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Related Experiment Video

Updated: Jul 18, 2026

Real-time Video Projection in an MRI for Characterization of Neural Correlates Associated with Mirror Therapy for Phantom Limb Pain

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The immersion foot syndrome. 1946.

C C Ungley, G D Channell, R L Richards

Wilderness & Environmental Medicine

|June 27, 2003

Summary

Prolonged exposure to cold causes immersion foot, a syndrome with distinct stages from vasoconstriction to nerve damage. Early recognition and appropriate treatment, avoiding rapid warming, are crucial for managing this condition.

Area of Science:

This study falls under the domain of environmental medicine and physiology, focusing on the effects of cold exposure on the human body.

Background:

Prolonged exposure of extremities to cold, without causing freezing, leads to a specific syndrome often inaccurately termed 'immersion foot'.
The syndrome encompasses distinct clinical features, etiology, pathology, prevention, and treatment strategies, with a detailed discussion on its pathogenesis.

Discussion:

The natural history involves four stages: exposure, pre-hyperemic, hyperemic, and post-hyperemic, characterized by changes in temperature, swelling, pain, and blood flow.
Pathogenesis involves intense vasoconstriction during exposure, followed by vasodilator metabolite release causing hyperemic swelling and pain. Peripheral nerve damage manifests in later stages.
Cold-sensitivity and hyperhidrosis are observed in the chronic phase, with underlying mechanisms requiring further investigation. Severe cases may present with superficial gangrene.

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Use of a Foot-Induced Digitally Controlled Resistance Device for Functional Magnetic Resonance Imaging Evaluation in Patients with Foot Paresis

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Key Insights:

Immersion foot progresses through distinct phases: initial vasoconstriction, followed by hyperemic swelling and pain, and later nerve damage with sensory and motor disturbances.
Peripheral nerve damage is evident in the post-hyperemic stage, leading to sensory disturbances, altered sweating, and muscle atrophy.
Cold sensitivity and hyperhidrosis characterize the chronic stage, with prognosis correlating to the severity of anesthesia observed early on.

Outlook:

Avoid rapid warming of chilled extremities; cold therapy is beneficial for pain relief during the hyperemic stage but contraindicated in the pre-hyperemic phase.
Interventions like sympathectomy are not recommended immediately post-rescue but may be considered for managing the chronic cold-sensitive state.
Further research is needed to fully elucidate the mechanisms behind cold-sensitivity and hyperhidrosis in the later stages of immersion foot.