CSL MED - CNS
Mon 19-08-02 0930
Dr SL Ho
GCS
1st check GCS
Measures conscious level
Eye Opening |
Verbal Response |
Motor Response |
Score |
|
Orientated |
Obey command |
5 |
Spontaneous |
Confused |
Localising to pain |
4 |
To speech |
Words |
Flexing |
3 |
To pain |
Sounds |
Extending |
2 |
None |
None |
None |
1 |
Range from 3-15
Note: dementia - fully alert but not orientated in time, place, person
COGNITIVE SKILL
|
Dominant Hemisphere Disorder |
Listen to language pattern Hesitant Fluent |
Expressive dysphagia Receptive dysphagia |
Pt understands simple/complex spoken commands? |
Receptive dysphagia |
Pt name objects |
Nominal dysphasia |
Pt read correctly? |
Dyslexia |
Pt writes correctly? |
Dysgraphia |
Numerical calculation (subtract 7) |
Dyscalculia |
Pt recognises objects? |
Agnosia |
|
|
|
Non-dominant Hemisphere Disorder |
Pt find way around ward / home? |
Geographical agnosia |
Pt dress himself? |
Dressing apraxia |
Pt can copy geometric pattern? |
Constructional apraxia |
MINI-MENTAL STATE EXAMINATION (MMSE)
ORIENTATION
5 ( ) What is the (year) (month) (date) (day) (month)?
5 ( ) Where are we: (state) (county) (town or city) (hospital) (floor)?
REGISTRATION
3 ( ) Name 3 common objects (eg., "apple, table, penny"):
Take 1 second to say each. Then ask the patient to repeat all 3 after you have said them. Give 1 point for each correct answer.
Then repeat them until he/she learns all 3. Count trials and record. Trials:
ATTENTION AND CALCULATION
5 ( ) Serial 7’s backwards. Give 1 point for each correct answer. Stop after 5 answers (100,93,86,79,65). Alternatively, spell "WORLD" backwards. One point for each correct letter.
RECALL
3 ( ) Ask for the 3 objects repeated above. Give 1 point for each correct answer (Note: Recall cannot be tested if all 3 objects were not remembered during registration.)
LANGUAGE
2 ( ) Name a "pencil," and "watch."
1 ( ) Repeat the following: "No ifs, ands, or buts."
3 ( ) Follow a 3-stage command: "Take a paper in your right hand, fold it in half, and put it on the floor."
1 ( ) Read and obey the following: Close your eyes.
1 ( ) Write a sentence. Score if it is sensible and has a subject and a verb
1 ( ) Copy the following design: intersecting pentagons, button/unbutton clothes
Total Score
UMN vs. LMN
Pyramidal system
Starts in primary motor cortex in brain
1st order MN: start from primary motor cortex ® 2nd order MN's
Lesion that affects 1st order MN gives UMN lesion
Lesion that affects 2nd order MN gives LMN lesion
Corticobulbar tract: primary motor cortex to BS
LMN lesion:
1. Bells palsy (affects CN VII): lesion in nerve itself
2. Bulbar palsy (stroke or tumour) affecting BS motor nuclei
CN EXAMINATION
I: Olfactory
Aromatic: coffee, perfume, camphor, mint, soap
Not-irritants: ammonia (stimulate pain receptors)
One nostril closed while Pt sniffs with other
II: Optic
Visual Acuity
Sit directly opposite Pt. Observe face: ptosis? Constricted pupils? Facial muscle wasting?
Ask Pt if he/she can see.
If yes, test visual acuity (modified Snellen chart, 14 inches from Pt).
Numerator; distance from Pt to obj. Denominator: size of figure (20/20: 20 (top) is distance bet eye and obj, 20 (bottom) is size of figure)
Test each eye separately
Chart ® count fingers ® move fingers ® light
Visual Fields
Dr and Pt eyes at same level
Cover one of Pt's eyes - Pt fixate on examiner's pupil
Test: upper temporal, lower temporal, lower nasal, upper nasal, central
Central scotoma: central vision blurred
Ophthalmoscopy
Pt fixate on distant obj away from bright light
Examiner (R) to Pt's (R)
Pupils
Size
Shape
Equality
Reaction to light ® direct, consensual
Reaction to accommodation + convergence ® pupil constriction with near obj
III (Oculomotor), IV (Trochlear) & VI (Abducens)
Eye movt
Fix pt's chin with Dr's hand: keep head in central plane
Do quite slowly
Look for nystagmus and conjugate gaze
At first keep in same horizontal plane as eyes
Don't take finger out too wide - causes physiological nystagmus
Do 'H' shape: up/down at extreme, extreme, centre
When eyes follow down, look for lid lag. Usually upper eyelid hits limbus of cornea.
