Hanging in fmt
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Hanging FMT Fundamentals of Music Technology Gautam Biswas
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Hanging forensic medicine Gautam Biswas notes asphyxia types mechanisms
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hanging ligature mark cause of death hyoid fracture postmortem findings forensic Gautam Biswas
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Hanging - FMT Notes (Gautam Biswas)
Definition
Hanging (self-suspension) is a form of asphyxia caused by suspension of the body by a ligature which encircles the neck, where the constricting force is at least part of the weight of the body.
Classification
A. Based on Position of the Knot
| Type | Description |
|---|---|
| Typical | Knot is at the nape of neck (occiput) - point of suspension directly over the occiput |
| Atypical | Knot is anywhere other than the occiput (submental, subaural, lateral, etc.) |
B. Based on Degree of Suspension
| Type | Description |
|---|---|
| Complete hanging | Body is fully suspended - no part touches the ground. Constricting force = full body weight |
| Incomplete / Partial hanging | Lower part of body touches the ground (toes, feet, sitting, kneeling, lying, prone). Constricting force = weight of the head only |
Key point: Even partial/incomplete hanging is lethal - the weight of the head alone is sufficient.
Mechanism of Death
Four mechanisms may operate singly or together:
- Asphyxia - Compression of airway (trachea) obstructs breathing
- Venous obstruction - Jugular veins compressed → cerebral venous congestion → unconsciousness
- Arterial occlusion - Carotid arteries compressed → cerebral ischemia
- Vagal inhibition - Pressure on carotid sinus → reflex cardiac arrest (may cause sudden death)
Venous obstruction is the most common mechanism. Only ~15 lbs pressure is needed to compress jugular veins; ~33 lbs for carotids; ~66 lbs for vertebral arteries.
Manner of Death
- Suicidal - Most common
- Accidental - Children (playing cowboy, lasso, playground equipment), autoerotic hanging in adults
- Homicidal - Rare; possible in children or intoxicated/incapacitated individuals
- Lynching - Homicidal hanging by a mob (historically prevalent against minorities in North America)
Postmortem Findings in Hanging
External Findings
Face:
- Swollen, cyanosed face (impaired venous return)
- Prominent eyeballs (passive blood accumulation)
- Dilated pupils (if knot presses cervical sympathetic - la facie sympathetique - indicates antemortem hanging)
- Sub-conjunctival hemorrhages
- Protrusion of tongue - usually swollen and blue, due to ligature pressure on floor of mouth
Other external:
- Bleeding from sites; discharge of semen, urine, or fecal matter
- Ocular/facial petechiae, congestion, cyanosis
- Salivary dribbling mark on chest (antemortem sign)
Ligature Mark (The Most Important Finding)
| Feature | Hanging | Strangulation |
|---|---|---|
| Position | Oblique, goes upward toward knot | Horizontal, encircles neck completely |
| Completeness | Incomplete - gap at knot site | Complete - goes all around |
| Direction | Upward and backward toward knot | Horizontal |
| Depth | Deeper on side away from knot | Uniform throughout |
| Abrasion collar | Present | Present |
| Parchmentization | Present (dry, yellow-brown, hard) | Less prominent |
Internal Findings
- Ligature groove - subcutaneous tissues show hemorrhage/ecchymosis
- Neck vessels - intimal tears (carotid); Simon's hemorrhage (intervertebral disc hemorrhage - pathognomonic in judicial hanging)
- Hyoid bone fracture - uncommon in hanging (~2-21% cases), more common in strangulation. More likely in elderly (ossified hyoid)
- Thyroid/cricoid cartilage fracture - may occur
- Cervical spine - fracture-dislocation of C2-C3 (hangman's fracture) in judicial hanging specifically
- Brain - congestion, petechiae
- Lungs - congested, petechiae; emphysematous bullae may form
- Esophagus/trachea - submucosal hemorrhage or petechiae
Judicial Hanging
- Knot placed submental (under chin) or subaural (below the ear)
- Drop = at least the height of the victim (5-7 feet)
- Cause of death = fracture-dislocation of C2 from C3 (rarely C3-C4) - cervical spine fracture, not asphyxia
- Also called "long drop" hanging
Antemortem vs. Postmortem Hanging
| S.No. | Feature | Antemortem | Postmortem |
|---|---|---|---|
| 1 | Salivary dribbling mark | Present | Absent |
| 2 | Fecal/urinary stains | May be present | Absent |
| 3 | Ligature mark | Parchmentized, brownish | Pale, not parchmentized |
| 4 | Subcutaneous hemorrhage in groove | Present | Absent |
