Neurologic Disease and Disorders Flashcards
What are the etiologies of a cerebrovascular accident (CVA) or stroke?
- (cerebral arethoma) fibrous atheromatous plaque occludes artery -> hypoxia
- (cerebral embolism) atrial fibrillation releases embolus, peripheral embolus, foreign body -> brain hypoxia
- (cerebral hemorrhage) aneurysm ruptures -> blood compresses local arteries
What are the clinical features of a cerebrovascular accident (or CVA)?
S/S:
- aphasia/dysphasia, confusion
- hemiparesis, dizziness, incoordination
- severe headache
- unequal pupils, diplopia
DIAGNOSTIC TESTS:
- MRI, CT, cerebral angriography, or EEG may be positive
What’s the treatment and prognosis for a cerebrovascular accident (CVA) or stroke?
TREATMENT:
- early aspirin or heparin
- cerebral angioplasty
- antiarrhythmic drugs
PROGNOSIS
- some permanent disability may remain
What are the etiologies of a transient ischemic attack (TIA)?
cholesterol emoblism, fibrin plaque embolism, aterial spasm, or minute blood clot -> temporary cerebral ischemia -> embolism broken down
What are the clinical features of a transient ischemic attack (TIA)?
S/S:
- aphasia/dysphasia, confusion
- hemiparesis, dizziness, loss of balance
- headache
- blurry vision, diplopia, unequal pupils
- lasts for <24 hrs
DIAGNOSTIC TESTS:
- MRI, CT, EEG. and carotid ultrasonography may show carotid embolus
What’s the treatment and prognosis for a transient ischemic attack (TIA)?
TREATMENT:
- aspirn, heparin
- possible cerebral angioplasty
PROGNOSIS:
- varies, but future CVAs may occur without lifestyle changes
What are the etiologies of an epidural and a subdural hematoma?
- (epidural) blunt force trauma -> ruptures blood vessels above dura mater
- (subdural) sudden acceleration or deceleration -> ruptures blood vessels between dura and arachnoid maters
What are the clinical features of an epidural hematoma and a subdural hematoma?
S/S:
- (epidural) drowsiness, possible coma, nausea, vomiting, hemiparesis, and headache within 3 hours
- (subdural) same as epidural, but delayed onset
DIAGNOSTIC TESTS:
- CT, MRI, and cerebral angiography may reveal hematoma
What’s the treatment and prognosis for an epidural hematoma and a subdural hematoma?
TREATMENT:
- craniotomy and/or trephination
PROGNOSIS:
- risk of brain hypoxia and death
What’s the etiology of a cerebral concussion?
direct blow to head -> shears neurons and interferes with membrane potential -> abnormal electrical
What are the clinical features of a cerebral concussion?
S/S:
- loss of consciousness with shallow breathing and slow pulse
- amnesia, irratbility, nausea, headache, diplopia, photophobia, irritability
DIAGNOSTIC TESTS:
- CT rules out contusion
What’s the treatment and prognosis of a cerebral concussion?
TREATMENT:
- quiet bed rest
PROGNOSIS:
- varies with insult
- risk of postconcussion syndrome
What’s the etiology of a cerebral contusion?
direct blow to head -> shearing force ruptures blood vessels
What are the clinical features of a cerebral contusion?
S/S:
- increasing drowsiness, irritability, hemiparesis, headache
DIAGNOSTIC TESTS:
- CT scan reveals hemorrhaging
What’s the treatment and prognosis of a cerebral contusion?
TREATMENT:
- craniotomy
PROGNOSIS:
- unpredictable
- complications of intellectual impairment, paralysis, and epilepsy
What are the etiologies of a depressed skull fracture?
ETIOLOGY:
1) direct blow to head -> depressed skull fracture (section pressing into brain)
What are the clinical features of a depressed skull fracture?
S/S:
- (unchanging) confusion, irritability, nausea, vomiting, hemiplegia, loss of balance, severe headache, visual disturbances
- battle sign, raccoon eyes, bleeding from ears, eyes, or nose
DIAGNOSTIC TESTS:
- cranial x-ray may reveal fracture
- CT may reveal cerebral edema
What’s the treatment and prognosis of a depressed skull fracture?
TREATMENT:
- craniotomy
PROGNOSIS:
- varies with insult, but best with prompt treatment
What are the etiologies of paraplegia and quadreplegia?
ETIOLOGY:
- (Paraplegia) vertical compression or hyperflexion of T1-L5 vertebrae
- (Quadriplegia) hyperflexion or hyperextension of C5-C7 vertebrae
What are the clinical features of paraplegia and quadriplegia?
S/S:
- (Paraplegia) paralysis and numbness below waist, loss of bowel/bladder/sexual function
- (Quadriplegia) trunk, upper limbs, and lower limbs paralyzed/numb, loss of bowel/bladder/sexual function, bradycardia and respiratory issues
DIAGNOSTIC TESTS:
- spinal radiography, MRI, and CT may reveal damage
What’s the treatment and prognosis of paraplegia and quadriplegia?
TREATMENT:
- spine board, corticosteroids, hypothermia of area
PROGNOSIS:
- outcome variable, but better with earlier treatment
What are the etiologies of degenerative disk disease?
