (Pituitary, Optic Chiasm)
* Thalamus
* Hypothalamus/Subthalamus
Brain Box
* Brain Stem parts?
* What structure is for movement?
Brain Stem (M/P/M) – cranial nerve nuclei are there
* Medulla (lower part of brainstem/respiratory center etc.)
* Oculovestibular (cold water testing)/Oculocephalic Reflex (doll’s eyes movement)
Cerebellum
Where is broca’s and wernicke’s area?
- Broca: Frontal lobe
- Wern: Temporal Lobe
What sign is for cerebellum?
Confirmed by getting what?
- Cerebellum – romberg sign: positive when the patient is unable to maintain balance with their eyes closed
- Confirm by getting CT
Higher Cerebral Function
* What happens when dominant hemisphere involvement?
Language and Dysphasia or Aphasia
* If Dominant Hemisphere involvement
What the two types of dysphasia?
- Receptive: does the patient understand what’s being said (wernicke area – temporal lobe)?
- Expressive: Can understand but cant speak (Broca – frontal lobe).
Define:
* Nonfluent aphasia –
* Fluent aphasia –
* Paraphrasic –
- Nonfluent aphasia – halting, slow speech
- Fluent aphasia – gibberish (vocabulary lost)
- Paraphrasic – choice of incorrect words
Cranial Nerves:
* What is teh corneal reflex?
* What is the pupillary response?
Corneal Reflex
* CN 5,7
Pupillary Response
* CN 2,3
* About 20% of population has anisocoria
Cranial Nerves
* Why is VII important?
* EOM cranial nerves?
VII important in emergency neuro exam
* Face Drooping to one side/forehead spared (central)
* Bells palsy will involve the entire face
EOM’s
* CN 3,4 AND 6 (and even 2)
Cranial Nerves
* What do you do for bells palsy?(3)
Bells palsy – admit, get steroids and get a CT to r/o tumor. Its probably a viral cause
Motor Exam
* Note what?
* What type of drift?
* Quantify what?
* Why do you do relexes?
Note atrophy, contractures – chronic process, not acute
Pronator drift (Frontal Lobe) – contralateral frontal lobe
Quantify weakness
Reflexes: (Pathologic) – All are UMN.
* Important to note Babinski, Clonus
* CNS/Cord
Cerebellar
* How do you test it?
* What are the two types of vertigo?
RAHM, Finger to Nose, Nystagmus (noted with CNs)
* Central Cause Vertigo – Vertical Nystagmus (Pathologic)
* Peripheral Cause Vertigo – Horizontal Nystagmus
Cerebellar
* What is an important finding?
* Coordinated what?
* Consider what with cerebellar dysfunction
- Gait: Ataxia is very important finding
- Coordinated fine muscle movement
- Consider posterior circulation (posterior cerebral vessels) issues with cerebellar dysfunction
- How can you if the HA is a primary or secondary HA?
- How can you tell who needs to get worked up for a HA?
- HA with facial pain-> Sinusitis and without facial pain-> can be anything
- Anyone with chronic HA with any focal changes (muscle weakness, vision changes, AMS), hx of vascular issues, abnormal hx
HA
* When is imaging not recommended? How do you treat it?
No imaging in primary headaches isindicated with normal neurovascularexam and without atypicalfeatures/redflags.
* Treat supportive with NSAIDs or combination medications (Fioricet)
* I like triple cocktail: Metoclopramide, diphenhydramine, ketorolac
HA
* Primary or secondary headache work-up rarely requires what? What is the exception?
* What may be useful depending on hx or clinical presentation?
Primary or secondary headache work-up rarely requires CT imaging unlessthey have Hx of hypertension and new neuro deficits
* Excludes hemorrhage only (angiogram)
MRI with perfusion maybe usefuldepending on history or clinicalpresentation
ACEP clinical policy
* In general, they recommend CT scan for what?
* All patients with what need to have a CT and possible LP?
- In general, they recommend CT scan for new focal deficits, acute sudden onset of headache, worsening off-baseline headache, in HIV-positive patients (toxoplasmosis, viral enceph), patients older than 50 with a new headache (CAD) , and most traumatic headaches (Canadian head CT rules).
