The HINTS exam

Hints Exam in Vertigo: Diagnosis and Interpretation

Overview of the Hints Exam

• The hints exam is crucial for patients experiencing prolonged vertigo, nausea, vomiting, and difficulty walking. Symptoms worsen with position changes like standing from lying down.

• Spontaneous nystagmus (nagus) can be observed in these patients, often indicating vestibular neuritis but potentially signaling a stroke. The hints exam helps differentiate between these conditions.

Components of the Hints Exam

Nystagmus Test

• The test involves observing nystagmus during primary gaze and lateral gaze to assess its characteristics. Normal volunteers show no nystagmus when fixating on an object.

• To eliminate fixation suppression of nystagmus, a piece of paper can be placed between the patient's head and the wall while they look at the wall. This may reveal previously hidden nystagmus symptoms.

Observations in Patients

• In a patient with vestibular neuritis, left-beating unidirectional nystagmus is noted; it increases when looking left and decreases when looking right, indicating a consistent directionality which is reassuring in diagnosis.

• Conversely, direction-changing or bidirectional nystagmus raises concern as it may indicate central nervous system issues rather than peripheral causes like vestibular neuritis.

Test of Skew

• The cover-uncover test assesses vertical eye movement deviations by covering one eye and observing any shifts upon uncovering it; abnormal movements suggest skew deviation which is worrisome in this context.

• An example shows upward movement of one eye upon uncovering while the other moves downward—indicative of abnormal vertical skew deviation that warrants further investigation.

Head Impulse Test

• This test evaluates nerve function related to vestibular issues; an abnormal finding suggests a peripheral problem rather than a brain issue—a counterintuitive yet critical insight for diagnosis.

• Proper execution involves stabilizing the patient's skull while they focus on an object; brisk head movements are made to check for catch-up saccades indicative of abnormal responses suggesting vestibular dysfunction.

Interpreting Results

• A normal head impulse test indicates no nerve problems; however, if abnormalities are present alongside acute vertigo symptoms, this could imply central pathology instead—highlighting diagnostic importance in clinical settings.

• For reassurance in diagnosing vestibular neuritis via hints exam results must include unidirectional nystagmus, absence of vertical skew deviation, and an abnormal head impulse test result—all three components must align for reliable conclusions about patient condition status.

Key Takeaways

• Perform the hints exam only on patients with hours or days of continuous vertigo accompanied by spontaneous nystagmus to ensure accurate assessment and avoid misdiagnosis with tests like Dix-Hallpike that serve different purposes within similar symptom presentations.