12 January 21
How does drowning happen and how can you prevent it. The idea that a drowning person splashes and calls for help is mostly a myth. How do you spot someone in trouble? What are their chances of surviving once they do?
A view from the Sydney Morning Herald:
About 320,000 people die from drowning every year, including an average of 283 in Australia, according to the World Health Organisation.
In Australia, about 40 per cent of drownings occur in summer. By December 19, 15 people had fatally drowned (more than double the number at the same time last summer), according to Royal Life Saving Australia. Its chief executive Justin Scarr fears “this will be a summer like no other”.
It took more than four minutes for anyone to notice the five-year-old boy who appeared to have drowned in a small pool within touching distance of families and other children.
When drowning experts reviewed a video showing the boy floating face down for several minutes, they were shocked. It was nearly impossible to watch, even for people whose work is saving people from drowning. But the unconscious boy was resuscitated and survived. Unlike many non-fatal drownings, he suffered no lifelong injuries.
“After a year bunkered down at home, Australians will flock en masse to swim, boat, fish, picnic at beaches, rivers and lakes,” Scarr says. “Crowds will force people further from safety to places without lifeguards.”
How does drowning happen – and to whom? Why didn’t anyone hear that five-year-old’s cry for help? How do you spot someone in trouble? And how proficient should Australian children be in the water?
Why didn’t anyone hear the boy’s call for help?
Because he didn’t call for help. Contrary to the Hollywood stereotype, nobody in any of the 23 videos reviewed by international experts waved or called for help. (The videos had been sourced from closed circuit cameras and from people who had realised they had filmed a drowning only after the event.) That backs up what lifesavers see on beaches and in pools and rivers.
"There was a clear debunking of that theory," says Dr Shayne Baker, a lifesaver who has pulled hundreds of people out of the water in his 25 years of volunteering on some of Queensland's most dangerous beaches.
In November, a video went viral that captured the recovery of a 24-year-old Chinese student who fell in a river. She made no noise, and floated face down until she was rescued by 61-year-old Stephen Ellison, a British diplomat and consul-general.
In half the videos studied by experts, bystanders swam, walked or waded near the person in trouble. In the video of the boy, he is seen trying to reach the edge of the pool. He makes it momentarily, only to drop in exhaustion next to adults chatting in the shallows. Face down beneath the water, his limp and unconscious body is carried by the movement of the water across the pool. He comes to rest next to a woman who raises the alarm.
"It is bizarre," says Baker, who participated in the study. "When you are watching the videos, you think, how can you not see this child is not coping? They are not playing; they are fighting for their lives."
Other videos show people swimming laps over the top of people who have sunk after only a few strokes, and children whose flotation devices have capsized, trapping the child upside down beneath the water in both a pool and a large bath.
"The idea that you are going to get a clear sound, or indications, such as raising arms above the water, is wrong," says Baker, who is also Royal Life Saving Australia's education and training national adviser.
Not only is drowning a “silent killer”, but it can happen quickly, found drowning prevention expert Dr Amy Peden, a lecturer in injury prevention at the University of NSW.
In the case of the boy in the video, his mother had left the pool to have a sauna with a friend, presuming he would be safe surrounded by adults and children.
Peden studied the drowning deaths of 447 children under five in which coroners ruled distraction was a factor. A child can die in the time it takes to hang out a load of washing or stir food on the stove.
Housework inside the home – ironing and cooking – were contributing causes in about 125 deaths (about 28 per cent). Hanging out washing and other outdoor jobs and chores contributed to 13 per cent, and talking, socialising and playing with mobile phones about 21 per cent, found a paper by the University of NSW, James Cook University and Royal Life Saving Society Australia. (Peden says this provides an excellent reason to ignore the chores and play with your kids instead.)
How can you tell that someone is drowning?
Until the advent of mobile phone and surveillance cameras, there was only anecdotal evidence from survivors of non-fatal drownings about what happened and how they reacted. But the videos of people drowning found 19 were rescued before they became unconscious and five were unconscious.
Baker says the videos show that people who are trained to respond – lifesavers and lifeguards – are able to spot someone in trouble much faster than untrained bystanders. In more than half of the videos, bystanders failed to recognise any signs at all.
