Neurology Flashcards Preview

Primary Care 2 > Neurology > Flashcards

Flashcards in Neurology Deck (108):
1

Vertigo diagnosis

most important is the history. "When you have dizzy spells, do you feel light headed or do you see the world spin around you?" True vertigo is the room spinning. Also need: neuro exam, head and neck exam, cardiac exam

2

Chronic dizziness is associated with these conditions

Falls, functional disability, orthostatic hypotension, syncope, strokes, fear of falling, depression, decreased social activities

3

What you need to dx neuro disorders

good hx, focal exam, a good differential dx to present to neurologists

4

Dizziness, acute v chronic

Dizziness is a term used to describe various abnormal sensations arising from perceptions of the body's relationship to space or unsteadiness. Acute is 2 months.

5

Vertigo definition

Sensation of spinning in which the individual perceives movements of the environment in relation to the body (objective vertigo) or vice verson (subjective vertigo)

6

Dizziness patho

Sensation of postural instability or imbalance, vestibular system maintains spacial orientation at rest and during acceleration. Infection or congestion could alter this.

7

Diseases that could alter vestibular system

*Menieres disease* *Benign Paroxysmal Positional Vertigo* Recurrent Vestibulopathy *Labyrinthitis/Vestibular Neuronitis* Acoustic Neuroma Drug Toxicity Age related changes related to hair cells

8

Disorders of the proprioceptive system

Peripheral neuropathy - b12 deficiency and DM, cervical degenerative disorders. Proprioceptive system consists of mechanoreceptors in the joints, peripheral nerves, and posterior columns and multiple CNS connections. ANY CNS disorder can lead to an imbalance causing dizziness. Bells palsy can have prodromal symptoms of dizziness.

9

Ocular system and dizziness

Vision provides information about spacial orientation. Disorders of the ocular system: cataracts, macular degen, glaucoma, age related changes - decrease in acuity, dark adaption, contrast sensitivity, and accomodation

10

CN 1

Olfactory, smell.

11

CN 2

Optic, vision. Opthalmoscope, visual acuity

12

CN 3

Oculomotor, raise eyebrows, pupil constriction

13

CN 4

Trochlear

14

CN 5

Trigeminal, facial sensation

15

CN 6

Abducens

16

CN 7

Facial, smile, puff cheeks, raise eyebrows

17

CN 8

Acoustic, test hearing, test vertigo

18

CN 9

Glossopharyngeal, palate elevation and gag reflex

19

CN 10

Vagus, test articulation

20

CN 11

Spinal accessory, shrug shoulders,

21

CN 12

Hypoglossal, stick out tongue

22

The most common type of dizziness reported by older people

Mixed dizziness - different circumstances of being dizzy

23

Vertigo results from

disorders of the vestibular system and its connecting pathways

24

Disequilibrium

Feeling of unsteadiness or imbalance primarily involving lower extremities or trunk rather than the head. Patient usually expressese the feeling that he or she is about to fall. Results from disorders of proprioceptive system, musculoskeletal weakness or cerebellar disease

25

Pre-syncope

Results from hypoperfusion of the brain, is a feeling of lightheaddedness or impending faintness or the sensation that one is about to pass out. ***cardiovascular causes including vasovagal disorders are common causes in older persons

26

Multifactoral dizziness

"whirling" "tilting" "floating" and other nonspecific sensations

27

Menieres Disease

(Endolymphatic hydrops) 2-8 percent of older patients with dizziness. Etiology unknown. Pathology: excess endolymph within the cochlea and labyrinth. Involvement of the inner ear, "fullness". Unilateral in majority of patients. May have nausea/vomiting/ha during episodes. Classic triad: episodic vertigo, tinnintus, and fluctuating sensory-neural hearing loss. True vertigo can last from 1-24 hours.

