Neuro (Exam 2) Flashcards
What is hydrocephalus?
excess CSF accumulation within the skull;
ventricles dilate and the brain and blood vessels become compressed
pressure thins the cortex causing brain damage
What are some causes of hydrocephalus?
CSF flow disruption (noncommunicating or obstructive hydrocephalus)
CSF NOT PROPERLY ABSORBED BY BLOODSTREAM (communicating hydrocephalus)
What are some risk factors for hydrocephalus?
prematurity
pregnancy complications
other congenital defects (especially neuro)
nervous system tumors
CNS infections
cerebral hemorrhage
severe head injuries
OFTEN FATAL IF UNTREATED
Name 6 manifestations for infants regarding hydrocephalus?
• unusually large head
• rapid increase in head size
• bulging fontanelle
• vomiting (projectile)
• lethargy
• irritability
• high-pitched cry
• feeding difficulties
• seizures
• eyes that gaze downwards
• development delay
Name 6 manifestations in older children and adults regarding hydrocephalus
• headache followed by vomiting and nausea
• blurred vision/diplopia
• sluggish pupil response to light
• eyes that gaze downward
• uncoordinated movements
• extreme fatigue
• slowing or regression of development
• memory loss and confusion
• urinary incontinence
• irritability or personality changes
• impaired performance at school or work
What is spina bifida?
the posterior spinous processes on the vertebrae fail to fuse, permitting the meninges and spinal cord to herniate (usually lumbar)
MOST COMMON NEURAL TUBE BIRTH DEFECT IN THE US, AMONGST WHITE AND HISPANICS
What are some maternal risk factors of spina bifida?
family history
folate deficiency
certain meds (antiseizures)
diabetes mellitus
pre-pregnancy obesity
increased body temp
What are some complications regarding spina bifida?
physical and neurological impairments
hydrocephalus
meningitis
learning problems
MANIFESTATIONS VARY
What is spina bifida occulta?
mildest form; defect may not be evident other than birthmark, etc.; usually no manifestations or defects
results in a small gap in one or more vertebrae; the spinal nerves and meninges do not usually protrude
What is meningocele?
RARE FORM; MENINGES PROTRUDE THROUGH VERTEBRAL OPENING
meninges and CSF form a sac on back, membranes can be removed by surgery with little damage
INFECTION/RUPTURE OF SAC CAN LEAD TO NEUROLOGICAL IMPAIRMENT
What can be done to confirm the absence of nerve tissue in the space in meningocele?
transillumination
What is myelomeningocele?
MOST SEVERE FORM OF SPINA BIFIDA; spinal canal remains open in lower back
MENINGES, SPINAL CORD, AND CSF PROTRUDE THROUGH LARGE OPENING AT BIRTH AND FORMS A SAC, TISSUES AND NERVES EXPOSED
What are some complications regarding myelomeningocele?
neurological impairment (paralysis)
bowel and bladder issues
seizures
What is cerebral palsy?
NONPROGRESSIVE DISORDERS AND PERMANENTLY AFFECT MOTOR MOVEMENT AND MUSCLE COORDINATION
MORE COMMON IN MALES, AA’s, LOWER SES
USUALLY DAMAGE TO CEREBELLUM DURING PRENATAL PERIOD BUT CAN OCCUR ANYTIME DURING FIRST THREE YEARS OF LIFE
What are some contributing factors towards cerebral palsy?
prematurity
low birth weight
breech birth
multiple fetuses
hypoxia
maternal/fetal hypoglycemia
cerebral hemorrhage
neurological infections
head injury
maternal infections during pregnancy
maternal exposure to toxins during pregnancy
severe jaundice
What are some complications regarding cerebral palsy?
balance and coordination issues
contractures
atrophy below the waist
scoliosis
malnutrition
communication issues and speech delays
learning difficulties
seizures
vision or hearing issues
urinary incontinence
constipation
osteoporosis
chronic pain
injury
Name 6 manifestations of cerebral palsy (15 total)
• persistence of early reflexes
• development delays
• ataxia (impaired coordination)
• spasticity
• flaccidity
• hyperreflexia
• asymmetrical walking gait
• unusual positioning of limbs
• excessive drooling
• difficulty swallowing
• impaired sucking
• speech issues
• facial grimaces
• tremors
• difficulty with precise motions
What is meningitis?
inflammation of the meninges and subarachnoid space; CSF can be affected
BACTERIAL (LIFE THREATENING) AND VIRAL (SELF LIMITING)
Meningitis: Infection or irritant triggers inflammation, leading to?
swelling of the meninges and increased intracranial pressure (ICP)
What are some risk factors regarding meningitis?
younger than 25
living in a community setting
pregnancy (listeria)
working with animals
immunodeficiency
Name 6 manifestations of meningitis (14 total)
- fever
- chills
- LOC changes
- nausea
- vomiting
- photophobia
- severe headache
- stiff neck
- agitation
- bulging fontanelles
- poor feeding or irritability in children
- tachypnea
- tachycardia
- rash
What are some complications for meningitis?
permanent neurological damage
seizures
hearing loss
blindness
speech difficulty
learning disability
behavior problems
paralysis
acute renal failure
adrenal gland failure
cerebral edema
shock
death
What is encephalitis?
