Nuclear Magnetic Resonance Spectroscopy of Rat Ventricles Following Supravalvar Aortic Banding

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Abstract
Left ventricular hypertrophy produced by supravalvar aortic banding infant rats was studied by proton magnetic resonance spectroscopy. Weight gain at 11 weeks of age in the 11 male Sprague-Dawley rats with aortic bands placed at three weeks was similar to that of the 14 controls. The left ventricle of banded rats hypertrophied, increasing the ratio of left ventricle plus septum to body weight (LV+S/BW) by more than 50% (P < .00001). Right ventricular weight (RV/BW) increased slightly (P < .03). T1 and T2 relaxation times of LV+S, RV, and high muscle (Th) from the banded and control rats were compared. The T2 value distinguished hypertrophied from control LV+S (P < .003), but not between RV or Th from the two groups. For banded rats only, the T2 value distinguished each muscle type: LV+S from RV, LV+S from Th, and RV from Th (P < .00001 for each). For control rats, cardiac muscle was distinguished from Th (P < .00001), but LV+S and RV were similar. The T1 value did not distinguish either the banded from the control group or any of the muscle types. Percent water content was similar for all tissues. Any correlation between water content and T1 or T2 was inconsistent or weak.