Nihss Stroke Scale Test A Answers

NIHSS Stroke Scale Test: A Comprehensive Guide to Scoring and Interpretation

The National Institutes of Health Stroke Scale (NIHSS) is a critical tool in the assessment of patients suspected of having an acute stroke. This standardized neurological examination provides healthcare professionals with a quantifiable method to evaluate stroke severity, track neurological improvement or deterioration, and predict patient outcomes. Understanding how to properly administer and score the NIHSS is essential for emergency physicians, neurologists, nurses, and other healthcare providers involved in stroke care.

Overview of the NIHSS Components

The NIHSS consists of 15 items that assess various neurological functions affected by stroke. Each item is scored on a scale of 0-3 or 0-4, with higher scores indicating greater impairment. The total score ranges from 0 to 42, with most strokes scoring between 5 and 25. The 15 items are:

1. Level of Consciousness
2. Questions
3. Commands
4. Gaze
5. Visual Fields
6. Facial Palsy
7. Motor Arm
8. Motor Leg
9. Limb Ataxia
10. Sensation
11. Language
12. Dysarthria
13. Extinction and Inattention

Detailed Breakdown of Each NIHSS Item

Section 1: Level of Consciousness (1A, 1B, 1C)

1A: Level of Consciousness assesses the patient's overall arousal and responsiveness.

• 0: Alert, keenly responsive
• 1: Not alert, but arousable by minor stimulation
• 2: Not alert, requires repeated stimulation to attend
• 3: Responds only with reflex motor or autonomic responses to noxious stimuli
• 4: Unresponsive

1B: Questions evaluates orientation by asking the patient month and age.

• 0: Answers both questions correctly
• 1: Answers one question correctly
• 2: Answers neither question correctly

1C: Commands tests the ability to follow commands by having the patient open and close the eyes and grip and release the non-paretic hand.

• 0: Performs both tasks correctly
• 1: Performs one task correctly
• 2: Performs neither task correctly

Section 2: Gaze

2: Gaze assesses eye movements by having the patient track horizontally and vertically.

• 0: Normal horizontal eye movements
• 1: Partial gaze palsy; gaze is abnormal in one or both eyes but complete gaze palsy is not present
• 2: Complete gaze palsy; cannot move eyes horizontally
• 3: Forced deviation, or total eye cannot be due to trauma/edema

Section 3: Visual Fields

3: Visual Fields evaluates visual fields by confrontation testing.

• 0: No visual field defect
• 1: Partial hemianopia
• 2: Complete hemianopia
• 3: Bilateral hemianopia (cortical blindness)

Section 4: Facial Palsy

4: Facial Palsy assesses symmetry of facial movements by having the patient show teeth, raise eyebrows, and close eyes tightly.

• 0: Normal symmetrical movements
• 1: Minor paralysis (flattened nasolabial fold, asymmetry on smiling)
• 2: Partial paralysis (total or near-total paralysis of lower face)
• 3: Complete paralysis of one or both sides

Section 5: Motor Arm

5: Motor Arm evaluates arm strength by having the patient hold arms outstretched for 10 seconds.

• 0: No drift, maintains 90° (or 45°) for full 10 seconds
• 1: Drifts, but does not hit bed; able to hold 90° (or 45°) for full 10 seconds
• 2: Drifts down to bed before 10 seconds, but does not hit bed
• 3: Drifts down and hits bed within 10 seconds
• 4: No effort against gravity; arm falls
• 5: No movement

Section 6: Motor Leg

6: Motor Leg evaluates leg strength similarly to the arm assessment.

• 0: No drift, holds 30° position for full 5 seconds
• 1: Drifts, but does not hit bed; holds 30° position for full 5 seconds
• 2: Drifts down to bed before 5 seconds
• 3: Drifts down and hits bed within 5 seconds
• 4: No effort against gravity, leg falls
• 5: No movement

Section 7: Limb Ataxia

7: Limb Ataxia assesses dysmetria by having the finger-to-nose and heel-to-shin tests.

• 0: Absent ataxia
• 1: Ataxia in one limb
• 2: Ataxia in two limbs
• Cannot be tested if limb plegic

Section 8: Sensation

8: Sensation evaluates sensory loss by pinprick in each limb.

• 0: Normal; no sensory loss
• 1: Mild-to-moderate sensory loss; patient feels pinprick but with "diminished" quality
• 2: Severe sensory loss; patient feels pinprick but with "abnormal" quality (e.g., dull)
• 3: No sensation

Section 9: Language

9: Language assesses language comprehension and expression.

• 0: No aphasia; normal speech
• 1: Mild-to-moderate aphasia; some obvious loss of fluency or comprehension, but without significant limitation
• 2: Severe aphasia; all communication is through fragmentary expression, great need for inference, questioning, or guessing
• 3: Mute, global aphasia; no usable speech or auditory comprehension

Section 10: Dysarthria

10: Dysarthria evaluates speech articulation.

