<prompt> Most commonly gas used in Laparoscopy isOxygenCarbondioxideNitrous oxideRoom air  <response>: B. i.e. Carbon - dioxide 560 - Dutta 4th 217- Shaws 14th Pneumoperitoneum - Most commonly used gas is carbon dioxide 1L - 4L For diagnostic purposes nitous oxide or room air or oxygen can be used CO2 is safer than air and nitrous oxide which can cause air embolism and accidental explosion respectively The flow rate of the gas is about 1 Lminutc with a pressure not exceeding 20 mm HgCONTRAINDICATIONS OF LAPAROSCOPY Severe cardiopulmonary disease Extensive peritoneal adhesion Patient haemodynamically unstable Large pelvic tumour Generalized peritonitis Pregnancy 16 weeks Significant haemoperitoneum Previous periumbilical surgery relative Intestinal obstruction Extreme obesity 