28

Weber Rinne megahertz

512

29

Benign Paroxysmal Positional Vertigo

Etiology unknown in most cases, although some have a history of head injury or viral labyrinthitis. Pathology: Results from freely moving particulate matter within the posterior semicircular canal. This movement causes alteration in the endolymphatic pressure resulting in vertigo and nystagmus

30

BPPV s/s

Vertigo, nystagmus, sudden onset, n/v. Precipitated by changes in the position of the head. Classically accompanied by rotational nystagmus. Dx w Dix-hallpike test

31

Recurrent vestibulopathy

Idiopathic, vertigo lasts from 5minutes until 24 hours. Characterized by recurrent episodes of vertigo without auditory or neurological symptoms or signs. As opposed to Menieres disease, auditory symptoms are absent

32

Acoustic Neuroma

aka Cerebellopontine Angle Tumor. 1-3% of persons with dizziness. A benign tumor of the 8th CN. Clinical features: tinnitus and progressive UNILATERAL sensourineural hearing loss, particularly for the higher frequencies like phone ring or doorbell. Feel unsteady not true vertigo. Large tumors may have occipiral headache, diplopia, paresthesias in trigeminal or facial nerve distribution and or ataxic gait

33

CNS Disorders

cerebrovascular disease ranges from 4-70 percent among older people with dizziness. TIA/Stroke c/o dizziness, diplopia, dysarthria, numbness or weakness. Cerebellar infarct, posterior lateral medullary infarction Wallenberg Syndrome

34

Psych disorders and dizziness

Depressive symptoms are a/w dizziness and vice versa among older persons

35

Cervical disorders and dizziness

Usually present with vague lightheadedness or vertigo a/w turning the head, most common vascular mechanism of cervical dizziness is an obstruction of the vertebral arteries. degenerative changes in the cervical spine may cause dizziness because of impairment of the cervical proprioceptive mechanoreceptors. May present with radicular pain in the neck upon movement as well as dizziness.

36

Systemic causes of dizziness

hypothyroidism, anemia, electrolyte imbalance, HTN, CAD, CHF, DM. These can lead to decreased cerebral perfusion or oxygen delivery leading to a sensation of dizziness

37

Orthostatic hypotension

20/10 drop after standing from supine or sitting.

38

Postural dizziness

dizziness in standing from supine but no drop in pressure

39

Postprandial hypotension

A decrease in systolic blood pressure of 20 or more in sitting or standing within 1-2 hours of eating a meal

40

Meds causing dizziness

Antihypertensives, loop diuretics causing ototoxicity or volume depletion, antiarrhythmics, anticonvulsants, anxiolytics through effect on CNS, tricyclic antidepressents, anithistamines, and cold preparations through anticholinergic properties, antibiotics and nsaids and loops cause through ototoxicity especially with decreased renal function which decreases their clearance

41

Vestibular dizziness

BPPV, Menieres, Vestibular neuritis, labyrinthitis, cholesteatoma, superior semicircular canal dehiscence, perilymphatic fistula

42

Neurologic dizziness

Vestibular migraine, posterior fossa tumor, MS, cerebellar stroke, vertebrobasilar insufficiency, wallenberg syndrome, trauma, paraneoplastic cerebellar degeneration, benign intacranial HTN, mal de debarqument syndrome

43

Cardiovascular dizziness

syncope/presyncope, orthostatic hypotension, autonomic dysregulation

44

Psych dizziness

psychophysiologic dizziness, psychogenic dizziness

45

Metabolic dizziness

DM, hypothyroidism

46

Autoimmune dizziness

RA, SLE, Cogan syndrome, wegener granulomatosis, bahcet disease

47

Iatrogenic dizziness

post surgical

48

Infectious dizziness

Lyme, Syphillis, HIV, CMV, HSV1

49

Sense of rotation or being pushed

Vertigo

50

Relieved by sitting or lying down

Presyncope or impending faint

51

Imbalance

Sensation localized to the body relieved by support

52

Ill-defined lightheadedness

Cerebral sensation of being woozy, visual abnormalities

53

If dizziness cause is uncertain

Provocative testing to stimulate cephalic ischemia by producing orthostatic hypotension, including valsalva, hyperventilation

54

Stimulate vestibular dysfunction by

swiveling then rapidly stopping in a chair to induce vertigo that the pt can compare to their symptomatic dizziness

55

Dizziness/Vertigo tx

Tx underlying cause, educate to reduce anxiety, modify activities that lead to dizziness, avoid harm

