Sunday, April 7, 2024

A SCHEME OF EXAMINATION OF CENTRAL NERVOUS SYSTEM


1. Higher Mental Functions:


1. Level of Consciousness:

   - Determine if the individual is:

     - Fully awake/alert

     - Drowsy

     - Lethargic

     - Unconscious/comatose


2. Response to Stimuli:

   - Evaluate how the person responds to:

     - Verbal commands

     - Visual stimuli (e.g., waving a hand)

     - Painful stimuli (e.g., sternal rub)


3. Orientation: Awareness of surroundings, time, and personal identity.

   - Assess if the person is oriented to:

     - Person: Do they know who they are?

     - Place: Are they aware of where they are?

     - Time: Do they know the date, time, and current events?


4. Memory: Ability to retain and recall information, including short-term and long-term memory.

   - Test memory function by assessing:

     - Immediate recall (e.g., repeating three objects)

     - Recent memory (e.g., recalling events from the past few hours)

     - Remote memory (e.g., recalling significant life events)


5. Cognitive Function:

   - Evaluate cognitive abilities such as:

     - Attention (Capacity to focus on specific stimuli while filtering out distractions)

      - Concentration 

     - Language (Understanding and production of spoken and written language)

     - Communication skills

     - Problem-solving and abstract thinking

    - Executive Function: Higher-order cognitive processes like planning, problem-solving, and decision-making.


These functions are crucial for daily functioning and are assessed to diagnose and manage conditions such as dementia, traumatic brain injury, ADHD, and schizophrenia

NOTES:

   - Mini-Mental State Examination (MMSE): A widely used test to assess cognitive function, including orientation, memory, attention, and language.

   - Clock Drawing Test: Evaluates visuospatial/executive function and can indicate cognitive impairment.

   - Hamilton Rating Scale for Depression (HAM-D): Assesses mood, insight, and psychomotor activity in individuals with depression.



2. Cranial Nerve Examination:

   - Cranial Nerve I (Olfactory):

     - Smell Identification Test: Assesses olfactory function.

   - Cranial Nerve II (Optic):

     - Visual Acuity Test (Snellen Chart): Measures distance vision.

     - Visual Field Examination (Confrontation Test): Screens for visual field defects.

     - Fundoscopic Examination: Evaluates the optic nerve head and retina.

   - Cranial Nerves III, IV, VI (Oculomotor, Trochlear, Abducens):

     - Extraocular Movements (EOM) Test: Assesses eye movement in different directions.

     - Pupillary Light Reflex Test: Checks pupillary reaction to light.

   - Cranial Nerve V (Trigeminal):

     - Corneal Reflex Test: Tests sensory function of the trigeminal nerve.

     - Jaw Jerk Reflex Test: Evaluates motor function of the trigeminal nerve.

   - Cranial Nerve VII (Facial):

     - Facial Symmetry Test: Assesses facial muscle strength and symmetry.

     - Taste Sensation Test: Evaluates taste sensation on anterior two-thirds of the tongue.

   - Cranial Nerve VIII (Vestibulocochlear):

     - Audiometry: Assesses hearing acuity.

     - Vestibular Function Tests: Evaluate balance and inner ear function.

   - Cranial Nerves IX, X (Glossopharyngeal, Vagus):

     - Gag Reflex Test: Checks the gag reflex and swallowing function.

   - Cranial Nerve XI (Accessory):

     - Shoulder Shrug Test: Assesses trapezius muscle strength.

     - Head Rotation Test: Evaluates sternocleidomastoid muscle function.

   - Cranial Nerve XII (Hypoglossal):

     - Tongue Movement Test: Assesses tongue movement and strength.


NOTE:

1. Cranial Nerve I - Olfactory Nerve (Smell):

   - Abnormality: Anosmia - Loss of sense of smell, which can result from various conditions such as nasal trauma, sinus infections, or neurological disorders.


2. Cranial Nerve II - Optic Nerve (Vision):

   - Abnormality: Visual Field Defects - Loss of vision in specific areas of the visual field, which can occur due to conditions like glaucoma, optic neuritis, or stroke.


3. Cranial Nerves III, IV, VI - Oculomotor, Trochlear, Abducens (Eye Movements):

   - Abnormality: Diplopia - Double vision, often caused by weakness or paralysis of the extraocular muscles due to conditions like cranial nerve palsies or muscle disorders.


