BANK: APEX NIH STROKE
SCALE GROUP B MASTERY
(2026/2027 UPDATE)
PART 0: THE NAVIGATOR
Cognitive Tier Section Focus Target Competency Question Range
Tier 1 Foundational Syntax & Core definitions, Q1 – Q15
Application 11-Item baseline rules,
TNKase metrics
Tier 2 Complex Application & Minor deficit Q16 – Q35
Simulation assessment, isolated
palsies, Ataxia rules
Tier 3 Grandmaster Synthesis The "Coma Cascade," Q36 – Q60
intubation overrides, AI
imaging logic
PART I: THE PRIMER
Mastering the APEX NIH Stroke Scale (NIHSS) Group B Assessment translates directly to elite
clinical execution, allowing you to accurately triage ischemic penumbra and deploy
thrombolytics within razor-thin therapeutic windows. This is not a rote memory exercise; it is the
mechanistic blueprint required to function as a high-reliability diagnostic sensor on the modern
stroke floor.
The "Critical Axioms" Cheat Sheet
● The "Score What You See" Absolute: You evaluate current physical capacity, not
potential, not history, and not intent. Never coach the patient. Never grant "extra credit" for
prior injuries.
● The Coma Default (1a=3) Cascade: If a patient scores a 3 on Item 1a, they are totally
unresponsive. By universal rule, 1b=2, 1c=2, Motor (5/6) defaults to the highest deficit (4),
, Ataxia (7) is 0 (untestable), Sensory (8) is 2, Language (9) is 3, Dysarthria (10) is UN, and
Extinction (11) is 2.
● The Ataxia Paradox: Ataxia (Item 7) can only be scored if the patient possesses the
motor strength to attempt the movement. If the limb is paralyzed (Score 4) or the patient is
comatose, Ataxia is ALWAYS 0.
● The 2026 Tenecteplase (TNKase) Standard: For acute ischemic stroke (AIS) within the
4.5-hour window, the standard dose is strictly 0.25 mg/kg (Max 25 mg) delivered as a
single IV bolus.
PART II: THE ELITE TEST BANK
TIER 1: Foundational Syntax & Application
Q1: During an NIHSS baseline assessment, the examiner must evaluate Item 1a (Level of
Consciousness). The patient is unresponsive to voice and light touch but makes a
non-stereotyped, purposeful movement to push the examiner's hand away when intense
noxious stimulation is applied to the sternum. Based on the principles of the NIHSS, which
action/conclusion is the MOST ACCURATE? A) Score 0, as the patient demonstrated
purposeful movement. B) Score 1, as the patient required stimulation to respond. C) Score 2, as
the patient required strong/painful stimulation to make non-stereotyped movements. D) Score 3,
as the patient is not alert to verbal commands.
● The Answer: C (Score 2, as the patient required strong/painful stimulation to make
non-stereotyped movements.)
● Distractor Analysis:
○ A is incorrect: A score of 0 requires the patient to be keenly responsive and alert
without physical stimulation.
○ B is incorrect: Minor stimulation failed to arouse the patient; deep noxious stimuli
were required.
○ D is incorrect: A score of 3 requires the patient to be completely unresponsive or
display only reflexive/stereotyped posturing, not purposeful avoidance.
The Mentor's Analysis: Item 1a determines the trajectory of the entire neurological exam.
When facing altered mentation, the immediate priority is escalating stimuli sequentially from
voice to deep pain. By utilizing progressive noxious stimuli, you bypass the common trap of
prematurely labeling a patient comatose. Professional/Academic Intuition: A score of 3
requires absolute non-purposeful flaccidity or reflex posturing only.
Q2: When testing Item 1b (LOC Questions), the examiner asks the patient their exact age and
the current month. The patient provides the correct month but gives an age that is off by two
years. The patient is not intubated and has no physical barriers to speech. Based on the
principles of the NIHSS, which action/conclusion is the MOST ACCURATE? A) Score 0, as the
age provided was reasonably close. B) Score 1, as the patient answered exactly one question
correctly. C) Score 2, as the age was incorrect, invalidating the cognitive test. D) Score UN, as
the examiner cannot verify if the patient simply forgot their birthday.
