Interruptions in CPR when using mechanical chest compression devices

As part of a larger study (North American LUCAS Evaluation—NALE), Yost et al set out to analyse the interruptions to CPR during application and use of the LUCAS™. They identify this as an important factor for consideration when using these devices, as if the delay is too long then this might outweigh potential benefits to the patient of MCC.

Two approaches to data collection were used: a brief survey after each out-of-hospital cardiac arrest (OOHCA) to establish pre-hospital providers' perceptions of the length of time associated with interruptions to CPR while applying the LUCAS™; and electrocardiograph (ECG) and impedance data downloaded from the LIFEPAK 12 monitor/defibrillators to measure actual time of interruptions.

Five performance features were measured: length of CPR interruption due to application of the LUCAS™; length of pre-shock interruptions; length of post-shock interruptions; compression fraction for MCC (% of time that compressions were occurring); compression rate for MCC.