- ALL PTS WITH HYPERTENSIVE HEADACHE PRESENTATION NEED CT; IF CT IS NORMAL STRONGLY CONSIDER AN LP
Critical secondary causes of HA
* What should you think about when “worst HA of my life”
* What are two other causes?
SAH, “worst headache of my life”, thunderclap headache
* Aneurysm 90%
* A-V Malformation <10%
Meningitis
Brain Tumor with increased ICP (Increased Cranial Pressure)
Other critical secondary causes
* Vascular:
* CNS:
* Ophthalmic:
- Vascular (SDH, EDH, CVA, Temporal arteritis, carotid or vertebral artery dissection, ICH)
- CNS (encephalitis, cerebral abscess)
- Ophthalmic (glaucoma)
Subdural – venous origin
Epidural – arterial.
Other critical secondary causes
* Toxic:
* Endocrine:
* Metabolic:
- Toxic (carbon monoxide poisoning)
- Endocrine (pheochromocytoma)
- Metabolic (hypoxia, hypoglycemia, hypercapnia, high altitude cerebral edema)
What NIHSS score that does not get TPA
If less than 5 (very minor or TIA) or more than 20 (too severe and tpa wont improve anything) – not a TPA candidate
Venous Cavernous Thrombosis
* What are the sxs?(5)
* What is a risk factor?
- Headache and Facial pain
- Vision Loss
- Focal neurologic symptoms
- Change in consciousness
- Seizures
- RF: After getting J&J Covid vaccine
Venous Cavernous Thrombosis
* What is the txt?
Treated with Steroids/Antibiotics/Heparin.
* Sometimes stem from sinusitis
Homonymous Hemianopia
* What is it?
* Eyes look where?
* Left vs Right MCA?
Homonymous Hemianopia (loss of sight in ½ of visual field)
* Blindness in the same field of vision in each eye
* Eyes look toward the side of the stroke
* Left MCA: Right HH (looks to left)
* Right MCA: Left HH (looks to right)
HH Examples:
* What happens for damage site #1 and #2?
- Damage at site #1: this would be like losing sight in the left eye. The entire left optic nerve would be cut and there would be a total loss of vision from the left eye.
- Damage at site #2: partial damage to the left optic nerve. Here, information from the nasal visual field of the left eye (temporal part of the left retina) is lost.
HH Examples:
* What happens for damage site #3 and #4?
- Damage at site #3: the optic chiasm would be damaged. In this case, the temporal (lateral) portions of the visual field would be lost. The crossing fibers are cut in this example.
- Damage at site #4 and #5: damage to the optic tract (#4) or the fiber tract from the lateral geniculate to the cortex (#5) can cause identical visual loss. In this case, loss of vision of the right side.
Homonymous Hemianopia
* Differs from what?
Ischemic stroke
* What do you give?
* What are the two types? What do they require? Imaging?
Ischemic (80-85%) tPA patient pool within window
* Thrombosis: Develops gradually over minutes or hours. Most have Hx of Afib
* Requires anticoagulation
* A CT is 58% sensitive for infarction within the first 24 hours. MRI is82%sensitive.
* If the patient is imaged greater than 24 hours afterthe event,both CT and MR are greater than 90% sensitive.
- Embolic (A-Fib Hx)
* Anticoagulation outside of the window especially with LMWH increases risk of Sentinel Bleeds; and tends to cause distal occlusion not accessible by IR
* Should still give ASA
Hemorrhagic stroke:
* What do they not get?
* What are the types and causes?
- No tPA
- ICH
- SAH
* Berry Aneurysm 1st
* AVM (rare)
Stroke, TIA, Focal Conditions
* What do you have to get before giving treatment?
Have to get CT before giving any TPA.
What are the nonmodifiable and modifiable (well and less well documented)
Stroke Syndromes
* What resolves quickly?
* What happens with anterior cerebral artery?
TIA resolves quickly (certainly within 24 hours, usually much less)
Anterior Cerebral Artery
* Contralateral LE weakness greater than UE
Stroke Syndromes
* What are the sxs of middle cerebral artery?