● The Answer: B (Score 1, as the patient answered exactly one question correctly.)
● Distractor Analysis:
○ A is incorrect: The NIHSS explicitly forbids granting partial credit for "close"
answers.
○ C is incorrect: The patient answered one question (the month) flawlessly, earning
, one point of credit.
○ D is incorrect: Item 1b is never marked Untestable unless a physical barrier
completely prevents any communication.
The Mentor's Analysis: Item 1b is a strict binary test of orientation and memory retrieval. When
facing minor cognitive deficits, the immediate priority is assessing exact accuracy without clinical
sympathy. By utilizing rigid binary scoring rules, you bypass the common trap of granting
sympathy points for near-misses. Professional/Academic Intuition: In Item 1b, exactitude is
mandatory; close is still mathematically wrong.
Q3: The examiner moves to Item 1c (LOC Commands), instructing the patient to open and close
their eyes, and then to grip and release the non-paretic hand. The patient opens their eyes but
fails to close them, and does not attempt to grip the hand. Based on the principles of the NIHSS,
which action/conclusion is the MOST ACCURATE? A) Score 0, as the patient initiated the first
part of the command. B) Score 1, as the patient completed half of the eye command. C) Score
2, as the patient failed to completely execute either of the two distinct tasks. D) Score 3, to
indicate total failure of command execution.
● The Answer: C (Score 2, as the patient failed to completely execute either of the two
distinct tasks.)
● Distractor Analysis:
○ A is incorrect: Initiation is not completion. The task is a full cycle. * B is incorrect:
The command is "open and close." Opening without closing is a failed task.
○ D is incorrect: Item 1c is scaled exclusively from 0 to 2. A score of 3 does not exist
for this metric.
The Mentor's Analysis: A command in the NIHSS is a complete physiological circuit. When
facing command execution, the immediate priority is verifying the complete dual-action of the
specific instruction. By utilizing strict task completion criteria, you bypass the common trap of
scoring partial movements as full successes. Professional/Academic Intuition: Item 1c
maxes out at 2, and half a movement equals zero credit for that task.
Q4: A patient presents with a suspected middle cerebral artery (MCA) occlusion. During Item 2
(Best Gaze), the patient exhibits a strong, sustained gaze preference to the right. The examiner
uses the oculocephalic maneuver (doll's eyes), and the patient's eyes briefly but clearly cross
the midline to the left. Based on the principles of the NIHSS, which action/conclusion is the
MOST ACCURATE? A) Score 0, because the eyes eventually crossed the midline. B) Score 1,
indicating a partial gaze palsy because the deviation was overcome reflexively. C) Score 2,
indicating a forced deviation because the voluntary preference is so strong. D) Score UN,
because the examiner had to use a physical reflex rather than a verbal command.
● The Answer: B (Score 1, indicating a partial gaze palsy because the deviation was
overcome reflexively.)
● Distractor Analysis:
○ A is incorrect: The patient has a clear, pathological resting gaze preference.
○ C is incorrect: Forced deviation (Score 2) is documented only if the gaze palsy
cannot be overcome by any means, including the oculocephalic reflex.
○ D is incorrect: The oculocephalic maneuver is explicitly authorized by the NIHSS to
test gaze when voluntary tracking fails.
The Mentor's Analysis: Item 2 differentiates between a partial field preference and total cortical
disruption of the extraocular pathways. When facing a severe gaze preference, the immediate
priority is attempting to break the deviation mechanically. By utilizing the oculocephalic reflex
test, you bypass the common trap of confusing a strong voluntary preference with true, fixed
forced deviation. Professional/Academic Intuition: If the eyes can cross the midline by any