| 5 | Vital reaction | Present | Absent |
| 6 | Petechiae on face | May be present | Absent |
| 7 | Pupils (la facie sympathetique) | Dilated on knot side | Normal |
Hanging vs. Strangulation (Differentiation)
| Feature | Hanging | Strangulation |
|---|---|---|
| Manner | Usually suicidal | Usually homicidal |
| Ligature mark position | Oblique, going upward | Horizontal |
| Ligature mark completeness | Incomplete (gap at knot) | Complete |
| Asphyxia signs (petechiae) | Less pronounced | More pronounced |
| Hyoid fracture | Less common | More common |
| Neck muscle hemorrhage | Less | More |
Autoerotic (Sexual) Asphyxia
- Typically accidental hanging
- Self-induced partial asphyxia for sexual arousal
- Usually found with evidence of sexual activity
- Often misidentified as suicide
High-yield exam points:
- Only ~15 lbs needed to compress jugular veins - explains why partial/incomplete hanging is fatal
- Knot position determines typical vs. atypical hanging
- Ligature mark is oblique and incomplete in hanging
- Simon's hemorrhage = pathognomonic of judicial hanging
- Hyoid fracture is rare in hanging, more common in manual strangulation
- La facie sympathetique = dilated pupil on side of knot = antemortem sign
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Gautam Biswas FMT hanging internal findings Simon's hemorrhage ligature mark features antemortem postmortem table
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Hanging - FMT Notes (Gautam Biswas)
Definition
Hanging (self-suspension) is a form of asphyxia caused by suspension of the body by a ligature which encircles the neck, where the constricting force is at least part of the weight of the body.
Classification
A. Based on Position of the Knot
| Type | Description |
|---|---|
| Typical | Knot at the nape of neck (occiput) - point of suspension placed centrally over the occiput |
| Atypical | Knot placed anywhere other than the occiput (submental, subaural, lateral, frontal, etc.) |
Most suicidal hangings are atypical.
B. Based on Degree of Suspension
| Type | Description | Constricting Force |
|---|---|---|
| Complete | Body fully suspended, no part touches ground | Full body weight |
| Incomplete/Partial | Part of body touches ground (toes, feet, sitting, kneeling, lying, prone) | Weight of head only |
Key point: Even the weight of the head alone (~5-6 kg) is sufficient to cause death - partial hanging is equally fatal.
Mechanism of Death (4 mechanisms - may act alone or together)
- Asphyxia - Compression of trachea obstructs the airway
- Venous obstruction - Jugular veins compressed → cerebral venous congestion → unconsciousness rapidly
- Arterial occlusion - Carotid arteries compressed → cerebral ischemia
- Vagal inhibition - Pressure on carotid sinus → reflex cardiac arrest (sudden death even before asphyxia develops)
Pressure needed: ~15 lbs to compress jugular veins; ~33 lbs for carotid arteries; ~66 lbs for vertebral arteries. This explains why partial hanging is lethal.Venous obstruction is the most common mechanism.
Manner of Death
| Manner | Details |
|---|---|
| Suicidal | Most common |
| Accidental | Children (playing cowboy, lasso, playground); adults (autoerotic/sexual asphyxia) |
| Homicidal | Rare; possible in children, intoxicated, or incapacitated individuals |
| Lynching | Homicidal hanging by a mob; historically prevalent in North America |
Postmortem Findings in Hanging
External Findings
1. Face:
- Swollen, cyanosed (impaired venous return + blood accumulation)
- Prominent eyeballs (passive blood accumulation increases pressure)
- Dilated pupils - if knot presses cervical sympathetic, eye on same side stays open with dilated pupil = la facie sympathetique - indicates antemortem hanging
- Sub-conjunctival hemorrhages
- Tongue protrudes - swollen and blue (pressure on floor of mouth by ligature)
2. Other external:
- Bleeding from body orifices; discharge of semen, urine, or feces
- Ocular/facial petechiae, congestion, cyanosis
- Salivary dribbling mark on chest/chin (important antemortem sign)
The Ligature Mark (Most Important Finding)
Site: Usually above the thyroid cartilage (~75% of cases), at the level of thyroid cartilage (~15%), below thyroid cartilage (~10%)
Characteristics of the groove:
- Oblique - runs upward toward the point of suspension (knot)
- Incomplete - does not encircle the neck completely; there is a gap at the knot
- Deeper on the side opposite to the knot (greatest force applied there)
- Parchmentized - dry, yellow-brown, hard, leathery (from pressure + drying)
- Underlying subcutaneous tissue is dry, white, firm, and glistening
