Acute Continuous Vertigo and Vomiting

An older adult develops sudden continuous spinning, vomiting, spontaneous nystagmus, and inability to walk unaided for ten hours. Speech and limb strength appear normal and early CT is unrevealing, but severe truncal instability and direction-changing gaze-evoked nystagmus raise posterior-circulation stroke. This is an acute vestibular syndrome, not a symptom label that can be assumed benign.

Case focus#

Determine whether the patient truly has acute vestibular syndrome, look for central eye, gait, hearing, and neurologic signs, and use HINTS only when spontaneous nystagmus is present and the examiner is trained. A negative CT or early MRI must not override persistent high-risk findings; stroke observation, vascular imaging, or repeat MRI may be necessary.

This analysis concentrates on the opening phase: building a usable problem representation, recognizing time-sensitive threats, and choosing the safest next action before diagnostic certainty is available.

Problem representation#

The useful representation is not a label alone. It combines the tempo of the problem, the setting, the physiologic or functional threat, the evidence already available, and the important information that is still missing. For this acute vestibular syndrome analysis, the working frame must remain broad enough to compare Posterior circulation ischemic stroke, Acute vestibular neuritis, Acute labyrinthitis, Benign positional vertigo without allowing a familiar first impression to become an untested conclusion.

The setting materially changes the plan: An emergency department with trained eye-movement examination, stroke activation, MRI, vascular imaging, neurology, and vestibular follow-up.. Available monitoring, access to consultation, travel time, record continuity, and the reliability of follow-through alter what counts as a safe next step. A plan that is reasonable in a continuously monitored environment may be unsafe when results return after discharge or urgent reassessment is difficult.

Immediate safety priorities#

• Central eye findings: Direction-changing gaze nystagmus, vertical or torsional nystagmus, skew deviation, normal head impulse in the correct syndrome, or impaired ocular alignment raises central pathology.
• Severe truncal or gait ataxia: Inability to sit, stand, or walk independently, falling without support, or disproportionate imbalance strongly raises cerebellar or brainstem stroke.
• New neurologic or headache sign: Diplopia, dysarthria, dysphagia, facial numbness, limb incoordination, weakness, severe new headache, neck pain, or altered consciousness requires emergency vascular evaluation.
• Acute hearing or vascular risk: New unilateral hearing loss with continuous vertigo, recent neck trauma, atrial fibrillation, vascular disease, severe hypertension, or anticoagulation increases central and labyrinthine ischemic concern.

These findings are action signals rather than diagnostic shortcuts. They determine the pace of stabilization, consultation, and escalation while the causal analysis continues in parallel.

Prioritized differential diagnosis#

Posterior circulation ischemic stroke#

What supports it. Sudden continuous vertigo, severe truncal ataxia, direction-changing or vertical nystagmus, skew, central HINTS findings, new hearing loss, vascular risk, or focal signs supports stroke.

What argues against it or keeps uncertainty open. A complete peripheral pattern in a properly selected patient and sustained recovery lowers probability, but early negative imaging does not independently exclude it.

Discriminating next step. Activate stroke evaluation, obtain MRI with diffusion and vascular imaging by risk, and repeat imaging or observe when high-risk findings persist after an early negative study.

Acute vestibular neuritis#

What supports it. Continuous vertigo for hours to days, spontaneous unidirectional horizontal-torsional nystagmus, abnormal head impulse toward one side, no hearing loss, and no central signs supports peripheral vestibular neuritis.

What argues against it or keeps uncertainty open. Direction-changing nystagmus, skew, normal impulse in the appropriate syndrome, severe truncal inability, hearing loss, or other neurologic signs argues against uncomplicated neuritis.

Discriminating next step. After stroke has been reasonably excluded, limit vestibular suppressants, consider time-sensitive corticosteroid discussion, and start early vestibular rehabilitation.

Acute labyrinthitis#

What supports it. A peripheral acute vestibular syndrome accompanied by new unilateral sensorineural hearing loss after infection supports labyrinthine involvement.

