structural:reformatting, stylistic:style_transfer, structural:summarization
History

In the 19th century, Doctor H. R. Silvester described a method (the Silvester method) of artificial ventilation in which the patient is laid on their back, and their arms are raised above their head to aid inhalation and then pressed against their chest to aid exhalation. The Holger Nielsen technique of artificial respiration, developed by Danish physician Holger Nielsen, revolutionized the field of emergency medical care. Introduced in the early 20th century, this technique involved positioning the patient in a supine position (lying flat on their back) and the performer of the technique kneeling beside or above the patient. The Holger Nielsen technique utilized a manual resuscitator, commonly referred to as the "Holger Nielsen bag," to administer rescue breaths. The performer would place a mask or the bag's mouthpiece over the patient's mouth and nose while manually compressing the bag. This action would deliver a controlled flow of air into the patient's lungs, aiding in oxygenation and facilitating the exchange of gases.