Q3 LONG ANSWER 10M ★ High-yield

Describe strangulation with its varieties and findings. Distinguish it from hanging.

Forensic Medicine · 2nd Professional — Para-Clinical

Definition and Varieties

Strangulation is a form of asphyxial death produced by constriction of the neck by a force other than the weight of the body.

Variety	Description
Ligature strangulation	Constriction by a ligature tightened by a force other than body weight — a rope, cord, wire, scarf, dupatta or item of clothing
Throttling (manual strangulation)	Constriction by the hands — one hand, both hands, or the fingers and thumb. Always homicidal, since a person cannot throttle themselves: consciousness is lost within seconds and the grip relaxes
Mugging (yoking, chokehold)	Constriction by the forearm or the bend of the elbow from behind; leaves little OR NO external mark, so the diagnosis rests on the deep neck findings
Garrotting	Sudden constriction by a ligature applied from behind without warning; historically a method of execution in Spain and of robbery in India
Bansdola	An INDIAN method in which the neck is compressed between two sticks or bamboos, one in front and one behind, tied at the ends — leaving two transverse marks front and back
Palmar and knee pressure	The neck compressed with the palm, foot or knee against the ground; may leave few marks and cause fractures

Findings in Ligature Strangulation and Throttling

Feature	Ligature strangulation	Throttling (manual)
Mark on the neck	A single transverse (horizontal) mark, continuous and completely encircling the neck, low — at or below the thyroid cartilage, and of uniform depth all round	NO ligature mark. Instead, crescentic nail abrasions and rounded finger-tip bruises on the sides and front of the neck, irregularly grouped
Direction of the nail marks	—	The concavity of a crescentic abrasion faces the direction from which the pressure came, indicating the position of the assailant's hand
Face and eyes	Markedly congested and cyanosed, with abundant petechiae in the conjunctivae, eyelids and face — because the venous return is obstructed while arterial inflow continues	The same, and often more marked
Deep neck structures	Bruising of the strap muscles beneath the mark	Extensive bruising of the strap muscles, deeper and more irregular
Hyoid and thyroid	Fracture less common than in throttling	Fracture of the hyoid (greater cornu) and of the superior cornu of the thyroid cartilage is common — the classical finding, and much commoner than in hanging
Manner	Usually homicidal; occasionally suicidal (requiring a tourniquet or multiple knots to maintain pressure after consciousness is lost); and accidental, as when a sari or scarf is caught in machinery	Invariably homicidal

CLINICAL PEARL

Throttling is always homicide, and the reason is simply timing. Consciousness is lost within 10 to 15 seconds of the carotids being occluded, and the hands relax at once. Nobody can maintain their own grip long enough to kill themselves. A ligature is different — a knot or a tourniquet holds the pressure after the person is unconscious — which is why suicidal ligature strangulation is possible and suicidal throttling is not.

Hanging Compared with Strangulation

Feature	Hanging	Ligature strangulation
Constricting force	The weight of the body	An external force other than body weight
Direction of the mark	Oblique, running upward toward the knot	Transverse (horizontal)
Continuity	Non-continuous — a gap beneath the knot	Continuous, completely encircling
Level on the neck	High, above the thyroid cartilage	Low, at or below the thyroid cartilage
Depth of the mark	Deepest opposite the knot; unequal	Uniform all round
Face	Pale in typical hanging; congested in atypical	Always markedly congested, cyanosed and swollen
Petechiae	Few or absent in typical hanging	Abundant
Saliva	Dribbling from the angle of the mouth — characteristic	Usually absent
Neck muscle bruising and cartilage fracture	Uncommon	Common
Injuries elsewhere and defence wounds	Usually absent	Often present — signs of a struggle
Usual manner	Suicidal	Homicidal

Suicidal and Homicidal Ligature Strangulation

Strangulation is homicidal in the great majority of cases, and throttling invariably so
Suicidal ligature strangulation is possible but uncommon, and requires a mechanism to maintain the pressure after consciousness is lost — a tourniquet twisted with a stick or rod, multiple turns and knots, or a ligature attached to a fixed point. Where such a mechanism is present and there are no other injuries, suicide is sustainable
Findings favouring suicide — a tourniquet or several tight knots; the ligature still in place and knotted at the front where the hands could reach; NO defence injuries; a psychiatric history or a note; a secured room; and no disturbance
Findings favouring homicide — defence injuries on the hands and forearms; grip bruises on the arms; a ligature knotted at the back of the neck; other injuries; evidence of a struggle at the scene; disarranged clothing; and the ligature absent
Accidental strangulation — a sari, dupatta, scarf or long hair caught in machinery, which is a recognised industrial and domestic accident in India; a child entangled in a cot rail or cord; and sexual asphyxia
The classical trap remains strangulation followed by suspension to simulate suicide, detected by the second mark and the absence of the vital signs of hanging

Applied Aspects

Dissect the neck in a bloodless field after the head and chest are drained; this is nowhere more important than in strangulation, where the artefactual haemorrhage produced by opening the neck first is indistinguishable from the genuine finding and could convict an innocent person
Record the orientation of every nail mark; the concavity indicates the direction of pressure and therefore the position of the assailant, which may support or contradict an account
Examine the hyoid and both superior thyroid cornua carefully, and confirm any fracture histologically for a vital reaction; a hyoid may also be fractured accidentally during removal, which is an autopsy artefact
Remember the hyoid is not fractured in the young, whose greater cornua are cartilaginous and flexible; its integrity therefore excludes nothing in a young person
Take nail scrapings and swab the neck for DNA in every suspected throttling; the assailant gripped the neck and may have left material there
Suspect mugging where there are few external marks but deep neck bruising and abundant petechiae; the forearm spreads the force and leaves little on The hyoid does not fracture in the young, whose greater cornua are cartilaginous; state this qualification in every report on a young person
A tourniquet or multiple knots makes suicide sustainable, because the pressure is maintained after consciousness is lost
Bansdola leaves two transverse marks, front and back, from the sticks compressing the neck between them
Strangulation gives abundant petechiae and hanging often none, because the arteries stay open in the first and are occluded in the second
Look for a struggle — defence injuries, disarranged clothing, disturbance at the scene — present in strangulation and absent in hanging
Throttling is invariably homicidal, because consciousness is lost in ten to fifteen seconds and the grip relaxes at once
Garrotting is sudden constriction from behind, historically used in robbery and giving no warning and no defence injuries
Mugging leaves little on the skin but deep bruising and abundant petechiae; the diagnosis rests on the neck dissection
Swab the neck for DNA before touching it; the assailant gripped it and may have left material there
Confirm any cartilage fracture histologically; removal artefacts are common and non-union of a cornu is a normal variant
Ligature strangulation is usually homicidal, though a tourniquet arrangement makes suicide sustainable and must be looked for
The skin

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