Most common organ affected in underwater blast

Most common organ affected in
underwater blast ?
a) Intestine
b) Liver
c) Spleen
d) Heart
Correct Answer - A
Ans. is ‘a’ i.e., Intestine
The most common organ affected in underwater blast injury is
Explosion injury
An explosion is a phenomenon resulting from sudden release of
energy which is then dissipated by a blast wave, by translocation of
objects, or by the generation of heat. Injuries in explosion occur due
to four factors :?

  1. Blast or shock wave
    When an explosion occurs, the explosive material produces a large
    volume of gas and releases a large amount of energy. It produces a
    ‘shock wave’ which spread concentrically from the site of explosion.
    The injuries depend on the enviornment in which blast occurs :-
    i. Air blast (most common) : Explosion occurs in air. There is
    barotrauma to air filled hollow organs. Tympanic membrane (ear
    drum) is most sensitive and most commonly injured. Lung is the
    second organ to be injured and is the most commonly injured hollow
    organ and most common cause of life threatening injury. Other parts
    injured are middle ear, cochlea, eyes, bowels, mesentery, omentum
    and brain. Homogenous solid organs like liver and muscles are
    usually not affected.
    Under water blast (explosion under water): Gastrointestinal tract is
    injured most commonly. Lungs are also injured.
    iii. Solid blast : Explosive is detonated near a rigid/solid structure and
    wave of energy spreads through it. If people are in contact with that
    rigid structure, injuries take place. The injuries are mostly skeletal;
    fracture of legs and vertebral column are more common. GIT
    damage is more common than lung.
  2. Flame or hot gases
    Burns or burning of body may occur.
  3. Flying missiles (debris)
    Flying pieces of explosive debris may be driven through air against
    the skin causing bruises, abrasions, lacerations, and ragged
  4. Anoxia
    Various gases liberated during explosion may cause anoxia, e.g.
    carbon monoxide, nitrous oxide, nitric oxide, HCN and SO,