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Forensic Medicine - Exam POV: Senior Examiner Expectations

1. EMBALMING

Definition (1 liner must)

"Embalming is the treatment of a dead body with antiseptics and preservatives to delay putrefaction by causing coagulation and fixation of tissue proteins."

• Ideal time: within 6 hours of death
• Embalming does NOT mean the body will never decompose - an un-cared embalmed body eventually mummifies

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Embalming Fluid Composition (Table - Examiner favourite!)

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Types of Embalming

• Fluid injected into arteries → diffuses via capillaries into tissues
• Injection devices: Hand/foot pump, Stirrup pump, Bulb syringe, Gravity injector (simplest/slowest/safest), Motorized injector (best)
• Drainage done simultaneously from veins
• Discontinuous injection of small quantities (~1-2 L at a time) followed by drainage = best method

• Right & Left common carotid - head and neck
• Right & Left axillary arteries - upper limbs
• Right & Left femoral arteries - lower limbs
• Trunk embalmed by directing fluid through these arteries toward the heart

• Done 30 min to 1 hour after arterial embalming (to allow viscera to harden)
• Trocar inserted 5-6 cm above umbilicus in midline
• Steps of aspiration (trocar direction - commonly asked!):
  1. Upward + backward + left → stomach
  2. Slightly withdrawn, pushed right → right heart
  3. Pierce diaphragm → pleural sacs (right then left)
  4. Multiple punctures → small intestine, caecum, colon
  5. Aspirate urinary bladder, sigmoid colon, rectum
• Cavity fluid composition: Formalin 60%, Methanol 25%, Phenol 10%, Glycerin 25%
• 1 L injected in abdomen + 1 L in thoracic cavity

• Wear apron, cap, mask, gloves
• Remove clothing and surgical dressings
• Break rigor mortis by bending/massage
• Plug nostrils and anal orifice with cotton soaked in arterial solution
• Head elevated 8-10 cm; feet raised for drainage

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Medicolegal Importance of Embalming

• Embalming delays toxicological analysis - formalin and methanol in fluid can interfere with chemical analysis
• Vitreous humor, synovial fluid, and bile are ideal samples for toxicology in embalmed bodies (less affected)
• Permission from police required before embalming in medicolegal cases
• Kennedy phenomenon: Surgical alteration or suturing of GSW wounds during embalming makes wound evaluation difficult

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2. SKIN INCISIONS IN AUTOPSY

Types (Senior examiner expects all with features)

Exam tips on incisions:

• Asphyxial deaths / neck involvement → Modified Y preferred (avoids neck skin damage)
• Custodial death / torture → X-incision on back to look for deep muscle contusions (lathi blows)
• All incisions should be taken down to deep fascia in a single stroke
• Skin flaps should be reflected carefully to avoid creating artefacts

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3. POSTMORTEM (PM) ARTEFACTS

Definition

"Any change introduced into a body after death that may lead to misinterpretation of medicolegally significant antemortem findings." (Dorland's dictionary cited in PC Dikshit)

Consequences of misinterpreted artefacts:

1. Wrong cause of death
2. Wrong manner of death
3. Undue suspicion of criminal offense
4. Halt in homicide investigation
5. Non-detection of murder
6. Miscarriage of justice in civil suits

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Classification

A. Artefacts Introduced BETWEEN Death and Autopsy

• Regurgitation and aspiration of gastric contents (very common)
• Occurs terminally, during body handling, or resuscitation
• May wrongly be given as cause of death

• Injection marks (cardiac region or extremities) - must differentiate from drug abuse marks
• Intracardiac injection → bruising of heart + blood in pericardium
• Defibrillator → ring-like bruises over chest
• CPR → rib fractures (no blood effusion at fracture site - distinguishes from antemortem fractures)
• Fat embolism / bone marrow embolism can follow PM rib fractures

