Patti, Giuseppe

Abstract Background and Aims A simple diagnostic method able to reliably exclude left main (LM) coronary artery disease (CAD) or LMCAD-equivalent would expand implementation of an initial non-invasive strategy in patients with chronic coronary syndrome (CCS). This study assessed the diagnostic utility of an approach using clinical and ECG stress testing (EST) variables in excluding LMCAD/LMCAD-equivalent in CCS patients. Methods In a multicentre case-control study, CCS patients undergoing invasive coronary angiography (CAG) after a maximal EST were evaluated. Cases were patients with angiographic ≥ 50% LM stenosis or ≥70% stenosis of both proximal left anterior descending and proximal circumflex arteries, matched with similar patients without them (controls) in a 1:3 ratio. A risk model developed through logistic regression was internally and externally validated. Results Three hundred and thirty-five cases were matched with 797 controls. The model area under the curve (AUC) was .78. Assuming LMCAD prevalence of 5% and a misclassification cost ratio of 1:100 (ratio of cost of performing CAG in a control to cost of not performing CAG in a case), negative predictive value was 98.2%. Thus, CAG could be safely avoided in 41% of patients, missing one LMCAD/LMCAD-equivalent diagnosis for every 58 CAGs safely spared in patients without them. Conclusions Among CCS patients, LMCAD/LMCAD-equivalent can be excluded with high negative predictive value through a model based on clinical and EST parameters, allowing initial non-invasive management of most patients able to exercise. This approach is potentially useful particularly in communities where access to computed tomography coronary angiography is limited.

Abstract Myocardial bridging is the most common congenital coronary anomaly, characterized by an intramyocardial course of a segment of an epicardial coronary artery, with considerable variability in its depth and length. In most cases, MB is a benign anatomical variant without clinical significance, often asymptomatic and not requiring treatment. However, with the increasing use of coronary computed tomography angiography for coronary assessment, myocardial bridging is now more frequently identified during non-invasive imaging. It can also be diagnosed via invasive coronary angiography, where it appears as a dynamic systolic compression of the tunnelled artery segment, and further anatomical characterization can be enhanced by intravascular ultrasound or optical coherence tomography. Growing recognition of myocardial bridging’s role in ischaemia with non-obstructive coronary arteries has heightened clinical interest in its prevalence, diagnostic strategies, and management approaches. As such, this narrative review provides clinicians with an updated, evidence-based guide to the diagnosis and therapeutic management of myocardial bridging, while also addressing ongoing controversies and areas of uncertainty.