Suspension Trauma - Four Corners Safety Network

Transcript Suspension Trauma - Four Corners Safety Network

SUSPENSION TRAUMA

Introduction

• ‘Suspension Trauma’ – The medical effects of immobilisation in a vertical position – Medical term is ‘Orthostatic Incompetence’ • The effects are nothing new – Crucifixion is death from suspension trauma • It presents an immediate threat of death to anyone immobilised in a vertical position – Hanging still in an industrial, theatrical or sport harness – Stretcher patients, performers, stuntmen, confined space workers • • The onset and progress are rapid and unpredictable All those ‘working at height’ must be trained in how to recognise, manage and prevent suspension trauma ©2005 www.suspensiontrauma.info

Immobile is important!

• Suspension trauma can only affect someone who is immobile – specifically not using their leg muscles to any great extent • It does not normally affect people who wear a harness but who are: – Actively moving about (climbing, caving, etc) – Suspended for only a minute or two (parachutists) • The danger is when someone is unable to move, or forgets to bother!

Who may be at risk?

• The ‘classic group’ are people who wear harnesses – Sport climbers, cavers, parachutists, parascenders, etc – Industrial climbers – Confined space workers lowered using a harness and winch – Theatrical and circus performers, stuntmen and artists • There are other ways to be ‘immobilised’ – Rescue stretchers, spine boards and splints – Personal pursuits involving bondage or confinement – Becoming stuck in a confined space ©2005 www.suspensiontrauma.info

So what happens?

• General feelings of unease – Dizzy, sweaty and other signs of shock – Increased pulse and breathing rates • Then a sudden drop in pulse & BP • Instant loss of consciousness • If not rescued,

death is certain

– From suffocation due to a closed airway, or from lack of blood flow and oxygen to the brain.

A little biology…

• Humans are not designed to stand upright – Our circulatory system was built for life on all fours – Volume of blood vessels is much greater than that of the blood • So, when we stand upright we have a problem – Gravity pulls your blood into your legs – Your heart is a positive-pressure pump – it cannot suck!

– The only way to get the blood back out of the legs is to pump it using another method.

Luckily, we’ve evolved one!

Muscular pumps

• The veins in your legs are entwined within the skeletal muscles, and when you move your legs, these muscles squeeze the veins, pushing the blood out of the way • We have one-way valves in these veins, so each squeeze can pump the blood a short distance towards the heart • Providing you are walking around, this process makes a ‘heart in each leg’ – and it’s very effective!

– Try it – take your socks off and stand still – look at your feet and you’ll see the veins all standing out and the skin red.

– Now walk around in a little circle and look again – the veins are empty and flat, and the skin goes pale. Pumping in action!

But what if we’re not pumping?

• If the muscles are not pumping the blood upwards, it pools in your legs – You can ‘lose’ several pints and go into shock • Your brain tries ‘shock’ for a while, but of course it doesn’t help – blood is still stuck in your legs.

• After a few minutes, it goes for the last-ditch method

If I faint, I fall over. I get the blood back.

How long have you got?

• Uninjured volunteers felt dizzy in as little as 3 minutes – Typically 5 to 20 minutes • Loss of consciousness in as little as 5 minutes – Typically 5 to 30 minutes It is difficult to put a timeline on deaths, however from research it is clear that death can result in as little as 10 minutes, more typically between 15 and 40 minutes post-suspension. Death is more rapid with existing injuries but can happen to anyone.

Feeling faint?

John Smith on parade John Smith in suspension

• Blood pools in the legs • Brain detects low O 2 • Cardiac output increases • Brain O 2 still falls • Emergency response: – Pulse drops – Loss of consciousness – John falls over – Blood flows back to brain • John wakes up.

• Blood pools in the legs • Brain detects low O 2 • Cardiac output increases • Brain O 2 still falls • Emergency response: – Pulse drops – Loss of consciousness – John CANNOT fall over – Brain cells start to die • John never wakes up.

What actually matters?

• Constrictive leg loops contribute but are NOT needed – Even stretcher patients are at risk.

