& x20;Which features help distinguish central nystagmus from peripheral nystagmus? - INI-CET EXAM -2026

INI-CET EXAM -2026

Medical & Surgical Nursing (E5)

Easy

Appeared in: INI-CET EXAM -2026

Explanation

The correct answer includes all the listed options because the clinical differentiation between central and peripheral nystagmus relies on a combination of features, not just one.
Direction of eye movement (e.g., unidirectional vs. changing direction), duration of the episode, latency (delay in onset after a trigger), and fatigability (whether it lessens on repeat testing) are all classic signs used in neurological exams.
Peripheral nystagmus is typically unidirectional, has a latency period, is fatigable, and has a short duration.
Central nystagmus can be multidirectional (including purely vertical), has no latency, is non-fatigable, and can be sustained.
Therefore, considering all these features together provides the most accurate diagnosis.

Option A: This option is incomplete. While direction and duration are important distinguishing features, they are not the only ones. Latency and fatigue are also critical for a comprehensive assessment.
Option B: This option is incomplete. Latency (the delay before nystagmus starts) is a key feature, particularly in peripheral nystagmus like BPPV, but it is only one of several characteristics used for differentiation.
Option C: This option is incomplete. Fatigue (whether the nystagmus diminishes with repeated testing) is an important sign, but it must be evaluated alongside other features like direction, duration, and latency for an accurate diagnosis.

Clinical Relevance

Nursing practice connection: This is primarily an exam-oriented knowledge point with limited direct bedside application, so retain Differentiating features of central vs. peripheral nystagmus as background academic context rather than a clinical decision trigger.
Distinguishing between central and peripheral nystagmus is a critical nursing and medical assessment skill. The cause determines the urgency and type of intervention.
Peripheral nystagmus often points to benign conditions of the inner ear, like Benign Paroxysmal Positional Vertigo (BPPV), which can be managed with specific maneuvers (e.g., Epley maneuver).
Central nystagmus is a red flag for serious neurological conditions like a stroke, brain tumor, or multiple sclerosis, requiring immediate neurological consultation and imaging.

How to Approach the Question

First, read the question carefully to understand what is being asked. The question asks for the 'features' (plural) that distinguish two types of nystagmus.
Next, evaluate each option individually. Is 'Direction and duration' a valid feature? Yes. Is 'Latency' a valid feature? Yes. Is 'Fatigue' a valid feature? Yes.
Recognize that options A, B, and C are all correct, individual features used in the assessment.
When you encounter an 'All of the above' option and have confirmed that multiple other options are correct, 'All of the above' is the most comprehensive and likely the correct answer.
This approach prevents you from choosing a partially correct answer when a more complete option is available.

Concept Tested & Keywords

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E6 Medicine Harrison 22e Part 1 p. 204-206

E6 Medicine Davidson Principles Practice 24e p. 1110-1112