Introduction: Patients commonly use YouTube for education, and this may have increased due to COVID-19 related restrictions on access to healthcare professionals. However, YouTube videos lack peer review and regulation. To assess patient education in the COVID-19 era, we analyzed the quality of YouTube videos on coronary artery bypass graft (CABG) surgery. Methods: We searched YouTube using the phrase "coronary artery bypass graft." Two authors individually used the Journal of the American Medical Association (JAMA), DISCERN, and Health on the Net (HON) systems, to rate the first 50 videos retrieved. Data collected for each video included; number of views, duration since upload, percentage positivity (proportion of likes relative to total likes plus dislikes), number of comments, and video author. Interobserver reliability was assessed using an intraclass correlation coefficient (ICC). Associations between video characteristics and quality were tested using linear regression or t-tests. Results: The average number of views was 575,571. Average quality was poor, with mean scores of 1.93/4 (ICC 0.54) for JAMA criteria, 2.52/5 (ICC 0.78) for DISCERN criteria, and 4.04/8 (ICC 0.66) for HON criteria. Videos uploaded by surgeons scored highest overall (p < .05). No other factors demonstrated significant association with video quality. Conclusion: YouTube videos on CABG surgery are of poor quality and may be inadequate for patient education. Given the complexity of the procedure and that beyond the COVID-19 era, patients are more likely to seek education from digital sources, treating surgeons should advise of YouTube's limitations and direct patients to reliable sources of information.