• All makes of harness show almost identical results • Patient age, weight, height, sex and fitness seem to make little difference to the time it takes before you faint • Stress, panic, injury, smoking/drinking, extant cardiac conditions and illness increase the risks All that matters is that the legs are lower than the heart and the leg muscles are immobile. No other injury is needed.

OK, so we rescue them!

• No so fast! There’s something important to deal with: • The blood that is trapped in the legs may not be in very good condition, and may even kill the person if we let it all pour back into their brain!

• This is called the ‘reflow syndrome’ and is medically very complicated – you will not be able to control it once it starts, and the patient will die. Luckily you can prevent it from happening if you handle them with care!

Reflow Syndrome

• Pooled blood in the legs is ‘stale’ after 10-20 mins – Drained of oxygen, saturated with CO 2 – Loaded with toxic wastes (from the fat burning process) • Re-elevating the legs returns this to the rest of the body in a massive flood – Heart can be stopped – Internal organs (especially the kidneys) can be damaged • You have to stop this flood of stale blood – but still keep enough tricking to the brain to keep the person alive!

Preventing suspension trauma

• If you’re in a a harness by CHOICE: – Keep your legs moving as much as you possibly can – If you’re not using your legs much, you need a workseat – Take regular rest breaks, eat and drink normally • If you fall accidentally and are suspended: – AVOID using your legs. You don’t want blood sent there.

– Lift your knees into a sitting position – Relax as much as possible. Panic makes things worse – If you can, every few minutes swing yourself upside down • If you’re trapped and cannot move – Strain your leg muscles as hard as you can every 5 seconds – Breathe slowly and deeply – You’re going to be needing rescue!

Lifting those knees

• All you need is to get your knees level or higher than your hips – the position you’d be in if you were sitting on a chair • You can either sit ON something (a ledge, a plank of wood, etc) or put something under your knees (rope, strap, hose, wire.. Anything!) • Behind your knees there’s no fat, so padding is very helpful if you’re going to be there a while!

• Carrying something as simple as an 8ft length of webbing or thin rope is all you need – but being able to DO this depends on how your harness was attached!

Rear attachment points

• Using a knee-loop is possible but only with a separate anchor point • The head drops forwards and so the airway is at risk • Many people can’t even reach their attachment points after a fall ©2005 www.suspensiontrauma.info

Front attachment points

• For sport climbing or caving harnesses, or fall arrest with a front attachment point, access and knee-lifting is easy!

Emergency action

• • • • • If at all possible, climb out of suspension – Using self-rescue equipment, improvised or otherwise Get into a sitting position straight after the fall – Use a loop under the knees (rope, wire, clothing, etc) – Pass the casualty a workseat or improvised platform All casualties must be ‘immediately rescued’ – Abseil rescue kits, winches, hydraulic platforms, cranes, ladders – Suspension trauma is more important than other injuries – remember

life over limb

. Don’t be afraid of hurting someone to rescue them!

On-site first responders and communications are vital Never work alone! Who’s going to help you?

Hitting the ground

• Lowering systems must be controlled to prevent the patient’s body being laid flat as it reaches the ground – Keep them sitting up for 30 minutes • Normal first-response and paramedic rules are WRONG – This is not ‘fainting’ !

The Law - UK

In the UK, working at height is controlled by The Work at Height Regulations 2005 If operatives are using fall arrest equipment i.e. harnesses and lanyards/fall arrest blocks – Workers must have on-site rescue equipment and training – They must be rescued ‘immediately’ from suspension – Workers must be aware of the risks of suspension trauma – Any First Aiders must know how to treat suspention trauma safely – Any work in suspension must be minimised whenever possible • Work seats, rest periods, etc. must be used when needed ©2005 www.suspensiontrauma.info

And finally…

• Remember although suspension trauma is rare, it can happen to anyone.

• If you’re at work, the employer needs to manage the risks – if not, think twice about working!

• If you’re doing a leisure activity, think about what would happen if you fell, or got stuck. Would anyone help?

• It’s true what you’ve known all along – sitting down all the time is the best way to survive the day!