Coronary obstruction following transcatheter aortic valve replacement. Risk evaluation and preventive strategies

Coronary obstruction (CO) is a rare but potentially fatal complication of transcatheter aortic valve implantation (TAVI). The present article aims to summarize the evidence on CO risk factors and provide an overview of preventive strategies. We performed a comprehensive literature review focused on these items. The analysis included studies addressing patient-specific characteristics, procedural aspects, and the effectiveness of various prevention techniques in mitigating CO risk. Specific risk factors for CO, which can be assessed by evaluating patient characteristics using computed tomography, are described. Procedural factors associated with an increased risk of CO are discussed. Preventive techniques, including the chimney stent and bioprosthetic aortic scallop intentional laceration to prevent iatrogenic coronary artery obstruction (BASILICA), are also described, highlighting the advantages and disadvantages of each method. The present review also provides an overview of emerging dedicated devices designed to address this complication. In conclusion, identifying patients at risk for CO is crucial for optimizing TAVI outcomes. Comprehensive imaging assessment and appropriate preventive strategies, such as the BASILICA technique, can mitigate the risk of CO and improve patient outcomes. Further research is needed to validate emerging dedicated devices.