<prompt> Reactionary hemorrhage occurs within what duration of surgery6 hours12 hours24 hours48 hours  <response>: Ans. is c i.e., 24 hours Hemorrhage in surgery Primary haemorrhage is haemorrhage occurring immediately as a result of an injury or surgery. Reactionary haemorrhage is delayed haemorrhage within 24 hours and is usually caused by dislodgement of clot by resuscitation, normalisation of blood pres- sure and vasodilatation. Reactionary haemorrhage may also result from technical failure such as slippage of a ligature. Secondary haemorrhage is caused by sloughing of the wall of a vessel. It usually occurs 7-14 days after injury and is precipitated by factors such as infection, pressure necrosis such as from a drain or malignancy. 