Optimizing simulator-based training for emergency transesophageal echocardiography: A randomized controlled trial.

Background: Resuscitative clinician-performed transesophageal echocardiography (TEE) is a relatively novel ultrasound application; however, optimal teaching methods have not been determined. Previous studies have demonstrated that variable practice (VP), where practice conditions are changed, may improve learning of procedural skills compared with blocked practice (BP), where practice conditions are kept constant. We compared VP and BP for teaching resuscitative TEE to emergency medicine residents using a simulator.

Methods: Emergency medicine residents with no prior TEE experience were randomized to the BP or VP groups. The BP group practiced 10 repetitions of a fixed five-view TEE sequence, while the VP group practiced 10 different random five-view TEE sequences on a simulator. Participants completed a performance assessment immediately after training and a transfer test 2 weeks after training. Ultrasound images and transducer motion metrics were captured by the simulator for blinded analysis. The primary outcome was the percentage of successful views on the transfer test.

Results: Twenty-eight participants completed the study (14 in the BP group, 14 in the VP group). The BP group had a higher rate of successful views compared with the VP group on the transfer test (93.6% vs. 77.6%;  = 0.002). The BP group also had higher image quality on a 5-point scale (3.3 vs. 2.9;  = 0.01) and fewer probe angular changes (2982.5 degrees vs. 4239.8 degrees;  = 0.04). There were no statistically significant differences between the groups for the rate of correct diagnoses, confidence level, or scan time.

Conclusions: Practicing a fixed sequence of views was more effective than a variable sequence of views for learning resuscitative TEE on a simulator. These results should be validated in TEE scans performed in the clinical environment.