inflammation of the brain and spinal cord, usually from infection
VIRAL OR BACTERIAL
Encephalitis: Infection triggers inflammation which causes?
vasodilation, increased capillary permeability and leukocyte infiltration
Encephalitis: Primary vs Secondary
P: direct viral infection of the brain and spinal cord
S: travels from elsewhere in the body
What are some complications of encephalitis?
nerve cell degeneration
cerebral edema
cerebral hemorrhage
brain damage
Name 6 manifestations of encephalitis (16 total)
- flulike symptoms
- headache
- neck rigidity
- confusion
- hallucinations
- personality changes
- diplopia and photophobia
- seizures
- muscle weakness
- ataxia
- parasthesia or paralysis
- loss of consciousness
- tremors
- abnormal deep tendon reflexes
- rash
- bulging fontanelles
How can Zika Virus be contracted and spread?
FLAVIVIRUS
mosquitos, foreign travel, sexual transmission, mother to fetus, blood transfusion
CAN CAUSE GUILLAN-BARRE SYNDROME
What causes increased intracranial pressure (ICP)?
INCREASED VOLUME IN CRANIAL CAVITY (CSF, BRAIN TISSUE, BLOOD)
traumatic brain injury
tumor
hydrocephalus
cerebral edema
hemorrhage
ICP: What is the Monro-Kellie hypothesis?
increase in volume of one component must be compensated for by a decrease in volume of another; accompanied most by shifts in CSF AND BLOOD VOLUME
ICP: Autoregulation compensatory mechanism
the blood vessels dilate to increase blood flow and constrict IF ICP INCREASES
ICP: Cushing’s reflex compensatory mechanism
the hypothalamus increases sympathetic stimulation when the mean arterial pressure drops BELOW ICP
CUSHINGS TRIAD
What is Cushing’s triad?
increased BP, bradycardia, and cheyne-stokes respirations
What is herniation?
displacement of brain tissue; feared complication of ICP
Name 5 common manifestations for ICP
- decreasing LOC
- vomiting (projectile)
- Cushing’s triad
- fixed and dilated pupils
- posturing
What is a specific manifestation for infants for ICP?
separated sutures and bulging fontanelle
What are specific manifestations for older children and adults in ICP?
behavior changes, severe headaches, lethargy, neurological deficits, seizures
What is hematoma?
a collection of blood in the tissue that develops from ruptured blood vessels
can develop immediately or slowly (traumatic brain injury or surgery)
What is an epidural hematoma?
bleeding between the dura and skull, usually caused by an arterial tear
What are some common manifestations for epidural hematomas?
marked neurological dysfunction within few hours of injury
brief loss of consciousness, followed by short period of alertness, than another loss of consciousness
What is a subdural hematoma?
develop between the dura and arachnoid by a small VENOUS tear; develops slowly but progresses rapidly
ICP INCREASES OVER A WEEK OF INJURY
What are the differences in a chronic subdural hematoma?
manifestations develop several weeks after injury instead of 24 hours due to slow leak
MORE COMMON IN ELDERLY DUE TO BRAIN ATROPHY
What is an intracerebral hematoma?
bleeding within the brain tissues
What are some causes of intracerebral hematoma?
contusion or shearing injuries
hypertension
CVA (stroke)
aneurysms or vascular abnormalities
What is a subarachnoid hemorrhage?
bleeding in the space between the arachnoid and pia
What is the primary clinical presentation in a subarachnoid hemorrhage?
severe headache with a sudden onset that is worse near the back of the head
What are some complications of hematoma?
INCREASED ICP DUE TO BLEEDING
BLOOD MAY COAGULATE AND FORM SOLID MASS
HEMATOMA BECOMES ENCAPSULATED BY FIBROBLASTS AND BLOOD CELLS WITHIN CAPSULE LYSE
FLUID FROM HEMOLYSIS EXERTS OSMOTIC PRESSURE DRAWING MORE FLUID INTO CAPSULE
EDEMA INCREASES MASS SIZE, INCREASING ICP
VASOSPASMS FROM BLEEDING, WORSEN ISCHEMIA
HERNIATION
What is a spinal cord injury?
result from direct injury to spinal cord or indirectly from damage to surrounding bones, tissues or vessels
What are some causes of spinal cord injuries?
motor vehicle accidents
falls
violence
sports injuries
weakening vertebral structures (rheumatoid arthritis and osteoporosis)
What can occur inside/outside the spinal cord in a spinal cord injury?
hemorrhage, fluid accumulation and edema
COMPRESSES SPINAL CORD AND COULD DAMAGE IT (SECONDARY INJURY)
What is spinal shock?
temporary suspension of neurological function because of spinal cord compression; neurological function gradually returns
What demographic is more likely to get spinal cord injury?
caucasians and males, 43 years (used to be 29)
What are some complications regarding spinal cord injuries?
loss of neurologic functioning
varying degrees of paralysis
cauda equina syndrome
autonomic hyperreflexia
neurogenic shock
respiratory failure
effects of immobility
changes in bowel and bladder function
sexual dysfunction
chronic pain
death