Exam 2 Flashcards
Three consequences of impaired intracranial regulation
Cerebral edema- increased brain size, fluid accumulation
Increased intracranial pressure- sustained pressures, trauma,
Decreased cerebral perfusion pressure (bleeding r/t hemorrhagic stroke)
Cushing Triad for increased ICP
Increased systolic blood pressure (widened pulse pressure)
Decreased pulse rate (bradycardia)
Decreased respirations (irregular)
Note: effects opposite those of shock
ICP Monitoring
Indications (4)
Care (2)
Indications
- Glasgow Coma Scale score < 8
- TBI w/ abnormal CT scan
- Deteriorating neurological condition
- Subjective judgment regarding clinical appearance and response
Care
- Do not change dressings daily
- keep drainage bag for direct ventricular pressure measurement at level of ventricles
Pediatric Glasgow Coma Scale
Three parts (and their scales)
Three parts
- Eye opening (1-4 – none; pain; speech; spontaneously)
- Motor response (1-6 – none; extension; flexion abnormal; flexion withdrawal; localizes pain; obeys commands)
- verbal response (1-5 – incomprehensible/agitated/restless; inappropriate persistent cry or words; confused/consolable cry; orientation (smiles, listens, follows)
Pediatric Glascow Coma Scale
3 score ranges
Score of 15: unaltered LOC
Score of 8 or below: coma
Score of 3: extremely decreased LOC
(worst possible score on the scale)
Head Injury
Patho (2)
- acceleration-deceleration esp due to large head to body ratio in child
- force of intracranial contents unable to be absorbed by skull so shearing forces OR force brain through tentorial opening
Types of Head Injuries (6)
- Skull fracture (requires great force)
- Contusions: visible bruising coup (at impact pt) OR contrecoup (opposite impact pt)– shaken baby syndrome
- Intracranial hematoma
- Diffuse injury
- Laceration (tearing of tissue)
- Concussion (alteration in neurologic function w/ or w/o loss of consciousness; may have amnesia/confusion but transient)
Complications of Head Trauma (3)
Epidural hemorrhage (death likely)
- Bleeding b/w skull and dura lead to tentorial herniation rapidly
Subdural hemorrhage
- Bleeding b/w dura and arachnoid membrane over brain due to vein tearing or direct trauma
- slow development
Cerebral edema
- Associated with TBI
- Increased cytotoxic or vasogenic edema leads to herniation
Types of Skull fractures (6)
Basilar: post- Battle sign (bleeding posterior neck, mastoid area), raccoon eyes, leakage of CSF from ears and nose
Diastatic: transverses the sutures and widens sutures.
Comminuted: split into multiple pieces
Linear: does not cross suture lines
Open: leads to rhinorrhea or otorrhea of CSF
Depressed: locally broken into irregular fractures
Diagnostics for Intracranial Regulation (6)
- Neuroimaging (MRI, CT) (Check for allergies if contrast dye to be used; child must be still)
- Skull radiograph
- EEG (flat = brain death)
- Brain biopsy
- Lumbar puncture (contraindicated w/ increased ICP; lie still)– diagnostic for meningitis
- Lab tests (hyperglycemia in increased ICP; low HCt, low Platelet, high WBC in head injury)
Neurological Examination: impaired?
Vital signs (3)
- cerebral hypoxia > 4 min = irreversible damage
- hypothermia = severe infection
- hyperthermia = acute infections, heatstroke, drug ingestion, hemorrhage
Neurological Examination: Impaired?
Respiratory (4)
- Slow and deep = heavy sleep after seizures, sedatives, cerebral infections
- Slow and shallow = sedatives or opioids
- Hyperventilation = metabolic acidosis, salicylate poisoning, hepatic coma
- Hypoventilation/ CO2 retention = can increase cerebral blood flow and ICP
Neurological Examination: Impaired?
LOC (2)
Skin (2)
LOC
- unable to say their name
- have parent in room to increase chance of response
Skin
- bruises, bleedings, or needle sticks
- head circumference reading till 2 yrs (daily if myelomeningocele, hemorrhage or IU infections)
Neurological Examination: Impaired?
