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Background. The purpose of this work was to further define the value of cardiac 31 P magnetic resonance (MR) spectroscopy for patients with coronary artery disease and dilated cardiomyopathy. Methods and Results. Blood-corrected and 31 T 1 -corrected 31 P MR spectra of anteroseptal myocardium were obtained at rest using image-selected in vivo spectroscopy localization, a selected volume of 85±12 cm 3 , and a field strength of 1.5 T. Nineteen volunteers had a creatine phosphate (CP)/ATP ratio of 1.95±0.45 (mean±SD) and a PDE/ATP ratio of 1.06±0.53; in four patients with left anterior descending coronary artery (LAD) stenosis, six patients with chronic anterior wall infarction, and four patients with chronic posterior wall infarction, CP/ATP and phosphodiester (PDE)/ATP ratios did not differ from those in volunteers. Twenty-five measurements of 19 patients with dilated cardiomyopathy yielded a CP/ATP of 1.78±0.51 and a PDE/ATP of 0.98±0.56 (p=NS versus volunteers). When these patients were grouped according to the severity of heart failure, however, CP/ATP was 1.94±0.43 in mild (p=NS versus volunteers) and 1.44±0.52 in severe DCM (p < 0.05), respectively. No correlation was found between CP/ATP and left ventricular ejection fraction or fractional shortening, but correlation of CP/ATP with the New York Heart Association (NYHA) class was significant (r=0.60, p < 0.005). Six patients with dilated cardiomyopathy were studied repeatedly before and after 12±6 weeks of drug treatment leading to clinical recompensation with improvement of the NYHA status by 0.8±0.3 classes. Concomitantly, CP/ATP increased from 1.51±0.32 to 2.15±0.27 (p < 0.01), whereas PDE/ATP did not change significantly. Conclusions. Cardiac high-energy phosphate metabolism at rest is normal in LAD stenosis and chronic myocardial infarction in the absence of heart failure. The CP/ATP ratio has low specificity for the diagnosis of dilated cardiomyopathy. However, CP/ATP correlated with the clinical severity of heart failure and may improve during clinical recompensation.

Type

Journal article

Journal

Circulation

Publication Date

01/12/1992

Volume

86

Pages

1810 - 1818