Assessing Microvascular Dysfunction in Angina With Unobstructed Coronary Arteries: JACC Review Topic of the Week

Area of Science:

• Cardiology
• Vascular Biology
• Diagnostic Imaging

Background:

• Coronary microvascular dysfunction is common in angina with nonobstructive coronary artery disease (ANOCA).
• Current diagnostic methods for microvascular function have limitations in assessing true coronary blood flow and resistance.
• Accurate assessment is crucial for prognosis and treatment of ANOCA patients.

Purpose of the Study:

• To review the pathophysiology and diagnostics of coronary microvascular dysfunction in ANOCA.
• To focus on the novel continuous thermodilution method for assessing absolute coronary flow (Q) and microvascular resistance (R).
• To discuss the integration and clinical impact of these novel measurements.

Main Methods:

• Review of existing literature on coronary microvascular dysfunction and its diagnostics.
• Detailed examination of the continuous thermodilution technique for intracoronary measurements.
• Analysis of the potential clinical integration of absolute flow and resistance measurements.

Main Results:

• Continuous thermodilution has demonstrated safety and feasibility for assessing absolute coronary flow (Q) and microvascular resistance (R) in ANOCA.
• This method overcomes limitations of current diagnostic modalities.
• Measurements of absolute Q and R provide a more comprehensive understanding of microvascular function.

Conclusions:

• Continuous thermodilution represents a significant advancement in diagnosing coronary microvascular dysfunction in ANOCA.
• Implementing absolute Q and R measurements can enhance patient understanding and treatment strategies.
• Further exploration and clinical integration of this method are warranted for improved cardiovascular care.