- Imprint/pattern of ligature material may be visible in the furrow
Factors affecting ligature mark:
- Harder/thinner ligature → deeper, narrower, more distinct mark
- Softer/wider ligature → shallower, broader mark
- Longer suspension → deeper, more prominent, more parchmentized
- Complete suspension → more prominent than partial
- Heavier body → more marked impression
- Slipping of ligature during suspension → double impression
Antemortem hanging triad (Gautam Biswas):
- Streaks/bands of reddened or pink tissue
- Imprint of ligature pattern in the furrow
- Sloping/upward angle toward suspension point
Internal Findings
Neck:
- Subcutaneous tissue under the mark: dry, white, firm, glistening
- Platysma and sternomastoid may show hemorrhages, sometimes ruptured
- Hyoid bone fracture - uncommon; more common in persons above 40 years (ossified hyoid), especially with thin ligature
- Thyroid and cricoid cartilage fractures possible
- Carotid intimal tears - especially with deep, thin ligature materials
- Contusions at root of tongue and floor of mouth
- Ecchymosis, petechiae, or edema in laryngeal mucosa
Lungs:
- Congested, distended, emphysematous
- Tardieu's spots (subpleural petechial hemorrhages)
- Cut surface exudes frothy fluid/blood (if constriction at end of expiration)
- Pale with little congestion (if constriction at end of inspiration)
Heart:
- Congested
- Tardieu's hemorrhagic spots over pericardium
- Right side, pulmonary artery, vena cava - full of dark fluid blood
- Left side - empty
Brain:
- Congested membranes and parenchyma
- Petechiae
Esophagus/larynx-trachea:
- Submucosal hemorrhage or petechiae
- Mucosal injuries
Judicial Hanging
- Knot placed submental (under chin) or subaural (below the ear)
- Drop = at least height of the victim (5-7 feet)
- Ligature causes a forceful, jerky impact at the end of the fall
- Cause of death = fracture-dislocation of C2 from C3 (rarely C3-C4) - NOT asphyxia
- Simon's hemorrhage = hemorrhage into intervertebral disc - pathognomonic of judicial hanging
Antemortem vs. Postmortem Hanging
| S.No. | Feature | Antemortem Hanging | Postmortem Hanging |
|---|---|---|---|
| 1 | Salivary dribbling mark | Present | Absent |
| 2 | Fecal/urinary stains | May be present | Absent |
| 3 | Ligature mark | Parchmentized, brownish, prominent | Pale, soft, not parchmentized |
| 4 | Subcutaneous hemorrhage in groove | Present | Absent |
| 5 | Vital reaction at mark (microscopy) | Present | Absent |
| 6 | Petechiae on face/eyes | May be present | Absent |
| 7 | La facie sympathetique (dilated pupil) | Present (if knot on cervical sympathetic) | Absent |
| 8 | Point of suspension | Compatible with self-suspension | Often not compatible |
| 9 | Emphysematous bullae on lungs | Absent | Present |
Hanging vs. Strangulation (Differentiation)
| Feature | Hanging | Ligature Strangulation |
|---|---|---|
| Manner of death | Usually suicidal | Usually homicidal |
| Ligature mark direction | Oblique (upward toward knot) | Horizontal/transverse |
| Ligature mark encirclement | Incomplete (gap at knot) | Complete (encircles neck fully) |
| Ligature mark site | Above thyroid cartilage (75%) | At or below thyroid cartilage |
| Subcutaneous tissue | Dry, white, glistening | Shows extravasation of blood |
| Asphyxia signs (petechiae, cyanosis) | Less pronounced | More pronounced |
| Hyoid bone fracture | Less common | More common |
| Neck muscle hemorrhage | Less | More |
| Constricting force | Body's own weight | External force (not body weight) |
Autoerotic (Sexual) Asphyxia
- Accidental partial self-suspension for sexual arousal/enhancement of orgasm
- Usually males, found in private setting
- Evidence of sexual activity present at scene
- Often misidentified as suicide at initial scene examination
High-Yield Exam Points (MCQ Focus)
- Only ~15 lbs pressure compresses jugular veins - explains lethality of partial hanging
- Ligature mark in hanging is oblique and incomplete (this differentiates it from strangulation)
- Typical hanging = knot at occiput/nape; atypical = knot anywhere else
- La facie sympathetique = antemortem sign
- Simon's hemorrhage = pathognomonic of judicial hanging
- Hyoid fracture = more common in manual strangulation than hanging; in hanging, more common above age 40
- Cause of death in judicial hanging = cervical spine fracture (C2-C3), not asphyxia
- Incomplete ligature mark = hanging; complete = strangulation (Exam Q: "Incomplete ligature mark is NOT a feature of ligature strangulation")
- Emphysematous bullae on lungs = postmortem hanging sign
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