Aortic Stenosis Alters Heart Metabolism
Severe aortic stenosis stresses heart muscle through pressure overload daily. Cardiac energy pathways change but their link to outcomes stays unclear. Cardiologists need blood markers beyond echo and BNP. This study published in the Journal of Cardiology tests metabolism before and after valve replacement.
Comprehensive Testing Before and After Surgery
Researchers studied 143 symptomatic severe AS patients before aortic valve replacement. One year later, 113 returned for repeat testing. Everyone got cardiac MRI for mass and fibrosis plus serum biomarkers. Six-minute walk test measured function. Plasma underwent NMR spectroscopy for fatty acids, BCAAs, glycolysis metabolites, and ketones.
Low Metabolites Mark Worse Hearts
Lower fatty acid and BCAA levels tied to greater myocardial mass and focal fibrosis on CMR. These same low levels matched higher NT-proBNP and troponin T. Patients walked shorter 6-minute distances with reduced metabolites.
Death Risk Tracks Energy Starvation
Over 10.5 years follow-up, 66 of 143 patients died. Low fatty acids and BCAAs independently predicted higher mortality with p less than 0.05. Ketones and glycolysis metabolites showed no prognostic link.
AVR Fails to Restore Metabolism
One year post-AVR, fatty acid levels dropped further from baseline values. BCAAs stayed low too. Surgery fixes valve but not these maladaptive metabolic shifts.
Blood Tests Beat Imaging Alone
Fatty acids and BCAAs offer prognostic power beyond standard risk scores. Low levels flag high-risk AS patients preoperatively. Consider metabolic profiling for timing discussions.
Target Heart Energy Pathways
Future drugs might boost FA and BCAA use in AS hearts. Early AVR before metabolic collapse deserves testing. Simple NMR bloodwork guides decisions.
Risk Stratify Beyond Valve Area
Metabolic markers add value to echo gradients. Low FA/BCAAs demand closer monitoring pre and post AVR.
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Key highlights
- Study analyzed 143 severe symptomatic AS patients before AVR with repeat testing at 1 year in 113, using CMR, serum biomarkers, 6-minute walk test, and NMR metabolomics.
- Lower serum fatty acids and BCAAs correlated with greater myocardial mass, focal fibrosis, higher NT-proBNP, troponin T, and shorter 6-minute walk distance.
- During 10.5-year follow-up with 66/143 deaths, low fatty acids and BCAAs independently associated with higher mortality risk (p<0.05), unlike ketones or glycolysis metabolites.
- One-year post-AVR fatty acid concentrations decreased further compared to baseline, showing metabolic changes persist despite hemodynamic relief.
- Reduced FA and BCAA levels represent maladaptive prognostic markers in AS that may guide AVR timing and risk stratification beyond standard imaging.
Source
Nitsche C, Thornton GD, Bennett J, et al. Metabolic Markers of Mortality Risk in Patients With Severe Aortic Stenosis Undergoing Valve Replacement. The American Journal of Cardiology. 2025;261:1-7. doi: https://doi.org/10.1016/j.amjcard.2025.11.015
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Severe AS study shows low serum fatty acids and BCAAs link to higher myocardial mass, fibrosis, and mortality risk (p<0.05); levels drop further after AVR.
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