Daily Cardiology Research Analysis
Three impactful cardiology studies advance interventional strategy, risk prediction, and imaging-based surveillance. Imaging-guided PCI shows that meeting prespecified stent optimization criteria halves target vessel failure, a large CCTA study clarifies how plaque and hemodynamics forecast ACS within months to years, and a 70,389-person cohort refines when to repeat coronary calcium scans.
Summary
Three impactful cardiology studies advance interventional strategy, risk prediction, and imaging-based surveillance. Imaging-guided PCI shows that meeting prespecified stent optimization criteria halves target vessel failure, a large CCTA study clarifies how plaque and hemodynamics forecast ACS within months to years, and a 70,389-person cohort refines when to repeat coronary calcium scans.
Research Themes
- Imaging-guided PCI optimization and outcomes
- CT-based plaque, physiology, and time-to-ACS risk
- Population-based coronary calcium progression and rescanning intervals
Selected Articles
1. Proportion and Clinical Impact of Stent Optimization During Imaging-Guided Percutaneous Coronary Intervention: The OCTIVUS Trial.
In a 1,980-patient secondary analysis of the OCTIVUS trial, achieving prespecified stent optimization criteria during imaging-guided PCI was associated with a 48% relative reduction in target vessel failure over 2 years. The benefit appeared more pronounced with OCT guidance than IVUS, although no significant interaction was detected.
Impact: Provides actionable quality targets for imaging-guided PCI that correlate with hard outcomes, supporting optimization checklists as a modifiable determinant of success.
Clinical Implications: Adopting prespecified optimization criteria during OCT/IVUS-guided PCI can reduce TVF. Operators should systematically verify expansion, apposition, and complication criteria, with OCT potentially offering stronger benefit for optimization-driven outcomes.
Key Findings
- Stent optimization was achieved in 51.6% of imaging-guided PCI procedures.
- Target vessel failure at 2 years was 3.8% with optimization vs 7.5% without (HR 0.52, 95% CI 0.35–0.77).
- Optimization benefit appeared larger with OCT guidance (HR 0.39) than IVUS (HR 0.63), without significant interaction.
Methodological Strengths
- Large sample size with adjudicated outcomes and 2-year follow-up
- Predefined optimization criteria applied uniformly across OCT/IVUS arms
Limitations
- Secondary analysis; not randomized by optimization status
- Differences in optimization rates between OCT and IVUS may reflect device/operator factors
Future Directions: Prospective trials testing optimization checklists and OCT vs IVUS strategies powered for clinical endpoints; AI-assisted intra-procedural decision support to achieve optimization.
BACKGROUND: Data regarding the proportion and clinical impact of achieving stent optimization by intravascular ultrasound (IVUS)- or optical coherence tomography (OCT)-guided percutaneous coronary intervention (PCI) remain limited. OBJECTIVES: The authors assessed the proportion and cardiovascular outcomes in patients with and without stent optimization using imaging guidance. METHODS: This secondary analysis of the OCTIVUS (Optical Coherence Tomography-Guided or Intravascular Ultrasound-Guided Percutaneous Coronary Intervention) trial classified patients into optimized (meeting all prespecified optimization criteria) or nonoptimized groups. The primary endpoint was target vessel failure (TVF), a composite of cardiac death, target vessel myocardial infarction, or ischemia-driven target vessel revascularization. RESULTS: Among 1,980 patients, 1,022 (51.6%) achieved stent optimization, with a lower proportion in the OCT-guided group than in the IVUS-guided group (467 of 967 [48.3%] vs 555 of 1,013 [54.8%]; P = 0.004). At a median follow-up of 2.0 years, TVF incidence was lower in the optimized group than in the nonoptimized group (39 of 1022 [3.8%] vs 72 of 958 [7.5%]; HR: 0.52; 95% CI: 0.35-0.77; P < 0.001). The effect of stent optimization on TVF appeared more substantial in OCT-guided PCI (14 of 467 [3.0%] vs 38 of 500 [7.6%]; HR: 0.39; 95% CI: 0.21-0.72) than in IVUS-guided PCI (25 of 555 [4.5%] vs 34 of 458 [7.4%]; HR: 0.63; 95% CI: 0.37-1.05), albeit there was no significant interaction between TVF and imaging modalities (P for interaction = 0.30). CONCLUSIONS: Stent optimization was achieved in approximately one-half of patients undergoing imaging-guided PCI and was associated with a better clinical outcome. This effect appeared more pronounced in OCT-guided than in IVUS-guided PCI. (Optical Coherence Tomography Versus Intravascular Ultrasound Guided Percutaneous Coronary Intervention [OCTIVUS]; NCT03394079).
