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Regional quantification of cardiac metabolism with hyperpolarized [1-13C]-pyruvate CMR evaluated in an oral glucose challenge.
- Source :
- Journal of Cardiovascular Magnetic Resonance (Elsevier B.V. ); 12/12/2023, Vol. 25 Issue 1, p1-13, 13p
- Publication Year :
- 2023
-
Abstract
- Background: The heart has metabolic flexibility, which is influenced by fed/fasting states, and pathologies such as myocardial ischemia and hypertrophic cardiomyopathy (HCM). Hyperpolarized (HP) <superscript>13</superscript>C-pyruvate MRI is a promising new tool for non-invasive quantification of myocardial glycolytic and Krebs cycle flux. However, human studies of HP <superscript>13</superscript>C-MRI have yet to demonstrate regional quantification of metabolism, which is important in regional ischemia and HCM patients with asymmetric septal/apical hypertrophy. Methods: We developed and applied methods for whole-heart imaging of <superscript>13</superscript>C-pyruvate, <superscript>13</superscript>C-lactate and <superscript>13</superscript>C-bicarbonate, following intravenous administration of [1-<superscript>13</superscript>C]-pyruvate. The image acquisition used an autonomous scanning method including bolus tracking, real-time magnetic field calibrations and metabolite-specific imaging. For quantification of metabolism, we evaluated <superscript>13</superscript>C metabolite images, ratio metrics, and pharmacokinetic modeling to provide measurements of myocardial lactate dehydrogenase (LDH) and pyruvate dehydrogenase (PDH) mediated metabolic conversion in 5 healthy volunteers (fasting & 30 min following oral glucose load). Results: We demonstrate whole heart coverage for dynamic measurement of pyruvate-to-lactate conversion via LDH and pyruvate-to-bicarbonate conversion via PDH at a resolution of 6 × 6 × 21 mm<superscript>3</superscript> (<superscript>13</superscript>C-pyruvate) and 12 × 12 × 21 mm<superscript>3</superscript> (<superscript>13</superscript>C-lactate, <superscript>13</superscript>C-bicarbonate). <superscript>13</superscript>C-pyruvate and <superscript>13</superscript>C-lactate were detected simultaneously in the RV blood pool, immediately after intravenous injection, reflecting LDH activity in blood. In healthy volunteers, myocardial <superscript>13</superscript>C-pyruvate-SNR, <superscript>13</superscript>C-lactate-SNR, <superscript>13</superscript>C-bicarbonate-SNR, <superscript>13</superscript>C-lactate/pyruvate ratio, <superscript>13</superscript>C-pyruvate-to-lactate conversion rate, k<subscript>PL</subscript>, and <superscript>13</superscript>C-pyruvate-to-bicarbonate conversion rate, k<subscript>PB</subscript>, all had statistically significant increases following oral glucose challenge. k<subscript>PB</subscript>, reflecting PDH activity and pyruvate entering the Krebs Cycle, had the highest correlation with blood glucose levels and was statistically significant. Conclusions: We demonstrate first-in-human regional quantifications of cardiac metabolism by HP <superscript>13</superscript>C-pyruvate MRI that aims to reflect LDH and PDH activity. [ABSTRACT FROM AUTHOR]
- Subjects :
- BLOOD sugar analysis
HEART metabolism
FASTING
ENERGY metabolism
RESEARCH
INTRAVENOUS therapy
CALIBRATION
ORAL drug administration
MYOCARDIAL ischemia
CARDIAC hypertrophy
MAGNETIC resonance imaging
COMPARATIVE studies
LACTATE dehydrogenase
RESEARCH funding
CARBOXYLIC acids
DESCRIPTIVE statistics
BICARBONATE ions
LACTATES
GLUCOSE tolerance tests
OXIDOREDUCTASES
GLUCOSE
STATISTICAL correlation
GLYCOLYSIS
METABOLITES
APICAL hypertrophic cardiomyopathy
Subjects
Details
- Language :
- English
- ISSN :
- 1532429X
- Volume :
- 25
- Issue :
- 1
- Database :
- Complementary Index
- Journal :
- Journal of Cardiovascular Magnetic Resonance (Elsevier B.V. )
- Publication Type :
- Academic Journal
- Accession number :
- 174206818
- Full Text :
- https://doi.org/10.1186/s12968-023-00972-7