In the 1950s, Peter Safar and James Elam conducted experiments on oxygen deficiency, inadvertently stumbling upon the life-saving technique of mouth-to-mouth resuscitation. Through their research, they discovered that blowing air into the lungs and performing chest compressions could help revive individuals in cardiac arrest. Building upon these findings, Safar and Elam further developed CPR as a standardized approach for resuscitating individuals experiencing cardiac or respiratory arrest. This approach provided a simple yet effective method that could be easily taught and administered by bystanders or medical professionals alike. CPR has since become a crucial element in the chain of survival, empowering individuals to intervene during critical moments and significantly improving the chances of survival for those in cardiac distress.