Cardiac metabolism in patients with dilated and hypertrophic cardiomyopathy: assessment with proton-decoupled P-31 MR spectroscopy.
Proton-decoupled phosphorus-31 heart spectroscopy was performed in healthy subjects (n = 9) and patients with dilated cardiomyopathy (DCM, n = 9) or hypertrophic cardiomyopathy (HCM, n = 8). The phosphocreatine (PCr)-to-adenosine triphosphate ratio (+/- one standard deviation) after correction for blood contribution and partial saturation was significantly lower in HCM patients relative to the control subjects (1.32 +/- 0.29 vs 1.65 +/- 0.26, P < .05) but not in DCM patients (1.52 +/- 0.58 vs 1.65 +/- 0.26). The inorganic phosphate (Pi) peak was resolved only in patients with the highest spectral quality. Myocardial pH was lower in HCM patients (n = 6) relative to control subjects (n = 4) (7.07 +/- 0.07 vs 7.15 +/- 0.03, P < .05). The Pi/PCr ratio was higher in DCM (n = 3) and HCM (n = 6) patients relative to control subjects (n = 4) (0.29 +/- 0.06 and 0.20 +/- 0.04, respectively, vs 0.14 +/- 0.06; P < .05). Elevated phosphodiester signal in DCM patients correlated with 2,3-diphosphoglycerate signal (r = .94), reflecting blood pool contamination. P-31 spectroscopy enabled detection of abnormalities in cardiac metabolism and determination of pH in patients with HCM and DCM.
de Roos
A
A
Department of Diagnostic Radiology, University Hospital Leiden, The Netherlands.
Doornbos
J
J
Luyten
P R
PR
Oosterwaal
L J
LJ
van der Wall
E E
EE
den Hollander
J A
JA
D000255:Adenosine Triphosphate / Q000378:metabolism; D000328:Adult; D002311:Cardiomyopathy, Dilated / Q000378:metabolism*; D002312:Cardiomyopathy, Hypertrophic / Q000378:metabolism*; D004163:Diphosphoglyceric Acids / Q000378:metabolism; D005260:Female; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D008875:Middle Aged; D009206:Myocardium / Q000378:metabolism*; D010710:Phosphates / Q000378:metabolism; D010725:Phosphocreatine / Q000378:metabolism; D012016:Reference Values
D004163:Diphosphoglyceric Acids; D010710:Phosphates; D010725:Phosphocreatine; D000255:Adenosine Triphosphate