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Life sciences · Journal article
European Journal of Radiology Open · July 30, 2026
Encouraging direction, but not yet definitive.
This is a retrospective diagnostic accuracy study evaluating CCTA-derived left main cross-sectional area against IVUS-measured minimum lumen area in 45 Iranian patients. The study reports strong correlation (r=0.93) and high diagnostic accuracy (95.6%, AUC 0.94) at a proposed cut-off of 6.2 mm², but the authors explicitly state these are exploratory findings requiring validation in larger prospective cohorts before clinical implementation.
Retrospective cohort diagnostic accuracy study. 45 patients aged ≥18 years with diagnostic-quality CCTA and subsequent IVUS evaluation of the left main coronary artery within 90 days. Exclusion criteria: prior coronary artery bypass grafting, previous left main stent implantation, nondiagnostic CCTA image quality, uncontrolled atrial fibrillatio…. Intervention: CCTA measurement of left main cross-sectional area (LM-CSA) at narrowest segment. Compared with: IVUS measurement of minimum lumen area (MLA), using ≤6.0 mm² as threshold for functionally significant stenosis. n = 45. Single centre: Rajaie Cardiovascular Institute, Tehran, Iran.
CCTA-derived LM-CSA showed strong correlation with IVUS-derived MLA (r = 0.93, p < 0.001) IVUS-defined significant LMCA stenosis (MLA ≤6.0 mm²) present in 33.3% of patients (n=15/45) CT-derived LM-CSA cut-off of 6.2 mm² yielded 95.6% diagnostic accuracy and AUC 0.94 (95% CI: 0.86–1.00)
Study uses anatomical surrogate endpoint (IVUS-MLA) rather than clinical outcomes (revascularization deferral, adverse events, or symptom resolution).
While the reported diagnostic performance is high, the authors explicitly state these findings are exploratory and confined to an Iranian cohort. Clinicians should not adopt this cut-off for guiding deferral of invasive procedures without prospective multicentre validation. The study addresses a knowledge gap regarding ethnic-specific LMCA dimensions but requires external validation before implementation.
A single-centre diagnostic accuracy study in a small, ethnically specific cohort showing strong correlation and high diagnostic performance for a surrogate endpoint, requiring validation before clinical implementation.
As stated by the source record.
Quoted from the source exactly as published.
While the reported diagnostic performance is high, the authors explicitly state these findings are exploratory and confined to an Iranian cohort. Clinicians should not adopt this cut-off for guiding deferral of invasive procedures without prospective multicentre validation. The study addresses a knowledge gap regarding ethnic-specific LMCA dimensions but requires external validation before implementation.
Graded across the dimensions that decide whether you should act, each from what the source actually supports. There is no single score, and where a dimension was not assessed it says so.
Background. Assessment of Left Main Coronary Artery (LMCA) stenosis is critical due to its prognostic significance. LMCA cross-sectional area in Coronary Computed Tomography Angiography (CCTA) can provide a non-invasive alternative, but data on its correlation with IVUS remain limited, particularly in different ethnic groups. This study aimed to evaluate CT LM-CSA in determining significant left main stenosis compared to IVUS-MLA in Iranian patients.Methods. We included patients who underwent IVUS for LM stenosis evaluation and had CCTA performed within a maximum of 90 days before IVUS. LM-CSA measured at the narrowest segment on CCTA and MLA obtained via IVUS. Correlation assessed using Pearson's coefficient; agreement evaluated with Bland-Altman analysis. Receiver operating characteristic (ROC) analysis determined the optimal LM-CSA cut-off.Results. Forty-five patients were included (mean age 59.2 ± 10.1 years; 60% male). IVUS-defined significant LMCA stenosis (MLA <6.0 mm²) was present in 33.3% patients. Baseline characteristics were similar between groups. CCTA-derived LM-CSA showed a strong correlation with IVUS-derived MLA (r = 0.93, p < 0.001). A CT-derived LM-CSA cut-off of 6.2 mm² identified for predicting significant stenosis, yielding 95.6% diagnostic accuracy and an AUC of 0.94 (95% CI: 0.86-1.00), with sensitivity of 88.2% (95% CI: 63.6-98.5%), specificity of 100% (95% CI: 87.7-100%), positive predictive value of 100% (95% CI: 78.2-100%), and negative predictive value of 93.3% (95% CI: 77.9-99.2%).Conclusions. CCTA LM-CSA is a reliable non-invasive metric for LMCA stenosis assessment. The optimized cut-off provides a threshold derived in an Iranian cohort that requires further validation before it can be used to guide deferral of invasive procedures.
Taken from the source record, never inferred. Follow any of these and new work involving them reaches your briefing.