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Transcript of Copyright © 2015 Cengage Learning ®. Chapter 15 Nervous System Diseases and Disorders.
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Copyright © 2015 Cengage Learning®.
Chapter 15
Nervous System Diseases and Disorders
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Anatomy and Physiology• Nervous system
– Brain, spinal cord, and nerves
– Central nervous system (CNS)• Brain• Spinal cord
– Peripheral nervous system (PNS)• Autonomic nervous system• Cranial and spinal nerves
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Common Signs and Symptoms
• Headache• Nausea and vomiting• Weakness• Mood swings• Fever
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Common Signs and Symptoms
• Symptoms specific to CNS:
– Stiffness in neck, back, or extremities– Inability to move any part of body– Seizures or convulsions– Paralysis– Visual difficulties
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Common Signs and Symptoms
• Symptoms specific to CNS: (continued)
– Inability to speak– Paralysis– Extreme or prolonged drowsiness– Stupor, unconsciousnes – Amnesia or extreme forgetfulness
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Diagnostic Tests
• Cerebrospinal fluid• Measurement of intracranial pressure• X-rays of skull and vertebral column• Myelogram• Angiogram• Electroencephalography (EEG)• CT and MRI
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Infectious Diseases• Encephalitis
– Inflammation of brain tissue caused by bacteria and viruses
– Symptoms:• Headache• Elevated temperature• Stiff neck and back• Lethargy• Mental confusion• Coma
– Treatment:• Treatment is supportive• Antiviral medication may be effective
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Infectious Diseases
• Meningitis– Inflammation of meninges or coverings of brain
and spinal cord
– Causes:• Bacteria• Virus• Fungi• Toxins
– E.g., lead, arsenic
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Infectious Diseases
• Meningitis
– Symptoms:• High fever• Severe headaches• Photophobia• Stiffness and resistance in neck (nuchal rigidity)• Drowsiness, stupor, seizures• Coma
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Infectious Diseases
• Meningitis
– Diagnosis • Lumbar puncture to find causative agent
– Treatment• Antibiotics for bacterial infection• Antipyretics• Anticonvulsants• Quiet, dark environment
–
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Infectious Diseases
• Poliomyelitis
– Viral infection affecting brain and spinal cord
– Cause:• Virus spread by oropharyngeal secretions and
infected feces
– Almost eliminated by vaccine in United States
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Infectious Diseases
• Poliomyelitis– Symptoms:
• Muscle weakness• Neck stiffness• Nausea and vomiting• Muscles atrophy and become paralyzed
– Diagnosis • Virus culture from throat, feces, and/or spinal fluid
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Infectious Diseases
• Poliomyelitis– Supportive treatment:
• Analgesics
• Bedrest during acute phase
• Long-term physical therapy and braces may be needed
• If respiratory system involved, mechanical ventilation may be needed
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Infectious Diseases
• Tetanus
– Highly fatal infection of nerve tissue
– Cause• Bacteria Clostridium tetani
– First symptom:• Jaw stiffness • Commonly called lockjaw
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Infectious Diseases
• Rabies– An often fatal encephalomyelitis
– Caused by virus
– Primarily affects animals• E.g., dogs, cats, raccoons, squirrels
– Transmitted to humans through bite of infected animal
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Infectious Diseases
• Rabies– Symptoms:
• Fever• Pain• Paralysis• Convulsions• Rage• Spasms and paralysis of muscles for swallowing• Throat spasms leading to hydrophobia
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Infectious Diseases
• Rabies– Symptoms:
• Inability to swallow• Drooling of frothy saliva
– Treatment:• Immediate washing of area with soap and water• Anti-rabies injections
– No cure
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Infectious Diseases• Shingles
– Viral disease caused by herpes zoster (chicken pox virus)
– Symptoms• Itchy, painful, red rash and small vesicles on sensory
nerve paths• Symptoms last 10 days to several weeks
– Diagnosis• Made based on the appearance of lesions• Viral culture test
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Shingles
Photo courtesy Robert A. Silverman, MD, Pediatric Dermatology, Georgetown University
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Infectious Diseases
• Shingles– Treatment:
• There is no cure• Treatment is symptomatic• Antivirals• Analgesics• Antipyretics• Antipruritics
– Vaccine recommended by CDC for adults over age 60
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Vascular Disorders
• Cerebrovascular accident (CVA)– Also known as stroke– Is due to a poor blood supply to the brain
– Causes• Cerebral thrombus• Cerebral embolism• Cerebral hemorrhage
