TRIPOD OF LIFE DEATH

summarise : SN-1: Tripod of life Tripod of life: brain, heart and lungs are the three very important vital organs in the body. The functioning of these three organs is considered as evidence of life. It is thought that life depends on these three systems and if any one of these three systems fails, all other systems also fail. These three systems are also known as 'atria mortis, that is, death's portal ofentry or gateway ofdeath. According to Bichat, the afore mentioned three vital organs, that is, brain, heart and lungs consti tute the tripod of life. Thus, Bichat's tripod oflife' includes three vital organs (Fig. 6A.1). 1) Brain (consciousness). 2) Heart (circulation). 3) Lungs (breathing/respiration). It was acriterion.ofdeathin the past. Itwas believed that life could be compared to a tripod with the three legs representing brain, heart and lungs. Permanent and irreversible cessation of functions of all these three interlinked vital systems of the body was called death. However, it is well known today that death occurs in two phases, somatic death and molecular death. Somatic death is actually complete and irrevers Brain consciousness) Tripod of life Heart (circulation) Lungs (breathing/respiration) FIG. 6A.1 Bichat's tripod of life ible cssation/stoppage of the functions of bra. (consciousness), heart (i.e. circulation) and lune. ain ungs (i.e. respiration). Example: A patient suddenly loses hisconscioue ness, his hcart stops working (i.e. flat ECG) and the lungs also stop working (i.e, no breathing). I is cquivalent to the loss of tripod of life. However we cannot call it somatic death because we do not know whether the loss of these three functions is reversible or irreversible. Suppose, we perform CPR and the person revives, we can say that the functions ofall these three organs stopped working reversibly. Assume that after CPR the patient does not revive, it means that the functions of all these three organs stopped working irreversibly. The lat ter case suggests somatic death, that is, complete and irreversible cessation/stoppage of the brain functions, circulation and respiration

The image explains the concept of the "Tripod of Life" as described by Bichat, referring to the three vital organs: brain (consciousness), heart (circulation), and lungs (respiration). Here's a summary:

Tripod of Life:

Definition: The brain, heart, and lungs are considered the three essential organs critical for sustaining life.
Concept: These organs form a metaphorical tripod, where failure of any one leg leads to collapse of the entire system.
Historical Context: In earlier times, the cessation of these three functions was used as a criterion for death.

Key Points:

Brain (Consciousness): Indicates mental and cognitive functioning.
Heart (Circulation): Reflects blood flow and oxygen transport.
Lungs (Respiration): Manages breathing and oxygen exchange.

Death and its Phases:

Somatic Death: Complete and irreversible cessation of brain, heart, and lung functions.
- Example: If someone loses consciousness, their heart stops (flat ECG), and lungs cease breathing.
Reversibility Test:
- Reversible Stoppage: If cardiopulmonary resuscitation (CPR) revives the person.
- Irreversible Stoppage: If CPR fails, it confirms somatic death.

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SUMMARISE: N-3:Suspended animation uspended animation (also known as apparent death) is a condition in which the vital signs or byroutineclinicalmethods. The person is not actually deadbut appears appar ently dead as pulse is not palpable, heart sounds are not audible, breathing movements are not visi ble and reflexes are either absent or not possible to elicit. A person may live in this state for a few seconds to 230 min. Mechanism: The metabolic rate isgreatlyreduced so the body requires very less amount of oxygen; the dissolved oxygen in the body fluids is sufficient to maintain vital function at a very low pitch. Types: 1) Voluntary (death trance): By yoga practition ers and sadhus. 2) Involuntary: In drowning, electrocution, hypo thermia, heat stroke, hypnotism, infections (eg cholera, typhoid), insanity, newborn, poisoning (barbiturates or opiates). Management: Resuscitation is successful. Cardiac massage, electric stimulation, artificial respiration. Medicolegal importance: 1) Prior to certifying death, it is better to rule out suspended animation state (by ECG and EEG) and then declare death and issue death certificate. 2) There are some examples in history when per sons in suspended animation were buried. 3) Hibernation seen in many animals is a kind of naturally occurring suspended animation. Example: A case was reported in Times of India (p. 10; 14.10.2015) with heading 50-year-old wakes up just before postmortem. The 50-year old man developed a metabolic disorder with severe electrolyte deficiency and malnutrition due to starvation. In a hospital in Mumbai, the CMO found his pulse, respiration and heart sounds to be absent and his pupils fixed and dilated. ECG was not done. The old man was certified as dead. But when he was being wheeled into the mortuary, he started breathing.

