Assessing the quality of CPR performed by a single lifeguard, two lifeguards and a lifeguard with a bystander after water rescue: a quasi-experimental trial.

Background: High-quality cardiopulmonary resuscitation (CPR) could improve survival of drowning victims. The purpose of the study is to assess the impact of fatigue caused by water rescue on subsequent CPR quality and the influence of a bystander's participation on CPR quality in a lifeguard rescue.

Methods: This was a simulated quasi-experimental study with a sample of 14 lifeguards and 13 laypersons.