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Vascular Disorders
• CVA– Symptoms: numerous symptoms depending on
the area of the brain affected and the severity of the CVA
• Sudden loss of consciousness• Confusion• Poor coordination• Dysphasia• Dysphagia• Hemiparesis
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Vascular Disorders
• CVA– Diagnosis
• Physical exam, EEG, CT scan, and MRI
– Treatment:• Anticoagulant• Hypertensive medications• Rehabilitation program
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Vascular Disorders
• CVA– Risk factors:
• Smoking• High-fat diet• Obesity• Lack of exercise
– Surgical prevention treatment:• Carotid endarterectomy
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Vascular Disorders
• Transient ischemic attacks (TIAs)– Also known as mini-strokes
– Due to insufficient blood supply to brain
– Symptoms:• Weakness of arm and/or leg• Dizziness• Slurred speech• Mild loss of consciousness
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Vascular Disorders
• TIAs– Symptoms last few minutes to 1 hour
– Diagnosis by angiogram
– Treatment:• Surgery to improve blood flow
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Functional Disorders• Degenerative disk disease• Headaches• Epilepsy• Bell’s palsy• Parkinson’s disease
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Functional Disorders
• Degenerative disk disease– Degeneration or wearing away of intervertebral
disk• Allows vertebrae to bump or rub against each other
– Symptoms:• Difficulty walking• Radiating pain in back and in one or both legs
– Diagnosis by X-ray, myelogram, CT scan, and MRI
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Functional Disorders
• Degenerative disk disease
– Treatment:• Rest back and legs• Back brace• Analgesics• Anti-inflammatories• Exercise to ease pain• Surgery
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Functional Disorders• Headaches
– One of the most common disorders in humans
– Usually a symptom of another disease rather than a disorder in and of itself
– Disorders that typically have headaches as a symptom include:
• Sinusitis Meningitis• Encephalitis Hypertension• Anemia Constipation• Premenstrual tensionTumors
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Functional Disorders• Headaches
– Caused by two mechanisms:• Tension on facial, neck, and scalp muscles• Vascular changes in arterial size of vessels inside
head
– Contributing factors:• Stress• Toxic fumes• Noise• Lack of sleep• Alcohol consumption
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Functional Disorders• Headaches
– Headaches may be acute or chronic– Pain may be mild to unbearable and
incapacitating– Pain may be constant, pressure, throbbing,
stabbing, or intermittent
– Types:• Tension• Cluster• Following lumbar puncture• Migraine
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Functional Disorders• Headaches
– Diagnosis:• History and physical, X-ray, EEG, MRI, and CT
– Treatment:• Lifestyle changes – improved diet, sleep, exercise• Analgesics• Bedrest• Muscle massage• Muscle relaxants• Warm baths• Biofeedback
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Functional Disorders• Epilepsy
– Chronic disease of brain
– Intermittent episodes of abnormal electrical activity in brain
– Symptoms:• Seizure• Convulsions
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Functional Disorders• Epilepsy
– Common types of seizures– Petit mal– Grand mal– Status epilepticus
– Diagnosis by EEG, CT scan, cerebral angiogram, and blood tests
– Treatment:• Anticonvulsive medications• Close monitoring and adjusting of medication
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Functional Disorders
• Bell’s palsy– Affects facial nerve (7th cranial) leading to
unilateral (one-sided) paralysis
– Affects individuals 20 to 60 years of age
– Symptoms:• Drooping weakness of eye and mouth• Inability to close the affected eye• Drooling of saliva
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Functional Disorders
• Bell’s palsy– Symptoms: (continued)
• Unable to whistle or smile• Distorted facial appearance
– Diagnosis by history and symptoms
– Treatment:• Analgesics• Anti-inflammatories
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Functional Disorders• Parkinson’s disease
– Slow, progressive brain degeneration
– Cause is unknown, but may be related to a decrease of brain neurotransmitter – dopamine
– Symptoms:• Rigidity and immobility of hand• Very slow speech pattern• Pill-rolling motion of fingers• Expressionless facial appearance
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Functional Disorders
• Parkinson’s disease– Symptoms: (continued)
• Abnormal bent-forward posture• Short, fast-running steps with shuffling appearance
– Symptomatic treatment:• Dopamine replacement• Physical and psychological therapy
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Dementias• Loss of mental ability due to loss of
neurons or brain cells• Types of dementia
– Senile (old age)• Alzheimer’s disease – the most common type of
senile dementia• Senile and Alzheimer’s disease are often used
synonymously, but they are not the same.
