Abstract Body (Do not enter title and authors here): Purpose: This study examined whether online CME could improve the knowledge and confidence of cardiologists regarding the use of echocardiography for HCM diagnosis and management.

Methods: The CME intervention comprised of a series of 6 online interviews between 1 moderator and 2 expert faculty. Educational effect was assessed using a repeated-pair design with pre-/post-assessment. 3 multiple choice questions assessed knowledge, and 1, rated on a Likert-type scale, assessed confidence. A paired samples t-test was conducted on overall average number of correct responses and for confidence rating, and a McNemar’s test was conducted at the question level (significance level, P< .05). Data were collected August 8-September 8, 2023.

Results: 165 cardiologists answered all assessment questions during the study period. Analysis of pre- vs. post-intervention responses demonstrated a significant improvement in overall knowledge; average correct responses increased from 48% pre-assessment to 74% post-assessment (P<.001). Specific areas of improvement include: Knowledge of the quantification of LVOT gradients, MR, and LVEF in the echocardiographic workup of HCM: 21% improved and 62% reinforced; the correct response increased (P<.001) from 65% (pre) to 84% (post). Knowledge of the utility of echocardiography for follow-up and monitoring response to HCM treatment: 48% improved and 35% reinforced; the correct response increase (P<.001) from 39% (pre) to 70% (post).

Post-education, 48% of cardiologists had a measurable increase in their ability to diagnose HCM using echocardiographic parameters, resulting in 43% who were mostly or very confident after education (24% pre vs 43% post; P<.001).

Conclusion: This study demonstrated the success of online CME at improving the knowledge and confidence of cardiologists related to the use of echocardiography to identify and manage HCM.