祖父江 嘉洋

BACKGROUND: The relevant time frame for predicting future acute coronary syndrome (ACS) based on coronary lesion characteristics remains uncertain. OBJECTIVES: The aim of this study was to investigate the association of lesion characteristics with test-to-event time and their prognostic impact on ACS. METHODS: The EMERALD II (Exploring the Mechanism of Plaque Rupture in Acute Coronary Syndrome Using Coronary CT Angiography and Computational Fluid Dynamics II) study analyzed 351 patients who underwent coronary computed tomography angiography (CTA) and experienced ACS between 1 month and 3 years of follow-up. Lesions identified on coronary CTA were classified as culprit (n = 363) or nonculprit (n = 2,088) on the basis of invasive coronary angiography findings at the time of ACS. Core laboratory coronary CTA analyses assessed 4 domains: degree of stenosis, plaque burden, number of adverse plaque characteristics (APC) (low-attenuation plaque, positive remodeling, spotty calcification, and napkin-ring sign), and changes in coronary CTA-derived fractional flow reserve across the lesion (ΔFFRCT). Patients were categorized into short (<1 year), mid (1-2 years), and long (2-3 years) test-to-event time groups. RESULTS: Patient characteristics, including cardiovascular risk factors, did not differ across short, mid, and long test-to-event groups (P > 0.05 for all), and the proportion of ACS culprit lesions was similar (P = 0.552). Among culprit lesions, shorter test-to-event time was associated with higher luminal stenosis, plaque burden, and ΔFFRCT (P for trend < 0.001 for all). The predictability for ACS culprit lesions based on the combined 4 characteristics tended to decrease over time and significantly reduced beyond 2 years (AUC: 0.851 vs 0.741; P = 0.006). In predicting ACS risk within test-to-event time <2 years using obstructive lesions (stenosis ≥ 50%), APC ≥2, plaque burden ≥70%, and ΔFFRCT ≥0.10, the risk was elevated compared to the average proportion of lesions becoming ACS culprit (12.1%) in the following subsets: lesions with 4 characteristics (proportion of lesions becoming ACS culprit: 49.3%; P < 0.001), lesions with 3 characteristics (obstructive lesions with plaque burden ≥70% and either ΔFFRCT ≥0.10 [proportion of lesions becoming ACS culprit: 33.0%; P < 0.001] or APC ≥2 [proportion of lesions becoming ACS culprit: 31.2%; P < 0.001]), and lesions with 2 characteristics (plaque burden ≥70% and ΔFFRCT ≥0.10; proportion of lesions becoming ACS culprit: 21.5%; P = 0.016). CONCLUSIONS: Increased luminal stenosis, plaque burden, and ΔFFRCT were associated with shorter test-to-ACS event time. The prognostic impact of lumen, plaque, and local hemodynamic characteristics was most relevant to ACS risk within a 2-year period, with higher risk observed when specific combinations of them were present. (Exploring the Mechanism of Plaque Rupture in Acute Coronary Syndrome Using Coronary CT Angiography and Computational Fluid Dynamics II [EMERALD II] Study; NCT03591328).

OBJECTIVE: This study highlights a case in which we performed a complex percutaneous coronary intervention on a 60-mm chronic total occlusion lesion with a remarkably low radiation dose by using the SPOT region of interest (SPOT ROI) function available on the Alphenix Evolve Edition X-ray system (Canon Medical Systems). KEY STEPS: Fluoroscopy was conducted exclusively using SPOT ROI from the start of guiding catheter engagement. The wire successfully traversed the chronic total occlusion lesion with SPOT ROI. Despite a fluoroscopy time of 71 min, the total radiation dose was kept at 990 mGy, remaining <1 Gy. POTENTIAL PITFALLS: The SPOT ROI function is only available on the Alphenix Evolve Edition X-ray system and cannot be used with other X-ray equipment. TAKE-HOME MESSAGE: This case suggests that SPOT ROI can be leveraged to safely reduce radiation during complex percutaneous coronary intervention.