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[Self-injury with liquid nitrogen]

W Marty¹, T Sigrist, W Bär

¹Institut für Rechtsmedizin, Universität Zürich.

Zeitschrift Fur Unfallchirurgie Und Versicherungsmedizin : Offizielles Organ Der Schweizerischen Gesellschaft Fur Unfallmedizin Und Berufskrankheiten = Revue De Traumatologie Et D'Assicurologie : Organe Officiel De La Societe Suisse De

|January 1, 1993

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Liquid nitrogen spills on limbs do not cause deep freezing or necrosis. Even 40-second immersion only causes superficial freezing, with rapid thawing, suggesting self-infliction for severe injuries.

Area of Science:

Forensic pathology
Cryobiology
Trauma analysis

Background:

Investigated the potential for lower leg and foot necrosis from a single accidental liquid nitrogen spill.
Examined the thermal effects of liquid nitrogen exposure on human cadavers.

Observation:

Pouring liquid nitrogen on a limb caused superficial frost but no internal temperature drop.
40-second immersion in liquid nitrogen froze the skin, with only a minor internal temperature decrease.
Exposed limbs thawed within 5-8 minutes after removal from liquid nitrogen.

Findings:

Accidental, single-instance liquid nitrogen spills are unlikely to cause deep tissue necrosis.
Observed rapid thawing indicates limited thermal damage from brief exposures.
The case suggests prolonged direct contact, indicative of self-infliction, for severe injury.

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Implications:

Challenges the assumption of accidental injury in cases of severe cold-related tissue damage.
Highlights the need for careful assessment in forensic investigations involving liquid nitrogen.
Provides evidence for distinguishing accidental exposure from intentional self-harm.