Pressure sores usually occur when external pressure exceeds capillary occlusive pressure over: (A) 20 mmHg, (B) 25 mmHg, (C) 30 mmHg, (D) 35 mmHg
Answer is C. When external pressure exceeds the capillary occlusive pressure over 30mmHg, blood flow to skin ceases leading to tissue anoxia, necrosis and ulceration. Ref: Bailey and love 27th edition Pg no: 29