• 0: Normal articulation
• 1: Mild-to-moderate dysarthria; patient slurs at least some words, but can be understood with little effort
• 2: Severe dysarthria; speech is so slurred as to be unintelligible in the absence of or out of proportion to any associated aphasia
• Cannot be tested if patient

10: Dysarthria evaluates speech articulation. - 0: Normal articulation - 1: Mild-to-moderate dysarthria; patient slurs at least some words, but can be understood with little effort - 2: Severe dysarthria; speech is so slurred as to be unintelligible in the absence of or out of proportion to any associated aphasia - 3: No speech production or incomprehensible speech; patient cannot communicate verbally

Conclusion
The comprehensive neurological assessment outlined above provides a structured framework for evaluating critical aspects of motor, sensory, and cognitive function. By systematically scoring each domain—from facial symmetry and limb strength to sensory perception, language, and speech—the clinician gains invaluable insights into the nature and extent of neurological impairment. This standardized approach not only aids in diagnosing conditions such as stroke, traumatic brain injury, or progressive neurodegenerative diseases but also establishes a baseline for monitoring disease progression or treatment efficacy. The grading system’s clarity ensures consistency across evaluations, facilitating communication among healthcare teams and enabling tailored interventions. Ultimately, this assessment underscores the importance of a holistic understanding of a patient’s neurological status, guiding both immediate care decisions and long-term rehabilitation strategies. By integrating objective measurements with clinical judgment, practitioners can optimize outcomes and enhance the quality of life for individuals affected by neurological disorders.

The duplication in Section 10: Dysarthria scoring noted in the provided text highlights a common point of clarification in clinical practice; the definitive version typically includes a score of 3 for absent or incomprehensible speech, as outlined in the second listing, while acknowledging that testing may be impossible if the patient is unresponsive, intubated, or has severe physical barriers to speech production. Clinicians must always document the reason if a section cannot be assessed, ensuring scores reflect true inability rather than untested domains. Administering this sensory and language battery requires careful attention to patient factors: fatigue, attention span, and emotional state can significantly influence performance, particularly in Sections 9 and 10 where sustained effort is needed for language tasks and clear articulation. For instance, a patient with severe aphasia might struggle to engage with sensory testing (Section 8) if instructions cannot be comprehended, necessitating adaptive techniques like using simple commands or demonstrating stimuli. Similarly, dysarthria evaluation must distinguish between motor speech impairment and aphasia-related communication breakdown; observing non-verbal communication (gestures, writing) and assessing oral motor strength independently aids accurate scoring. Environmental factors like background noise or poor lighting also warrant minimization to isolate neurological deficits from external interference.

Proper training is essential for reliable application, especially for subtle distinctions like the "abnormal" quality in Section 8, Score 2 (dull pinprick) versus intact sharp sensation, or differentiating mild dysarthria (Score 1) from mild aphasia affecting articulation. Inter-rater reliability improves significantly when examiners use standardized stimuli (e.g., specific pinprick devices, standardized reading passages) and adhere strictly to the defined criteria rather than relying on global impressions. This scale’s strength lies in its granularity—capturing nuances like sensory quality changes or the specific pattern of speech breakdown—that global scores might overlook, thereby informing lesion localization (e.g., cortical sensory loss vs. thalamic syndrome) and guiding targeted therapies such as constraint-induced movement therapy for motor deficits or melodic intonation therapy for non-fluent aphasia. Regular reassessment using this tool allows objective tracking of recovery trajectories or decline, proving invaluable in acute settings like stroke units where hourly changes may dictate interventions, and in chronic conditions like ALS or MS where subtle shifts signal need for care plan adjustments.

Conclusion
The comprehensive neurological assessment detailed herein transcends mere symptom checking; it embodies a principled approach to quantifying the nervous system’s integrity across interconnected domains. By translating complex clinical observations into standardized, actionable scores—from the subtlety of abnormal sensory quality to the profound impact of global aphasia—it empowers clinicians to move beyond subjective impression toward evidence-based decision-making. This structured methodology is indispensable not only for acute diagnosis and severity grading but also for fostering precise communication within multidisciplinary teams, ensuring that nuances in a patient’s evolving neurological landscape are neither missed nor misinterpreted. Critically, its value amplifies when integrated with clinical acumen: scores contextualized by patient history, imaging, and functional goals transform data into a roadmap for personalized rehabilitation, prognostic counseling, and resource allocation. While no scale captures the full lived experience of neurological illness, this framework provides the objective scaffold upon which compassionate, effective care is built. Ultimately, by marrying meticulous observation with rigorous standardization, it serves as a vital conduit—turning the complexity of neurological impairment into clarity that drives better outcomes, one assessed domain at a time. The true measure of its success lies not in the scores themselves, but in how those scores illuminate the path toward restoring function, dignity, and hope for every individual navigating the challenges of neurological disease.