TL;DR
In a large-scale study of over 8,000 acute ischemic stroke patients in China, researchers found that staying in the hospital longer than 14 days did not improve long-term functional recovery. In fact, even after adjusting for stroke severity, prolonged stays were associated with a higher risk of poor functional outcomes at 3 and 12 months.
What Problem Does This Paper Address?
Hospital length of stay (LOS) is a critical metric for healthcare efficiency. In Western countries, the average stay for an acute ischemic stroke (AIS) is typically between 6 and 11 days. However, in China, the median stay is significantly longer—often around 14 days.
The rationale for longer stays is often to provide more intensive secondary prevention, patient education, and early rehabilitation. But does this extra time actually translate to better lives for patients? This paper investigates whether "prolonged" LOS (defined as >14 days) actually benefits functional outcomes or if it simply represents medical inefficiency or complications.
Methods
The researchers conducted a secondary analysis of the CASTOR study (Chinese Acute Ischemic Stroke Treatment Outcome Registry), a multicenter, prospective, hospital-based registry.
Key methodological features included:
- Dichotomization: Patients were split into "Normal LOS" (≤14 days) and "Prolonged LOS" (>14 days).
- Statistical Rigor: To account for the fact that sicker patients naturally stay in the hospital longer, the team used Generalized Estimation Equations (GEE) to handle hospital-level clustering and Propensity Score Matching (PSM) to create balanced cohorts for comparison.
- Outcome Measure: Functional outcome was measured using the modified Rankin Scale (mRS) at 3 and 12 months, with a "poor outcome" defined as a score of 3–6 (ranging from moderate disability to death).
Datasets
The study utilized the CASTOR registry, which encompasses:
- 80 hospitals across 46 cities in China.
- An initial pool of 10,002 patients, narrowed down to a final analytic cohort of 8,171 patients admitted within 3 days of stroke onset between 2015 and 2017.
- Exclusions included patients who received endovascular therapy, died during hospitalization, or had an "outlier" LOS exceeding 30 days.
Key Insights and Ideas
- The Insurance Paradox: One of the strongest predictors of a prolonged stay was having medical insurance (Adjusted OR 1.336). This suggests that financial coverage may inadvertently encourage longer hospitalizations that aren't necessarily driven by clinical necessity.
- Complications Drive Stay: Unsurprisingly, in-hospital infections (OR 2.412) and hemorrhagic events (OR 2.243) were massive drivers of prolonged LOS.
- Regional Variation: Geography matters. Patients in Central China were significantly more likely to have prolonged stays compared to those in Eastern China, highlighting disparities in hospital discharge policies or institutional cultures.
- The "Aha" Moment: Even when comparing patients with similar stroke severity and age via propensity matching, the "prolonged" group still fared worse. This suggests that the extra time in the acute hospital setting isn't a substitute for specialized post-acute rehabilitation.
Key Results
- Prevalence: Approximately 36.3% (2,968 patients) experienced a prolonged LOS (>14 days).
- Functional Outcomes at 3 Months: In the propensity-matched cohort, the risk of a poor outcome was 25.3% in the prolonged group versus 18.6% in the normal group (OR 1.480, 95% CI 1.285–1.704).
- Functional Outcomes at 12 Months: The trend persisted, with the prolonged group showing a significantly higher risk of poor outcomes (OR 1.617).
- Subgroup Consistency: These findings held true across different age groups and stroke severities (mild, moderate, and severe).
Limitations and Future Work
The authors acknowledge several limitations:
- Observational Nature: The study can show association but not direct causality. There is a risk of "reverse causality," where patients stay longer because they are not recovering well, rather than the stay causing the poor outcome.
- Missing Socioeconomic Data: Factors like income, education level, and specific discharge destinations (e.g., home vs. a dedicated rehab facility) were not available in the registry.
- Evolution of Care: The data is from 2015–2017 and excludes endovascular therapy (EVT). Given the rapid rise of EVT in China, its impact on LOS needs further study.
- Future Directions: The authors suggest that 14 days should be viewed as a "reasonable benchmark" for acute care in China, and future interventional studies should focus on whether actively transitioning patients to community-based rehab earlier can improve outcomes.