What is the defining feature of a strangulated hernia?

A strangulated hernia is characterized by the loss of blood supply to the herniated tissue due to pressure from surrounding structures. This occurs when the hernia, which is an abnormal protrusion of tissue through a defect or weakness in the abdominal wall, becomes trapped in such a way that the blood vessels supplying it are compressed. This can lead to tissue necrosis if not treated promptly. The vital point here is that the strangulation means the tissue cannot receive adequate blood flow, which is why timely medical intervention is crucial.

In contrast, the ability to push a hernia back into the body cavity or a hernia being reducible within a certain timeframe typically refers to an uncomplicated hernia, not one that is strangulated. Spontaneous reduction is also an indication of a non-strangulated hernia, where the protruding tissue can return to its original position without intervention. Thus, the defining characteristic of a strangulated hernia hinges on the loss of blood supply due to compression, making it a surgical emergency.