Use of sodium bicarbonate for acute dizziness after minor head injury

ObjectiveDizziness after minor head injury (mHI) is common. In some eastern countries, it is treated with 7% sodium bicarbonate solution (SB). This prospective study evaluated the clinical efficacy of SB compared with normal saline (NS).Material and methodsFrom April 2009 to April 2010, we performed a prospective observational study on 228 patients (68% female, 32% male) with acute dizziness after mHI. At the emergency physician’s discretion, intravenous SB (1 mL/kg) in NS (250 mL) or NS (250 mL) was administered to 166 patients and 62 patients, respectively, as empiric antidizziness therapy. Outcome measures were severity of dizziness and treatment response, which were measured by a visual analog scale. Various characteristics were compared between treatment groups. Any continued dizziness of the patients during follow-up was also compared with their pre-injury condition, such as prior psychiatric disorders and the presence of vertigo.ResultsThe SB group had their visual analog scale scores reduced by 25.4% compared with 24.6% in the NS group. Both groups showed a statistically significant reduction in dizziness (p < 0.001); however, the dizziness improvement did not differ significantly between the two treatment groups (p = 0.699). Sixty-four patients (28.1%) suffered from continued dizziness during follow-up (mean period, 22.4 ± 28.9 days). The prevalence of continued dizziness was higher in patients with prior psychiatric disorders, although this was not statistically significant (40% vs. 27.2%, p = 0.276), whereas patients with prior vertigo did not experience a higher dizziness relapse rate (27% vs. 28.2%).ConclusionsSB and NS administrations are both effective individually when treating patients with acute dizziness from mHI; however, both results may be attributable to the placebo effect. Therefore more research is necessary to understand the complex conditions that determine the effects of SB on this disorder.