56

Pharm tx of dizziness

Vestibular suppressants for acute episodes only. Antihistamines use with caution as they can cause dizziness. Anticholinergics. Benzos for long term treatment

57

Referral for dizziness

Consider referral to cardiology, neurology, endocrinology. PT for vestibular rehab consists of sets of exercises using movements of the eyes, head and body to stimulate the vestibbular system

58

Pharm mgmt of orthostatic hypotension

Caffeine, Fludrocortisone, Midodrine, Desmopressin, Erythropoeiten

59

definition of dementia DSM-5

decline in cognition involving at least one or more cognitive domains:
learning and memory
language
executive function (make decisions, balance checkbook)
complex attention* added in dsm5
perceptual- motor (tripping over everything)
social cognition*added in dsm5
- must represent a significant decline from previous level of functioning
- deficits NOT explained by another mental disorder and no not occur exclusively in the context of delirium

60

number one job pertaining to alzheimer's

early recognition- history taking is key

61

new name for dementia according to DSM5

major neurocognitive disorder

62

criteria for dementia according to DSM 4

A1. Memory
impairment
A2. At least one of the following:
Aphasia
Apraxia
Agnosia
Disturbance
in executive
functioning
B. The cognitive deficits in A1 and A2 each cause
significant impairment in social or occupational
functioning and represent a significant decline
from a previous level of
functioning
C. The cognitive deficits do not occur exclusively
during the course of delirium

63

criteria for DSM 5

A. Evidence of significant cognitive decline
from a previous level of performance in one or
more cognitive domains:
Learning
and memory
Language
Executive
function
Complex attention*
Perceptual- motor
Social cognition*
B. The cognitive deficits interfere with
independence in everyday activities. At a
minimum, assistance should be required with
complex instrumental activities of daily living,
such as paying bills or managing medications.
C. The cognitive deficits do not occur
exclusively in the context of a
delirium
D. The cognitive deficits are not better
explained by another mental disorder (eg,
major depressive disorder, schizophrenia)

64

biggest problem with dementia

insidious nature of the problem, years typically pass before informants come forward (rarely self reported)

65

mild cognitive impairement (MCI)

generally defined by the presence of memory difficulty
and objective memory impairment but preserved ability to function in daily life.

66

cause/ differentials for: Gradual onset of short- term memory loss and functional impairment in more than one domain:
I. Executive function (finances,
shopping, cooking, laundry, transportation)
II. Basic activities of daily living (feeding, dressing,
bathing, toileting, transfers)

cause- dementia
differentials: Alzheimer disease, Parkinson
dementia, Lewy body dementia,
Pick's disease, alcohol-related dementia, Creutzfeld-Jacobs disease

67

cause/ differentials for: Stepwise, sudden deterioration in
cognition; episodes of confusion, aphasia, slurred speech, focal weakness

cause- Cerebrovascular disease
differentials- Vascular dementia, multi-infarct
dementia, Binswanger's dementia (subcortical dementia)

68

cause for: Acute cognitive impairment
with clouded sensorium; difficulty with attention; may have
hypersomnolence

cause- delirium

69

Complains of memory loss, decreased concentration, impaired judgment, feels worse in morning
and hopeless

cause- depression
differentials- Minor depression, dysthymic disorder, major depression, pathologic grief reaction

70

examination for dementia patient should include

cognitive, mini mental exam, clinical dementia rating, mini cog, neuropsychological testing, premorbid ability (SEE up to date "Eval of cognitive impairment and dementia" these are explained- one will be on exam)

71

clinical dementia rating (CDR)

(0, 0.5, 1, 2, 3)
Score only as decline from previous usual level due to cognitive loss, not impaired due to other factors
•increasingly used in clinical decision making as well, such as driving
•In a semi- structured interview with the patient and caregiver

http://www.biostat.wustl.edu/~adrc/cdrpgm/ind
ex.html (BECOME FAMILIAR WITH THIS)

72

delirium

Acute confusional state characterized by an alteration of consciousness with reduced ability to focus, sustain, or shift
attention

73

dx of delirium

**multi- layered- 5 key features (need all of them**)
1. abrupt disturbances
2. disturbances in attention
3. disturbance in cognition
4. no other explanation of the disturbance
5. disturbance is caused by a medical condition, substance
intoxication or withdrawal, or medication side effect

74

management of delirium

Avoiding factors known to cause or aggravate delirium, such as multiple medications, dehydration, immobilization, sensory impairment, and sleep disturbance
1. identifying and treating underlying problem
2. providing supportive/ restorative care to prevent further physical and cognitive decline
3. Where appropriate, controlling dangerous and severely
disruptive behaviors using low dose, short acting pharmacologic agents

75

syncope

is a symptom defined as a transient,
self- limited loss of consciousness, usually leading to falling.