What argues against it or keeps uncertainty open. No hearing change favors neuritis, while central eye signs or vascular risk raises inner-ear or brainstem ischemia instead.

Discriminating next step. Confirm hearing promptly, evaluate infectious and vascular causes, and obtain ENT and stroke input according to phenotype rather than assuming all hearing loss is viral.

Benign positional vertigo#

What supports it. Brief triggered episodes lasting seconds with position-specific nystagmus and no continuous rest symptoms supports canalithiasis.

What argues against it or keeps uncertainty open. Ten hours of continuous vertigo, spontaneous nystagmus, persistent vomiting, and inability to walk is not a typical BPPV pattern.

Discriminating next step. Use positional testing only when episodes are triggered and intermittent, and perform the matching repositioning maneuver after central warnings are absent.

Toxic or metabolic dizziness#

What supports it. Sedatives, anticonvulsants, alcohol, hypoglycemia, electrolyte disturbance, carbon monoxide, or bilateral vestibulotoxic exposure can cause dizziness and ataxia.

What argues against it or keeps uncertainty open. A focal acute vestibular syndrome with unilateral or central eye findings and no exposure makes a diffuse toxic mechanism less likely.

Discriminating next step. Check glucose, medication and exposure history, electrolytes, ECG, and selected toxic testing while maintaining stroke evaluation for focal or high-risk signs.

The differential is ranked but not closed. Probability, consequence of delay, reversibility, and test burden are considered together. A dangerous alternative can deserve early exclusion even when it is not the statistically most likely explanation.

Evidence-gathering strategy#

• Confirm the vestibular syndrome and timing. Continuous versus episodic symptoms, spontaneous versus triggered onset, duration, nystagmus at rest, hearing, headache, neck pain, vascular risk, and exposure determine which examination applies. Interpretation: HINTS is not valid for brief positional dizziness or in a person without spontaneous nystagmus; syndrome classification precedes the test.
• Perform complete eye examination when trained. Nystagmus direction, head impulse, alternate cover for skew, ocular range, gaze holding, and fixation characterize peripheral and central vestibulo-ocular patterns. Interpretation: Any central component sustains stroke concern; an untrained or indeterminate examination should not be documented as reassuring.
• Assess gait, truncal control, hearing, and full neurology. Sitting, standing, walking, limb coordination, speech, swallowing, facial and limb sensation, strength, fields, and bedside hearing detect posterior circulation deficits. Interpretation: Severe truncal inability or new unilateral hearing loss can be the decisive high-risk finding even without limb weakness.
• Use glucose, ECG, and targeted laboratory testing. Hypoglycemia, arrhythmia, anemia, electrolyte disturbance, infection, medication effect, and anticoagulation alter mimics, treatment, and imaging safety. Interpretation: A correctable systemic abnormality is treated, but does not explain focal central eye or gait signs without further evidence.
• Select and repeat imaging by residual risk. CT detects hemorrhage but is insensitive for posterior ischemia; diffusion MRI and vascular imaging assess brainstem, cerebellum, and vertebrobasilar circulation. Interpretation: An early negative MRI lowers but does not eliminate stroke probability when central signs persist, justifying observation and repeat or complementary imaging.

Tests are selected because they can change a decision, not because a broad panel feels comprehensive. Results are interpreted with their timing, pretest probability, measurement limitations, recent treatment, and the possibility that an apparently reassuring value was obtained too early or under the wrong conditions.

Progressive course and interpretation#

Direction-changing nystagmus and inability to sit or stand safely sustain central concern despite an initially nondiagnostic MRI. The team activates a posterior-circulation stroke pathway, reviews vascular anatomy, and continues serial eye and neurologic examinations, with repeat diffusion or vascular imaging if the first study was obtained early and the high-risk phenotype persists.

The trajectory is evidence. Improvement after an intervention may support a mechanism without proving it, while nonresponse should prompt a check of the diagnosis, delivery of the intervention, timing, adherence, and competing pathology. Discordant data should be explained rather than averaged away.

