Coronary flow reserve in angiographically normal coronary arteries with one-vessel coronary artery disease without...

Area of Science:

• Cardiology
• Cardiovascular Physiology
• Medical Imaging

Background:

• Reduced coronary flow reserve is linked to traditional risk factors, even with normal coronary arteries.
• Traditional risk factors do not explain all cases of coronary atherosclerosis.
• Investigating coronary flow reserve in patients without traditional risk factors is crucial.

Purpose of the Study:

• To assess coronary flow reserve in myocardial regions supplied by normal coronary arteries.
• To evaluate patients with one-vessel coronary artery disease but without traditional risk factors.
• To compare findings with control groups.

Main Methods:

• Positron emission tomography (PET) using [13N]ammonia was employed.
• Measurements were taken at baseline and after dipyridamole infusion.
• Coronary flow reserve was calculated as the ratio of hyperemic to baseline myocardial blood flow.

Main Results:

• Coronary flow reserve was significantly lower in patients with risk factors compared to age-matched controls (1.62±0.37 vs. 2.58±0.71, P=0.0428).
• Coronary flow reserve in patients without risk factors was similar to age-matched controls (2.54±0.17 vs. 2.58±0.71, P=ns).
• PET imaging revealed preserved myocardial blood flow in the territories of normal coronary arteries in patients without traditional risk factors.

Conclusions:

• Coronary flow reserve is preserved in myocardial regions supplied by angiographically normal coronary arteries.
• This preservation is observed in patients with one-vessel coronary artery disease who lack traditional risk factors.
• Findings highlight the importance of assessing coronary flow reserve independently of traditional risk factors.