Suspended Animation (Apparent Death) Summary

Definition:
A condition where vital signs (pulse, heart sounds, breathing, and reflexes) are undetectable by routine clinical methods, giving the false impression of death. The person, however, is still alive.

Key Features:

Vital Signs: Pulse is not palpable, heart sounds are inaudible, and breathing movements are absent.
Duration: Can last from a few seconds to 30 minutes.
Mechanism: Extremely reduced metabolic rate, with minimal oxygen demand sustained by dissolved oxygen in body fluids.

Types:

Voluntary (Death Trance): Achieved by yoga practitioners and sadhus.
Involuntary: Occurs in conditions such as:
- Drowning
- Electrocution
- Hypothermia or heat stroke
- Hypnotism
- Infections (e.g., cholera, typhoid)
- Newborns
- Poisoning (e.g., barbiturates, opiates)

Management:

Resuscitation is often successful using:
- Cardiac massage
- Electric stimulation
- Artificial respiration

Medicolegal Importance:

Death certification must rule out suspended animation using ECG and EEG before declaring death.
Historical instances of people being mistakenly buried while in suspended animation.
Hibernation in animals is a natural form of suspended animation.

Example:
In 2015, a 50-year-old man in Mumbai, certified as dead due to absent pulse, respiration, and heart sounds (without ECG), began breathing just before being sent for postmortem. He had a metabolic disorder with severe electrolyte deficiency and malnutrition.

This highlights the critical need for thorough examination before declaring death.

summarise: SN-4: Modern concept of moment of death Modern concept of moment of death is 'brain stem death' (Minnesota criteria): Moment of death means the exact moment wlhen the person dies. Various criteria to define moment ofdeath: 5) All aforementioned criteria,that is,(1),.(2). (a1 and (4) mustremainunchangedforatleast12h, India, The Transplantation ofHuman Oronsns and Tissues Act, 1994 (THOTA) is based on the modern concept of brainstem death whichregu lates the removal, storage andtransplantationf human organs and tissues for therapeutic purnos and prevents the commercial dealing in huma organs andtissues. S.3(5) says that before removal of anyhuman organ from the body, the doctor must confirm brainstem death. S.3(6):Whowill certify brainstem death: A board offourmedicalexperts. 1) The RMP_(treating physician) treatingthe patient whose brainstem death has occurred. 2) ARMPin chargeofhospital in which brain stem death has occurred. 3) An independent RMP (specialist) nom inated by RMP in charge of hospital, from the panel of names approved by appropriate authority. 4) A neurologist/neurosurgeon nominated by RMP in charge of hospital, from the panel of names approved by appropriate authority. 1) Classical criteria of death: There are three organs (brain, heart and lungs) in body which constitute the "Tripod of lifc. Moment of death includes the stoppage of the functions of these three main organs. The moment of death is in a sense, somatic death. 2) Brain death: Harvard criteria (1968) and Plhil adelphia protocol (1969) follow the concept of brain death. 3) Brainstem death: Minnesota protocol (1971) followstheconcept of brainstem death. It is themodernconcept ofthemomentofdeath. Mohandas and Chou (1971) state that the brainstem isthemostimportant partof the brain. The reasons for this were: a) All vital centres ofthe body are in brain stem. Ifbrainstemis dead,all vitalfunctions of the bodybecomeabsentandsothebody isdead. b) All cortical pathways pass to trunk and limbsthrough brainstem. So if brainstem is dead, all pathwaysaredead. c) Among all the regions ofbrain,themedul 1ary neuronsaremostresistanttoanoxia.So if medullarytissuesaredead,theotherbrain tissuescanbeassumedtobedead Minnesotacriteria ofbrainstemdeath (1971): 1) Nospontaneousmovement. 2) No spontaneous respiration for a period of 4 minatatime. 3) Absent brainstem reflexes (pupillary, corneal, ciliospinal, vestibule-ocular and gagging/cough ing). 4) EEGisnotmandatory accordingto Minnesota criteria

