Suspension trauma is a serious medical condition that arises when a worker remains hanging motionless in a harness after a fall is arrested, and it can become life-threatening within minutes. Even if the fall is successfully arrested, as the person stays suspended, blood pools in the legs (venous pooling), blood flow to the heart and brain decreases, and loss of consciousness or even death can occur. This is why, in work at height, having a rescue plan ready in advance to quickly retrieve a fallen worker is just as essential as having a fall arrest system.

In this article, we explain why suspension trauma is so dangerous, the symptoms by which it progresses, and why an effective rescue plan saves lives.

What Is Suspension Trauma?

Suspension trauma is also known as orthostatic intolerance, suspension syndrome, or harness hang syndrome. It occurs when, after a fall, a worker remains suspended in an upright and motionless position in a harness.

The mechanism works as follows: The leg straps of the harness press against the main veins in the legs. Due to immobility and gravity, blood pools in the legs. This pooling reduces the amount of blood returning to the heart; therefore, blood flow to the brain, heart, lungs, and kidneys drops. Vital organs that do not receive enough oxygen are affected within a short time.

The critical point is this: This condition can develop independently of the fall itself, even if the person is not injured. In other words, the system that arrested the fall may have worked and the person may have survived; but every minute spent suspended creates a new danger.

How Fast Does Suspension Trauma Develop?

This is the most important factor that makes suspension trauma so dangerous. Symptoms can begin within a few minutes, and in some cases loss of consciousness can occur in as little as seven minutes.

Widely cited safety sources state that suspension can be fatal within the first half hour. However, “30 minutes” is not a safe period but an upper-limit warning; actual symptoms can begin much earlier. This is why rescue plans must be based on “prompt” rescue.

The speed of onset varies from person to person and depends on factors such as body type, harness fit, system design, and environmental conditions.

Symptoms of Suspension Trauma

The following symptoms are frequently observed in a suspended worker:

• Faintness, dizziness, and nausea
• Sweating and pale, greyish skin
• Breathlessness and impaired vision
• Abnormally high or low heart rate
• Low blood pressure
• Loss of consciousness

These symptoms are links in a life-or-death chain; when the first signs appear, seconds matter, not minutes.

Why Is a Rescue Plan a Legal and Vital Necessity?

In work at height, a rescue plan is not an optional measure. Legislation requires that matters relating to falls from height be included in the emergency plan, and that work be carried out under the supervision of a competent person. An effective rescue plan must include retrieving the person to a safe place as soon as possible and calling for emergency medical assistance.

The essential elements that a good rescue plan must include:

• Speed: It must be possible to reach the fallen person within minutes. The plan must focus on minimizing the suspension time.
• Site-specific design: Each work area has different hazards; a one-size-fits-all plan is not enough.
• Trained team and equipment: Those performing the rescue must be trained; tools such as descent/lifting equipment, rescue winches, and tripods must be ready.
• Drills: The plan must not stay on paper; it must be rehearsed regularly.
• Medical bridge: The rescued person must be directed to a medical evaluation in every case, even if there is no visible injury.

A fatal mistake commonly encountered in the field is this: the fall arrest equipment is present, but there is no rescue plan. In this case, the system arrests the fall, but the person remains suspended, and the real danger begins there.

What to Consider When Treating the Rescued Person

The risk continues even after the suspended person is rescued. For this reason, a few basic principles are important:

• Reach the person as soon as possible and bring them down to safe ground; if rapid descent is possible, bring them down without delay regardless of the situation.
• Call for professional medical help immediately and be sure to inform the arriving team that the person was suspended.
• If the person is conscious and rapid descent is not possible, moving their leg muscles during the waiting period (pressing their feet against a surface or moving them) can help reduce blood pooling.
• The rescued person must always be evaluated by a healthcare professional, even if there is no visible injury; delayed effects may not be apparent in the field.

Important note: There are differing views and updated medical approaches regarding how to position the person after rescue (lying flat or seated). For this reason, treatment should be carried out by trained personnel on site and emergency medical staff according to current first aid protocols. The safest approach is to bring the person down quickly and get them to professional medical help.

How Is Suspension Trauma Prevented?

The best treatment is for the trauma never to begin. The core components of a prevention approach:

• Correct harness selection and fit: A well-fitting harness balances the pressure of the leg straps.
• Suspension trauma relief straps: Some harnesses are equipped with straps that allow the leg muscles to be worked by standing on them when suspended. This delays blood pooling.
• System design that reduces the fall distance and the likelihood of suspension.
• Above all, a ready and rehearsed rescue plan.

EKS Work Safety’s harnesses, retractable fall arrests, tripods and rescue winches, and connection equipment are evaluated as a system to both arrest the fall and support the rescue process. Because real safety does not end with arresting the fall; it is completed by bringing the person safely down to the ground.

Frequently Asked Questions

How quickly can suspension trauma be fatal?
Symptoms can begin within a few minutes; in some cases loss of consciousness can occur in about seven minutes. The commonly cited upper limit is 30 minutes, but this is a warning, not a safe period.

If there is a fall arrest system, is a rescue plan needed?
Yes. The fall arrest system holds the person suspended in the air; the real danger begins at this point. Without a rescue plan, a fall arrest system alone is not enough.

Is medical assistance needed if there is no injury?
Yes. A suspended person must undergo medical evaluation even if there is no visible injury; delayed effects may not be noticed in the field.

How is suspension trauma prevented?
A well-fitting harness, suspension trauma relief straps, system design that reduces the fall distance, and a pre-rehearsed rescue plan are the most effective prevention methods.

Safety Is Completed Not by Arresting the Fall, but by Rescue

Suspension trauma is one of the least known but most critical risks of work at height. A fall arrest system can save a life; but to protect that life, the person must be brought down to the ground quickly and safely. This is why every work at height operation needs a ready rescue plan as much as fall arrest equipment.

With over 20 years of experience, EKS Work Safety provides not only equipment that arrests the fall but also tripods, rescue winches, and connection systems that support the rescue process, as a whole. To set up a safety system suited to your work area that also covers the rescue plan, you can contact EKS Work Safety.

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