76

Regardless of the etiology, the underlying mechanism
responsible for syncope is ?

a drop in cerebral oxygen delivery below the threshold for consciousness also known as transient cerebral hypoperfusion

77

pathophys behind syncope- The “blunted baroreflex sensitivity” with aging is
manifested as

a reduction in the heart rate response to hypotensive stimuli

78

pathophys behind syncope- Older adults are prone to reduced blood volume:

a decline in plasma renin and aldosterone, which
causes excessive salt wasting by the kidney, a rise
in atrial natriuretic peptide, and concurrent diuretic therapy

79

orthostatic hypotension

Is arbitrarily defined as either a 20 mmHg fall in systolic blood pressure or a 10 mmHg fall in diastolic blood pressure on assuming an upright posture from a supine
position

80

possible causes of orthostatic hypotension

Aging, HTN, medications, myocarditis, atrial myxoma, aortic stenosis, constrictive pericarditis, hemorrhage, diarrhea, vomiting, ileostomy, burns, hemodialysis, salt losing nephropathy, diabetes insipidus, adrenal insufficiency, fever, extensive varicose veins, primary autonomic failure syndromes, secondary autonomic dysfunction and volume depletion

81

orthostatic hypotension- Precipitating factors

speed of positional change, prolonged recumbency, warm
environment, raised intrathoracic pressure (coughing, defecation, micturition), physical exertion, and vasoactive drugs.

82

Carotid Sinus Syndrome & Carotid Sinus Hypersensitivity pathophys

–Characterized by episodic bradycardia and/or
hypotension resulting from exaggerated baroreceptor
mediated reflexes or carotid sinus hypersensitivity
–Is diagnosed in persons with otherwise unexplained
recurrent syncope who have carotid sinus
hypersensitivity
–Is considered present if carotid sinus massage
produces asystole exceeding 3 seconds
(cardioinhibitory), or a fall in systolic blood pressure
exceeding 50 mmHg in the absence of cardioinhibition (vasodepressor), or a combination of the two (mixed).

83

Carotid Sinus Syndrome: Presentation

The syncopal symptoms are usually precipitated by mechanical stimulation of the carotid sinus such as head turning, tight neckwear, neck pathology, and by vagal stimuli such as prolonged standing. In a significant number of patients no triggering event can be identified

84

carotid sinus syndrome- possible triggers

postprandial state, straining, looking or stretching
upward, exertion, defecation, and micturition

85

normal response to orthostasis

an ↑ in heart rate, rise in peripheral vascular resistance (↑ in diastolic blood pressure), and minimal ↓ in systolic blood pressure, to maintain an adequate cardiac output

86

pathophys of vasovagal syncope

The possible mechanism involves a sudden fall in venous return to the heart, rapid fall in ventricular volume, and virtual collapse of the ventricle because of vigorous ventricular contraction → stimulation of ventricular mechano-receptors and activation of Bezold–
Jarisch reflex leading to peripheral vasodilatation (hypotension) and bradycardia.

87

more pathophys of vasovagal syncope

Possible central sympathetic inhibition due to several neurotransmitters: serotonin, endorphins, and arginine vasopressin

88

older persons susceptible to vasovagal syncope because?

Hypertension, atherosclerotic cerebrovascular disease, cardiovascular medications, and impaired baroreflex sensitivity can cause dysautonomic responses during prolonged orthostasis (in which blood pressure and
heart decline steadily over time) and render older persons susceptible to vasovagal syncope. also Diuretic use further increase the risk of vasovagal syncope bc they cause you to become hypovolemic.