2. Prognostic Time Frame of Plaque and Hemodynamic Characteristics and Integrative Risk Prediction for Acute Coronary Syndrome.
In 351 patients who developed ACS within 1 month to 3 years after CCTA, culprit lesions with greater stenosis, plaque burden, and ΔFFR were linked to shorter time-to-ACS. Integrating anatomic and physiologic domains improved prognostic discrimination for imminent events.
Impact: Defines a clinically meaningful time horizon linking CCTA plaque/physiology features with near-term ACS, supporting integrated risk models to triage surveillance and preventive therapy.
Clinical Implications: Patients with high stenosis, high plaque burden, and large ΔFFR on CCTA may warrant intensified preventive strategies and closer follow-up in the first months after imaging.
Key Findings
- Shorter test-to-ACS time was associated with higher luminal stenosis, greater plaque burden, and larger ΔFFR in culprit lesions.
- Baseline risk factors were similar across short-, mid-, and long-time-to-event groups, highlighting lesion characteristics as key drivers.
- Integrative modeling of anatomic (stenosis, plaque burden, APC) and physiologic (ΔFFR) domains improved prognostic stratification.
Methodological Strengths
- Core-lab CCTA analysis with lesion-level classification against invasive angiography at ACS
- Multidomain assessment (anatomy and physiology) enabling integrative risk modeling
Limitations
- Abstract truncation limits detailed reporting of ΔFFR thresholds and statistical metrics
- Observational design; potential imaging selection bias
Future Directions: Prospective validation of integrative CCTA-physiology scores to guide intensified prevention; interventional trials targeting high-risk lesions identified by combined domains.
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 (ΔFFR 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 ΔFFR CONCLUSIONS: Increased luminal stenosis, plaque burden, and ΔFFR
3. Coronary artery calcification distribution and progression in over 70 000 asymptomatic individuals: implications for assessment intervals and optimal testing age.
In 70,389 asymptomatic adults with serial CAC, most had CAC=0 at baseline; only 1% with baseline 0 progressed to CAC>100 within 5–6 years and ~4% within 10 years. These data support lengthening rescanning intervals in low-risk individuals, particularly younger and female subgroups.
Impact: Provides robust real-world evidence to inform CAC rescanning intervals, potentially reducing unnecessary radiation and cost while maintaining safety in low-risk populations.
Clinical Implications: For asymptomatic individuals with CAC=0, especially younger adults and women, repeat CAC scanning can be deferred for at least 5–6 years; only a small minority exceed CAC>100 by 10 years.
Key Findings
- At baseline, 84% had CAC=0 and 3% had CAC>100; 93% of women had CAC=0.
- Among those with baseline CAC=0, incident CAC occurred in 16% within 5–6 years, but only 1% exceeded CAC>100.
- After 10 years, only ~4% progressed to CAC>100, supporting longer rescanning intervals.
Methodological Strengths
- Very large cohort with repeated CAC measures over up to a decade
- Age- and sex-stratified analyses enhancing applicability
Limitations
- Retrospective design in a predominantly male Korean cohort (87% men), limiting generalizability
- Potential selection bias from health-screening participants
Future Directions: Prospective validation across diverse populations; cost-effectiveness modeling of personalized CAC rescanning strategies by age/sex/risk.
AIMS: To assess the prevalence and progression of CAC in asymptomatic individuals and evaluate the duration for which a CAC score of 0 persists over time. METHODS AND RESULTS: This retrospective cohort study included 70 389 asymptomatic individuals aged over 30 years from Korea, with at least two CAC score assessments (2010-22). Subgroups were defined based on follow-up intervals: the entire cohort, those with at least four assessments within 10 years, and those with follow-up after five years. Analyses focused on age- and sex-specific CAC distributions, incidence and timing of new CAC, and changes in CAC scores among those with an initial score of 0 over 6-12 years. Among participants (mean age 40.5 ± 6.6 years; 87% men), 84% had a baseline CAC score of 0, and 3% had scores > 100. Notably, 93% of women had a CAC score of 0, with the highest percentages observed in younger women. Incident CAC developed in 16% of participants with an initial score of 0 within five to six years, with just 1% exceeding score of 100. Extended follow-up data showed a consistently low prevalence of significant CAC scores, with only 4% exceeding scores > 100 after 10 years. CONCLUSION: In a large Korean cohort of over 70 000 asymptomatic adults, most had baseline CAC = 0, indicating low subclinical atherosclerosis. Significant calcification (CAC > 100) was rare within 5-6 years, with only 4% exceeding 100 by 10 years, even among older subgroups.