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Updated: Jul 27, 2025
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Acetylcholine Re-Challenge After Intracoronary Nitroglycerine Administration
Published on: April 4, 2022
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Post-spastic flow recovery time to document vasospasm induced ischemia during acetylcholine provocation testing
Rutger G T Feenstra1, Janneke Woudstra1, Isa Bijloo1
1Amsterdam UMC, Heart Centre, Department of Cardiology, Amsterdam Cardiovascular Sciences, Amsterdam, the Netherlands.
Summary
Intracoronary acetylcholine (ACh) provocation can induce post-spastic reactive hyperemia (PSRH), indicated by prolonged flow-recovery time. This finding suggests myocardial ischemia in patients with equivocal ACh test results, potentially benefiting from treatment.
Area of Science:
- Cardiology
- Diagnostic Imaging
- Physiology
Background:
- Intracoronary acetylcholine (ACh) provocation is standard for diagnosing epicardial and microvascular vasospasm.
- ACh-induced vasospasm is hypothesized to cause post-spastic reactive hyperemia (PSRH), measurable as extended flow-recovery time.
Purpose of the Study:
- To evaluate flow-recovery time as an indicator of ischemia in different diagnostic endotypes following ACh provocation testing.
- To assess the clinical significance of flow-recovery time in patients undergoing ACh provocation for coronary vasospasm.
Main Methods:
- Analysis of patients with angina and non-obstructive coronary artery disease undergoing ACh provocation testing.
- Continuous Doppler flow measurement to determine flow-recovery time from ACh infusion cessation to flow restoration.
Main Results:
- Conventional testing diagnosed vasospasm in 63%, equivocal results in 22%, and negative results in 15% of patients.
- Flow-recovery time was significantly prolonged in epicardial, microvascular, and equivocal vasospasm groups compared to the negative group (p < 0.001), indicating PSRH.
- Equivocal results showed flow-recovery times similar to vasospasm, suggesting myocardial ischemia.
Conclusions:
- Prolonged flow-recovery time in equivocal ACh provocation tests indicates myocardial ischemia.
- Patients with equivocal results may benefit from targeted medical treatment for vasospasm.
- Flow-recovery time is a valuable metric for assessing ischemia in ACh provocation testing.
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