Abstract

Expeditious transfer of patients with acute ischemic stroke (AIS) and LVO presenting to a primary stroke center (PSC) and within the window for mechanical thrombectomy (MT) is vital to optimize their functional outcome. Door-in-door-out (DIDO) represents the time of patient arrival to the PSC to the time of discharge from the PSC for transfer to a comprehensive stroke center (CSC). The goal for this metric is 90 minutes. At a large urban academic and CSC with a high volume of patient transfers, we examined our DIDO metrics to identify trends and opportunities for improvement. Methods: The CSC MT database was queried to analyze DIDO times. Inclusion criteria included AIS cases with LVO transferred to the CSC for MT from fiscal year 2022-2023. Hospitals transferring less than 5 cases during that timeframe, inpatient cases, and unavailable times were excluded. Hospital DIDO times and their components (i.e. each step in the process) were grouped into quartiles and analyzed. A survey to PSC stakeholders was sent to identify themes for possible barriers. Results: Among 8 hospitals, the top quartile with the fastest DIDO times had a mean of 132 minutes and median of 122 (N = 22 patients). The hospitals with the longest DIDO had a mean of 205 and a median of 193 (N=17). The components of DIDO times that separated the fastest from the slowest were PSC arrival to 1 st call to CSC and 1 st call of PSC to acceptance at CSC . The PSCs with the highest DIDOs took double the time in these components (40 vs 81, 22 vs 53 minutes). Distance from the CSC does not appear to be a factor in DIDO times, with the fastest being 13 to 68 miles away vs. 11 to 30 miles for the slowest. In the survey results, 81% of participants had CSC bed availability as the top barrier, whereas 69% reported delays in transport time to PSC. Conclusion: DIDO times from PSCs continues to be an opportunity for process improvement. Only 5% in our sample met the DIDO metric goal of 90 minutes. Two areas of potential improvement include decreasing PSC time to 1 st call and improving time of CSC acceptance. PSCs believe that a “ready” bed at the CSC would decrease DIDO times, but there are additional opportunities among the components.

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