Dizziness and unstable gait in the older adults are associated with vestibular hypofunction, muscle dysfunction and sleep disturbance: impact on prevention of accidental falls.

Background: Dizziness and unstable gait with resultant falls are common symptoms among the older adults. Most of studies have focused on statistical analysis regarding single factor related to dizziness and unstable gait. On the other hand, there are very few comprehensive studies using a large number of patients except several review papers.

Methods: We retrospectively analyzed a total of 164 aged patients with dizziness and unstable gait. The patients underwent description of the Japanese version of the Dizziness Handicap Inventory (DHI), measurements of vestibular function, handgrip muscle strength, physical performance, height-adjusted appendicular skeletal muscle mass, and vitamin B1 and B12, a full-night polysomnography study, cognition test and visual test.

Results: Average age was 80.5 ± 6.1 years and ranged from 59 to 91 years. Forty-eight were males and 116 females. Three causative factors, namely vestibular hypofunction, muscle dysfunction and sleep disturbance, were independently and combinedly associated with dizziness and unstable gait in over 93% of the patients. Patients with higher scores defined by these three causative factors had higher scores of DHI. 23% of the patients showed vitamin B1 and/or B12 deficiency, which was highly associated with sarcopenia/frailty. Cognitive and visual impairment were recognized in 4.9% and 5.0%, respectively.

Conclusion: Dizziness and unstable gait were mainly associated with vestibular hypofunction, muscle dysfunction and sleep disturbance. In addition, vitamin B1 and B12 deficiency, and cognitive and visual impairment secondarily contribute to dizziness and unstable gait. Appropriate selection of treatment according to the underlying causes would prevent accidental falls among the older adults.