<prompt> Operation theatre fire is most commonly due to:-Argon beam coagulationLasersFibre optic illuminationElectrosurgical equipment  <response>: ECRIs analysis of case repos show that the most common ignition sources are electrosurgical instruments 68 lasers13. Most common fire location is airway35, head or face28, elsewhere on or inside the patient 38. An oxygen enriched atmostphere was a contribution factor in 74 of all cases. 