The interpretation of static positional nystagmus in a balance clinic.

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The interpretation of static positional nystagmus in a balance clinic.

Int J Audiol. 2017 Sep 01;:1-9

Authors: Jeffery H, Hopkins M, Anderson R, Patel V, Rogers J

Abstract
OBJECTIVE: To review the current criteria for the interpretation of positional nystagmus (PN).
DESIGN: Videonystagmography data on PN was collected for 90 patients presenting for balance testing with a history of vertigo or imbalance (excluding those diagnosed with benign paroxysmal positional vertigo). These were compared to normative data from 90 asymptomatic subjects. A literature review was carried out regarding threshold criteria for clinically significant PN. These were evaluated using the data collected.
STUDY SAMPLE: Clinic group: 90 patients; 37 male, 53 female. Age range 15-82 years. Normative group: Ninety subjects; 31 male, 59 female. Age range 21-79 years.
RESULTS: PN was seen in 75.6% of the clinic group and in 50% of the normative group. The prevalence of nystagmus of slow phase velocity (SPV) > 3°/s was significantly higher in the clinic group than the normative group. The maximum SPV recorded in each position was greater from the clinic group than the normative group.
CONCLUSIONS: This study supports the use of normative thresholds for SPV for both horizontal and vertical PN. A normative threshold of >3°/s for horizontal and >7°/s for vertical nystagmus is proposed.

PMID: 28859528 [PubMed - as supplied by publisher]

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