Hypoalbuminemia partly mediates the impact of frailty on poor outcomes in stroke patients, with mediation proportions of 22.21%, 16.85%, and 14.03% at discharge, 30 days, and 90 days, respectively.
Key Findings
Results
Frailty was prevalent in nearly 30% of stroke patients and was significantly associated with hypoalbuminemia after adjusting for confounding factors.
52 of 175 stroke patients (29.71%) were classified as frail (CFS ≥ 5) within 24 hours of admission.
Frailty was associated with hypoalbuminemia with RR = 1.61 (95% CI: 1.08–2.40, p = 0.019) after adjustment for confounders.
Frailty was assessed using the Clinical Frailty Scale (CFS) within 24 hours of admission.
Hypoalbuminemia was defined as serum albumin < 35 g/L based on the lowest level during hospitalisation.
Results
Hypoalbuminemia developed in more than one-third of stroke patients during hospitalisation.
64 of 175 patients (36.57%) developed hypoalbuminemia during hospitalisation.
Hypoalbuminemia was determined based on the lowest serum albumin level recorded during the hospital stay.
The study included patients admitted to a tertiary hospital between March and November 2023.
Results
Poor functional outcomes were common at discharge, 30 days, and 90 days post-discharge, declining over time.
Poor outcomes (mRS > 3) occurred in 47.43% of patients at discharge, 42.86% at 30 days, and 37.14% at 90 days.
Functional outcomes were evaluated using the modified Rankin Scale (mRS), with scores ≤ 3 defined as good outcome and > 3 as poor outcome.
Follow-up assessments were conducted at three time points: discharge, 30 days, and 90 days after discharge.
Results
Frailty was independently and significantly associated with poor functional outcomes at all three time points, with the association strengthening over time.
At discharge: RR = 1.56 (95% CI: 1.12–2.16, p = 0.008).
At 30 days: RR = 2.02 (95% CI: 1.41–2.89, p < 0.001).
At 90 days: RR = 2.79 (95% CI: 1.81–4.30, p < 0.001).
All associations were adjusted for confounding factors.
Results
Hypoalbuminemia was independently associated with poor functional outcomes at all three assessment time points.
Hypoalbuminemia was significantly associated with poor outcomes at discharge, 30 days, and 90 days (all p < 0.05).
The association remained significant after adjusting for confounding factors.
Specific RR values for hypoalbuminemia and poor outcomes at each time point were not individually enumerated in the abstract but were described as independently significant.
Results
Hypoalbuminemia partially mediated the relationship between frailty and poor stroke outcomes at all three time points, with the mediation proportion decreasing over time.
Mediation proportion at discharge: 22.21% (p < 0.05).
Mediation proportion at 30 days: 16.85% (p < 0.05).
Mediation proportion at 90 days: 14.03% (p < 0.05).
The mediation was described as partial, indicating that frailty also affects poor outcomes through pathways other than hypoalbuminemia.
All mediation proportions were statistically significant (all p < 0.05).
Methods
The study was a prospective cohort conducted in a single tertiary hospital, limiting generalizability.
175 stroke patients were enrolled between March and November 2023.
The study followed STROBE guidelines for reporting observational studies.
No patient or public contribution was noted.
The single-center design and relatively short enrollment period may limit the representativeness of findings.
What This Means
This research suggests that in stroke patients, being frail (having reduced physical and physiological reserves) increases the likelihood of having low blood protein levels (hypoalbuminemia) during hospitalization, and that both conditions independently worsen functional recovery. Among 175 stroke patients admitted to a hospital in 2023, nearly 30% were considered frail and over 36% developed low albumin levels during their stay. Frail patients were significantly more likely to have poor functional outcomes—meaning they needed more help with daily activities—both at hospital discharge and at follow-up visits 30 and 90 days later, with the gap between frail and non-frail patients widening over time.
Importantly, the study found that low albumin levels (hypoalbuminemia) partially explained—or 'mediated'—why frailty leads to worse outcomes. Specifically, hypoalbuminemia accounted for about 22% of the effect of frailty on poor outcomes at discharge, dropping to about 17% at 30 days and 14% at 90 days. This means that while low albumin is one mechanism linking frailty to poor recovery, other biological or clinical pathways are also involved.
These findings have practical implications for hospital nursing care. This research suggests that routinely screening stroke patients for frailty upon admission and monitoring their blood albumin levels throughout their hospital stay could help identify patients at high risk for poor recovery. Early detection might enable healthcare teams to intervene with nutritional support or targeted care strategies to improve outcomes for these vulnerable patients.
Yang J, Li F, Zhang X, Peng J, Li J, Zhou S, et al.. (2026). The Mediating Role of Hypoalbuminemia in the Association Between Frailty and Poor Outcomes in Stroke Patients.. Nursing open. https://doi.org/10.1002/nop2.70763