FM2.1-11,FM14.5 | Forensic Pathology: Death & Thanatology — Glossary

Saponification of body fat into a waxy, soap-like grey-white material (ammonium salts of fatty acids); forms in warm, moist, anaerobic conditions over months; preserves body shape.

Post-mortem cooling of the body after death, at a rate of approximately 1.5°C/h under standard conditions; the basis for Henssge nomogram-based PMI estimation.

A clinical test for brainstem death in which the patient is disconnected from the ventilator after pre-oxygenation; brain death is confirmed if no respiratory effort occurs when PaCO2 rises to ≥60 mmHg.

Arrhythmogenic right ventricular cardiomyopathy — fibro-fatty replacement of right ventricular myocardium; a genetic condition causing sudden death in young adults, especially during exercise.

A mode of death characterised by oxygen deprivation to tissues and CO2 accumulation due to primary respiratory system failure; may be mechanical or non-mechanical.

A THOTA-mandated regulatory committee that evaluates and approves non-relative living donor transplantation applications to ensure voluntary consent and absence of commercialisation.

A saccular (round) aneurysm arising at branching points of the circle of Willis; rupture causes subarachnoid haemorrhage and is a leading cause of sudden death in young adults.

The classical three-mode classification of death by Xavier Bichat (1771-1802): coma (brain failure), asphyxia (respiratory failure), and syncope (cardiac failure).

Irreversible cessation of all functions of the entire brain, including the brainstem; constitutes legal death in India under THOTA when certified by the required medical board.

Under THOTA Section 2(c): permanent and irreversible cessation of all functions of the brain including the brainstem; the legal basis for deceased donor organ procurement in India.

Irreversible loss of all brainstem functions including the respiratory centre; diagnosed by absent brainstem reflexes and a positive apnoea test; constitutes legal brain death.

Instantaneous muscular contraction occurring at the exact moment of death, without preceding flaccidity; preserves the grip/posture at death; forensically significant for manner-of-death analysis.

A rough equivalence for decomposition rates across environments: 1 week in open air ≈ 2 weeks in water ≈ 8 weeks in earth.

The sequence of diseases or conditions in MCCD Part I, from immediate cause (Ia) back to the underlying original cause (Ic), connected by 'due to' relationships.

The irreversible extinction of individual cells following somatic death; occurs in a tissue-dependent sequence with neurons most vulnerable (4-6 min) and connective tissue most resilient.

An inherited disorder of cardiac ion channels (e.g. long QT syndrome, Brugada syndrome) producing fatal arrhythmias in structurally normal hearts; requires molecular autopsy for diagnosis.

Rigidity of a body due to freezing of muscle fluids in sub-zero temperatures; NOT rigor mortis — resolves completely on thawing.

A mode of death in which the brain is the primary organ failing, with progressive loss of CNS regulation leading to secondary cardiorespiratory failure.

Loss of higher cortical functions (consciousness, awareness) with intact brainstem; synonymous with persistent vegetative state (PVS); the patient is alive and NOT legally dead.

Code of Criminal Procedure Section 174 — empowers a police officer to investigate sudden, suspicious, or unknown-cause deaths and to hold an inquest.

A 2008 international consensus document establishing principles against transplant tourism and organ trafficking; India's THOTA aligns with its core provisions.

Organ procurement after cardiac death (as opposed to brain death); permitted under the 2014 THOTA Rules amendment; less common than brain-death donation in India.

The use of insect species, developmental stage, and accumulated degree hours to estimate PMI; most accurate method for PMI estimation beyond 3 days.

The standard Indian MCCD form under the Registration of Births and Deaths Act 1969; completed by the certifying physician to register a death.

The four-member certification board required for brain death declaration under THOTA: doctor in charge of hospital or nominee, doctor in charge of the patient, neurologist or neurosurgeon, and a government-appointed doctor.

Post-mortem rigidity caused by heat-induced coagulation of muscle proteins; produces the pugilistic attitude; NOT rigor mortis.

A mathematical model for PMI estimation from rectal and ambient temperatures, incorporating corrective factors for body weight and covering; reliable up to approximately 24h post-mortem.

A genetic disorder of sarcomeric proteins causing asymmetric ventricular hypertrophy and myocyte disarray; the leading cause of sudden cardiac death in young athletes.

The 11th revision of the International Classification of Diseases, published by WHO; effective 1 January 2022; used to code the underlying cause of death from the MCCD for public health statistics.

The final disease or complication that directly caused death (MCCD Part I Row Ia); e.g. respiratory failure, acute myocardial infarction — NOT cardiac arrest, which is a terminal mechanism.

Coronary artery disease causing myocardial ischaemia; the most common cause of sudden natural death in adults overall.

Sterile autolytic softening of tissues in fluid, most commonly of a dead foetus in utero; skin becomes red-brown and slips off; begins within 12-24h of foetal death.

