CNS Examination For MD Residents

Key ConceptsThis chapter covers how to structure scoring for the CNS Mental Status Examination (MSE) domains: orientation, attention, memory, language, and executive function. You need a consistent framework so you can document deficits, grade severity, and link findings to likely neuroanatomy.

Core exam requirements (must know):Orientation (person, place, time): score each domain separately; note what is wrong (e.g., date vs location).

Attention: choose one brief task (e.g., digit span, serial 7s, months backwards); score accuracy and persistence (distractibility).

Memory:

Immediate recall: reflects attention/working memory.

Delayed recall: reflects longer-term storage (often hippocampal networks).

Cued vs uncued: helps distinguish encoding/storage vs retrieval.

Language: test comprehension, naming, repetition, and fluency; score errors by type (aphasic pattern vs dysarthria/word-finding pauses).

Executive function: assess abstraction, set-shifting, and planning (e.g., similarities, Luria-like sequencing); score concrete vs perseverative responses.

Documentation style: use short phrases like “Oriented to person/place, disoriented to time (date)” rather than “confused.”

Before you continue:Can you list the subcomponents you would score under orientation, attention, memory, language, and executive function, and what each deficit pattern suggests?

Key TermsOrientation - Awareness of person, place, and time, scored separately.

Attention - Ability to maintain/select information (working memory vs distractibility).

Immediate recall - Memory for information just presented (often attention/working memory dependent).

Delayed recall - Recall after a delay (more related to storage/retrieval processes).

Aphasia - Language impairment due to cortical dysfunction (e.g., comprehension, naming, repetition, fluency).

Executive dysfunction - Impairment in planning, abstraction, set-shifting, and self-monitoring.

Cued recall - Recall after a hint/category cue; useful for separating encoding vs retrieval problems.

Active RecallOrientation - _____________

__________

Attention - _____________

__________

Immediate recall - _____________

__________

Delayed recall - _____________

__________

Aphasia - _____________

__________

Executive dysfunction - _____________

__________

Cued recall - _____________

__________

Worked ExamplesExample 1 (Orientation + Attention, straightforward)A patient says the correct name, knows they are in hospital, but gives the wrong date. Digit span is 4 forward, 2 forward after distraction.

Orientation:

Person: correct

Place: correct

Time: disoriented (date)

Attention:

Digit span 4 forward = impaired/low-normal depending on your reference

Drop to 2 after distraction suggests poor sustained attention

Now you try:Document orientation and attention in one-line MSE style.

Person: _____________

Place: _____________

Time: _____________

Attention task result: _____________

__________

__________

__________

Example 2 (Memory with cued vs uncued recall)Given 3-word learning, immediate recall is 3/3. After 5 minutes: delayed recall is 1/3 uncued, 3/3 with category cue.

Immediate recall: 3/3 → encoding/attention adequate

Delayed recall uncued: 1/3 → retrieval difficulty or storage/encoding vulnerability

Cued recall: 3/3 → cue restores access → more consistent with retrieval/strategy issue than complete storage failure

Now you try:Write a brief interpretation of uncued vs cued delayed recall.

Immediate recall: _____________

Delayed uncued: _____________

Delayed cued: _____________

Likely interpretation: _____________

__________

__________

__________

Example 3 (Language + Executive function, pattern recognition)Patient speaks fluently but naming is impaired; comprehension is intact; repetition is poor....