Management reasoning#

• Activate posterior stroke care when indicated. Use reperfusion and stroke-unit pathways according to onset, imaging, eligibility, vessel status, bleeding risk, and local protocol without waiting for obvious weakness.
• Protect airway, hydration, and mobility. Treat vomiting, correct volume and glucose, assess swallowing, use fall precautions, and provide assisted transfers while diagnosis remains uncertain.
• Limit vestibular suppressants. Use antiemetics and vestibular suppressants briefly for severe symptoms because prolonged use can impair compensation, obscure examination, and increase falls.
• Rehabilitate confirmed peripheral disease. Begin vestibular exercises and graded mobility after central disease is excluded, with selected corticosteroid discussion for neuritis and hearing-directed care for labyrinthitis.
• Reassess before discharge. Confirm safe gait, oral intake, stable neurologic findings, imaging interpretation, vascular prevention when relevant, supervision, transport, and rapid return access.

Management remains proportional to severity and uncertainty. It includes explicit monitoring targets, foreseeable adverse effects, and stop or escalation conditions. Exact drug selection, dosing, and procedure details depend on verified individual factors, current local protocols, contraindications, and the responsible treating team; the analytical value here is the decision structure and its guardrails.

Communication and shared decisions#

Explain that posterior circulation stroke can cause isolated vertigo and imbalance without obvious weakness, and that early CT and even early MRI can miss small lesions. Describe the limits of the bedside eye examination, why observation or repeat imaging is recommended, and provide specific gait, speech, vision, hearing, and headache warnings.

The communication task includes what is known, what remains uncertain, why the next step is recommended, what alternatives exist, and which change should trigger urgent reassessment. Teach-back, qualified interpretation when needed, accessible formats, and a named owner for pending results turn information into a safer plan.

Continuity and safety net#

• Call emergency services for new double vision, slurred speech, swallowing trouble, facial or limb numbness, weakness, severe headache, neck pain, fainting, or inability to sit or stand.
• Return immediately for worsening imbalance, new hearing loss, repeated vomiting with dehydration, new neurologic symptoms, or recurrence after an initially negative early scan.
• Do not drive, climb, swim alone, or walk without assistance while severe vertigo, sedation, or gait instability persists.
• Before discharge, confirm the final syndrome, imaging limitations, safe mobility, medicine duration, stroke prevention if applicable, supervision, and the exact follow-up or repeat-imaging plan.

Follow-through is verified, not assumed. The record should identify who receives each pending result, the time window for reassessment, the contingency if contact fails, and the clinical or functional outcome that will show whether the plan is working.

Equity and systems analysis#

Account for access to MRI, vascular imaging, trained examiners, safe transport, mobility devices, language, and home supervision. Do not let age, disability, nausea, anxiety labels, or inability to describe dizziness in English lower the threshold for stroke assessment.

Access conditions belong in the causal model. Transportation, medication cost, work schedules, caregiving, health literacy, language, disability access, digital connectivity, and prior experiences of care can alter both the observed presentation and the feasibility of the plan. Addressing those constraints improves diagnostic validity as well as fairness.

Reasoning capabilities demonstrated#

• Classifies acute dizziness by timing and triggers before applying HINTS, positional testing, or an imaging pathway.
• Recognizes direction-changing nystagmus, skew, severe truncal ataxia, new hearing loss, and focal signs as central warnings.
• Uses HINTS only in acute vestibular syndrome with spontaneous nystagmus and a trained examiner, never as a casual screening acronym.
• Interprets negative CT and early MRI according to posterior-circulation sensitivity and residual clinical risk, with repeat imaging when warranted.
• Coordinates stroke treatment, vomiting and fall protection, brief symptom control, vestibular rehabilitation, mobility support, and accessible follow-up.

Key takeaways#

• Posterior circulation stroke can present with isolated continuous vertigo and imbalance without obvious limb weakness or speech change.
• HINTS is useful only in the correct acute vestibular syndrome and in trained hands; misuse can create dangerous reassurance.
• Early negative imaging does not override persistent central eye findings or inability to sit, stand, or walk safely.