* What are the sxs of posterior cerebral artery?
Middle Cerebral Artery (90%)
* Contralateral UE numbness; weaker UE than LE
* Aphasia(Dominant Hemisphere)
* Homonymous Hemianopsia (looks toward lesion)
Posterior Cerebral Artery
* Motor involvement is minimal/Cortical Blindness
Stroke Syndromes
* What is Vertebrobasilar Syndrome? What are the sxs? What are the crossed deficits?
Vertebrobasilar Syndrome – posterior circulation (vertebral/basilar arteries involved)
* Dizziness, vertigo, diplopia, dysphagia, ataxia, dysdiadochokinesia
* Crossed deficits: ipsilateral CN deficits with contralateral motor weakness/sensory loss
Stroke Syndromes
* What are the sxs of basilar artery occlusion?
Quadriplegia, “Locked-In” Syndrome” (complete muscle paralysis except upward gaze) – can only move eyes up
Stroke Syndromes
* What are the sxs of cerebellar stroke?
- Drop Attack – Sudden inability to stand
- Vertigo, headache, nausea, vomiting, neck pain
- Within 6-12 hours, cerebral edema, increased brainstem pressure, decreased consciousness, herniation, death
Get a CT to see a big bleed.
Stroke Syndromes
* Lacunar: What vessels are affected? What are the sxs?
Lacunar (Chronic Hypertension)/Pia vessels
* Pure Motor
* Pure Sensory
* Arterial Dissection
* Severe headache or neck pain for hours to days prior to onset of deficits
LONG-STANDING HX OF HYPERTENSION
IV Thrombolytic Tx in Ischemic CVA
* When can you give TPA normally? over 80 yo?
* When can you give TPA if large defect?
* How old must the patient be to given be able to recieve tPA?
- Onset is well established to be (4.5 hrs)
- 3hrs >80yo
- IR if large enough defect <24hrs
- Patient older than 18
IV Thrombolytic Tx in Ischemic CVA
* What are the exclusions?
* What NIHSS score is excluded?
- Multiple exclusions – minor symptoms, rapid improvement, prior ICH, seizure at onset, recent bleeding, recent MI, recent surgery, hypertension, previous recent stroke or head injury, current use of anticoagulants, recent use of heparin, low platelet count, blood glucose parameters
- Exclude NIHSS score of <5 or >20 because No benefit/>risk of bleed (6%)
IV Thrombolytic Tx in Ischemic CVA
* What must you get before tPA administration?
* What is the cutoff of INR?
- Must obtain CT brain w/o contrast to screen for hemorrhage prior to tPa administration
- Don’t give ASA until CT is done either
- INR: 7
Treatment:
* Patients with ischemic strokes who do not get thrombolytics and those with TIAs:
* TIA:
- Patients with ischemic strokes who do not get thrombolytics and those with TIAs: Give antiplatelets such as aspirin, dipyridamole, clopidogrel (plavix)
- TIA: consider need for endarterectomy if greater than 70% stenosis
Hemorrhagic Strokes: ICH
* Clinically looks like what?
* Cerebellar hemorrhage needs what?
* What are the sxs? What needs to be done?
- Clinically looks like cerebral infarction, may involve ventricles
- Cerebellar Hemorrhage (NEED Surgical Decompression)
- Sudden onset of dizziness, vomiting, truncal ataxia, unable to walk, gaze palsies, increasing stupor, progressing rapidly to coma and herniation without surgery – Get CT (look for white) and Sx ASAP
Hemorrhagic Strokes: SAH
* May have what on hx?
* What can happen earlier on and present as what?
* See blood where?
* Get what labs?
* May have what? (2)
- May have sentinel event elicited on history
- Small bleed earlier – could present as headaches
- Could be a sentinel bleed but within 6hrswhere you will be able to see blood in LP (yellow – Xanthochromia) or pink).
- Get CBC to make sure its not a traumatic LP – look at WBC in CSF (for every WBC there should be 700-800RBC’s).
- May have vomiting
- May have been precipitated by cough, intercourse
- CEREBELLAR BLEED IS TREATABLE WITH what?