4. Cranial Nerve V - Trigeminal Nerve (Sensation of Face and Jaw Movement):

   - Abnormality: Trigeminal Neuralgia - Intense, stabbing facial pain along the distribution of the trigeminal nerve, typically triggered by touch or movement.


5. Cranial Nerve VII - Facial Nerve (Facial Expression and Taste):

   - Abnormality: Bell's Palsy - Unilateral facial paralysis resulting in weakness or inability to control facial muscles, often due to inflammation or compression of the facial nerve.


6. Cranial Nerve VIII - Vestibulocochlear Nerve (Hearing and Balance):

   - Abnormality: Sensorineural Hearing Loss - Loss of hearing due to damage to the inner ear or auditory nerve, resulting in difficulty hearing faint sounds or understanding speech.


7. Cranial Nerves IX, X - Glossopharyngeal, Vagus Nerves (Swallowing and Speech):

   - Abnormality: Dysphagia - Difficulty swallowing, which can occur due to neurological disorders, stroke, or structural abnormalities in the throat or esophagus.


8. Cranial Nerve XI - Accessory Nerve (Head and Shoulder Movement):

   - Abnormality: Shoulder Droop - Weakness or paralysis of the trapezius muscle, resulting in difficulty elevating the shoulder on the affected side.


9. Cranial Nerve XII - Hypoglossal Nerve (Tongue Movement):

   - Abnormality: Tongue Deviation - Weakness or paralysis of the tongue muscles, causing the tongue to protrude or deviate to one side when extended.


   - Snellen Eye Chart: Measures visual acuity for the optic nerve (CN II).

   - Fundoscopic Examination: Evaluates the retina and optic disc for signs of pathology related to CN II.

   - Corneal Reflex Test: Evaluates the integrity of CN V (trigeminal) and CN VII (facial) by stimulating the cornea and observing the blink response.

   - Taste Strips: Tests taste sensation for CN VII (facial) and CN IX (glossopharyngeal).

   - Rinne and Weber Tests: Assess hearing for CN VIII (vestibulocochlear).



3. Sensory System:

- Light Touch Test: Evaluates tactile sensation using cotton wool or a brush.

- Sharp/Dull Discrimination Test: Tests pain sensation using a safety pin.

- Temperature Discrimination Test: Assesses temperature sensation using warm and cold objects.

- Vibration Sensation Test (Tuning Fork): Checks vibration sense in distal extremities.

- Proprioception Test: Assesses joint position sense and awareness of limb position.


NOTE:

- Pinprick Test: Assesses pain sensation.

- Temperature Test: Evaluates temperature sensation.

- Two-Point Discrimination Test: Measures tactile discrimination and assesses touch sensation.

- Vibration Test (Rydel-Seiffer tuning fork): Evaluates proprioception


4. Motor System:

- Muscle Strength Testing (Manual Muscle Testing): Evaluates strength of major muscle groups using standardized grading.

- Muscle Tone Assessment (Modified Ashworth Scale): Determines muscle tone at rest and with passive movement.

- Coordination Tests:

- Finger-to-Nose Test: Assesses coordination and accuracy of movements.

- Heel-to-Shin Test: Evaluates coordination and smoothness of movements.

- Rapid Alternating Movements (RAM): Tests coordination and motor planning.


NOTE:

- Manual Muscle Testing (MMT): Evaluates muscle strength using a scale from 0 to 5.

- Modified Ashworth Scale: Assesses muscle tone, particularly in individuals with spasticity.

- Finger-to-Nose Test: Evaluates coordination and is sensitive to cerebellar dysfunction.



5. Reflexes:

- Deep Tendon Reflexes (DTR):

- Biceps Reflex

- Triceps Reflex

- Brachioradialis Reflex

- Patellar Reflex

- Achilles Reflex

- Superficial Reflexes:

- Plantar Reflex (Babinski Sign)

- Abdominal Reflexes



NOTES :

- Deep Tendon Reflexes (DTR):

- Biceps Reflex: Tests C5-C6 nerve roots.

- Patellar Reflex: Tests L2-L4 nerve roots.

- Plantar Reflex (Babinski Sign): Tests the integrity of the corticospinal tract and can indicate upper motor neuron lesions.


6. Gait:

- Observation of Gait: Assesses posture, rhythm, speed, and stability during walking.

- Tandem Walking Test: Assesses balance and coordination by asking the patient to walk heel-to-toe in a straight line.

-Romberg Test: Evaluates proprioception and vestibular function by assessing balance with eyes open and closed.

- Gait Speed Test: Measures the time taken to walk a specific distance to assess mobility and functional status.


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