NeuroCerebral

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levzahav9
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185903
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NeuroCerebral
Updated:
2012-11-29 16:21:17
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pathophysiology neuro
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Cards for Chapters 22-23 Patho
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  1. what are focal effects?
    • Focal= Local
    • signs related to the specific area of the brain or SC in which the lesion is located.
    • Examples: paralysis of the right arm resulting from damagge to a section of the left frontal lobe
  2. ___ lesions occur in the cerebral hemispheres above the tentorium cerebelli.
    Supratentorial
  3. A lesion in this location leads to a specific dysfunction in a discrete area, perhaps numbness in a hand.
    cerebral hemispheres above the tentorium cerebelli
  4. a ___ lesion must become very large before it affects consciousness.
    supratentorial
  5. An ___ lesion is located in the brain stem, or below the tentorium.
    infratentorial
  6. a relatively small lesion in this location may affect many motor and sensory fibers, resulting in widespread impairment, because nerves are bundled together when passing through the brain stem.
    infratentorial lesion
  7. Respiratory and circulatory function and the LOC may be impaired by a small lesion in this area
    infratentorial
  8. RAS
    reticular activating systemarea of the brain for arousal or awareness
  9. one of the early changes noted in those with acute brain disorders is a decreasing ___ or responsiveness
    LOC
  10. a small lesion of this kind can affect the RAS
    infratentorial lesion
  11. causes for decrease in LOC
    • extensive supratentorial lesions
    • small supratentorial lesions
    • space-occupying masses in the cerebellum leading to compressions of the brain stem and RAS
    • systemic disorders such as acidosis or hypoglycemia can depress the CNS
  12. levels of reduced LOC
    • lethargy
    • confusion
    • disorientation
    • memory loss
    • unresponsiveness to verabl stimuli
    • difficulty in arousal
    • loss of consciousness or coma: some reflexes present
  13. terminal stage of reduced LOC
    deep coma
  14. markers of deep coma
    • loss of all reflexes
    • fixed dilated pupils
    • slow and irregular pulse and respirations
  15. A ___ is a loss of awareness and mental capabilities, resulting from diffuse brain damage.
    vegetative state
  16. loss of awareness and mental capabilities where the brain stem function continues, supporting respiratory, cardiovascular, and autonomic functions
    vegetative state
  17. Locked-in syndrome
    • refers to a conditions in which an individual with brain damage is aware and capable of thinking but is paralyzed and cannot communicate.
    • some can move their eyes in yes/no response
  18. this diagnosis is ofeten required to terminate medical intervention, because individuals can be maintained artificially on cardiopulomnary support systems.
    brain death
  19. criteria for brain death
    • cessation of brain function, including function of the cortex and brain stem (flat or inactive EEG)
    • Abscence of brain stem reflexes or responses
    • abscence of spontaneous respirations when ventilator assistance is withdrawn
    • establishment of the certainty of irreversible brain damage by confirmation of the cause of the dysfunction
  20. why is a longer time period and additional testing required before brain death can be confirmed in cases of drug overdose or hypothermia
    these cases can cause loss of brain activity temporarily
  21. Damage to the cranial nerves or their nuclei or to the assigned area of the brain may interfere with vision or other ___
    special senses
  22. special senses
    vision, hearing, taste, and smell
  23. The ___ ___ in the ___ ___ ,which receives and localies basic sensory input from the body, is mappedĀ  to correspond to receptors in the skin and skeletal mm of various body regions
    • somatosensory cortex
    • parietal lobe
  24. ___ or convulsions are caused by spontaneous excessive discharge of neurons in the brain.
    seizures
  25. Because the brain is encased in the rigid non-exapadable skull, any increase in fluid, such as blood or inflammatory exudate, or any additional mass such as a tumor causes an increased ___
    ICP
  26. ___ → less arterial blood can enter high pressure area→ compression of brain tissue→ decrease function of neurons locally and generally→___