- What happens if they are pregnant?
- If you think theres a stroke – can’t do what? Just do what?
- CEREBELLAR BLEED IS TREATABLE WITH SURGICAL DECOMPRESSION AND HEMATOMA EVACUATION
- Pregnant – get a CT with covered fetus in lead.
- If you think theres a stroke – can’t do LP (disqualifies them from getting TPA therapy). LP is done rarely to eval headache if CT is negative. Just do a CT.
Management of stroke
* What is important to know?
* What do you need to stabilize?
* What is stroke alert? What is important about CT with different strokes?
Family said normal at bedtime: no tPA because need a clear time frame
Hemorrhagic stroke:
* Control what?
* Elevate what?
* What can you give?
* What about cerebellar hem stroke?
Subarachnoid Hemorrhage (SAH)
* high risk for what?
* Maintain what?
* What reduces vasospasm? VASOSPASM OCCURS WHEN?
High risk for re-bleeding within 24 hours
Maintain MAP 110
Nimodipine (CCB) reduces vasospasm
* VASOSPASM OCCURS WHEN FREE BLOOD CONTACTS VESSEL WALL ( CONSTRICTION ) DECREASED BLOOD FLOW WORSENS
Subarachnoid Hemorrhage (SAH)
* Prophylax against what?
* Consider what?
Prophylax against vomiting and seizures with phenytoin (to keep ICP down)
Consider
* Angiography
* NEUROSURGERY CONSULT
Heat stroke
* Altered what?
* What is abnormal?
* Elevated what?
* What can be initally present? Hx what is present?
- Altered LOC
- Neurologic abnormality
- Elevated temperature (104)
- Initially sweating can be present but becomes absent if the disease process is allowed to progress. Historically anhidrosis is present.
Heat Stroke
* What is not present with heat exhaustion?
* May appreciate what?
* Highest documented core temperature in survivor was what?
* Upon what?
- No CNS involvement/AMS with Heat exhaustion
- May appreciate dilutional hyponatremia
- Highest documented core temperature in survivor was 46.5C (115.7 F)
- Upon cooling, cannot let them shiver
Contributing Medications-heat stroke
* Reduce the ability to do what? Examples?
* Decrease what? Examples?
* Increase what? Examples?
AMS, Coma
* What do you need to get?
* What cocktail? (3)
* Labs for what?(2)
- AMS
- ABC’s
- Vital signs, accucheck
- Cocktail (thiamine-alcohol, dextrose-DKA, narcan-OD)
- Labs for electrolytes, drug screens
AMS, Coma
* History and physical exam for clues of what?
* Pinpoint Pupils =
* Can pupils be dilated in opiate intoxication?
- History and physical exam for clues consistent with various etiologies (hepatic encephalopathy, uremia, CO2 narcosis, etc)
- Pinpoint Pupils = caused by Narcotic OD or Pons Bleed
- Can pupils be dilated in opiate intoxication? Yes because of benzo
Ataxia, gait disturbances
* What is the issue with romberg?
* Wide differential of etiologies and will need to sort through them:
Romberg
* unsteady with eyes open and eyes closed cerebellum
* worse with eyes closed – posterior column
Wide differential of etiologies and will need to sort through them: those that are caused by CNS problems and those that are not
Get CT if dizzy and some neuro abnormalities. Don’t if just dizzy.
Central Vertigo
* What are the causes? (4)
- Cerebellar CVA and Hemorrhage
- Lateral medullary CVA
- Vertebrobasilar Insufficiency
- Vertebral Artery Dissection
Central Vertigo
* What do you need to get?
image(CT) those whom you think may have central vertigo
Acute Vestibular Syndrome
* what are the sxs?
* May last how long?
* 25% are due to what?
- Rapid onset of vertigo, N/V, gait unsteadiness combined with head-motion intolerance and nystagmus
- May last days/weeks
- 25% are due to posterior circulation infarcts
HINTS Exam for Vertigo
* Stands for what?
* Differentiate between what?
* can only be performed when?
* Specificity is 96%, r/o what?
