Background
Dizziness accounts for approximately 4% of emergency department (ED) visits, with stroke representing a critical but infrequent underlying etiology. While missed strokes in this population are known to be rare, data on the clinical outcomes of patients who experience subsequent strokes post-discharge remain limited. This study by Kerber et al. quantifies the 30-day cumulative incidence of stroke-related disability or mortality following ED discharge for dizziness, providing actionable insights for clinical decision-making.
Study Design
The retrospective cohort analysis included 77,315 adults discharged home after an index ED dizziness visit within Kaiser Permanente Southern California (2016–2020). Primary endpoints were stroke hospitalization and stroke hospitalization with disability/mortality (defined as discharge to non-home settings) within 30 days. Kaplan-Meier estimates calculated cumulative incidence, and imaging findings/acute interventions were descriptively analyzed.
Key Findings
Stroke Incidence and Outcomes
The 30-day cumulative incidence of stroke hospitalization was 0.12% (94 cases; 1 in ~830 visits), while stroke with disability/mortality occurred in 0.04% (33 cases; 1 in ~2,500 visits). Anterior fossa lesions predominated (59% of strokes).
Interventions
Acute management included thrombectomy (5%), thrombolytics (1%), and neurosurgical interventions (2%). Supportive measures like mechanical intubation (10%) and gastrostomy (3%) were notably required.
Expert Commentary
These findings reinforce that catastrophic outcomes from missed strokes are statistically rare but clinically consequential. The anterior fossa predominance suggests vertebrobasilar strokes may be underrepresented, warranting further study. Limitations include retrospective design and potential unmeasured confounders in a integrated health system population.
Conclusion
While severe outcomes are uncommon, clinicians should prioritize risk stratification tools (e.g., HINTS exam) for high-risk dizziness presentations. System-level strategies to optimize follow-up for select patients may mitigate residual risk.