    • ICP
    • brain tissue necrosis
  27. how does the body attempt to compensate for ICP
    • shifting more CSF to the spinal cavity
    • increasing venous return from the brain
  28. hypoxia resulting from initial ICP compensation→___→ adds to the fluid volume inside the skull and is also effective for a short time
    arterial vasodilation in the brain through local autoregulatory reflexes
  29. Why is ICP significantly elevated before signs become apparent
    because of the initial compensatory mechanisms
  30. first indication of increased ICP
    decreased LOC or lethargy
  31. lethargy
    decreased responsiveness
  32. Early indications of ICP
    • severe headache: from stretching of the dura and walls of the large BVs
    • vomiting: often projectile vomiting that is not associated with food intake, resulting from pressure stimulating the emetic center in the medulla
    • Papilledema: caused by increased ICP and swelling of optic disc
  33. papilledema
    • swelling of the optic disc (where the optic nerve enters the eyeball);
    • usually associated with an increase in intraocular pressure
    • reflects the effects of increased ICP in the brain
  34. Vital Signs of Increased ICP
    • Increasing BP with increase pulse pressure
    • slow heart rate
  35. rationale for vital signs of increased ICP:
    • Increased BP and Pulse Pressure: Cushing's reflex; response to cerebal ischemia causes sytemic vasoconstriction. More blood to brain to relieve ischemia
    • Slow heart rate: response to increasing BP
  36. The ___ is a nervous system response to increased intracranial pressure. It results in Cushing's triad of widening pulse pressure, irregular breathing, and bradycardia. It is usually seen in the terminal stages of acute head injury and may indicate imminent brain herniation.
    Cushing reflex
  37. Visual signs of increased ICP
    • Papilledema
    • pupil ipsilateral to lesion becomes fixed and dilated, as pressure increases the other pupil becomes fixed and dilated
    • ptosis
  38. Rationale for signs of ICP affecting vision
    • Papilledema: increased pressure of CSF causes swelling around the optic disc
    • Fixed dilated pupils: pressure on the CNIII
  39. CNIII
    cranial nerve III oculomotor
  40. when a mass, such as a blood clot or tumor, becomes large enough, it may displace brain tissue, leading to ___
    herniation
  41. types of herniations
    • transtentorial
    • uncal
    • cerebellar/tonsillar (infratentorial)
  42. in ___ herniation, the cerebral hemispheres, diencephalon, and midbrain are displaced downward.
    The resulting pressure affects the flow of blood and CSF, the RAS, and respiration.
    transtentorial
  43. ___ herniation occurs when the uncus of the temporal lobe is diplaced downward past the tentorium cerebelli, creating pressure on the third cranial never, the posterior cerebral arty, and the RAS.
    uncal
  44. ___ herniation develops when the cerebellar tonsils are pushed downward through the foramen magnum leading to compression of the ___ and ___ ___ and causes ___.
    • cerebellar/tonsillar/infratentorial
    • brain stemĀ 
    • vital centers
    • death
  45. SOL
    space occupying lesion
  46. What are the best examples of SOLs that lead to ICP?
    Brain tumors
  47. T/F
    Benign brain tumors as well as malignant can be ife-threatening, unless they are in an accessible superficial location where they can be removed.
    true
  48. ___ form the largest categories of primary malignant tumors
    gliomas
  49. ___ ___ tumors rarely metastasize outside the CNS, nut multiple tumors may be present within the CNS.
    primary malignant
  50. ___ ___ tumors are quite common, usually metastasizing from breast or lung tumors, and they cause effects similar to those of primary brain tumors.
    secondary brain
  51. tumors of the ___ or ___ ___ cause similar neurologic effects that result from pressure on the brain.
    • meningis (meningioma)
    • pituitary gland (adenoma)
  52. ___ ___ and ___ tumors are common in young children.
    • brain stem
    • cerebellar
  53. SS of brain tumors
    • specific site of tumor determines the focal signs
    • morning headaches that in time increase in severity and frequency
    • vomiting
    • lethargy and irritability
    • personality and behavioral changes
    • seizures

    in brain stem or cerebellar: CNs are affeted leading to unilateral facial paralysis
  54. SS of pituitary adenomas
    • endocrinologic signs
    • headaches and visual signs
    • visual disturbances

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