Preoperative osteosarcopenia predicts adverse outcomes in patients undergoing transcatheter aortic valve implantation.
Hirokazu Sugiura, Masahiro Takahashi, Yuki Sugawara and 1 others
Patients with both low muscle and low bone density before a heart valve procedure had a 3.98-fold higher risk of dying or being readmitted within a year.
Neither condition alone showed the same strength of association.
Key findings
1Osteosarcopenia (coexisting sarcopenia and osteopenia) was an independent predictor of the composite primary endpoint (all-cause mortality or unplanned hospitalization within one year), with a hazard ratio of 3.98 (95% CI 1.72–9.25) in univariate analysis and remaining significant across all five multivariate models adjusted for STS score plus NYHA class, GNRI, echocardiographic parameters, frailty scale, or walking speed.
2Event-free survival in the osteosarcopenia group was significantly lower than in both the sarcopenia-only group (p=0.024) and the osteopenia-only group (p=0.048), and the median event-free survival was 126 days in the osteosarcopenia group versus not reached in the non-osteosarcopenia group.
3Osteosarcopenia was assessed using the psoas muscle index and vertebral bone mineral density measured on the routine preoperative CT scan already obtained for TAVI planning, requiring no additional imaging or specialized equipment.
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What it does not show
Only 14 patients had osteosarcopenia. The authors' own power analysis said 146 per group would be needed for 80% power, so the study was substantially underpowered and the confidence intervals around the hazard ratio are wide. Single-centre, retrospective design. No causal inference is possible, and the authors explicitly state that the potential benefit of interventions targeting osteosarcopenia could not be confirmed. The cutoffs for defining sarcopenia and osteopenia were sex-specific tertiles within this one cohort. The PMI cutoffs (male 4.28, female 3.31 cm²/m²) were lower than previously proposed criteria for Asian adults (male 6.36, female 3.92), so the definition may not transfer to other populations. Patients who could not walk independently before TAVI were excluded. The authors note this introduces selection bias and that the findings apply to patients who maintain a baseline level of mobility. No baseline nutritional data were collected (daily protein intake, serum vitamin D), so the role of nutrition in the association is unknown. All patients received the same post-operative rehabilitation regardless of osteosarcopenia status, so the study cannot say whether a different or more intensive programme would have changed outcomes.
Declared interests
No external funding. The authors declare no conflicts of interest.
The easy way to misread this
Do not read this as evidence that treating muscle and bone loss before TAVI will improve outcomes. The study is observational, the osteosarcopenia group had only 14 patients, and every patient received the same post-operative rehabilitation regardless of their status. It shows that patients who already have both conditions do worse, not that fixing those conditions would change the result.
Summarised by AI from the full paper, without a clinician reviewing it. Check it against the source before it changes what you do. Read it on PubMed →