Effects of aortic tortuosity on left ventricular diastolic parameters derived from gated myocardial perfusion single photon emission computed tomography in patients with normal myocardial perfusion.

Abstract

Aortic tortuosity is often found on chest radiograph, especially in aged patients. We tested the hypothesis that aortic tortuosity was associated with LV diastolic parameters derived from gated SPECT in patients with normal myocardial perfusion. One-hundred and twenty-two patients with preserved LV ejection fraction and normal myocardial perfusion were enrolled. Descending aortic deviation was defined as the horizontal distance from the left line of the aortic knob to the most prominent left line of the descending aorta. This parameter was measured for the quantitative assessment of aortic tortuosity. Peak filling rate (PFR) and one-third mean filling rate (1/3 MFR) were obtained from redistribution images as LV diastolic parameters. Descending aortic deviation ranged from 0 to 22mm with a mean distance of 4.5±6.3mm. Descending aortic deviation was significantly correlated with age (r=0.38, p<0.001) and estimated glomerular filtration rate (eGFR) (r=-0.21, p=0.02). Multivariate linear regression analysis revealed that eGFR (β=0.23, p=0.02) and descending aortic deviation (β=-0.23, p=0.01) were significantly associated with PFR, and that only descending aortic deviation (β=-0.21, p=0.03) was significantly associated with 1/3 MFR. Our data suggest that aortic tortuosity is associated with LV diastolic parameters derived from gated SPECT in patients with normal myocardial perfusion.