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Neurosciences Department of Neurology Department of Neurosurgery Health Topics A-Z Health Topics by Category
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Stroke and Brain Attack
NIH Stroke Scale Definitions
Harold Adams MD, Patricia Davis MD, James Torner PhD, Karla Grimsman RN, Jeff Vande Berg MS
Peer Review Status: Internally Peer Reviewed
Each Examination is assessed independently from previous
examinations.
A response must be checked for each item, using the following
definitions:
1.a. Level of
Consciousness
This global measure of responsiveness is assessed by the
patient's interactions with the physician at the bedside when the
patient is first examined. The physician should stimulate the
patient (by patting or tapping the patient) to determine the best
level of consciousness. On occasion, more noxious stimuli, such as
pinching, may be required to check the level of consciousness.
0 = Alert - Patient is fully alert and keenly responsive
1 = Drowsy - Patient is drowsy but can be aroused with
minor stimulation. The patient obeys, answers, and responds to
commands
2 = Stuporous - Patient is lethargic but requires
repeated stimulation to attend. The patient may need painful or
strong stimuli to respond to or follow commands.
3 = Coma - Patient is comatose and responds only with
reflexive motor or automatic responses. Otherwise, the patient is
unresponsive.
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1.b. LOC - Questions
Level of Consciousness - Questions is checked by asking
the patient to respond to two questions. The patient is asked the
month of the year and his/her age. The answer must be correct -
there is no partial credit for being close (for example, being off
by one year in age). If the patient gives the wrong initial answer
but then corrects it, the answer should still be scored as
incorrect. Other measures of orientation such as time of day,
location, etc. are not asked as part of this examination. If the
patient has aphasia, the physician should judge the responses to
questions in light of the language impairment.
0 = Answers BOTH correctly.
1 = Answers ONE correctly.
2 = BOTH incorrect.
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1.c. LOC - Commands
The Level of Consciousness - Commands is checked by
asking the patient to follow two commands. The patient is asked to
open and close his/her eyes and then is asked to make a grip
(close and open his/her hand). Only the initial response is
scored. If a patient is aphasic and unable to follow verbal
commands, the patient may imitate these movements (pantomime). For
a patient who has hemiparesis, the response in the unaffected limb
should be measured. For example, if the patient has a left
hemiparesis, making a fist with the right hand is a normal
response to the command. If a paralyzed patient does try to move
the limb in response to a command but is unable to form a fist, it
is counted as a normal response.
0 = Obeys BOTH correctly
1 = Obeys ONE correctly
2 = BOTH incorrect
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2. Gaze
The position of the eyes at rest and movement of the eyes
to command are tested. First look at the position of the eyes at
rest. Spontaneous eye movements to the left are right should be
noted. The patient is then asked to look to the left or right.
Only horizontal eye movements are tested. Disorders of vertical
gaze, nystagmus, or skew deviation are not measured. Reflexive eye
movements (oculocephalic or oculovestibular) should be tested in
patients who are unable to respond to commands. If a patient has
ocular rotatory problems, such as a strabismus, but leaves the
midline and attempts to look both right and left, he/she should be
considered to have a normal response. If a patient has an isolated
oculorotatory problem, such as an oculomotor (CN III) or abducens
(CN IV) palsy, the score should be 1. If the patient has a
conjugate deviation of the eyes that can be overcome by voluntary
or reflexive activity, the score should be 1. If there is a
conjugate lateral deviation that is NOT overcome with reflexive
movements, the score should be 2.
0 = Normal - The patient has normal lateral eye
movements
1 = Partial Gaze Palsy - Patient is unable to move one
or both eyes completely to both directions.
2 = Forced Deviation - The patient has conjugate
deviation of the eyes to the right or left, even with reflexive
movements.