Modern Concept of Moment of Death

Definition:
The "moment of death" is defined as brainstem death under the modern concept, as per the Minnesota criteria. It marks the irreversible cessation of all vital functions of the brainstem, the most critical part of the brain.

Key Concepts:

Traditional Criteria of Death:
- Based on the failure of the "Tripod of Life" (brain, heart, lungs).
- Represents somatic death (complete body function cessation).
Brain Death:
- Defined by Harvard Criteria (1968) and Philadelphia Protocol (1969).
Brainstem Death (Modern Concept):
- Introduced by Minnesota Protocol (1971).
- Brainstem is considered the most vital part of the brain:
  - Contains all vital centers (e.g., respiration, circulation).
  - Loss of brainstem function leads to irreversible death.
  - Medullary neurons, the most resistant to oxygen deprivation, indicate the condition of the entire brain.

Minnesota Criteria for Brainstem Death (1971):

No spontaneous movement.
No spontaneous respiration for at least 4 minutes.
Absent brainstem reflexes, including:
- Pupillary, corneal, ciliospinal, vestibulo-ocular, and gag/cough reflexes.
EEG is not mandatory.

Legal Framework in India (THOTA, 1994):

The Transplantation of Human Organs and Tissues Act bases its guidelines on brainstem death for organ transplantation and prevention of organ trafficking.
Certification of Brainstem Death: A board of four medical experts is required:
1. The treating physician (RMP).
2. The RMP in charge of the hospital.
3. An independent RMP from an approved panel.
4. A neurologist/neurosurgeon from an approved panel.

Medicolegal Implications:

Death certification relies on the confirmation of brainstem death.
Ensures clarity in organ transplantation protocols and prevents premature declaration of death.

summarise: Cause of Death 109 It is the discase or injury or combination of the two, responsible for starting the sequence of events which produce death. It may be: 1) Immediate cause ofdeath: It is the actual cause of death at the time of terminal event. It includes a disease 2) Antecedent (basic) cause of death: It is the actual pathologic process responsible for death at the time of terminal event, or prior to, or leading to the event. Example: gunshot wound to abdomen complicated by generalised peritonitis. 3) Contributory cause of death: It is the pathological process involved in or complications leading to, but not causing the terminal event, for example, carcinoma of stomach. Manner of Death It means how the cause of death came about, for exam ple, natural (e.g. disease) or unnatural (accidenta, homicidal, suicidal) or obscure. Mechanism of Death It is the physiological and biochemical derangement produced by the cause of death, which is incompati ble with life and results in death. Example: septicemia, haemorrhage, cardiac arrhythmias.

Cause of Death

The cause of death is the disease, injury, or combination of both that initiates the chain of events leading to death. It is categorized as follows:

Immediate Cause of Death:
- The direct cause of death at the time of the terminal event.
- Example: Heart attack or respiratory failure.
Antecedent (Basic) Cause of Death:
- The underlying pathological process leading to death.
- Example: Gunshot wound complicated by generalized peritonitis.
Contributory Cause of Death:
- A pathological process or complication that contributes to, but does not directly cause, the terminal event.
- Example: Stomach carcinoma.

