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TitleDescriptionSubject
1 Assessing for hyperventilation-induced nystagmusHyperventilation induced nystagmus is tested by asking the patient to take quick deep breaths (~1/s) for 40-60 seconds. This increases ICP and CSF pH. This can be helpful in diagnosing irritative conditions of the vestibular nerve, including an acoustic neuroma (see video, https://collections.lib....Hyperventilation
2 Hyperventilation-induced downbeat nystagmus in a cerebellar disorderThis is a 45-year-old woman with a chronic progressive cerebellopathy of unclear etiology (worsening over at least 10 years) characterized by gait and limb ataxia, gaze-evoked nystagmus, saccadic pursuit and vestibulo-ocular reflex suppression, an esotropia greater at distance, along with very mild ...Hyperventilation; Jerk Nystagmus; Downbeat Nystagmus; Downbeat Nystagmus; Cerebellar Pathology
3 Upbeat and downbeat nystagmus due to anti-VGCC antibodiesSeen here are two patients who presented with imbalance and vertical oscillopsia, the first with upbeat nystagmus, and the second with downbeat nystagmus. Both patients were found to have voltage-gated calcium channel antibodies in serum without evidence of systemic malignancy. The UBN patient had m...Jerk Nystagmus, Upbeat Nystagmus, Gaze Evoked Nystagmus, Downbeat Nystagmus
4 Vibration and hyperventilation-induced nystagmus from vestibular schwannomaThis is a 50-yo-woman with imbalance, and with fixation removed on her examination (with Frenzel goggles), there was no spontaneous nystagmus. Using a handheld vibrator to vibrate the mastoids and vertex, there was a rightward slow phase and corrective leftward fast phase (left-beating nystagmus). V...Jerk Nystagmus, Vestibular Nystagmus, Hyperventilation
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