Abstract 1122‐000140: National Trends in Readmission after Mechanical Thrombectomy in Acute Ischemic Stroke

Introduction : Mechanical thrombectomy (MT) has become the standard of care in patients with large vessel occlusion after trials have demonstrated (MT) improved outcomes in acute ischemic stroke (AIS) as compared to medical therapy. Despite leading to high reperfusion rates, MT patients are at high risk for recurrent ischemic events and complications of stroke. We performed an analysis to evaluate temporal trends in readmission of post‐MT among stroke patients over a three‐year period. Methods : From the Healthcare Cost and Utilization Project Nationwide Readmission Database, we obtained in‐hospital adult patient data with a principal diagnosis of AIS in the US from 2016 to 2018. AIS, MT, thrombolysis treatment and other diagnosis were identified based on International Classification of Diseases, 10th Revision, Clinical Modification codes. We compared the trend of 30‐day readmission in AIS patients who received MT, thrombolysis only and neither treatment with linear regression. Using Clinical Classifications Software Refined tool, we categorized the readmission principal diagnoses of patients underwent MT into groups. All analyses were performed in Stata/SE 15.1 software. Results : Of the 1,271,958 patients admitted from throughout the US with AIS within the study period, 1,130,737 (88.90%) did not receive thrombolysis nor MT, 100,737 (7.92%) received thrombolysis only, and 40,849 (3.21%) underwent MT with or without thrombolysis. The endovascular treatment rate doubled from 2016 (2.40%) to 2018 (4.11%, p < 0.0001). From 2016 to 2018, the readmission rate has significantly decreased from 15.00% to 12.04% (absolute risk reduction (ARR) 2.96%, p = 0.0001) in patients who underwent MT, decreased from 10.46% to 9.51% (ARR 0.95%, p = 0.0097) in patients who received thrombolysis only, and decreased from 11.96% to 11.56% (ARR 0.40%, p = 0.0130) in patients received neither therapy. Among all the patients who underwent MT during the three‐year period, sepsis (1.88%), cerebral infarction (1.59%), sequelae of cerebral infarction (0.82%), cardiac dysrhythmias (0.67%) and heart failure (0.49%) were the most common principal readmission diagnoses. From 2016 to 2018, there were significant decreases in rate of readmissions with septic infection (p = 0.0001), sequelae of cerebral infarction (p < 0.0001), and heart failure (p = 0.0123), but no significant change in cerebral infarction (p = 0.4853) and cardiac dysrhythmias (p = 0.1834). Conclusions : Over three years, the rate of readmissions in AIS patients receiving MT significantly declined, particularly in rate of readmissions in sepsis, sequelae of cerebral infarction, and heart failure. Improved reperfusion rate and better outcomes may explain the reduction in post‐MT complication rate, which needs further studies.