Model experiments of otoconia stability after canalith repositioning procedure of BPPV

• Published in: Acta oto-laryngologica Vol. 130; no. 7; pp. 804 - 809
• Main Authors: Otsuka, Koji, Suzuki, Mamoru, Shimizu, Shigetaka, Konomi, Ujimoto, Inagaki, Taro, Iimura, Yoichi, Hayashi, Mami, Ogawa, Yasuo
• Format: Journal Article
• Language: English
• Published: Stockholm Informa UK Ltd 01.07.2010; Taylor & Francis; Informa
• Subjects: Acoustic Maculae - physiopathology; Animals; Benign Paroxysmal Positional Vertigo; Biological and medical sciences; CRP; Ear, auditive nerve, cochleovestibular tract, facial nerve: diseases, semeiology; Medical sciences; Models, Animal; Nervous system (semeiology, syndromes); Nervous system as a whole; Neurology; Non tumoral diseases; Otolithic Membrane - physiopathology; Otorhinolaryngology. Stomatology; postural restrictions; Posture - physiology; Rana catesbeiana; Vertigo - physiopathology; Equilibrium disorder; Otoconia; CRP; Nervous system diseases; Otolith repositioning; Stability; Internal ear disease; ENT disease; postural restrictions; ENT; Benign paroxysmal vertigo; Benign paroxysmal positional vertigo
• ISSN: 0001-6489; 1651-2251
• DOI: 10.3109/00016480903456318

Abstract Conclusion: Postural restrictions are probably not necessary after the canalith repositioning procedure (CRP). Objectives: Epley reported the effect of CRP for benign paroxysmal positional vertigo (BPPV). After CRP, patients are often requested to restrict postural change. However, some studies suggested that CRP may work without postural restrictions. The present study aimed to determine the necessity of post-maneuver postural restriction using the frog labyrinth model. Methods: The otoconial mass from the sacculus was placed on the utricular macular otoconia, mimicking a condition after CRP. The stability of the otoconial mass was observed by tilting the preparation, immediately, 3 min, and 5 min after it was placed on the macular otoconia. The utricular macula was maintained in the vertical plane for 10 s, during which period the behavior of the otoconial mass was observed. In experiment 1 the utricular macula was intact, in experiment 2 otoconia were partially removed, and in experiment 3 they were totally removed from the macula. Results: In experiments 1 and 2, in all preparations the otoconial mass became stabilized after 3 min. Even in experiment 3, in most preparations the otoconial mass became stabilized after 5 min.