ETIOLOGY:
1) aging leads to reduced fluid in disk -> mechanical friction of disk -> inflammation and possible nerve root canal stenosis
What are the clinical features of degenerative disk disease?
S/S:
1) intractable pain along dermatome, numbness and weakness, possible incontinence
DIAGNOSTIC TESTS:
- MRI and myelography may reveal disk status
- electromyography may reveal nerve function
What’s the treatment and prognosis of degenerative disk diseases?
TREATMENT:
- NSAIDs, lidocaine patches, opioids
- transcutaneous electrical nerve stimulation (TENS), or implantable spinal cord stimulator (SCS)
PROGNOSIS:
- variable
- possible sequlae of spinal stenosis
What are the etiologies of a bulging disk and a herniated disk?
age or trauma ->
(if bulging) annulus fibrosus compresses spinal cord
(if herniated) annulus fibrosis ruptures -> nucleus pulposus compresses spinal cord
What are the clinical features of a bulging disk and a herniated disk?
S/S:
- radiating pain down lower extremities, numbness or paresthesia, dermatome weakness
DIAGNOSIS:
- positive straight leg test
- MRI, CT, or myelography reveals condition
What’s the treatment and prognosis of a bulging or herniated disk?
TREATMENT:
- NSAIDs, corticosteroids
- percutaneous diskectomy, microdiskectomy, diskectomy, or laminectomy
PROGNOSIS
- degeneration unavoidable
- usually good with treatment
What are the etiologies of a sciatic nerve injury?
- (degenerative) osteoarthritis -> spinal stenosis and osteophytes
- (herniated or bulging disk) nucleus pulposus compresses sciatic nerve
- (trauma) body mechanics, gunshot, or stabbing leads to sciatic nerve damage
What are the clinical features of a sciatic nerve injury?
S/S:
- continuous/intermittent pain along lower back and legs, numbness, weakness
DIAGNOSTIC TESTS:
- positive straight leg test
- MRI, CT, or myelography may reveal stenosis
What’s the treatment and prognosis of a sciatic nerve injury?
TREATMENT:
- physical therapy, NSAIDs, corticosteroids, muscle relaxants, opioids
- (if herniating) percutaneous discectomy, microdiskectomy, complete diskectomy, lumbar laminectomy, or chemonucleolysis
PROGNOSIS
- varies with insult, but disk degeneration is unavoidable
What are the etiologies of Parkinson’s Disease?
ETIOLOGY:
- linked to death of substantial nigra and nerve endings -> insufficient dopamine and norepinephrine
What are the clinical features of Parkinson’s Disease?
S/S:
- tremors, dyskinesia (involuntary movements), shuffling gait, loss of coordination, gradual personality changes
DIAGNOSTIC TESTS:
- neurologic examination may suggest Parkinsons
What’s the treatment and prognosis of Parkinson’s Disease
TREATMENT:
- levodopa
- deep brain stimulation (DBS)
PROGNOSIS:
- death may occur 10 years after diagnosis
What are the etiologies of Huntingon’s Chorea?
autosomal dominant gene on chromosome 4 -> unclear mechanisms -> progressive neural death
What are the clinical features of Huntington’s Chorea?
S/S:
- loss of motor control, loss of balance, difficulty swallowing, gradual personality changes (behavioral, emotional, and memory changes)
DIAGNOSTIC TESTS:
- neurological examination suggests Huntingtons
- CT reveals brain atrophy
What’s the treatment and prognosis of Huntington’s Chorea?
TREATMENT:
- haloperidol, atypical antipsychotics, benzodiazepines
PROGNOSIS:
- death may occur 10 to 30 years after diagnosis
What are the etiologies of amyotrophic lateral sclerosis?
uncertain, but possibly autosomal traits -> degeneration of motor areas and neurons
What are the clinical features of amyotrophic lateral sclerosis (or ALS)?
S/S:
1) fasciculations, motor atrophy, dysphonia, dysphagia, dyspnea
DIAGNOSTIC TESTS:
- electromyography and muscle biopsy suggests ALS
What’s the treatment and prognosis of ALS?
TREATMENT:
- riluzole, muscle relaxants
PROGNOSIS:
- death may occur 6-10 years after diagnosis
What are the etiologies of peripheral neuropathy (or peripheral neuritis)?
nutritional deficiencies, infections, inflammatory conditions, metabolic disorders, chronic alcohol intoxication -> PNS degeneration
What are the clinical features of peripheral neuropathy?
S/S:
- numbness and weakness in hands and feet, muscular atrophy, loss of balance
DIAGNOSTIC TESTS:
- blood tests and radiography may help reveal underlying cause
What’s the treatment and prognosis of peripheral neuropathy?
TREATMENT:
- treat underlying causes
- anticonvulsants, tricyclic antidepressants
PROGNOSIS:
- relieved with treatment
What is the pathogenesis of poliomyeletitis and subsequently post-polio syndrome?
poliovirus enters through sinuses -> gastrointestinal tract -> reproduces in lymphoid tissue -> hematic spread to anterior horn cells of spinal cord