Training to deeper compression depth reduces shallow compressions after six months in a manikin model.

Abstract

Studies show that students, trained to perform compressions between 40 and 50mm deep, often do not achieve sufficient depth at retention testing. We hypothesized that training to achieve depths >50mm would decrease the proportion of students with depth <40mm after 6 months, compared to students trained to a depth interval of 40-50mm. A basic life support (BLS) self-learning station was attended by 190 third year medicine students. They were first offered the possibility to refresh their skills, following the instructions of a 15min abbreviated Mini Anne™ video (Laerdal, Norway) using a full size torso and a face shield. This was followed by further training using Resusci Anne Skills Station™ software (Laerdal, Norway). Voice feedback was provided according to randomisation to a standard group (SG) 40-50mm and a deeper group (DG) >50mm. Quality of compressions was tested after 6 months. The SG and DG groups consisted of 90 (67% female) and 100 (58% female) participants respectively. At the end of training, all students reached the target depth without overlap between groups. After 6 months, the proportion of students achieving a depth <40mm was 26/89 (29%) in the SG vs. 12/89 (14%) in the DG (P=0.01). The proportion of students with a depth >50mm was 5/89 (6%) for the SG and 44/89 (49%) in the DG (P<0.001). The educational strategy to train students to a deeper depth, reduced shallow compressions 6 months after training.