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Pre-admission frailty and functional dependency are associated with higher all-cause mortality in ICU patientsFrailty and physical dependence increase risk for ICU patients

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Key Takeaway
Note that pre-admission frailty and functional dependency are associated with higher mortality in ICU patients.

This meta-analysis synthesized 55 observational studies to evaluate the impact of pre-admission functional status, specifically frailty and functional dependency, on outcomes in acutely admitted adult ICU patients. The analysis included 21 studies specifically contributing to the meta-analysis components.

Findings indicated that non-frail patients had a risk ratio of 0.62 for all-cause mortality (95% CI [0.58-0.67], P<0.01) compared to frail patients. Additionally, independent patients showed a risk ratio of 0.47 for all-cause mortality (95% CI [0.40-0.54], P<0.01) compared to dependent patients. These results suggest that pre-admission frailty and functional dependency are associated with higher mortality following ICU admission.

The authors noted substantial statistical and clinical heterogeneity across the included studies. Consequently, the overall certainty of evidence is very low. Clinicians should interpret these findings with caution, as the true effect could differ substantially from the estimates provided due to the low certainty of evidence and the observational nature of the source data.

When a patient is admitted to the intensive care unit, their past physical health often tells a story about their future. New data from 55 observational studies shows that patients who were already frail or had trouble with daily tasks before entering the ICU faced a significantly higher risk of death.

Specifically, the data shows that patients who were not frail had a much lower risk of death compared to those who were. Similarly, patients who were independent in their daily lives had a lower risk of death than those who were dependent. These findings highlight how much a person's baseline strength matters during a medical crisis.

While these results are clear, the evidence is not yet solid. Because the data came from many different types of studies, the researchers noted that the certainty of these findings is very low. This means while the link between frailty and higher risk is visible, the exact scale of the impact could vary significantly.

What this means for you:
Patients who are frail or physically dependent before ICU admission face a higher risk of death.

Common questions

How does frailty affect a patient's chance of survival in the ICU?

Patients who were not frail before entering the ICU had a much lower risk of death compared to those who were frail. The data shows a risk ratio of 0.62 for non-frail patients, meaning those who were physically stronger before their crisis had better outcomes.

Does being physically dependent before a hospital stay impact outcomes?

Yes, the data shows that patients who were independent before admission had a lower risk of death than those who were dependent. The risk ratio for independent patients was 0.47, showing that being able to perform daily tasks independently is linked to better survival.

How certain are these findings regarding ICU patients?

The researchers noted that the certainty of this evidence is very low. Because the data came from many different types of studies, the actual impact of frailty could differ significantly from the estimates provided in the report.

Study Details

Study typeMeta analysis
EvidenceLevel 1
PublishedNov 2026
View Original Abstract ↓
BACKGROUND: Pre-admission functional status might be associated with mortality in critically ill patients admitted to the ICU. With this systematic review, we aimed to investigate the association of pre-admission functional domains with mortality after ICU admission and which functional measures were used. METHODS: We searched PubMed, Embase, and the Cochrane Register of Controlled Trials for studies of acutely admitted adult ICU patients reporting pre-admission functional status and mortality. Exploratory outcomes were mechanical ventilation, renal replacement therapy, delirium, ICU and hospital length of stay, discharge destination, and health-related quality of life. Screening, data extraction, and risk-of-bias evaluation were performed in duplicate. Certainty of evidence was assessed using Grading of Recommendations Assessment, Development, and Evaluation. RESULTS: Of the 55 observational studies included, 21 contributed to the meta-analyses. Overall, 26.7% of the participants were deceased at variable follow-up (ICU to 1 yr). Frailty prevalence ranged from 3.6% to 76.8%, and functional dependency from 10.6% to 68.7%. Meta-analysis showed a risk ratio (RR) of 0.62 (95% confidence interval [CI] 0.58-0.67, P<0.01) for all-cause mortality between non-frail and frail participants and an RR of 0.47 (95% CI 0.40-0.54, P<0.01) between independent and dependent participants. No statistically significant association was found in the subgroup analysis of exploratory outcomes. Statistical and clinical heterogeneity were substantial, and overall certainty of evidence was very low. CONCLUSIONS: Pre-admission frailty and functional dependency were associated with higher mortality after ICU admission. Overall, the evidence is very uncertain, and the true effect could differ substantially from our estimates.
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