Ptosis / exophthalmos = can see white of sclera above and below pupil
Disconjugate visual axis / eye movt: squint / strabismus
If prolonged (esp. children): adapt to disconjugate eye movt - therefore despite disconjugate eye movt, brain suppresses vision from one eye
Abnormal image: tends to be image that is further and more blurred
Can test (by covering one eye) which image is the one that disappears (which is the false image)
Pupillary Reflex
II: afferent
III: efferent (Edinger-Westphal)
Consensual and direct response
Accommodation
Pupil of neurosyphilis
Accommodation reflex intact but light reflex not normal (small irregular pupils)
Pt to look at obj far away in room, look at pen close to Pt's face. Pupils constrict
CN V
MOTOR
Muscles of mastication
2 x pterygoids: open + close. Never close mouth unopposed (support back of head)
Masseter: Pt bite
Temporalis: Pt to bite, feel at temples
Jaw reflex: hold patella hammer halfway; wrist action, loosen jaw, finger on mandible, hit it downwards, don't bounce back
Corneal reflex: touch on side of pupil, bilateral blink
SENSORY
Use toothpick
Opthalmic: to side of forehead
Maxillary
Mandibular: keep away from line of jaw
VII
Upper part of face: bilaterally innervated
Lower part: unilaterally innervated only
Look up (follow finger up): Frontalis
Screw up eyes: obicularis oculi
Facial n palsy (LMN): can only close affected part partially
Stroke: UMN facial palsy; can screw up eyes and raise frontalis (controlled by opposite hemisphere)
Back of head: C2
There is NO C1 dermatone
Don't ask to open mouth: this tests V
Show me your teeth: VII
Blow out cheeks
Taste: anterior 2/3 tongue
Stapedius: fixes eardrum (at loud noise, contracts immediately to protect eardrum). If VII palsy, LMN palsy, hyperacusis (noise sounds louder)
VIII
128 Hz: too low
Rinnes
Hit tuning fork, put on mastoid process, when can't hear buzzing anymore tell me, put by ear.
Air conduction should be better than bone
Repeat other side
Webers
Hit fork, put in centre of forehead
Bone conduction to both sides (should hear sound in centre)
Conductive deafness: sounds louder on that side (lateralised to that eye)
IX, X, XI
Use clean spatula (kept in envelope)
Push down on tongue: 'aaah' - uvula moves up. If moves to left, right-side is paralysed (vice versa)
Gag reflex: touch gently on pharynx (not blindly)
Ask Pt to speak: listen for dysarthria (baby hippopotamus, British constitution)
Dysarthria: articulation of speech
Dysphagia: higher mental function
Dysphonia: hoarse; larynx problem
Pt stick out tongue, move L/R, in/out (open mouth wide, keep tongue slightly in mouth, or else pt gets nervous and looks like fasciculations!)
Tongue power: stick tongue in cheek
XI: spinal accessory
Shrug shoulders (trazpezius)
SCM muscle
CEREBELLAR SYSTEM
Ask Pt to walk
Arm swing, cadence (rhythm)
Walk heel-toe
Nystagmus
Horizontal: cerebellar hemisphere lesion
Vertical: BS (rarer)
Make sure that hands are in same horizontal plane as Pt's eyes (or else you will confuse horizontal and vertical nystagmus)
Ask Pt to talk
Slurring of speech?
Check for drift
Drift with eyes closed; non specific
Finger-nose test
Stand perpendicular to Pt's plane
Put finger at arms-length from Pt (not too close!)
Pt's eyes open
Look for intention tremor: as nearing target (coarse tremor)
Don't move hand too much. If you make more difficulty by moving hand, only move when Pt's hand is going back to nose
Close eyes
Carry on touching
Don't move hand
Test for past-pointing (cerebellar sign: ipsilateral to lesion)
Dysdiadokinesis
Rapid repetitive movt
Clap hands - bottom hand still
Alt dorsum and palm of top hand (only when Pt has mastered clapping hands)
Then fine movt: tap 3rd finger against thumb (one side at a time)
Lower limbs
Heel-shin test: make sure heel is on shin
EPS (Extra Pyramidal System)
Check as part of PNS
EPS - eg. PD
Inspect
Symmetrical? Wasting (nerve > EPS)
Look for wasting at
1. 1st dorsal interosseous (bet thumb and index finger)
2. Hypothenar + thenar muscles
3. Deltoids
Fasciculation: tap forearm muscle, any fasciculation? Compare with other side? Don't make it too deliberate
Tone: hold wrist, can test across several jts (vs. power, which is tested only across one jt). Rotate wrist. Both sides
Power: Pt clasp hands in front of chest: test deltoids. Bicep curl, Dr try to extend elbow. Give position of adv. to Pt (triceps very weak in bicep curl position, therefore do not test tricep from this position). Test rest of muscles of upper limb
Reflex
Make sure it is the reflex of the muscle of the tendon you are hitting, not due to the impact of the hammer causing movt
Bicep
Brachioradialis tendon: 2 fingers on radial edge
- Primary movt is upward movt of forearm
- Also some flexion of phalanges
- Afferent: C6, Efferent C6 but also a little C7/8, thereby causing finger flexion
- Sometimes present in younger Pts, not usually in elderly
- Cervical myelopathy
Tricep tendon: just above olecranon
Sensation of upper limbs
Ask
Distribution of sensory loss?
Which modality?
Pain: test symmetrically with pin prick (toothpick)
Temp:
Vibration: if can feel distally, no need to test proximally
Proprioception: hold on sides of fingers (otherwise, up and down movt stimulates deep pressure sensors). Show Pt with eyes open what 'up' and 'down' are - then ask with eyes closed. Little movts. Don't move up and down and then stop up/down - no need.
Rhomberg's test (proprioception - not cerebellar test!)
Lower limbs
Never test power across 2 joints - eg. Testing bicep, hold forearm, not hand
Babinski response: don't confuse with withdrawal response. If no response, come back to it later. If still no response: LMN. If toes curl upward: UMN lesion
SUMMARY
Soft signs: sensory
Hard signs: reflexes - eg. Babinski, nystagmus
Pathonemonic: sign only in a specific disorder (very few)
If student is comfortable doing examination, examiner knows that student has been practising.