Statement not true about post-mortem staining is: (LQ)
|A||Seen only in dependent parts|
|B||Not seen in parts tied with a tight cloth or at pressure points|
|C||Appears immediately after death|
|D||Disappears within 24 hours with discoloration|
Disappears within 24 hours with discoloration
(Post Mortem Staining = Post Mortem Hypostasis= Livor mortis= Suggilations= Cadaveric lividity= Vibices= Darkening of death- is bluish-red / purplish-red discolouration under the skin (superficial layer) on dependant parts of body (due to capillo-venous distension), except over pressure points. It persists till it merges with changes of decomposition.
a. Begins shortly after death as patchy mottling – not visible ½ - 1 hr in normal persons, 1-4 hr in anemic.
b. Well developed in 4 hr and reaches maximum 6-12 hrs.
c. Fixation of hypostasis occurs in 6 hrs.
d. In a body lying on its back, it first appears in neck spreading to entire back except parts directly pressed on i.e. shoulder-blades, buttocks, calves and heel.
e. Poisoning detected from PMS: CO - cherry-red, HCN & Burns - bright red, nitrites + Potassium chlorate + Potassium bicarbonate + nitrobenzene + aniline (MetHb) – red.
f. Stomach and intestines when stretched show alternate stained and unstained areas.
g. Post-mortem staining can occur in some cases before death in cholera, TB, CCF, morphine poisoning, asphyxia. It is less marked in death from lobar pneumonia and other conditions where blood coagulates quickly.
h. In hanging, hypostasis will be most marked in legs and hands.)