Abstract
Background: Mechanical thrombectomy (MT) has been proven to be a successful treatment option for patients with acute ischemic stroke (AIS) in numerous randomized controlled trials. The majority of trials underrepresent patients aged 70 and above, and there is little contemporary data on regional trends and variation in mortality. Methods: This retrospective study using the National Inpatient Sample (2016-2019) seeks to identify any regional relationships between geriatric patients' in-hospital mortality after MT for AIS at urban facilities and trends in inpatient mortality. Regional Inpatient mortality based on sex and race and trends between 2016 and 2019 were assessed. Results: Our study group consisted of 52455 AIS-MT admissions (median 78 yrs, 57.1% male, 77.2% white, 89.6% Medicare enrollees) with a 14.1% inpatient mortality rate. Despite having a lower comparative burden of traditional CVD risk factors, the hospitals from the Northeast had a higher inpatient mortality rate (17.2%, n=1650) and risk (adjusted OR:1.25, 95% CI:1.03-1.51) than the other regions. Similar trends were observed in male (18.1%), females (16.6%), white (17.3%) and black (13.8%) participants (P<0.001) undergoing AIS-MT. Highest inpatient mortality among Hispanics was linked to Midwest-based participants (16.2%) without regional variation in rates for Asians. There were declining trends in mortality between 2016 to 2019 in West region without any change in other regions (from 14.0% to 11.5%, ptrend=0.002) (Fig. 1) . Conclusion: Among demographically comparable geriatric patients with AIS undergoing MT in the US, the Northeast region admissions showed the highest inpatient mortality even after controlling for confounding factors with a relatively lower burden of CVD risk factors. This disparity warrants further research to validate these findings.
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