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Post mortem lividity

1. Post Mortem Lividity Also known as Hypostasis or Liver Mortis

2. Definition BLUISH PURPLE DISCOLOURATION OF THE MOST DEPENDENT PARTS OF THE BODY DUE TO GRAVITATION OF THE BLOOD AFTER CESSATION OF CIRCULATION TO THE MOST DEPENDENT CAPILLARIES. SITE OF APPEARANCE: THIS DEPENDS ON THE ORIGINAL POSTURE OF THE BODY AFTER DEATH. MOST DEATHS OCCUR IN SUPINE POSITION AND THUS HYPOSTASIS WILL APPEAR ON THE BACK OF THE CADAVER (DORSAL DISTRIBUTION )

3. IN CASES OF HANGING,LIVIDITY IS NOTICED IN THE FOREARMS,LOWER LEGS ,EAR LOBULES AND EXTERNAL GENITALIA. IN CASES OF DROWNING IT IS NOTICED IN THE FACE AND SHOULDERS. HYPOSTASIS WILL NOT APPEAR IN- 1-AREAS SUBJECTED TO PRESSURE EITHER BY THE BODY WIGHT (AREAS OF CONTACT FLATTENING) 2- TIGHT CLOTHINGS EG. TIGHT WAIST BAND 3-ALSO NOT SEEN IN SKIN FOLDS. THE SLIGHTEST PRESSURE BY THESE AGENTS WILL PREVENT CAPILLARY FILLING WITH BLOOD.

4. CESSATION OF THE CIRCULATION RELAXATION OF THE BLOOD VESSEL MUSCLE FLUIDTY OF THE BLOOD AFTER DEATH DUE TO RELEASING OF FIBRENOLYSIN FROM WALL OF BLOOD VESSEL Causes

5. Time of Appearance IMMEDIATELY AFTER CESSATION OF CIRCULATION AND BECOME VISIBLE AFTER 2 HOURS AS DISCRETE PATCHES. IN CASES OF DEATHS DUE TO CONGESTIVE HEART FAILURE(SLUGGISH CIRCULATION AND HIGH LEVELS OF REDUCED HAEMOGLOBIN)AND DEATHS ASSOCIATED WITH PROLONGED. AS TIME PASSES,HYPOSTATIC PATCHES BECOME CONFLUENT AND MORE INTENSE IN COLOUR. MAXIMUM DISTRIBUTION OCCUR AFTER 8 HOURS AND THE DISTRIBUTION BECOME FIXED

6. BLOOD CANNOT PASS OUT OF THE CAPILLARIES AFTER FORMATION OF POSTMORTEM HYPOSTASIS. RIGOUR MORTIS OBLITERATES THE BIG VESSELS, AND AS SUCH THE BLOOD CANNOT PASS THROUGH THESE VESSELS TO SETTLE IN VENULES AND CAPILLARIES IN A NEW AREA. AFTER FULL DEVELOPMENT OF RIGOR MORTIS, VENULES AND CAPILLARIES ARE COMPRESSED AND ALMOST EMPTY AND CANNOT BE EASILY DISTENDED BY THE RESETTLING BLOOD Fixation of post-mortem hypostasis

7. Medico legal importance 1- SURE SIGN OF DEATH. 2- DETERMINATION OF THE TIME OF DEATH. JUDGMENT WILL DEPEND ON THE EXTENT OF DISTRIBUTION AND WHETHER IT BECOME FIXED OR NOT. 3- GIVE AN IDEA ABOUT THE CAUSE OF DEATH DEPENDING ON THE COLOUR OF HYPOSTATIC PATCHES. 4- DETERMINATION OF WHETHER THE POSITION OF THE CORPS HAS BEEN CHANGED AFTER DEATH DEPENDING ON DUAL DISTRIBUTION

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