During the mouth to mouth ventilation of basic life support, the high
inflation pressures generated may result in later complications. Pulmo
nary barotrauma may result in pneumothorax or pneumomediastinum, and h
igh pressures applied to the gastrointestinal tract may lead to gastri
c rupture and pneumoperitoneum. A case is reported of pneumoperitoneum
in the absence of pneumothorax, pneumomediastinum or gastrointestinal
perforation and the literature relating to this unusual condition is
reviewed.