Longitudinal heterogeneity of coronary artery distensibility in plaques related to acute coronary syndrome.

Background: How coronary distensibility contributes to stable or unstable clinical manifestations remains obscure. We postulated that the heterogeneous plaque distensibility is associated with unstable clinical presentations in patients with acute coronary syndrome (ACS).

Methods And Results: Seventeen and 19 ACS-related and -unrelated lesions, respectively, were visualized using intravascular ultrasound imaging with simultaneous intracoronary pressure recording.

Endothelial dysfunction in paroxysmal atrial fibrillation as a prothrombotic state. Comparison with permanent/persistent atrial fibrillation.

Aim: Atrial fibrillation (AF), regardless of subtype, is associated with a prothrombotic state, which is related to endothelial dysfunction (ED).We hypothesized that paroxysmal atrial fibrillation (PAF) patients have endothelial dysfunction, and this may partially explain the high thromboembolic risk and poorer outcome in this category of patients.

Methods: The study population consisted of 100 consecutive outpatients with AF (mean age 65.