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Various causes of acute peripheral ischemia are:
Allergic vasculitis
Compartment syndrome
Direct compression
Frostbite
Post vascular surgery
Radiation vasculitis
Thromboembolism
Vascular disease

CRUSH INJURY

A crush injury is defined as:

Two or more tissues must be involved
The injury must be severe enough to render the viability of the tissues questionable
Severity of injury varies from minimal to irreversible with a partially viable gray zone between the two.

ROLE OF HYPERBARIC OXYGEN IN TREATMENT

Hyperberic Oxygen is an ideal adjuvant to the basic treatment for the following reasons:

It counteracts the tissue hypoxia by elevating tissue PO2
It reduced edema by vasoconstriction and reduction of blood flow
It promotes wound healing
It prevents infection