ArticleCureus2026
Horizontal Semicircular Canal Benign Paroxysmal Positional Vertigo Presenting With Biphasic Nystagmus in the Healthy Ear-Down Position.
Article in Cureus, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
0 citing papers in PubMed.
No citing paper in PubMed yet.
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
1 author.
Funding
No grant is acknowledged in the PubMed record.
Abstract
In horizontal semicircular canal benign paroxysmal positional vertigo (HSC-BPPV) due to canalolithiasis, biphasic nystagmus is typically observed in the affected ear down or in both ear-down positions during the supine head-roll test. This report describes a case of HSC-BPPV with biphasic nystagmus observed only in the healthy ear-down position. A 59-year-old male had a one-day history of rotational vertigo when turning to the right. The supine positional nystagmus test produced left-beating horizontal nystagmus in the face-up position. In the left-ear-down position, there was biphasic nystagmus (i.e., left-beating horizontal nystagmus followed by right-beating horizontal nystagmus). In the right-ear-down position, there was right-beating horizontal nystagmus. The first-phase nystagmus observed in the left-ear-down position was stronger than the right-beating nystagmus in the right-ear-down position. The patient was initially diagnosed with left-sided HSC-BPPV (canalolithiasis), and the Lempert roll maneuver was performed. Re-examination the following day revealed findings consistent with right-sided HSC-BPPV (cupulolithiasis). Biphasic nystagmus can occur with the presumed healthy ear-down during the supine head-roll test. Misidentification of the affected side in HSC-BPPV (canalolithiasis) may lead to an inappropriate therapeutic maneuver and suboptimal treatment. In the present case, the affected side was initially misidentified, and persistent direction-changing apogeotropic nystagmus consistent with HSC-BPPV (cupulolithiasis) was observed after the maneuver. Although the mechanism underlying this change remains speculative and is based on a single case, clinicians should recognize that biphasic nystagmus during the head-roll test does not necessarily identify the affected ear. Careful interpretation of all positional nystagmus findings is warranted before performing a therapeutic maneuver.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.