Manner of Death

Refers to the circumstances surrounding the cause of death. It can be:

Natural: Resulting from disease.
Unnatural: Includes accidental, homicidal, or suicidal causes.
Obscure: Uncertain or unknown causes.

Mechanism of Death

The mechanism of death is the physiological or biochemical disturbance caused by the cause of death, which ultimately leads to death.

Example: Septicemia, hemorrhage, or cardiac arrhythmias.

rearrange text, reduce repetition, make it fully informational for PG student : DEFINITION OF DEATH According to Black's law dictionary, death is defined as 'cessation of life. Medicolegal definition of death: 'Permanent and irreversible cessation of functions of the three interlinked vital systems of the body.(the tripod of life), namely, the nervous, circulatory and respiratory systems. Legally, a person is considered to be dead after somatic death. According to S.2(b), Registration of Births and Deaths Act: Death is defined as permanent disap pearance of all evidence of life at any time after live birth has taken place’. Brainstem death has been defined in S.2(d) of Trans plantation of Human Organs and Tissues Act, 1994 as The stage at which all functions of brain stem have permanentdy and irreversibly ceased. concept "Tripod of Life" by Bichat Definition: The brain, heart, and lungs are considered the three essential organs critical for sustaining life. Concept: These organs form a metaphorical tripod, where failure of any one leg leads to collapse of the entire system. Historical Context: In earlier times, the cessation of these three functions was used as a criterion for death. Key Points: Brain (Consciousness): Indicates mental and cognitive functioning. Heart (Circulation): Reflects blood flow and oxygen transport. Lungs (Respiration): Manages breathing and oxygen exchange. Death and its Phases: Somatic Death: Complete and irreversible cessation of brain, heart, and lung functions. Example: If someone loses consciousness, their heart stops (flat ECG), and lungs cease breathing. Reversibility Test: Reversible Stoppage: If cardiopulmonary resuscitation (CPR) revives the person. Irreversible Stoppage: If CPR fails, it confirms somatic death. MODE, CAUSE, MANNER AND MECHANISM OF DEATH Mode of Death (Bichat's Classification) It means 'abnormal physiological state' that exists at the time of death These include: (1 Coma (i.e. failure of functions of brain), (2) syncope i.e. failure of functions of heart and (3) asphyxia (i.e. falure of respiratory system). BICHAT TRIPOD OF LIFE BRAIN [CONSCIOUSNESS] [coma] HEART [CIRCULATION] [syncope] LUNGS [BREATHING][asphyxia] Suspended Animation (Apparent Death) Summary Definition:A condition where vital signs (pulse, heart sounds, breathing, and reflexes) are undetectable by routine clinical methods, giving the false impression of death. The person, however, is still alive. Key Features: Vital Signs: Pulse is not palpable, heart sounds are inaudible, and breathing movements are absent. Duration: Can last from a few seconds to 30 minutes. Mechanism: Extremely reduced metabolic rate, with minimal oxygen demand sustained by dissolved oxygen in body fluids. Types: Voluntary (Death Trance): Achieved by yoga practitioners and sadhus. Involuntary: Occurs in conditions such as: Drowning Electrocution Hypothermia or heat stroke Hypnotism Infections (e.g., cholera, typhoid) Newborns Poisoning (e.g., barbiturates, opiates) Management: Resuscitation is often successful using: Cardiac massage Electric stimulation Artificial respiration Medicolegal Importance: Death certification must rule out suspended animation using ECG and EEG before declaring death. Historical instances of people being mistakenly buried while in suspended animation. Hibernation in animals is a natural form of suspended animation. Example: In 2015, a 50-year-old man in Mumbai, certified as dead due to absent pulse, respiration, and heart sounds (without ECG), began breathing just before being sent for postmortem. He had a metabolic disorder with severe electrolyte deficiency and malnutrition. In 2002, A mother gave birth prematurely to twins. Doctor declared them dead and handed over bodies in a plastic bag to parents. When they were about to cremate the bodies after a few hours, one of the babies had shown movement of leg. The babies were taken to another hospital , one baby could be resuscitated but died due to delay in restarting life supporting