Altered coronary endothelial function in young smokers detected by magnetic resonance assessment of myocardial blood flow during the cold pressor test

作者：Ichikawa Yasutaka^*; Kitagawa Kakuya; Kato Shingo; Dohi Kaoru; Hirano Tadanori; Ito Masaaki; Sakuma Hajime

来源：International Journal of Cardiovascular Imaging, 2014, 30(S1): 73-80.

DOI：10.1007/s10554-014-0387-y

• Coronary endothelial function
• Myocardial blood flow
• Cold pressor test
• Magnetic resonance imaging
• Smoking

Endothelial dysfunction is a key element in early atherogenesis. The purposes of this study were to evaluate the feasibility of magnetic resonance (MR) assessment of altered myocardial blood flow (MBF) in response to the cold pressor test (CPT) and to determine if coronary endothelial dysfunction in young smokers can be detected with this noninvasive approach. Fourteen healthy non-smokers (31 +/- A 6 years) and 12 smokers (34 +/- A 8 years) were studied. Breath-hold phase-contrast cine MR imaging (PC-MRI) of the coronary sinus (CS) were obtained at rest and during the CPT. MBF was measured as CS flow divided by left ventricle mass and the rate pressure product. In non-smokers, MBF was 0.88 +/- A 0.19 ml/min/g at rest and significantly increased to 1.13 +/- A 0.26 ml/min/g during the CPT (P = 0.0001). In smokers, MBF was 0.94 +/- A 0.26 ml/min/g at rest and 0.96 +/- A 0.30 ml/min/g during the CPT (P = 0.73). Delta MBF (MBF during the CPT-MBF at rest) was significantly reduced in smokers compared with non-smokers (0.02 +/- A 0.20 vs. 0.26 +/- A 0.18 ml/min/g, P = 0.005). The intra-class correlation coefficient between measurements by two observers was 0.90 for Delta MBF. A significant reduction in MBF response to CPT was demonstrated in young smokers with PC-MRI at 1.5 T. This noninvasive method has great potential for assessment of coronary endothelial function.

• 出版日期2014-6