Quiz-395-Section One

What anatomical structure serves as the primary donor of otoconial debris in benign paroxysmal positional vertigo?

Vestibular Anatomy and Otoconial Function

The saccule macula due to its vertical linear acceleration sensitivity

The utricle macula because of horizontal orientation and degenerative susceptibility

The posterior semicircular canal ampulla where debris accumulates first

The crista ampullaris within the semicircular canal lumen

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A 67-year-old patient describes feeling like they "might pass out" when standing quickly, with greying vision but no sense of rotation. How should the paramedic classify this symptom?

Dizziness Phenomenology Classification

True vertigo requiring urgent vestibular assessment

Oscillopsia suggesting bilateral vestibulo-ocular reflex dysfunction

Disequilibrium indicating multisystem postural control impairment

Presyncope reflecting cerebral hypoperfusion rather than vestibular pathology

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A patient exhibits persistent nystagmus lasting greater than one minute during Dix-Hallpike positioning without latency before onset. Which pathological mechanism best explains this finding?

Canalolithiasis Versus Cupulolithiasis Distinction

Canalolithiasis with free-floating debris settling at the canal's gravitational nadir

Cupulolithiasis with otoconia adherent to the cupula surface rendering it gravity-sensitive

Superior canal dehiscence causing pressure-induced third window effects indicating multisystem postural control impairment

Vestibular neuritis producing continuous spontaneous nystagmus

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Which semicircular canal variant accounts for approximately 85–90% of all benign paroxysmal positional vertigo cases?

Canal-Specific BPPV Distribution and Anatomy

Anterior canal due to its superior anatomical position

Horizontal canal as the second most frequently involved structure

Posterior canal owing to its gravitational dependency when upright

All canals are affected with equal frequency in population cohorts

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In a patient with recurrent BPPV episodes over two years, which modifiable risk factor has RCT-level evidence supporting supplementation to reduce recurrence?

Canal-Specific BPPV Distribution and Anatomy

Magnesium supplementation to improve neuromuscular stabilisation

Vitamin D deficiency correction addressing calcium metabolism and otoconial integrity

Iron supplementation correcting anaemia-related cerebral perfusion deficits

Thiamine supplementation preventing Wernicke's encephalopathy progression

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