Cardiac Microanatomy Imaging Using Forward-viewing Optical Coherence Tomography Endoscope

Comprehensive Summary

This study investigates the use of forward-viewing optical coherence tomography (OCT) endoscopy to visualize cardiac structures associated with arrhythmogenic risks. Researchers developed a scanning endoscopic OCT probe and tested it on excised ovine hearts with chronic myocardial infarction. With the device, researchers imaged subendocardial regions to identify structures such as Purkinje fibers, scar tissue, and adipose tissue. The findings were confirmed through Masson’s trichrome staining. The OCT imaging data were used to also train a convolutional neural network to automatically detect and reconstruct Purkinje fibers in 3D. The probe was found to be successful in distinguishing healthy and fibrotic tissue and clearly visualizing elements of the cardia conduction system. This successful application demonstrated the OCT’s ability to capture detailed features within the heart.

Outcomes and Implications

This research is important because current cardiac imaging techniques, such as MRIs and ultrasounds, cannot detect the subtle microstructural changes that often precede sudden cardiac death. The use of OCT endoscopy offers a potential breakthrough in visualizing the Purkinje network and fibrotic remodeling, which can be critical in preventing fatal arrhythmias. However, this study requires further validation in vivo to be enabled in clinical implementation.