Myocardial triglycerides and systolic function in humans: in vivo evaluation by localized proton spectroscopy and cardiac imaging.
Recent experimental data suggest that adiposity directly damages the heart by promoting ectopic deposition of triglyceride, a process known as myocardial steatosis. The goal of this study was to develop and validate proton magnetic resonance spectroscopy ((1)H MRS) as an in vivo tool to measure myocardial lipid content. Complementary studies in rat tissue ex vivo and in 15 healthy humans in vivo provided evidence that (1)H MRS constitutes a reproducible technique for the measurement of myocardial triglyceride. In myocardial tissue from Zucker rats, the (1)H MRS measurement of triglyceride matched that obtained by biochemical measurement (P < 0.001). In human subjects triglyceride was evident in the hearts of even the very lean individuals and was elevated in overweight and obese subjects. Increased myocardial triglyceride content was accompanied by elevated LV mass and suppressed septal wall thickening as measured by cardiac imaging.
Szczepaniak
Lidia S
LS
Department of Internal Medicine, University of Texas, Southwestern Medical Center at Dallas, USA. lidia.szczepaniak@utsouthwestern.edu
Dobbins
Robert L
RL
Metzger
Gregory J
GJ
Sartoni-D'Ambrosia
Greta
G
Arbique
Debbie
D
Vongpatanasin
Wanpen
W
Unger
Roger
R
Victor
Ronald G
RG
D000818:Animals; D005260:Female; D006801:Humans; D015227:Lipid Peroxidation; D009682:Magnetic Resonance Spectroscopy; D008297:Male; D023421:Models, Animal; D009206:Myocardium / Q000378:metabolism*; D011522:Protons; D051381:Rats; D011924:Rats, Zucker; D015203:Reproducibility of Results; D013599:Systole / Q000502:physiology; D014280:Triglycerides / Q000378:metabolism*; D016277:Ventricular Function, Left / Q000502:physiology*
D011522:Protons; D014280:Triglycerides