摘要
Objective:This study aims to analyze the clinical characteristics of persistent geotropic and apogeotropic positional nystagmus of LC-BPPV in view of light and heavy cupula discussion.Material and method:The study group includes 184 patients with LC BPPV(98 apogeotropic,86 geotropic type)who have been examined between 2009 and 2020.Ninety-nine females and 85 males,aged between 16 and 92 years were included(Ageotropic 49.32±14.12,geotropic 44.49±13.90 years).Average slow phase velocity(SPV)of positional nystagmus was documented and those with persistent directionchanging positional nystagmus lasting more than a minute were grouped separately.Age,gender difference,side of involvement,and recurrence pattern were particularly reviewed.Chi-square and One way ANOVA tests were used to compare the difference between groups.Statistical significance was set at P<0.05.Results:Thirty-seven patients with apogeotropic nystagmus(30.7%;37/98)and 18 patients with geotropic nystagmus(20.9%;18/86)had persistent nystagmus(p?0.05).Comparison of slow phase velocity(SPV)of persistent and non-persistent geotropic and apogeotropic positional nystagmus of the affected side was significant(p?0.05).Comparison of average age,male to female ratio,side of involvement,and the recurrence rate in patients with persistent and non-persistent geotropic and apogeotropic type positional nystagmus groups were not significant(p=0.177,p=0.521,p=0.891,p=0.702).Conclusion:Persistent geotropic and apogeotropic positional nystagmus is mostly correlated with the size,amount,and position of otoconial debris.It is difficult to justify the light cupula as a new geotropic variant of cupular pathology.Patients with persistent positional nystagmus present similar therapeutic outcomes and recurrence rates.
