Abstract
Purpose
Smoking cessation has been shown to normalize the coronary endothelial dysfunction in healthy young smokers. However, its effect has not been explored in middle-aged smokers with a longer history of smoking. Therefore, we compared the effects of smoking cessation on coronary vasomotor response between both young and middle-aged smokers and identified the predictor for its improvement.
Methods
This study investigated 14 young healthy smokers (age 25.2 ± 2.3 years), 13 middle-aged smokers (age 42.0 ± 6.5 years) and 10 non-smokers. Myocardial blood flow (MBF) was measured by using 15O-water positron emission tomography (PET).
Results
At baseline, the ratio of MBF during the cold pressor test (CPT) to that at rest (MBFCPT/rest), the index of coronary endothelial function, was significantly decreased in both young and middle-aged smokers compared to non-smokers (1.24 ± 0.20 and 1.10 ± 0.39 vs 1.53 ± 0.18, p < 0.05 and p < 0.001, respectively). The ratio of MBF during adenosine triphosphate infusion to that at rest was significantly decreased in middle-aged smokers compared to young smokers and non-smokers (3.34 ± 1.52 vs 4.43 ± 0.92 and 4.69 ± 1.25, p < 0.05, respectively). MBFCPT/rest at 1 month after smoking cessation significantly increased in young smokers, but not in middle-aged smokers. By multivariate analysis, baseline serum malondialdehyde-modified low-density lipoprotein (MDA-LDL) was an independent predictor for the changes in MBFCPT/rest after smoking cessation (β = –0.45, p < 0.05).
Conclusion
Coronary endothelial dysfunction was reversible by short-term smoking cessation in young smokers, but not in middle-aged smokers, which was associated with serum MDA-LDL levels. Long-term smoking exposure could lead to more advanced coronary endothelial dysfunction and atherosclerosis possibly via oxidative stress.
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Abbreviations
- ATP:
-
Adenosine triphosphate
- BP:
-
Blood pressure
- CPT:
-
Cold pressor test
- HDL:
-
High-density lipoprotein
- LDL:
-
Low-density lipoprotein
- MBF:
-
Myocardial blood flow
- MBFATP/rest :
-
Ratio of myocardial blood flow during adenosine triphosphate infusion to that at rest
- MBFCPT/rest :
-
Ratio of myocardial blood flow during the cold pressor test to that at rest
- MDA:
-
Malondialdehyde
- PET:
-
Positron emission tomography
- RPP:
-
Rate-pressure product
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Acknowledgement
This study was supported in part by the Grants-in-Aid for Young Scientists (20790871) from the Ministry of Education, Culture, Sports, Science and Technology, Japan (MN), in part by The Mochida Memorial Foundation for Medical and Pharmaceutical Research, Japan (MN), and in part by the Smoking Research Foundation, Japan (NT).
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Naya, M., Morita, K., Yoshinaga, K. et al. Long-term smoking causes more advanced coronary endothelial dysfunction in middle-aged smokers compared to young smokers. Eur J Nucl Med Mol Imaging 38, 491–498 (2011). https://doi.org/10.1007/s00259-010-1647-2
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DOI: https://doi.org/10.1007/s00259-010-1647-2