Impact of COVID-19 on Future Ischemic Stroke Incidence

Ischemic strokes in COVID-19: risk factors, obesity paradox, and distinction between trigger and causal association

Background and purpose

Stroke has been described as a COVID-19 complication. However, its occurrence rate, risk factors, and causal relationships are still not well established.

Methods

We describe the characteristics of confirmed COVID-19-related strokes among all cases of COVID-19 hospitalized in our health network, from November 1, 2020 to April 30, 2021. Risk factor analysis has been conducted for ischemic stroke (IS), which represents 92% of all confirmed cases of Covid-19-related strokes, and a "causal attribution to infection" classification is provided.

Results

In all, 62/4105 hospitalized COVID-19 patients had an acute stroke (1.51%). Severe COVID-19 (OR 2.27-CI 1.06-4.77; p = 0.032), atrial fibrillation (OR 3.65-CI 1.63-7.98; p = 0.001), and ischemic heart disease (OR 4.590-CI 1.714-12.137; p = 0.002) proved to be independent risk factors for IS, while obesity was a protective factor (OR 0.90-CI 0.82-0.97; p = 0.012). COVID-19 had a causal role in 32.1% of IS cases, was a relevant cofactor in 28.6% of cases of IS, and was a possible trigger in 39.3% of events.

Conclusion

Our stroke occurrence rate is consistent with other population-based reports (range 0.34-2.7%). Prespecified peculiar clinical and radiological features allow the distinction between "IS caused by COVID-19" and "IS triggered by COVID-19." Clinical history of vascular diseases and risk factors is crucial in determining the risk of IS in patients with COVID-19. However, the protective effect of a BMI > 30 kg/m2 seems to suggest an obesity paradox.

Trends in outpatient rehabilitation use for stroke survivors

BACKGROUND

Stroke survivors with residual disabling deficits who are medically stable may be recommended for acute rehabilitation or outpatient therapy, depending partly on the severity of their deficits. Here we sought to determine if the location at which patients needing rehabilitation post-stroke has shifted from inpatient to an outpatient setting.

METHODS

For analysis, we used our Institutional Review Board-approved Get With The Guidelines®-Stroke Database to study stroke survivors discharged to receive either inpatient or outpatient rehabilitation services between 2014 and 2019. Logistic regression analysis was used to identify clinical factors associated with discharge type. Cochran-Armitage trend analysis was used to assess differences in rehabilitation services used over time.

RESULTS

A total of 3293 patients were included. Trend analysis demonstrated a significant increase over time in the proportion of patients needing rehabilitation being discharged home with rehabilitation services (P < 0.0001). In addition, older age was associated with discharge to inpatient rehabilitation (OR = 1.018, 95%CI, 1.011-1.026), as was a higher National Institutes of Health Stroke Scale score (OR = 1.149, 95%CI, 1.130-1.168).

CONCLUSIONS

We found that home discharges increased, highlighting outpatient rehabilitation as an expanding healthcare resource for reducing stroke-associated disability in adults.