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Cardiac arrest (CA) is the sudden cessation of cardiac ejection, severe ischemia and hypoxia of vital organs such as heart and brain, leading to the termination of life. This unexpected sudden death is also known as sudden death in medicine. CA is a combination of high incidence and low survival. About 350,000 out-of-hospital cardiac arrest (OHCA) cases occur in the United States each year (1-3). Although a series of new guidelines and standards were issued (1,2). The average survival rate for OHCA in the United States barely changed from 1978 to 2008 (4). With the development of science and technology and economy, people’s living standard is constantly improved, and the risk Original Article

Efficiency of mechanical chest compressions with the LUCAS device in out-of-hospital cardiac arrest patients: a meta-analysis