By Bhagavan Sri Ramana Maharshi, Sri M. Sivaprakasam Pillai, Dr. T. M. P. MAHADEVAN
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Capillary closing pressure (CCP) – the point at which external pressure on the capillary exceeds internal pressure and the structural strength of the vessel and causes capillary collapse. Generally quoted as 32 mmHg in healthy individuals. Tissue interface pressure (TIP) – the pressure applied to the epidermis by the surface that is supporting it. TIP = Patient Weight/Surface Area Supported TIP does not equal CCP, there is no conversion constant as it is not directly proportional. Both measurements are influenced by multiple variables such as: amount of fatty tissue, relative location of bony prominences, vertical and horizontal shearing forces, vascular circulation, systemic blood pressure, general health.
The warmed air creates a dry environment decreasing the effects of perspiration, incontinence and copious wound drainage. The support surface can be stabilised if required for some procedures by turning off the air flow 165. Air fluidised beds can be costly and the floating properties make handling the patient difficult. The high air loss ‘dry flotation’ system can potentially have a dehydrating effect on the individual. 8 Turning beds There are a variety of beds or devices that assist in turning the patient.
1995; 273:865-870.
