Impact of Iron Deficiency and Its Correction on Mitochondrial Metabolism of the Cardiomyocyte (MitoCardioFer)

Myocardial biopsy (after opening cardiac cavities under general anesthesia for valvular surgery) for mitochondrial metabolism analyses.

Sternal bone marrow biopsy (after sternal opening under general anesthesia for valvular surgery) for the quantification of iron stores

blood sample (under general anesthesia for valvular surgery, using the arterial catheter already in place) for hepcidin quantification (hormone not dosed in the usual martial assessment)