News|Articles|July 29, 2026

Frailty May Signal Elevated Risk of Cognitive Impairment in CKD

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Key Takeaways

Frailty in CKD was associated with significantly higher odds of cognitive impairment (OR 3.13), and the signal persisted after sensitivity analyses excluding extreme effects and MMSE-based studies.
Prefrailty also demonstrated elevated odds of cognitive impairment (OR 2.70), indicating cognitive vulnerability may emerge before overt frailty.
Heterogeneity was high (I² 93.98%), with geographic region, frailty tool selection, and covariate adjustment identified as key moderators.
Regional and methodological factors influenced magnitude, with stronger associations in Asian cohorts and higher pooled ORs using non-Fried instruments versus Fried Frailty Phenotype.
Bidirectional prevalence overlap was ~42%, underscoring a sizable CKD subgroup with concurrent frailty and cognitive impairment, and highlighting the need for prospective, confounder-adjusted studies.

The meta-analysis of 17 studies found that frailty was strongly associated with cognitive impairment in CKD, highlighting the need for further research to determine a causal relationship.

Patients with chronic kidney disease (CKD) who were frail had more than 3-fold higher odds of cognitive impairment than those who were physically robust, according to a systematic review and meta-analysis published in the Journal of Nursing Scholarship, reinforcing the potential of frailty screening to detect cognitive decline earlier in this population.¹

Mixed Evidence Spurs Further Research

CKD affects approximately 9.5% of the global population, and frailty is one of its most common comorbidities.² Cognitive impairment is also widespread among patients with CKD, with prevalence estimates reaching 40%¹; it tends to worsen as kidney disease advances. Because cognitive decline in this population is linked to poor medication adherence, low health literacy, and higher mortality, investigators emphasized that understanding what drives it has direct implications for care management.

Previous studies examining the association between frailty and cognitive dysfunction in patients with CKD have produced inconsistent findings, prompting the current systematic review and meta-analysis. The researchers searched 6 databases through February 2026 and identified 17 eligible studies, comprising 129,868 patients with CKD across the Americas, Asia, and Europe.

Meta-Analysis Reveals Strong Overlap Between Frailty, Cognitive Impairment in CKD

Across the 17 studies, frail patients with CKD had significantly higher odds of cognitive impairment than those who were physically robust (OR, 3.13; 95% CI, 1.92-5.12), amounting to a 213% increase in risk. The association remained significant after excluding the study with the largest effect size and removing studies that relied on the Mini-Mental State Examination, which has well-reported limitations.

Patients with prefrailty also had substantially elevated odds (OR, 2.70; 95% CI, 1.64-4.45) compared with those without frailty, indicating a 170% increase. Heterogeneity across studies was high (I² = 93.98%), with moderator analyses identifying 3 significant sources of variation: geographic region, the frailty measurement tool used, and whether studies adjusted for covariates.

The association between frailty and cognitive impairment in patients with CKD was notably stronger in studies conducted in Asia (pooled OR, 5.67) than in the Americas or Europe combined (pooled OR, 2.32). In addition, studies that used the Fried Frailty Phenotype, the most widely used frailty tool, reported comparatively lower odds than those using other instruments such as the Clinical Frailty Index or FRAIL scale (pooled ORs, 2.38 vs 5.50). Of the 17 studies analyzed, only 2 adjusted for covariates, which reported a markedly smaller association (OR, 1.35) than unadjusted studies (OR, 3.69), a gap the authors flagged as a priority for future research.

Beyond ORs, the analysis found substantial overlap between frailty and cognitive impairment prevalence. Among patients with CKD and cognitive impairment, the pooled prevalence of frailty was 42.7%. Similarly, the pooled prevalence of cognitive impairment was 42% among patients with CKD and frailty. The investigators noted that both figures point to a sizable subgroup of patients managing both conditions simultaneously, with implications for care coordination and caregiver burden.

Future Research Needed to Establish Causal Relationship

The researchers acknowledged their study’s limitations, one being that most included studies were cross-sectional, which prevented them from establishing a causal relationship between frailty and cognitive impairment in patients with CKD. In addition, only 2 studies accounted for confounding factors, which may have led to residual confounding, highlighting the need for future prospective studies with more comprehensive analyses.

“Our findings evidence the importance of screening and managing frailty to prevent cognitive impairment in patients with CKD,” the authors concluded. “Additionally, prospective cohort studies should be implemented to assess the causal relationship between frailty and cognitive impairment.”

References

Bui HT, Apriliyasari RW, Bui QHQ, Tsai PS. Association between frailty and cognitive impairment in chronic kidney disease: a systematic review and meta-analysis. J Nurs Scholarsh. 2026;58(4):e70110. doi:10.1111/jnu.70110
Hoogendijk EO, Afilalo J, Ensrud KE, Kowal P, Onder G, Fried LP. Frailty: implications for clinical practice and public health. Lancet. 2019;394(10206):1365-1375. doi:10.1016/S0140-6736(19)31786-6