Eyes (3)
- not PERRLA (fixation = brain damage, dilation or pinpoint = brain damage, dilation but reactive = seizure)
- doll head maneuver (rotate head, eyes should go to opposite side)
- Ice water caloric test ( only if unconscious; eyes move to side of stimulation)
S/s of Increased ICP in Infant (7)
Poor feeding
High-pitched cry, difficult to soothe, irritable
Tense, bulging fontanels
Separated cranial sutures (increased frontooccipital circumference)
Distended Scalp veins
Macewen (cracked-pot) sign (Bones of skull thin and sutures palpably separated to produce cracked-pot sound on percussion of skull
Setting-sun sign (Sclera visible above iris due to eyes being rotated downward)
S/s of Increased ICP in Child (8)
- Headache
- Forceful NV
- Seizures
- Irritability
- Diminished physical activity (drowsy, lethargy, Inability to follow simple command)
- Slurred speech
- Visual changes (diplopia, blurred vision)
- Inappropriate for age reflexes i.e. primitive and babinski)
Late signs of Increased ICP (9)
Bradycardia
Decreased motor response to a command
Decreased sensory response to painful stimuli
Alterations in pupil size and reactivity
Decortication (Rigid flexion w/ arms close to body, flexed elbows and wrists, plantar flexed feet, legs extended & internally rotated)
Decerebrate (rigid extension and pronation of arms and legs, flexed wrists, clenched jaw, extended neck; arched back)
Cushing’s triad-decreased HR. RR. & widening or increased BP (pulse pressure)
Cheyne-Stokes respirations (prolonged apnea, paradoxical chest movement, ataxic breathing, hyperventilation)
Papilledema (optic disc swelling, hemorrhages, tortuosity of vessels, absence of venous pulsations)- develops in 24-48 hrs
8 levels of consciousness
Full consciousness
Confusion: impaired decision making
Disorientation: to time and place
Lethargy: sluggish speech
Obtundation: arouses with stimulation; respond to voice or pain
Stupor: responds only to vigorous and repeated stimulation
Coma: no motor or verbal response to noxious stimuli i.e voice nor pain
Persistent vegetative state: permanent loss of function of cerebral cortex
Stages of Brain Herniation (5)
bilateral Babinski reflexes
Grasp reflex
Decortication (Rigid flexion w/ arms close to body, flexed elbows and wrists, plantar flexed feet, legs extended & internally rotated)
Decerebrate (rigid extension and pronation of arms and legs, flexed wrists, clenched jaw, extended neck; arched back)
Flaccid (when lower pons and upper medulla involveD)
Nursing Care of Unconscious child: Reduce ICP (9)
- ABC (vitals q15 mins)
- NPO
- neck stabilization(use jaw thrust vs chin lift for airways)
- minimize environmental noise, stimulation
- reduce suctioning
- position (HOB 30 degrees and avoid neck vein compression)
- Prevent straining i.e. cough, vomit, defecation, Valsalva maneuver
- Use vibration instead of cough b-c it does not increase ICP
- provide thermoregulation (light covering, antipyretics, hypothermia blanket)
Medications to reduce ICP (6)
- Stool softeners
- Analgesics (pain increases ICP but pain meds decrease LOC so controversial; acetaminophen, NSAIDs, opioids, paralytics (vecuronium)))
- IV hypertonic NS (no dextrose if on keto; avoid overhydration)
- manage SIADH (NS and diuretics) or DI (vasopressor or fluid replacement) if present
- corticosteroids (for inflammation and edema)- watch for hyperglycemia, infection; don’t give if for head trauma
- osmotic diuretic (Mannitol) - reduce ICP
Acute Care Medications to reduce ICP
4 types
Antiepileptics –phenytoin, fosphenytoin, Carbamazepine (Tegretol)
- Look for CBC changes and SJS
- used for seizures
Sedation or amnesic anxiolytics (Propofol, Lorazepam) - agitation can increase ICP
Barbiturates (controversial)- induce coma to decrease metabolic rate and protect brain when reduced cerebral perfusion pressure
Paralytic agents
Posttraumatic Syndromes: Head Injury (4)
- Post-concussion syndrome: residual symptoms after 4 weeks
- Headaches – within 1 week – 3months
- Seizures – within 24 hrs
- Structural complications i.e hydrocephalus, herniation
Hydrocephalus
Patho (3)
- Impaired absorption, production, or flow of CSF within the subarachnoid space
- Communicating or non-communicating (obstructive)
- Increased CSF in ventricles leads to dilated ventricles and compresses brain tissue