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3. Visual Fields
Visual fields of both eyes are examined. In most cases,
the physician asks the patient to count fingers in all four
quadrants. Each eye is independently tested. If a patient is
unable to respond verbally, the physician should check responses
(attending) to visual stimuli in the quadrants or have the patient
hold up the number of fingers seen. A quadrantic field cut should
be scored 1. The entire half field (both upper and lower
quadrants) should be involved with a dense field loss to be scored
2. If a patient has severe monocular visual loss due to intrinsic
eye disease and the visual fields in the other eye are normal, the
physician should score the visual fields are normal. If the
patient has monocular blindness due to primary eye disease and the
visual fields in the other, "normal" eye demonstrate a partial or
dense visual field defect, the visual loss should be scored as 1,
2, or 3 as appropriate.
0 = No visual loss
1 = Partial hemianopia - There is a partial visual field
defect in both eyes. Included is a quadrantic field defect or
sector field defect.
2 = Complete hemianopia - There is dense visual field
defect in both eyes. A homonymous hemianopia is included.
3 = Bilateral hemianopia - There are bilateral visual
field defects in both eyes. Cortical blindness is included.
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4. Facial Movement (Facial
Paresis)
The patient is examined by looking at the patient's face
and noting any spontaneous facial movements. The facial movements
in response to commands are also tested. Such commands may include
asking the patient to grimace or smile, to puff out his/her
cheeks, to pucker, and to close his/her eyes forcefully. If the
patient is aphasic and is unable to follow commands, the physician
should have the patient attempt imitative (pantomime) responses.
The facial responses to painful stimuli (grimace) may substitute
for responses to commands in a patient who has decreased levels of
alertness.
0 = Normal facial movements No asymmetry.
1 = Minor paresis Asymmetrical facial movements or
facial asymmetry at rest. This response may be noted with a
spontaneous smile but not with forced facial movements.
2 = Partial paresis Unilateral "central" facial paresis.
Decreased spontaneous and forced facial movements with changes
most prominent at the mouth. Orbital and forehead musculature
movements are normal.
3 = Complete palsy Dysfunction involves forehead,
orbital, and circumoral muscles (the entire distribution of the
facial nerve). Deficits may be unilateral or bilateral (facial
diplegia) complete facial paresis.
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5. Motor Function - Arms
(Left and Right)
The patient is asked to extend his arm outstretched in
front of the body at 90 degrees (if sitting) or at 45 degrees (if
supine). The effort is for a full 10 seconds. the physician should
count to ten aloud to encourage the patient to maintain the limb's
position. If a limb is paralyzed, the physician may wish to test
any "normal" limb first. If a patient is aphasic, directions may
be achieved by non-verbal cues or pantomime. Patients may be
"helped" by the physician by placing the limb in the desired
position. If the patient has restricted limb function due to
arthritis or non-stroke related limitations, the physician should
attempt to judge the "best" motor response. If the patient has
decreased level of consciousness, an estimate of response to
noxious stimuli should be measured. Volitional motor responses
that are performed well should be graded as 0. If the patient has
reflexive responses, such as flexor or extensor posturing, the
response should be scored as 4. The only indication for scoring
this item as 9 - untestable, is if the limb is missing or
amputated, or if the shoulder joint is fused. A patient with a
partial limb amputation should be tested.
0 = No drift The patient is able to hold the
outstretched limb for 10 seconds.
1 = Drift The patient is able to hold the outstretched
limb for 10 seconds but there is some fluttering or drift of the
limb. If the limb falls to an intermediate position, the score is
1.
2 = Some effort against gravity The patient is not able
to hold the outstretched limb for 10 seconds but there is some
effort against gravity.
3 = No effort against gravity The patient is not able to
bring the limb off the bed but there is some effort against
gravity. If the limb is raised in the correct position by the
examiner, the patient is unable to sustain the position.
4 = No movement The patient is unable to move the limb.
There is no effort against gravity.
9 = Untestable May be used only if the limb is missing
or amputated, or if the shoulder joint is fused.