- Stands for Head Impulse-Nystagmus Test of Skew
- Differentiate between peripheral or central causes
- Can only be performed in a continuously symptomatic patient, not intermittent like BPPV
- Specificity is 96%, r/o stroke better than MRI in the first 48hrs.
HINTS Exam for Vertigo
* Involves testing of what? (3)
* Contraindicated in what?
Involves testing of
* Head Impulse (VOR): Vestibulo-ocular reflex function
* Nystagmus: fast component correlates to same direction gaze
* Skew: Cover/uncover of the eye
Contraindicated in trauma of head/c-spine, cervical dissections
What is the difference between head impulse in central and peripheral vertigo?
- Normal VOR can be seen in Central Vertigo when eyes move smoothly
- Abnormal VOR = presence of OR significant lag of corrective saccades = peripheral vertigo
Nystagmus
* What is the difference in peripheral and central?
- Unidirectional nystagmus and gaze is likely peripheral
- Bidirectional or rotary or vertical, all are likely central
Skew
* What is it?
Deviation of eye upon covering of contralateral eye, which corrects with uncovering
HINTS EXAM
Seizures: generalized
* Usually involves what?
* What are the two types?
Generalized (usually involves loss of consciousness)
* Grand Mal Tonic-clonic
* Absence (petit mal
Seizures: Partial (focal)
* What is present?
- Simple partial (no alteration of consciousness)
- Focal motor, sensory, visual, olfactory auras
- Complex partial (impaired consciousness)
Seizures
* Need to get what?
* Check for what?
- Need to get a good history from an observer
- CHECK FOR INCONTINENCE AND TONGUE LACERATION due to seizures
What are the causes of etiologies of reactive seizures?
Brief Discussion
* What do you give for active seizure in ED?
* What does a first seizure need?
* Febrile seizure in who?
Active Seizure in ED-> give benzo or atavan or in TB give B6
First Seizure (full work-up)
* Identify etiology (head trauma, underlying medical problem, ETOH, CNS infection)
* Admit for all of above as well as for persistent AMS, new focal abnormality, new intracranial lesion, acute head trauma, status epilepticus
Febrile Seizure usually in kids <5yo
Status Epilepticus
* What is it?
* The longer they contiune, what will happen?
Status Epilepticus
* What do you need to do for stabilization?
* What do you start with? Progress to what? Risk of what in children?
* Give what if eclamptic?
- AB(intubation)C, accucheck, IV, labs (electrolytes, tox screen)
-
Valium or Lorazepam to start with, progress to fosphenytoin (15-20 mg/kg)/ keppra/ phenobarbital/ propofol if needed after benzos are given, should consider pyridoxine
* risk of respiratory depression in pediatrics (be cautious) - Magnesium if eclamptic
Peripheral Lesions: Botulism
* Esp in what?
* What are the sxs?
* Paralysis?
* Normal what?
* What do you give?
Peripheral Lesions: Guilain barre syndrome
* What type of paralysis
* Antecedent wjhat?
* What are the ssxs?
* No what?
* Can develop what?
* What does LP show?
- ascending paralysis
- Antecedent viral illness (gastroenteritis)
- Numbness, tingling , followed by weakness (legs, thighs, arms) – Ascending – admit to ICU and intubate
- No deep tendon reflexes and no sensations
- Can develop respiratory failure
- LP shows high protein in CSF
Focal neuropathies LMN
* There are many common entrapment neuropathies that are reversible with appropriate treatment such as what? (2)
- Carpal Tunnel Syndrome (Median Nerve)
- Ulnar Nerve Entrapment
Focal neuropathies LMN: Bell’s palsy
* What is a common cause?
* Differentiate btw what?
* Clinically see what? In CVA, what is spared?
* What is and is not affected? What do you need to image?
* Treat with what?
Chronic Neurologic Disorders: Amyotrophic Lateral Sclerosis
* Widespread what?
* Degeneration of what?
- Widespread motor and respiratory dysfunction within weeks to months/Normal sensation
- Degeneration of Upper/Lower Motor Neurons
Chronic Neurologic Disorders: Myasthenia gravis (diplopia, ptosis)
* What are the sxs?
* What is impaired?
* What test needs to be done? What are the results?