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Effects of Heat

  1. HEAT CRAMPS: (miner’ cramps / fireman’ s cramps )due to loss of Na+ ion by rapid dehydration of body.
  2. HEAT HYPERPYREXIA or HEAT STROKE: - High temp, increased humidity, minor infection, muscular activity and lack of acclimatization are the principle factor in initiation.
    1. Failure of cutaneous blood flow and sweating leads to breakdown of heat regulating center of hypothalamus.
    2. On Autopsy reduction and edema of purkinje cells of cerebellum.
    3. Breathing is rapid deep and kussumal type.
  3. THERMIC FEVER or SUN STROKE is used when ther is direct exposure to the sun.
  4. HEAT PROSTRATION: collapse without increase in body temperature. It follows exposure to excessive heat.
     
    - Main cause of death is vascular collapse and syncope.
  5. DIFFERENCE BETWEEN AM & PM BURN

TRAIT

ANTEMORTEM BURN

POSTMORTEM BURN

Line of redness

Present

Absent

Blister

 

Contains mucous fluid with proteins and chlorides. Base is inflamed, red and inflammed.

Contains air and thin clear fluid only. Base is dry hard and yellow.

 

Vital reaction

Present

Absent

Enzymes

 

Increase in enzyme reaction and SH group.

Does not show increase in enzyme reaction.

Co Hb

> Then 5% of CO Hb

< Then 5% of CO Hb


Heat Hematoma versus EDH due to blunt force:
 

  EDH due to burns
(Heat Hematoma)
EDH due to blunt force
Cause Intense heat Blunt force impact
Position Usu. Bilateral Usu. Unilateral
Distribution Diffuse Localised
Characters Thin, granular, soft, friable, chocolate-coloured, honeycomb, sickle-shaped, irregular margins, due to rupture of venous sinuses Discoid, localized, rubbery, reddish-purple, sharp margins, due to arterial bleeding
Skull May be fractured Fracture usu. seen in overlying temporal bone
Injury to CNS No injury Frequently injured

 

  1. SCALDS:
    1. caused by application of liquid above 60o C or steam.
    2. skin becomes sodden and bleach.
    3. Clothes are wet but not burn.




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