Premium
Cardiac metabolism measured noninvasively by hyperpolarized 13 C MRI
Author(s) -
Golman Klaes,
Petersson J. Stefan,
Magnusson Peter,
Johansson Edvin,
Åkeson Per,
Chai ChunMing,
Hansson Georg,
Månsson Sven
Publication year - 2008
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.21460
Subject(s) - alanine , hyperpolarization (physics) , chemistry , bicarbonate , nuclear medicine , metabolism , nuclear magnetic resonance , medicine , nuclear magnetic resonance spectroscopy , biochemistry , amino acid , physics , organic chemistry
Pyruvate is included in the energy production of the heart muscle and is metabolized into lactate, alanine, and CO 2 in equilibrium with HCO 3 − . The aim of this study was to evaluate the feasibility of using 13 C hyperpolarization enhanced MRI to monitor pyruvate metabolism in the heart during an ischemic episode. The left circumflex artery of pigs (4 months, male, 29–34 kg) was occluded for 15 or 45 min followed by 2 hr of reperfusion. Pigs were examined by 13 C chemical shift imaging following intravenous injection of 1‐ 13 C pyruvate. 13 C chemical shift MR imaging was used in order to visualize the local concentrations of the metabolites. After a 15‐min occlusion (no infarct) the bicarbonate signal level in the affected area was reduced (25–44%) compared with the normal myocardium. Alanine signal level was normal. After a 45‐min occlusion (infarction) the bicarbonate signal was almost absent (0.2–11%) and the alanine signal was reduced (27–51%). Due to image‐folding artifacts the data obtained for lactate were inconclusive. These studies demonstrate that cardiac metabolic imaging with hyperpolarized 1‐ 13 C‐pyruvate is feasible. The changes in concentrations of the metabolites within a minute after injection can be detected and metabolic maps constructed. Magn Reson Med 59:1005–1013, 2008. © 2008 Wiley‐Liss, Inc.