Asphyxia Deaths: Hanging, Strangulation & Drowning Signs

Asphyxia is death from interference with the body's oxygen supply - by blocking the airway, compressing the neck, or filling the lungs with fluid. In forensic medicine, hanging, strangulation, and drowning are its three classic violent forms, and telling them apart decides whether a death was suicide, homicide, or accident.

These distinctions matter enormously in court. A ligature mark's angle can separate suicidal hanging from homicidal ligature strangulation; fingertip bruises point to throttling; and diatoms in the bone marrow can prove a body drowned while alive rather than being dumped after death. The forensic pathologist reads the neck and the lungs like a record of the final minutes.

Key Concepts

• Hanging: suspension of the body by a ligature around the neck; the mark is typically oblique, incomplete (high at the back where the knot lifts), and parchment-like.
• Ligature strangulation: constriction by a cord without suspension; the mark is usually transverse and complete around the neck.
• Manual strangulation (throttling): compression by hands; shows fingertip bruises, nail abrasions, and deep internal injuries.
• Drowning: submersion deaths; fresh water causes haemodilution and red-cell bursting, salt water draws fluid into the lungs; both leave heavy, waterlogged lungs.
• Tardieu spots: tiny petechial haemorrhages on organs from raised venous pressure, seen in asphyxia.
• Diatom test: microscopic algae from the drowning medium found in bone marrow prove circulation was active during submersion.
• Froth at mouth and nose: fine white froth (champignon de mousse), a classic drowning sign.

How It Works

Asphyxial death runs through stages: first dyspnoea with struggle, then convulsions as the brain starves, then exhaustion and stillness, and finally terminal apnoea. In hanging, the ligature compresses the jugular veins first, then the carotid arteries, and consciousness is lost within seconds when arterial flow stops. In drowning, water inhaled after the first gasp washes out surfactant, the lungs fill with oedema fluid, and oxygen can no longer cross into blood.

Worked Example

At autopsy, the right lung weighs 700 g and the left 680 g. Normal adult lungs weigh about 350 g each. The right lung is 700 / 350 = 2 times normal weight, and the left 680 / 350 = 1.94 times, roughly double. Both lungs are heavy, pitting, and ooze frothy fluid on section - the waterlogged lungs of drowning. Had the body merely been dumped after death elsewhere, the lungs would weigh near normal and no diatoms would reach the marrow.

Common Misconceptions

• Hanging is always homicide. The great majority of hangings are suicidal; homicidal hanging is rare and usually betrayed by signs of struggle or a transverse mark.
• Every drowning victim has water in the stomach. Not always - laryngeal spasm can cause death with little water inhaled, and the diagnosis then rests on other signs and diatoms.
• Petechiae prove strangulation. Tardieu spots occur in many asphyxial deaths, including hanging and drowning, so they support asphyxia generally, not one method specifically.

Real-World Applications

• Medicolegal autopsy determines cause and manner of death for the courts.
• Ligature-mark analysis distinguishes suicidal hanging from homicidal strangulation.
• The diatom test confirms ante-mortem drowning in decomposed bodies.
• Crime-scene findings are correlated with autopsy signs to reconstruct events.

Hanging leaves an oblique, incomplete mark; ligature strangulation a transverse, complete one; throttling leaves the imprint of hands; drowning leaves heavy lungs, froth, and diatoms. Read together, these signs let the pathologist separate suicide from homicide and drowning from disposal.