treatment. The doctor was suspended from practice by the court for dereliction of duty. This highlights the critical need for thorough examination before declaring death. Modern Concept of Moment of Death Definition:The "moment of death" is defined as brainstem death under the modern concept, as per the Minnesota criteria. It marks the irreversible cessation of all vital functions of the brainstem, the most critical part of the brain. Key Concepts: Traditional Criteria of Death: Based on the failure of the "Tripod of Life" (brain, heart, lungs). Represents somatic death (complete body function cessation). Brain Death: Defined by Harvard Criteria (1968) and Philadelphia Protocol (1969). MOMENT OF DEATH, BRAIN DEATH AND BRAIN STEM DEATH The Moment of Death [SN-4] : It means the exact moment when the person dies. Brain Death : brainstem death is necessary to declare a person dead. Types of brain death are as follows: 1) Cortical or cerebral death: It results in a vegetative state in which there is total loss of power of perception by the senses; but since brainstem is intact, respiration continues. This state of coma can be produced by cerebral hypoxia, toxic conditions or widespread brain injury. PVS Is a state due to severe brain damage (but not involving brainstem): Patient breathes spontaneously, opens and closes eyes, swallows and makes facial grimace. Cases of PVS are hot topics for euthanasia (e.g. Aruna Shanbaug). Brainstem death : Victim is irreversibly comatose and incapable of spontaneous breathing due to the loss of (1) Ascending reticular activating system (RAS) that sustains consciousness and (2) vital centres that control respiration. Brainstem death can be caused by raised ICP, cerebral oedema, intracranial haemorrhage. The dilemma of euthanasia does not apply to those who are brainstem dead. These patients are dca irreversible and unequivocal. 3) Whole brain death: Permanent cessation of func tions of cerebral cortex, cerebellum and brain stem. Mode of Death (Bichat's Classification) It means 'abnormal physiological state' that exists at the time of death These include: (1 Coma (i.e. failure of functions of brain), (2) syncope i.e. failure of functions of heart and (3) asphyxia (i.e. failure of respiratory system). Cause of Death It is the disease or injury or combination of the two, responsible for starting the sequence of events which produce death. It may be: 1) Immediate cause of death: It is the actual cause of death at the time of terminal event. It includes a disease (e.g. bronchopneumonia, peritonitis or injury present at the time of death which directly leads to death. 2) Antecedent (basic) cause of death: It is the actual pathologic process responsible for death at the time of terminal event, or prior to, or leading to the event. Example: gunshot wound to abdomen complicated by generalised peritonitis. 3) Contributory cause of death: It is the pathological process involved in or complications leading to, but not causing the terminal event, for example, carcinoma of stomach. Manner & mechanism of death Manner of Death It means how the cause of death came about, for example, natural (e.g. disease) or unnatural (accident, homicidal, suicidal) or obscure. Mechanism of Death It is the physiological and biochemical derangement produced by the cause of death, which is incompatible with life and results in death. Example: septicemia, haemorrhage, cardiac arrhythmias Moment of death means the exact moment when the person dies. Various criteria to define moment of death: 1) Classical criteria of death: There are three organs (brain, heart and lungs) in body which constitute the "Tripod of lifc. Moment of death includes the stoppage of the functions of these three main organs. The moment of death is in a sense, somatic death. 2) Brain death: Harvard criteria (1968) and Plhiladelphia protocol (1969) follow the concept of brain death. 