Related Experiment Videos
Coronary vasomotor response to acetylcholine late after angioplasty
H Nishijima1, H Meno, H Higashi
1Division of Internal Medicine, Hamanomachi General Hospital, Fukuoka, Japan.
Insights
Percutaneous transluminal coronary angioplasty (PTCA) segments without restenosis show no increased reaction to acetylcholine. However, non-PTCA segments exhibit hypercontractility, suggesting PTCA alters coronary vasomotion.
Area of Science:
- Cardiovascular Medicine
- Interventional Cardiology
- Pharmacology
Background:
- Coronary vasomotion is crucial for regulating blood flow.
- Percutaneous transluminal coronary angioplasty (PTCA) is a common intervention for coronary artery disease.
- Understanding post-PTCA vascular function is essential for patient outcomes.
Purpose of the Study:
- To investigate the changes in coronary vasomotion in balloon-dilated segments.
- To compare the vasoconstricting response to acetylcholine in PTCA-treated and untreated coronary segments.
Main Methods:
- Acetylcholine was administered cumulatively (10-100 micrograms) into coronary arteries of 15 patients.
- Evaluated vasoconstriction in previously balloon-dilated (PTCA) and non-dilated segments.
- Coronary spasm was defined as >75% reduction in diameter post-isosorbide dinitrate.
Main Results:
- PTCA segments without restenosis showed minimal dose-dependent constriction to acetylcholine (1/15 patients).
- Non-PTCA segments exhibited significant dose-dependent vasoconstriction (12/15 patients).
- Coronary spasm occurred in 7% of PTCA segments vs. 34% of non-PTCA segments (p < 0.005).
Conclusions:
- PTCA segments free of restenosis do not display hyper-reactivity to acetylcholine.
- Non-PTCA segments demonstrate hypercontractility, indicating altered vasomotor response.
- Coronary balloon angioplasty may modify coronary vasomotor reactions to acetylcholine months post-procedure.
Abstract:
To elucidate the changes in coronary vasomotion in a previously balloon-dilated segment, we examined the vasoconstricting response of previously balloon-dilated and non-dilated segments to acetylcholine. Acetylcholine was administered into coronary arteries cumulatively (left and right coronary artery: 10-100 micrograms) in 15 patients (age: 60 +/- 3 years, 12 males and 3 females) at 7.4 +/- 1.5 months after successful percutaneous transluminal coronary angioplasty (PTCA). In PTCA segments with no restenosis, does-dependent constriction in response to acetylcholine was observed in only 1 patient. In non-PTCA segments of PTCA and non-PTCA arteries, 12 patients showed dose-dependent vasoconstriction in response to acetylcholine. Coronary spasm, which was defined as a more than 75% reduction in coronary diameter compared with that after isosorbide dinitrate, was provoked in one PTCA segment (7%). In non-PTCA segments of PTCA and non-PTCA arteries, 15 of 44 arteries (34%) demonstrated coronary spasm in 9 of 15 patients (60%, p < 0.005 vs PTCA segment). In conclusion, PTCA segments free of restenosis showed no hyper-reactivity to acetylcholine, while non-PTCA segments showed hypercontractility in response to acetylcholine. Coronary balloon angioplasty may alter the coronary vasomotor reaction to acetylcholine several months after angioplasty.