– Vascular– Head trauma– Substance induced
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Dementias
• Alzheimer’s disease– A form of senile dementia
– Usually affects individuals age 70 and older
– Early symptoms:• Short-term memory loss• Inability to concentrate• Slight changes in personality
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Dementias
• Alzheimer’s disease
– Symptoms of disease progression:• Diminished communication skills• Meaningless words• Inability to form sentences• Increased forgetfulness• Irritability and agitation
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Dementias
• Alzheimer’s disease– Diagnosis
• Positive only by autopsy• Initially, diagnosis may be made by ruling out other
brain diseases
– Treatment• Supportive, no known cure• Focused on safety, maintaining nutrition, hydration,
personal hygiene• Emotional support for family and caregivers
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Dementias
• Vascular dementia
– Atrophy and death of brain cells due to decreased blood flow
– Atherosclerotic plaque can cause decreased blood flow
• Common with aging
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Dementias
• Vascular dementia
– Symptoms:• Changes in memory, personality, and judgment• Irritability• Depression• Sleeplessness• Lack of personal hygiene
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Dementias
• Vascular dementia
– Diagnosis: • History and physical, blood flow testing
– Treatment:• Increasing blood flow to brain• Carotid endarterectomy
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Dementias
• Head trauma dementia
– Death of brain cells due to head trauma
– Symptoms:• Decrease in mental intellect and cognitive function• Loss of ability to reason, remember, or show
appropriate emotions• Changes in personality
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Dementias
• Head trauma dementia– Diagnosis:
• History, cranial X-rays, CT scan, and MRI
– Treatment:• Correct damage, if possible• Therapy and rehabilitation
– Prevention:• Is often easy to prevent with proper use of protective
equipment
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Dementias• Substance-induced dementia
– Brain cell death from drug toxicity and toxins
– Toxic substances include:• Alcohol Cocaine• Heroine Lead• Mercury Paint fumes and thinner• Insecticides
– Symptoms:• Mental impairment • Decreased cognitive ability
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Sleep Disorders• Insomnia
– The most common form of sleep disorder
– Inability to fall or stay asleep
– Cause:• Stress, pain, fear, depression, caffeine, alcohol,
nicotine, and bronchodilators
– Treatment:• Identifying and removing cause
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Sleep Disorders• Sleep apnea
– Characterized by periods of breathlessness
– Cause:• More common in men• Obesity• Hypertension• Airway obstruction• Alcohol ingestion• Cigarette smoking
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Sleep Disorders• Sleep apnea
– Symptoms:• Daytime sleepiness• Extreme snoring• Changes in personality• Depression• Impotence
– Diagnosis:• Monitoring affected individual during sleep for apnea
and low blood oxygen levels
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Sleep Disorders• Sleep apnea
– Treatment:• Based on cause• Weight loss• Surgery to correct nasal obstruction• Oxygen during sleep• Medications to stimulate breathing
– Prevention:• Most cases can be prevented by maintaining a
healthy weight, avoiding alcohol, not smoking, and avoiding environmental smoke
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Tumors• Brain tumor
– Classified as primary and secondary– Primary tumors are called brain tumors– Secondary tumors are named after the organ
of origin– Cause:
• Unknown
– Symptoms:• Headache• Vomiting• Seizures• Changes in mood and personality• Visual disturbance• Loss of memory
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Tumors
– Diagnosis:• Clinical symptoms• X-ray • CT scan • MRI• Biopsy
– Treatment:• Surgery• Radiation• Chemotherapy
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Trauma• Concussions and contusions
– Concussion less serious than contusion– Contusion is a physical bruising of the brain
tissue– Cause
• Blow to head by object, fall, or other trauma– E.g., automobile accident
– Symptoms:• Disruption of normal electrical activity in brain –
unconsciousness• Unconsciousness may last a few seconds to several
hours• Headache• Blurred vision
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Trauma
• Concussions and contusions– Symptoms: (continued)
• Irritability• Draw up knees and begin vomiting
– Contusions can lead to:• Hematoma• Increased intracranial pressure (ICP)• Permanent brain damage
– Coup and contrecoup contusions
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Coup and Contrecoup
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Trauma• Concussions and contusions
– Diagnosis:• History of injury, neurologic examination, cranial X-ray, CT
scan, and MRI
– Treatment:• Bedrest• Direct observation
– Individual should be checked every 2 to 4 hours
• Monitoring of changes in consciousness, eye pupil size, mood, and behavior
• Analgesics, stimulants, and sedatives should not be given• Medications may mask symptoms and make assessment
difficult
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Trauma
• Skull fracture– A break in a cranial (skull bone)