3) Brainstem death: Minnesota protocol (1971) follows the concept of brainstem death. brainstem is the most important part of the brain. The reasons for this were: a) All vital centres of the body are in brain stem. If brainstem is dead, all vital functions of the body become absent and so the body is dead. b) All cortical pathways pass to trunk and limbs through brainstem. So if brainstem is dead, all pathways are dead. c) Among all the regions of brain, the medullary neurons are most resistant to anoxia. So if medullary tissues are dead,the other brain tissues can beassumed to be dead Brainstem Death (Modern Concept): Introduced by Minnesota Protocol (1971). Brainstem is considered the most vital part of the brain: Contains all vital centers (e.g., respiration, circulation). Loss of brainstem function leads to irreversible death. Medullary neurons, the most resistant to oxygen deprivation, indicate the condition of the entire brain. Minnesota Criteria for Brainstem Death (1971): No spontaneous movement. No spontaneous respiration for at least 4 minutes. Absent brainstem reflexes, including: Pupillary, corneal, ciliospinal, vestibulo-ocular, and gag/cough reflexes. EEG is not mandatory. Legal Framework in India (THOTA, 1994): The Transplantation of Human Organs and Tissues Act bases its guidelines on brainstem death for organ transplantation and prevention of organ trafficking. Certification of Brainstem Death: A board of four medical experts is required: The treating physician (RMP). The RMP in charge of the hospital. An independent RMP from an approved panel. A neurologist/neurosurgeon from an approved panel. Medicolegal Implications: Death certification relies on the confirmation of brainstem death. Ensures clarity in organ transplantation protocols and prevents premature declaration of death. Cause of Death The cause of death is the disease, injury, or combination of both that initiates the chain of events leading to death. It is categorized as follows: Immediate Cause of Death: The direct cause of death at the time of the terminal event. Example: Heart attack or respiratory failure. Antecedent (Basic) Cause of Death: The underlying pathological process leading to death. Example: Gunshot wound complicated by generalized peritonitis. Contributory Cause of Death: A pathological process or complication that contributes to, but does not directly cause, the terminal event. Example: Stomach carcinoma. Process of DEATH and its STAGES Death is Not an Event, It is a Process. How? In layman language, the end of the life of a per son is called death and there is a point of time at which death ocurs. There are three general crite ria on the basis of which a common man thinks another individual is dead: (1) loss of conscious ness, (2) loss of breathing and (3) loss of pulse/ heartbeat. So death appears to be or (is said to be) an'event in laymen language. From the scientific (forensic) point of view, death occurs in two stages, the first one being 'somatic 106 death' and second onebeing'moleculardeath.The meaning of death which the common man under. stands (as described earlier) is actually 'somatic death. Actually after somatic death, the blood sup. ply to the tissues and organs stops and so the cells in different parts of the body begin to die. Some cells die earlier and some cells take more time to die. So it is clear from this point that after somatic death, the cells of different tissues/organs remain alive for some time and this time differs from tissue to tissue. Molecular death This process in which the cells or tissuesor organs die slowly due to molecular damage result ing from deficiency of nutrition, oxygen or neuro hormonal control is known as 'molecular death. Ultimately, from this discussion, we conclude that death is not an event but a 'process. After somaic death, molecular death continues for 2-3 h and at the end of 2-3 h, complete molecular death occurs. This period of 2-3 h between somatic death and complete molecular death is called 'supravitu period' during which organs can be harvested tor transplantation. "The Transplantation of Hunu Organs and Tissues Act' in lndia regulates tne removal, storage and transplantation of hum organs and tissues for therapeutic purpose anu prevent the commercial dealing of the sanie Somatic Death (Clinical Death, Systemic Death) It is the immediate change atter death.>ol death is the complete and irreversible cessation & stoppage of the brain functions, circulation and respiration 1) irreversible cessation of brain / brain stem activity. Loss of consciousness, loss of both sensory and motor functions, loss of reflexes and loss of muscle tone. Pupils are widely dilated. 