No studies have demonstrated medium- or long-term skill retention of cardiac point-of-care ultrasound (POCUS) curriculum for medical student. Based on the American Society of Echocardiography (ASE) curriculum framework, we developed a blended-learning cardiac POCUS curriculum with competency evaluation. The objective of this study was to investigate the curriculum impact on image acquisition skill retention 8 weeks after initial training. This study was a prospective, pre-post education intervention study for first- and second-year medical students, with blinded outcome assessment. The curriculum included a pre-training ASE online module and healthy volunteer hands-on training to obtain 5 views: parasternal long-axis (PLAX), parasternal short-axis (PSAX), apical 4-chamber (A4C), subcostal 4-chamber (S4C), and subcostal inferior vena cava (SIVC) views. Students took 5-view image acquisition skill tests at pre-, immediate post-, and 8-week post-training, using a healthy volunteer. Three blinded assessors rated the image quality using a validated 10-point maximum scoring system. Students used a hand-held ultrasound probe (Butterfly iQ). Fifty-four students completed hands-on training, and pre- and immediate post-training skill tests. Twenty-seven students completed 8-week post-training skill tests. Skill test score improvement between pre- and 8-week post-training was 2.11 points (95% CI, 1.22–3.00; effect size, 1.13). The cardiac POCUS curriculum demonstrated medium-term skill retention. The curriculum was sufficient for S4C and SIVC skill retention, but inadequate for PLAX, PSAX, and A4C. Therefore, instructional design modifications or re-training for PLAX, PSAX, and A4C are needed to make the curriculum more effective for clinically relevant skill retention.

中文翻译：

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基于美国超声心动图学会课程框架的医学生在心脏床旁超声培训后的中期技能保留

没有研究表明医学生心脏床旁超声 (POCUS) 课程的中期或长期技能保留。基于美国超声心动图学会 (ASE) 课程框架，我们开发了具有能力评估的混合学习心脏 POCUS 课程。本研究的目的是调查初始培训后 8 周课程对图像采集技能保留的影响。这项研究是一项针对一年级和二年级医学生的前瞻性、学前教育干预研究，采用盲法结果评估。课程包括培训前 ASE 在线模块和健康志愿者动手培训以获得 5 个视图：胸骨旁长轴 (PLAX)、胸骨旁短轴 (PSAX)、心尖 4 腔 (A4C)、肋下 4 腔(S4C), 和肋下下腔静脉 (SIVC) 视图。学生在训练前、训练后立即和训练后 8 周进行了 5 视图图像采集技能测试，使用的是一名健康志愿者。三名盲法评估员使用经过验证的最高 10 分评分系统对图像质量进行评分。学生使用手持式超声探头 (Butterfly iQ)。54 名学生完成了实践培训，以及培训前后的技能测试。27 名学生完成了为期 8 周的培训后技能测试。训练前和训练后 8 周之间的技能测试分数提高了 2.11 分（95% CI，1.22-3.00；效果大小，1.13）。心脏 POCUS 课程展示了中期技能保留。该课程足以保持 S4C 和 SIVC 技能，但不足以用于 PLAX、PSAX 和 A4C。所以，