– Greatest danger: • Brain tissue damage from bony fragments• Potential of cutting brain, severing vessels, causing
hematoma
– Brain damage may be temporary or permanent
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Trauma
• Skull fracture– Symptoms:
• Variety of symptoms depending on location of fracture• Fracture near base of skull may cause impaired
breathing• Hemiparesis• Seizures• Infection
– Treatment:• Dependent on type and position of fracture• Craniotomy may be necessary to relieve ICP• Protective headgear may be necessary until fracture
healed
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Trauma
• Epidural and subdural hematomas
– Epidural hematoma is a collection of blood between the bony skull and dura mater (outer meninges)
– Subdural hematoma is a collection of blood between the dura mater (outer layer) and the arachnoid (middle layer)
– Subdural hematoma occurs twice as often as epidural
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Trauma
• Epidural hematoma– Cause:
• Usually the result of a fight or accident• Blood vessels rupture and hemorrhage or seep blood
usually rapidly over a period of hours
– Symptoms:• Usually occur within a few hours• Headache• Dilated pupils• Nausea• Vomiting
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Trauma
• Epidural hematoma– Symptoms: (continued)
• Dizziness• As the hematoma grows:
– Loss of consciousness– Increase in ICP
• Subdural hematoma– Cause:
• Usually result of head hitting stationary object– As is seen with falls when the head hits the floor
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Trauma
• Subdural hematoma– Cause: (continued)
• Blood vessels rupture and seep blood slowly, usually over a period of days
– Symptoms:• Hemiparesis• Nausea and vomiting• Dizziness• Convulsions• Loss of consciousness
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Trauma
• Epidural and subdural hematoma– Diagnosis:
• Cerebral hematoma is made by– Clinical history– Cranial X-ray– CT or MRI
– Treatment:• Goal is to decrease ICP• Pressure can be relieved by
– Special craniotomy called burr holes– Electrical cauterization
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Trauma• Spinal cord injury
– Usually results when bony spinal column is injured or fractured
– The cord can be injured at any level• Neck area is most vulnerable
– Cause:• Automobile accidents – leading cause• Gunshot and knife wounds• Falls and sports injuries
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Trauma• Spinal cord injury
– Symptoms:• Varying degrees of injury
• Injury to C1-C3 is usually fatal
• Quadriplegia– Loss of movement and feeling in trunk and all four
extremities– Loss of bowel, bladder, and sexual function– If severe, respiratory ventilation
• Paraplegia– Loss of movement and feeling in trunk and both legs– Loss of bowel, bladder, and sexual function
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Trauma• Spinal cord injury
– Diagnosis:• History of injury, neurologic exam, spinal X-rays, CT
scan, and MRI
– Emergency treatment:• Immediate treatment necessary• Do not move individual unless surroundings unsafe• Maintain position of spine with special collars and
backboards
– Treatment:• Realignment and stabilization of bony spinal column• Decompression or release of pressure on spinal cord• Prevent further injury
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Rare Diseases• Amyotrophic lateral sclerosis (ALS)
– Also known as Lou Gehrig’s disease
– Destructive disease of motor or movement neurons
– Atrophy of muscles leading to progressive loss of movement of hands, arms, and legs
– Supportive treatment
– No cure
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Rare Diseases
• Guillain-Barré syndrome– Acute, progressive disease affecting spinal
nerves
– Begins 10 to 21 days after febrile illness
– Early symptoms:• Nausea• Fever• Malaise
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Rare Diseases• Guillain-Barré syndrome
– Within 24 to 72 hours, paresthesia, muscle weakness, and paralysis usually begin
– Symptoms may progress for several days to weeks
– Once progression ceases, recovery begins
– Supportive treatment
– Recovery usually complete
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Rare Diseases
• Huntington’s chorea
– Inherited disease
– Appears during middle age
– Progressive degenerative disease of brain
– Leads to mental deterioration
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Rare Diseases
• Huntington’s chorea– Symptoms:
• Loss of muscle control and chorea• Changes in personality mood, and behavior• Loss of memory and dementia
– Supportive treatment
– No cure
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Rare Diseases• Multiple sclerosis (MS)
– Causes:• Demyelination of CNS nerves• Allows information to leak from nerve pathway• Leads to poor or absent nerve transmission
– Symptoms:• Muscle weakness and lack of coordination• Paresthesia• Speech difficulty• Loss of bladder function• Visual disturbance, especially diplopia
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Rare Diseases
• Multiple sclerosis– Affects adults between ages 20 and 40
– Periods of remission and exacerbation
– Treatment:• Physical therapy• Muscle relaxants to maintain muscle tone and reduce
spastic movement
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Effects of Aging• Decreased nervous system activity in
brain and spinal cord
• Loss of short-term memory
• Loss of visual acuity and peripheral vision
• Altered sleep patterns