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A common misconception among employers is that simply keeping workers safe from an impact injury during a fall event is sufficient. A timely rescue is often overlooked when securing fall protection equipment and developing a fall protection plan. Unfortunately for the suspended employee waiting for rescue, there is a very serious life-threatening risk - suspension trauma.
Suspension trauma is a form of orthostatitic intolerance. Orthostatic intolerance is the body's blood-flow reaction to being immobile in an up-right position. When suspended after a fall, the worker is forced into an upright position with his/her legs hanging. Throughout the duration of the suspension blood accumulates in the legs. This is also known as venous pooling and its risk increases over time. The accumulation of too much blood in the veins of a worker's legs results in reduced blood (and therefore oxygen) to the heart and brain. Although this can occur in any upright immobile scenario, the legs straps on a harness expedite this process through the pressure and compression applied by the leg straps.
The first sign of orthostatic intolerance is often dizziness and loss of consciousness. When this occurs to someone in a standing position on the ground, the faint naturally restores a horizontal position, therefore helping to normalize blood flow. During a fall event, however, the harness keeps the worker upright. When a worker faints during suspension, circulation is not restored. Because of this, responding to a fall event needs to occur very quickly. Establishing a rescue plan as part of the greater fall protection plan is essential. Without an emergency response time, the results can be fatal in as quickly as thirty minutes.
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