Association of chest compression and recoil velocities with depth and rate in manual cardiopulmonary resuscitation

• Published in: Resuscitation 2019-09, Vol.142, p.119-126
• Main Authors: González-Otero, Digna María, Russell, James Knox, Ruiz, Jesus María, Ruiz de Gauna, Sofía, Gutiérrez, José Julio, Leturiondo, Luis Alberto, Daya, Mohamud Ramzan
• Format: Article
• Language: English
• Subjects: Cardiopulmonary resuscitation (CPR); Chest compression; Compression depth; Compression rate; High-quality CPR; Recoil velocity; Release velocity
• ISSN: 0300-9572; 1873-1570
• DOI: 10.1016/j.resuscitation.2019.07.023

Maximum velocity during chest recoil has been proposed as a metric for chest compression quality during cardiopulmonary resuscitation (CPR). This study investigated the relationship of the maximum velocities during compression and recoil phases with compression depth and rate in manual CPR. We measured compression instances in out-of-hospital cardiac arrest recordings using custom Matlab programs. Each compression cycle was characterized by depth and rate, maximum compression and recoil velocities (CV and RV), and compression and recoil durations (total and effective). Mean compression and recoil velocities were computed as depth divided by compression and recoil durations, respectively. We correlated CV and RV with their corresponding mean velocities (total and effective), characterized by Pearson's correlation coefficient. CV/RV were strongly correlated with their corresponding mean velocities, with a median r of 0.83 (0.77–0.88)/0.82 (0.76–0.87) in per patient analysis, 0.86/0.88 for all the population. Correlation with mean effective velocities had a median r of 0.91 (0.87–0.94)/0.92 (0.89–0.94) in per-patient, 0.92/0.94 globally (p