Prognostic Value of Endogenous-Type Coronary Microvascular Dysfunction After Elective Percutaneous Coronary...

Area of Science:

• Cardiology
• Cardiovascular Imaging
• Medical Diagnostics

Background:

• Coronary microvascular dysfunction (CMD) signifies impaired global coronary flow reserve (G-CFR) and is linked to poor prognosis.
• Endogenous-type CMD (E-CMD) presents with normal or mildly reduced hyperemic coronary flow and elevated resting flow, differentiating it from conventional CMD.
• Assessing the prognostic implications of post-percutaneous coronary intervention (PCI) CMD, with a specific focus on E-CMD, is crucial for understanding patient outcomes.

Purpose of the Study:

• To evaluate the prognostic value of post-PCI CMD, particularly E-CMD, in patients with chronic coronary syndrome (CCS).
• To determine if E-CMD independently predicts major adverse cardiac and cerebrovascular events (MACCE) in CCS patients following PCI.

Main Methods:

• A retrospective study included 320 CCS patients who underwent PCI.
• Cardiac magnetic resonance imaging (CMR) was used to assess G-CFR and resting myocardial flow.
• Patients were categorized based on post-PCI CMD status (G-CFR <2.0) and E-CMD classification, with MACCE tracked over a median of 2.5 years.

Main Results:

• Post-PCI CMD was present in 43.4% of patients, with E-CMD identified in 63.3% of those with CMD.
• MACCE occurred in 8.1% of patients, with a higher incidence in those with CMD (11.5%) compared to those without (5.5%).
• E-CMD was associated with significantly higher MACCE rates (14.8%) and independently predicted MACCE (HR 3.24; P=0.004).

Conclusions:

• Post-PCI CMD, especially E-CMD, is significantly associated with adverse outcomes in CCS patients.
• The identification of post-PCI CMD, including E-CMD, can inform therapeutic strategies for CCS patients.
• Further research into managing E-CMD post-PCI may improve long-term patient prognosis.