The circumstantial classification of a death as natural, accidental, homicidal, suicidal, or undetermined; determines the medicolegal pathway and whether police involvement is required.

A legal document (Form 4A in India) issued by the attending registered medical practitioner certifying the cause of death, required for death registration under the Registration of Births and Deaths Act 1969.

Genetic testing of post-mortem tissue to identify heritable channelopathies (LQTS, Brugada, CPVT) as a cause of autopsy-negative sudden death.

Latin for apparent death; the classical term for suspended animation — a state of greatly diminished metabolism in which the person is alive but appears dead.

Preservation of the body by desiccation in dry, warm, ventilated conditions; the body becomes shrunken, leathery, and dark brown; resists putrefaction.

Death resulting solely from disease or natural bodily dysfunction, with no external cause contributing; may be certified by the attending physician.

Under THOTA post-2011: spouse, son, daughter, father, mother, brother, sister, grandparents, and grandchildren; near-relatives may donate without Authorisation Committee approval.

National Organ Transplant Programme — introduced by the 2011 THOTA amendment; coordinates deceased donor organ procurement and allocation nationally under the Ministry of Health.

National Organ and Tissue Transplant Organisation — the apex body under NOTP managing the national registry for deceased donor organ allocation in India.

An organ donation system requiring explicit consent from the donor (or their family) before organs can be procured; India uses this system — family consent is required even if the deceased registered as a donor.

An organ donation system in which everyone is presumed to consent to donation unless they have explicitly registered an objection; used in Spain, Wales, and several other countries; NOT used in India.

The section of the MCCD recording the direct causal chain: Row Ia (immediate cause) → Ib (intermediate cause) → Ic (underlying cause), read as 'Ia was due to Ib, which was due to Ic'.

The section of the MCCD for other significant conditions that contributed to death but were not part of the direct causal chain in Part I.

A clinical condition of wakefulness without awareness caused by severe cortical damage with intact brainstem; the patient breathes spontaneously and is not brain-dead.

The time elapsed since death; estimated by integrating multiple methods (body temperature, rigor staging, lividity fixation, stomach contents, entomology, vitreous chemistry); always expressed as a range.

Gravitational settling of blood into dependent vessels after death, producing blue-purple skin discolouration; fixed at ~8-12h; colour varies with cause of death (cherry-red = CO, brown = methaemoglobinaemia).

Bacterial decomposition of body tissues after death; progresses from green discolouration → bloating → skin slippage → liquefaction; accelerated by warmth and humidity.

The Indian statute mandating registration of all births and deaths with local registrars; the legal basis for the MCCD requirement.

The brief period (approximately 4-6 minutes in normothermia) following cardiorespiratory arrest during which resuscitation can restore function before irreversible neuronal death occurs.

Post-mortem muscular stiffening due to ATP depletion and permanent actin-myosin cross-bridge formation; at ~25-30°C: onset 1-2h, fully established 6-12h, resolving from 24-36h; temperature-dependent.

Sudden Infant Death Syndrome — the unexplained death of an infant under 12 months after thorough investigation (autopsy, history, scene); a diagnosis of exclusion; peak age 2-4 months.

The cessation of integrated vital functions of the organism as a whole (heartbeat, respiration, CNS activity), with a brief window of reversibility before cellular death is complete.

Unexpected rapid death occurring within 1 hour of symptom onset (witnessed) or 24 hours of last being seen alive (unwitnessed), from an internal cause.

Sudden Unexpected Death in Epilepsy — an unexplained death in a person with epilepsy, typically during or after a generalised seizure; mechanism poorly understood.

Sudden Unexplained Death Syndrome in adults (SUNDS = sudden unexplained nocturnal death syndrome); autopsy-negative sudden death often linked to Brugada syndrome channelopathy.

A state of profound metabolic depression (due to hypothermia, drug overdose, electrocution, etc.) in which vital signs are imperceptible but the person is alive; must be excluded before certifying death.

Paired kidney exchange where two ABO-incompatible near-relative donor-recipient pairs exchange donors to achieve compatible transplants; permitted under the 2011 THOTA amendment.

A mode of death from sudden primary cardiac failure leading to cessation of perfusion and secondary brain and respiratory failure; the pathway in sudden cardiac death.

The Transplantation of Human Organs and Tissues Act 1994 (amended 2011); the Indian statute defining brain death and governing organ donation; requires a four-doctor board for brain death certification.

The original disease or injury that initiated the chain of events leading to death; the lowest occupied row in MCCD Part I; the ICD-11 coding target for public health statistics.

Death due to external causes — accident, homicide, or suicide — requiring police notification and potentially forensic autopsy.

Potassium released from retinal cells post-mortem into the vitreous humour at ~0.14-0.17 mmol/L per hour; used as a biochemical PMI marker when other methods are unreliable.

The online tool at icd.who.int for searching and selecting ICD-11 codes; used to code the underlying cause of death identified in MCCD Part I Ic.