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Onset time of benign paroxysmal positional vertigo
1a Department of Otolaryngology , Ichijo Ear, Nose and Throat Clinic , Hirosaki , Japan.
Conclusion:
Benign paroxysmal positional vertigo (BPPV) is strongly related to sleep. This study proposes a micro-otoconia accumulation theory in which the pathological debris is an aggregate of micro-otoconia over a long time period, and which begins to slide by its own weight during sleep.
Objectives:
To examine the onset time of idiopathic BPPV and to investigate its etiology.
Method:
Patients (n = 351) were classified as posterior canalolithiasis (PC), horizontal canalolithiasis (HC), and horizontal heavy cupula (HHC) according to nystagmus findings. This study examined the medical records, and categorized the onset times into the following four groups; (1) during sleep, (2) at the time of rising, (3) morning, and (4) afternoon.
Results:
PC (n = 135): In 33 patients, vertigo occurred during sleep, in 69 patients at rising, in 10 patients in the morning, and in 23 patients in the afternoon. HC (n = 87): In 38 patients, vertigo occurred during sleep, in 30 patients at rising, in eight patients in the morning, and in 11 patients in the afternoon. HHC (n = 129): In 27 patients, vertigo occurred during sleep, in 59 patients at rising, in 15 patients in the morning, and in 28 patients in the afternoon.
Insights
Benign paroxysmal positional vertigo (BPPV) often occurs during sleep. A new theory suggests micro-otoconia accumulation leads to debris sliding under its own weight during sleep, causing BPPV onset.
Area of Science:
- Neurology
- Otolaryngology
- Vestibular System Disorders
Background:
- Benign paroxysmal positional vertigo (BPPV) is a common vestibular disorder.
- The exact etiology of idiopathic BPPV remains incompletely understood.
- Sleep-related onset of BPPV has been anecdotally observed.
Purpose of the Study:
- To investigate the temporal patterns of idiopathic BPPV onset.
- To explore potential etiological factors, particularly relating to sleep.
Main Methods:
- Retrospective analysis of 351 BPPV patients.
- Classification into posterior canalolithiasis (PC), horizontal canalolithiasis (HC), and horizontal heavy cupula (HHC).
- Categorization of onset times: during sleep, upon rising, morning, and afternoon.
Main Results:
- A significant proportion of BPPV cases occurred during sleep across all subtypes (PC: 33/135, HC: 38/87, HHC: 27/129).
- Vertigo onset during sleep was observed in 24.4% of PC, 43.7% of HC, and 21.0% of HHC patients.
- Onset upon rising was also frequent, particularly in PC (69/135) and HHC (59/129) subtypes.
Conclusions:
- BPPV onset shows a strong association with sleep and the transition to wakefulness.
- The findings support a 'micro-otoconia accumulation theory,' where accumulated debris slides due to gravity during sleep.
- Further research into sleep-related mechanisms could elucidate BPPV etiology.
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