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Coronary Sinus Narrowing Improves Coronary Microcirculation Function in Patients With Refractory Angina: A
Matteo Tebaldi1, Gianluca Campo2, Fabrizio Ugo3
1Cardiology Unit, Ospedale degli Infermi, Faenza (RA), Italy (M.T.).
Circulation. Cardiovascular Interventions
|January 16, 2024
Summary
Coronary sinus narrowing via reducer implantation significantly improved coronary microcirculation and reduced angina symptoms in patients with refractory angina. This intervention enhances microvascular function, offering new therapeutic insights.
Area of Science:
- Cardiology
- Vascular Biology
- Medical Devices
Background:
- Mechanisms of clinical benefits from coronary sinus narrowing are not fully understood.
- Investigating the impact of coronary sinus narrowing on coronary microcirculatory function.
Purpose of the Study:
- To evaluate the effect of coronary sinus narrowing on coronary microcirculatory function indexes.
- To assess changes in microcirculatory resistance, coronary flow reserve, and resistive resistance ratio.
Main Methods:
- Invasive physiological assessments in patients with refractory angina before and 4 months after coronary sinus reducer implantation.
- Primary outcome: change in index of microcirculatory resistance (IMR).
- Secondary outcomes: changes in coronary flow reserve (CFR) and resistive resistance ratio (RRR).
Main Results:
- IMR significantly decreased post-procedure (33.35±19.88 to 15.42±11.36, P<0.001).
- 71.4% of patients showed a significant IMR reduction; abnormal IMR decreased from 57% to 19%.
- Coronary flow reserve and resistive resistance ratio improved; angina symptoms (CCS class, SAQ score) also improved.
Conclusions:
- Coronary sinus reduction implantation significantly improves coronary microcirculatory function parameters.
- Findings suggest potential for treating coronary microvascular dysfunction and improving angina.
- The study provides insights into the benefits of coronary sinus narrowing for angina relief.
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