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6. Motor Function - Leg
(Right and Left)
The supine patient is asked to hold the outstretched leg
30 degrees above the bed. The limb should be held in this position
for 5 seconds. The physician should count to 5 aloud to encourage
the patient to maintain the limb's position. If the right leg is
paralyzed, the examiner may wish to examine the "normal" left leg
first. If a patient is unable to follow verbal commands, nonverbal
cues may be used, or the limb may be placed in the desired
position. If the patient has a decreased level of consciousness,
an estimate of response to noxious stimuli should be measured.
Volitional motor responses that are performed well should be
scored 0. If the patient has reflexive responses, such as flexor
or extensor posturing, the response should be scored 4. The only
indication for scoring this item as 9 - untestable is if the limb
is missing or if the hip joint is fused. Patients with artificial
joints or partial limb amputations should be tested.
0 = No drift The patient is able to hold the
outstretched limb for 5 seconds.
1 = Drift The patient is able to hold the outstretched
limb for 5 seconds but there is unsteadiness, fluttering, or drift
of the limb.
2 = Some effort against gravity The patient is unable to
hold the outstretched limb for 5 seconds but there is some effort
against gravity.
3 = No effort against gravity The patient is not able to
bring the limb off the bed but there is effort against gravity. If
the limb is placed in the correct position, the patient is unable
to sustain the position.
4 = No movement The patient is unable to move the limb.
There is no effort against gravity.
9 = Untestable May be used only if limb is missing or
hip joint is fused.
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7. Limb Ataxia
This item is aimed at examining the patient for evidence
of a unilateral cerebellar lesion. It will also detect limb
movement abnormalities related to sensory or motor dysfunction.
Limb ataxia is checked by the finger-to-nose and heel-to-shin
tests. The physician should test the "normal" side first. The
movements should be well performed, smooth, accurate, and
non-clumsy. There should not be any dysmetria or dyssynergia.
Non-verbal cues may be given to the patient. If a patient has
dysmetria or dyssynergia in one limb, the score should be 1. If a
patient has dysmetria or dyssynergia in both the arm and leg on
one side, or if there are bilateral signs, the score should be 2.
If limb ataxia is present, the ataxia should be rated as present
regardless of the possible etiology. This item may be scored 9 -
untestable only if there is complete paralysis of the limbs (All
Motor Function scores = 4), if the limb is missing, amputated, or
fused, or if the patient is comatose (item 1.a., LOC = 3).
0 = Absent The patient is able to perform both the
finger-to nose and heel-to-shin tasks well. The movements are
smooth and accurate.
1 = Present unilaterally in either arm or leg The
patient is able to perform one of the two required tasks well.
2 = Present unilaterally in both arm and leg or
bilaterally The patient is unable to perform either task well.
Movements are inaccurate, clumsy, or poorly done.
9 = Untestable May be used only if all Motor Function
Scores = 4, limb is missing, amputated, or fused, or if item 1.a.,
LOC = 3.
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8. Sensory
The patient is examined with a pin in the proximal
portions of all four limbs and asked how the stimulus feels. The
patient's eyes do not need to be closed. The patient is asked if
the stimulus is sharp or dull and if there is any asymmetry
between the right and left sides. Only sensory loss that can be
attributed to stroke should be counted as abnormal - usually this
will be a hemisensory loss. Sensory loss due to a non-stroke
related condition, such as a neuropathy, should not be graded as
abnormal. If a patient has depressed level of consciousness,
neglect, aphasia or is unable to describe the sensory perception,
the patient's non-verbal responses, such as a grimace or
withdrawal, should be graded. If the patient responds to the
stimulus, it should be scored 0. The response to the stimulus on
the right and left sides should be compared. If the patient does
not respond to a noxious stimulus on one side, the score should be
2. Patients with severe depression of consciousness should be
examined.
0 = Normal No sensory loss to pin is detected.
