Quantitative studies of human cardiac metabolism by 31P rotating-frame NMR.
We have developed 31P NMR spectroscopic methods to determine quantitatively relative levels of phosphorous-containing metabolites in the human myocardium. We have used localization techniques based on the rotating-frame imaging experiment and carried out with a double-surface coil probe. Information is obtained from selected slices by rotating-frame depth selection and from a complete one-dimensional spectroscopic image using phase-modulated rotating-frame imaging. The methods collect biochemical information from metabolites in human heart, and we use the fact that the phosphocreatine/ATP molar ratio in skeletal muscle at rest is higher than that in working heart to demonstrate that localization has been achieved for each investigation. The phosphocreatine/ATP molar ratio in normal human heart has been measured as 1.55 +/- 0.20 (mean +/- SD) (3.5-sec interpulse delay) in six subjects using depth selection and as 1.53 +/- 0.25 (mean +/- SD) in four subjects using spectroscopic imaging. Measurement of this ratio is expected to give a useful and reproducible index of myocardial energetics in normal and pathological states.
Blackledge
M J
MJ
Rajagopalan
B
B
Oberhaensli
R D
RD
Bolas
N M
NM
Styles
P
P
Radda
G K
GK
D000255:Adenosine Triphosphate / Q000378:metabolism; D004734:Energy Metabolism; D006801:Humans; D009682:Magnetic Resonance Spectroscopy / Q000379:methods; D009132:Muscles / Q000378:metabolism; D009206:Myocardium / Q000378:metabolism*; D010725:Phosphocreatine / Q000378:metabolism; D010758:Phosphorus
D010725:Phosphocreatine; D010758:Phosphorus; D000255:Adenosine Triphosphate