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Experts investigated the diagnosis, etiology & mechanism of spontaneous downbeat nystagmus (sDBN) in patients with dizziness/vertigo (n=54). Most DBN cases (70.4%) had episodic vestibular syndrome, with clear etiology in over half, including cerebellar lesions & vestibular migraine. Peripheral DBN cases exhibited distinct nystagmus patterns during positional testing. DBN cases have decreased posterior semicircular canal gain, aiding in diagnosis.

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Experts investigated the diagnosis, etiology & mechanism of spontaneous downbeat nystagmus (sDBN) in patients with dizziness/vertigo (n=54). Most DBN cases (70.4%) had episodic vestibular syndrome, with clear etiology in over half, including cerebellar lesions & vestibular migraine. Peripheral DBN cases exhibited distinct nystagmus patterns during positional testing. DBN cases have decreased posterior semicircular canal gain, aiding in diagnosis.
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