1 = Partial loss Mild to moderate diminution in
perception to pin stimulation is recognized. This may involve more
than one limb.
2 = Dense loss Severe sensory loss so that the patient
is not aware of being touched. Patient does not respond to noxious
stimuli applied to that side of the body.
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9. Best Language
The patient's language will be tested by having the
patient identify standard groups of objects and by reading a
series of sentences. Comprehension of language should be judged as
the physician performs the entire neurologic examination. The
physician should give the patient adequate time to identify the
objects on the sheet of paper. Only the
first response is measured. If the patient misidentifies the
object and later corrects himself, the response is still
considered abnormal. The physician should then give the patient a
sheet of paper with the series of
sentences. The examiner should ask the patient to read at
least three sentences. The first attempt to read the sentence is
measured. If the patient misreads the sentence and later corrects
himself, the response is still considered abnormal. If the
patient's visual loss precludes visual identification of objects
or reading, the examiner should ask the patient to identify
objects placed in his/her hand and the examiner should judge the
patient's spontaneous speech and ability to repeat sentences. If
the examiner judges these responses as normal, the score should be
0. If the patient is intubated or is unable to speak, the examiner
should check the patient's writing.
0 = No aphasia The patient is able to read the
sentences well and is able to correctly name the objects on the
sheet of paper.
1 = Mild to moderate aphasia The patient has mild to
moderate naming errors, word finding errors, paraphasias, or mild
impairment in comprehension or expression.
2 = Severe aphasia The patient has severe aphasia with
difficulty in reading as well as naming objects. Patient with
either Broca's or Wernicke's aphasia is included here.
3 = Mute
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10. Dysarthria
The primary method of examination is to ask the patient
to read and pronounce a standard list of
words from a sheet of paper. If the patient is unable to read
the words because of visual loss, the physician may say the word
and ask the patient to repeat it. If the patient has severe
aphasia, the clarity of articulation of spontaneous speech should
be rated. If the patient is mute or comatose (item 9, Best
Language = 3 ) or has an endotracheal tube, this item can be rated
as 9 - untestable.
0 = Normal articulation Patient is able to pronounce the
words clearly and without any problem in articulation.
1 = Mild to moderate dysarthria Patient has problems in
articulation. Mild to moderate slurring of words is noted. The
patient can be understood but with some difficulty.
2 = Near unintelligible or worse Patient's speech is so
slurred that it is unintelligible
9 = Untestable May be used only if item 9, Best Language
= 3, or if the patient has an endotracheal tube.
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11. Neglect (Extinction and
Inattention)
The presence of neglect is examined by the patient's
ability to recognize simultaneous cutaneous sensory and visual
stimuli from the right and left sides. The visual stimulus is a
standard picture. The picture is shown to
the patient and s/he is asked to describe it. The physician should
encourage the patient to scan the picture and identify features on
both the right and left sides of the picture. The physician should
encourage the patient to compensate for any visual loss. If the
patient does not identify parts of the picture on one side, the
result should be considered abnormal. The physician then assesses
the ability to recognize bilateral simultaneous touch to upper or
lower limbs. The test is done by touching the patient with the
patient's eyes closed. The test should be considered abnormal if
the patient ignores sensory stimuli from one side of the body. If
the patient has a severe visual loss and the cutaneous stimuli are
normal, the score should be 0. If the patient has aphasia and is
unable to describe the picture, but does attend to both sides, the
score should be 0.
0 = No neglect The patient is able to recognize
bilateral simultaneous cutaneous stimuli on the right and left
sides of the body and is able to identify images on the right and
left sides of the picture.
1 = Partial neglect The patient is able to recognize
either cutaneous or visual stimuli on both the left and right, but
is unable to do both successfully (unless severe visual loss or
aphasia is present).
2 = Complete neglect The patient is unable to recognize
either bilateral cutaneous sensory or visual stimuli.
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