89

presentation of vasovagal syncope

The hallmark is hypotension and/or bradycardia sufficiently
profound to produce cerebral ischemia and loss of neural
function

90

Usually there is a precipitating factor/situation to cause vasovagal syncope such as?

Emotional stress(fight/flight response), anxiety, mental anguish, trauma, physical pain or anticipation of physical pain (e.g., anticipation of
venesection), warm environment, air travel, and prolonged
standing

91

vasovagal syncope classified into 3 types:

Cardioinhibitory (bradycardia), vasodepressor (hypotension), and mixed (both)

92

vasovagal syncope- Manifestations occur in 3 phases:

A prodrome (aura- ie taste in your mouth, smell, vision change), loss of consciousness, and
postsyncopal phase

93

*The most common triggers of vasovagal syncope in older patients:

*prolonged standing and vasodilator medications

94

Prodromal symptoms include: (elderly patients may not remember prodromal sx)

Extreme fatigue, weakness, diaphoresis, nausea, visual defects, visual and auditory hallucinations, dizziness, vertigo, headache, abdominal discomfort, dysarthria, and paresthesias

95

vasovagal syncope may mimic what? why?

seizure since during syncopal period some patients develop involuntary movements usually myoclonic jerks, but tonic– clonic movements also occur

96

Recovery for vasovagal syncope

Usually rapid, but older patients can experience protracted symptoms such as confusion, disorientation, nausea, headache, dizziness, and a general sense of ill health.

97

postprandial hypotension**

**In healthy older patients, systolic blood pressure falls by
11 to 16 mmHg, and heart rate rises by 5 to 7 beats/min
60 minutes after meals of varying compositions and
energy content**

98

postprandial hypotension*

***In older persons with hypertension, orthostatic
hypotension, and autonomic failure, the postprandial
blood pressure fall is much greater and without the
corresponding rise in heart rate. (heart rate can't go up in older patients sometimes bc of meds)

99

postprandial hypotension: Postprandial Physiologic
Changes

Increased splenic and superior mesenteric artery blood flow at the expense of peripheral circulation and a rise in plasma insulin levels without corresponding rises in
sympathetic nervous system activity.

Vasodilator effects of insulin and other gut peptides, including neurotensin and VIP contribute
to hypotension.

100

possible reasons for syncope dx- neuro

Neurally mediated
Orthostatic hypotension
Acute vertibrovascularstroke
Migraine
Seizure

101

possible reasons for syncope dx- endocrine

hypoglycemia, addison's disease

102

possible reasons for syncope dx- psych

psychogenic pseudosyncope

103

possible reasons for syncope dx- cardi

Acute coronary syndrome
Ventricular arrhythmias
A – V block
☼☼Wolff –Parkinson
White syndrome
Cardiac temponade
Aortic dissection
PE
Ruptured AAA
Acute A-Fib
Heart failure
Volume depletion
Sinus node dysfunction
Long QT syndrome
Aortic Stenosis
Hypertrophic cardiomyopathy
Mitral Stenosis
Atrial myxoma
Subclavian steal syndrome

104

syncope dx most important step

*most important tool is a careful history! It will suggest the correct cause and exclude other potential indicators. Hx should be focused on nature of events prior, during, and after syncope (i.e. supine position indicates probable cause of arrhythmia or seizure)

105

syncope dx- what should be ordered?

tests should be guided by h & p. Important to get SBP (supine and upright). Lab tests- serum electrolytes, glucose, hematocrit, blood and urine tox screening (to r/o drugs and etoh), cardiac enzymes (to r/o MI) and EKG should be done on all patients bc it could provide a clue to cause of syncope (e.g. prolongation or bundle branch block may indicate bradyarryhthmias)

106

if cardiac cause for syncope is suspected order?

step 1. echo, halter, stress test, lunh scan
step 2. EP study
step 3. carotid sinus message (CSM), upright tilt table test
step 4. Loop ECG

107

if neurally mediated is suspected for syncope order?

step1. CSM, tilt test
step2. echo, halter
step3. EP study (if heart disease)

108

if cerebrovascular or psychiatric cause is suspected for syncope order?

step1. psych eval
step2. EEG if seizures suspected
step3. doppler ultrasound of the carotid and vertebrobasilar systems
step4. MRI of cerebral vasculature