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  Ventilation, used to deliver supplemental oxygenation to respiratory-failing patients, is a crucial procedure. It was described ages ago, and since that time, techniques and devices used are continuously improving. Claudius Galenus was among the first to talk about lungs and ventilation almost 2000 years ago and since then, several scientists and philosophers have tried to understand this concept. At the middle of the 20th century, several unidirectional valves were developed with different characteristics. Many different manual ventilation methods were described and used including mouth-to-mouth and mouth-to-nose but the   bag-valve-mask (BVM)   technique remains the commonly used one in emergency situations and in prehospital settings. The original bag-valve-mask concept was developed in 1953 by the German doctor Holger Hesse and his partner Danish anesthetist Henning Ruben, following their initial work on a suction pump. Their resuscitator, named “ Ambu ”(Artificial ...