• Trocar holes may be confused with gunshot entry wounds
• Weapon track/bullet track may be disturbed creating false tracks
• Embalming fluids (formaldehyde, methanol) interfere with toxicological analysis
• Surgical suturing of GSW = Kennedy phenomenon

• Fungus growth at body orifices/eyes/injury sites → mimics bruising (discoloration)
• Body exposed to soil contaminants and draining water

• Breaking rigor while handling → false estimate of time of death
• Rigor of heart → may simulate concentric hypertrophy
• Hypostasis colour: usually purplish; cherry red = CO poisoning; pink = cold/refrigeration
• Localized hypostasis areas may resemble bruises

• Swelling of lips, nose, eyelids, protrusion of eyes → false impression of obesity
• Fluid from mouth/nose + pulmonary oedema → wrongly diagnosed as massive haemorrhage
• Decomposition blebs → mistaken for burns vesications
• Deep groove around neck from collar → mistaken for ligature mark
• Gas from decomposition → may resemble air embolism (test: alkaline pyrogallol test - turns brown with O₂ in antemortem air embolism, NOT with decomposition gas)

• Drainage holes/embalmer's trocar holes → confused with GSW entry wounds
• Surgical alteration of wounds = Kennedy phenomenon
• Decomposed bodies: GSW greatly modified

• Alcohol produced by putrefaction: usually < 100 mg% (> 100 mg% → suspect antemortem ingestion)
• Decomposition → increase in carboxyhaemoglobin (up to 19-25%)
• Cyanide produced by decomposition: up to 10 mg% in 3-month-old blood
• Substituted phenols from decomposing tissues interfere with analysis

B. Artefacts Introduced DURING Autopsy

• Improper technique creating false wounds
• Contamination of viscera samples

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4. NHRC GUIDELINES

What NHRC is - 1 liner

National Human Rights Commission established in October 1993 - requires all custodial deaths and encounter deaths to be reported within 24 hours.

Cases requiring NHRC guidelines:

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Key NHRC Guidelines - What Examiner Expects:

• All custodial deaths (police custody + judicial custody) reported to NHRC within 24 hours
• Second report with PM findings + magisterial inquiry submitted to NHRC within 2 months

• Forensic expert(s) - lead autopsy, document findings
• Pathologist/Scientist - histopathology, toxicology
• Radiologist - pre-autopsy X-ray/CT scan
• Photographer/Videographer - mandatory
• Police/Magistrate - inquest + chain of custody
• FSL experts - toxicology, histology, DNA
• Support staff

• NHRC notified within 24 hours
• Magistrate's inquest mandatory
• Body transported sealed with hands in paper bags inside a zipped body bag

• Conducted by 3 forensic experts
• NHRC pro forma (model autopsy form) must be used
• Videography + 20-25 photographs mandatory
• Injuries measured from fixed bony landmarks (distance from midline + from heel)
• Autopsy only in natural light (no artificial light only)
• Clothing handled only by doctors, sealed, sent to FSL
• Should be done at Govt Medical College teaching hospitals with FM department

• Phase I: Clothing/bearings of body individually videographed, focusing on stains, cuts, holes
• Phase II: Front view on autopsy table - before and after wiping; then same for back

• Record findings suggesting custodial torture
• Supplement PM report with video evidence
• Facilitate independent review at a later stage

• Report must be typed/computerized with fingerprints
• Reports + video + FSL findings submitted to NHRC within 2 months
• Compensation matters referred to State Government

• Done under NHRC supervision
• Videography mandatory
• Fresh report prepared

• Back of body must be examined with X-incision for deep muscle contusions from beating (especially lathi/baton injuries)

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NHRC Model Autopsy Form - Key Points:

• Based on UN guidelines (Minnesota Protocol 2016)
• Introduced from 1st October 1995
• Covers: identification, clothing, injuries (type, location, size, shape), time of death markers, toxicology, histology

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QUICK SUMMARY TABLE - What Examiner Wants You to Know

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