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Excessive external pressure applied locally to the skin overlying the thin subcutaneous tissue is known to cause ischaemic damage,i,e. ,skin necrosis and decubitus ulcer.In order to investigate the effect of externally applied pressure on the circulation to the skin with and without the underlying muscle,we used the changes in transcutaneous P02 of the lateral and medial sides of the lower legs in a group of five normal subjects.External pressure is applied by means of a rectangular air bag (7 c 15 cm) that is attached over the transcutaneous P02 sensor with adhesive tapes.The air bag was connected to manually pressure-controlled air source.The pressure within the air bag was continuously monitored using a mercury manometer. In each subject,increasing external pressure produced a reduction in transcutaneous P02.The amount of reduction of transcutaneous P02 for a given applied pressure was dramatically greater in lateral sides as compared with medial sides.These results indicate that skin circulation without the underlying muscle is more readily compromised by external compression than with the underlying muscle.

The Effect of Externally Applied Pressure on the Circulation to the Skin with and without Underlying muscle as Reflected by Transcutaneous PO2