2) irreversible cessation/stoppage of the circulation 3) Ireversible cessation/stoppage of the respiration Reversible or not A patient suddenly loses his conscious ness, his heart stops working (i.e. flat ECG) and the lungs also stop working (i.e. no breathing). It is iust equivalent to the loss of tripod of life. We can not call it somatic death because we do not know whether the loss of these three functions is reversible or irreversible. Suppose we perform CPR and the person revives, we can say that the functions of all these three organs stopped working but revers ibly. Assume after CPR, the patient does not revive; it means that the functions of all these three organs stopped working irreversibly and thus, it is called somatic death the body is dead as a whole, but the biological properties of the component parts may still be demonstrable. The corneal reflex and pupillary reflex (to light) disappear at the time of death, but pupils reacts to atropine (causes dilatation/mydriasis up to 4h after death) and eserine (causes contraction/miosis up to 1 h after death). Eserine (Esere is the West African name for Calabar bean) is another name for physostigmine. After death, some cells in the body are still alive and even capable of movement (e.g. fibroblast, leucocytes). The muscles contract to mechanical/ electrical/thermal stimulus. The pupil responds to appropriate pharmacological stimuli. Zasco's phe -nomenon: When the lower tendon of quadriceps emoris muscle is hit by a hard blunt object, the muscle contracts and upward movement of patella can be observed. Idiomuscular reaction may be observed due to local bulging of biceps brachi muscle at the site where it is hit by a blunt hard object. The legal certification of depends on the diagnosis of somatic death. Somatic death is declared clinically when the three vital organs (heart, lungs and brain) fail to function and is confirmed by flat ECG, flat EEG and absence of breath. ALSO : Apparent death = suspended animation), hypothermia in old age or the coma following excess dose of sedatives/hypnotic. Molecular Death (Cellular Death) After somatic death, individual cells and tissues start to die; the time taken by individual cells and tissues to die is different, that is, some tissues die rapidly (E.g. nervous tissues die rapidly; vital centres of the brain die in about 5 min) and some tissues die later (e.g. muscles die after 2-4 h). Ganglionic cells are most sensitive to anoxia, so they die rapidly; connective tissue being least sensitive to anoxia, die slowly. Molecular death is the death of cells and tissues individually; it takes place usually 1 or 2 h after the stoppage of the vital functions, but generally molecular death is not complete before 2-4 h of somatic death. MD HAPPENS PIECEMEAL Molecular death can be confirmed by absence of any response to an electrical/chemical/thermal stimulus in the tissues. Molecular death occurs piecemeal (i.e. a person dies in bits and pieces), so death is a process, not an event. Individual cells will live on their residual oxygen for a variable time after circulation has stopped. When the O2, reserve in the cells gets depleted, cellular/molecular death sets in. O2, deficiency leads to metabolic dysfunction which then leads to structural disintegration. TRANSPLANTATION WINDOW BIomedical innovations (e.g. bypass machines, mechanical respirators, resuscitators, cardiac pacemakers and so on) have helped to maintain the circulation of oxygenated blood to brainstem, thereby prolonging life. Organ transplantation depends on the persistence ot the properties of living matter as we die in bits and pieces, that is, before molecular death sets in. Various tissues can be removed from the dead body at various intervals of time BEATING HEART DONOR A donor in whom brainstem death is established but is kept on ventilator to facilitate O2, Supply so as to keep alive the body organs tor the Purpose of organ transplantation is known as 'liv ng cadaver' or 'beating heart donor. TABLE : Body Tissues and Their Removal Within a Limited Time for Organ Transplantation Organs/Tissues: time to recover Liver : 15 min Kidneys : 45 min Heart : 1 h Cornea: 6h Skin : 24 h (1 day) Bone: 48 h (2 days) Blood vessels: 72 h (3 days) Manner of Death Refers to the circumstances surrounding the cause of death. It can be: Natural: Resulting from disease. Unnatural: Includes accidental, homicidal, or suicidal causes. Obscure: Uncertain or unknown causes. Mechanism of Death The mechanism of death is the physiological or biochemical disturbance caused by the cause of death, which ultimately leads to death. Example: Septicemia, hemorrhage, or cardiac arrhythmias.

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