“You have a small window of time to respond and assist and retrieve them from the water.”
Baker says when weak swimmers begin to tire, they usually have trouble with any over-arm action. This is followed by changing to underwater arm action and then they are more upright in the water and are looking about for the closest point of safety or exit. He says they tend to lose any capacity to propel themselves forward. They often look like they are attempting to climb an underwater ladder or pushing their arms down behind them.
“With this person, you know you have a small window of time to respond and assist or retrieve them from the water.”
Most swimmers don't have the experience or skills to know to float and raise an arm. It sounds obvious, but watch for people whose faces drop below the water and don't surface fully to take a breath.
Someone who can’t swim will struggle to lift their head clear of the water to breathe and will have no control or capacity to control their body position/rotation.
“While there might be great deal of arm action, it is not guiding or directing them in any particular direction. They have already begun to drown and need an urgent response and intervention to minimise the drowning cycle,” says Baker.
What happens when a person is drowning?
Australia’s former surgeon general Professor John Pearn, a pediatrician, describes drowning as a hypoxic march of events that reduce oxygen to the brain until none flows at all.
When someone falls into water, they involuntarily hold their breath. That causes their pulse rate and blood pressure to rise until they reach "break point," says Pearn, who is also the national medical adviser to the Royal Life Saving Society Australia.
That’s when rising levels of carbon dioxide cause a receptor in the brain to fire off an irresistible compulsion to take a breath, says Pearn. Virtually all children, though, have a “brain-sparing diving reflex” that delays the intake of breath to provide them with an extra 30 seconds.
There comes a time, though, when everyone has to take a breath and you can't get your head above the water, says Pearn.
"It is a terrible moment," he says. "Against one's will, one has to inhale, and the water hits the larynx at the back of the throat."
Think of what it is like to have a drop of water go down the wrong way, he says. In a drowning situation, water rushes into the lungs, causing the person to become unconscious.
"At this stage, the heart is still beating, racing to overcome the lack of oxygen, up to about 200 beats a minute," he says. "Finally, the heart will slow down, because it hasn't got any oxygen. Usually they've been unconscious for three to five minutes in the water."
It takes an average of two minutes for someone drowning to become unconscious. That’s about the same time as it takes to brush your teeth (properly).
Would holding your breath delay this response? It may but even if you could, you shouldn't. Most people can hold their breath for only 30 to 60 seconds. Female Japanese divers can last two minutes — long enough to retrieve pearls.
Although schools once had competitions to see who could hold their breath longest, experts recommend against hyperventilating or breath holding before or during an endurance underwater swim. It can disable the “safety receptor” and cause some people to lose consciousness. Or, as Pearn describes it, “if the drive to breathe is lost, unconsciousness from cerebral hypoxia may occur before the hypoxia-induced breakpoint is reached.”
Who drowns and where?
Men. Four out of five people who fatally drown in Australia are male, with similar figures in most developed nations. The proportion of men who drown compared to women hasn't varied much since 1894, when the Royal Life Saving Society Australia began keeping records.
In the past decade, 2188 men have fatally drowned. Men represent 90 per cent of all fatal drownings among people aged 25 to 44.
Research by the Royal Life Saving Society Australia found 40 per cent of the men who fatally drowned in the past decade had drugs or alcohol in their systems. Of the men who had been drinking, two-thirds were above 0.05.
Men who fell by accident or jumped into water off rocks, bridges or river banks and subsequently fatally drowned were far more likely to have been drinking than others.
Why do men drown at a much higher rate? Peden says men are more likely to engage in high-risk behaviour, they’re more likely to spend a longer time in deeper water compared to females, more likely to drink and swim, and eschew lifejackets.
Other research has shown men overestimate their swimming abilities, and their assessment of their skill doesn’t match reality.
Young men are also most at risk of getting caught and drowning in a rip current, says Surf Life Saving Australia. In the past 12 years, rip currents have claimed 230 lives; half were males aged between 15 and 39.
Shayne Baker often asks people about to venture across Tallebudgera Creek, where it meets the ocean at Burleigh Heads in Queensland, whether they are strong swimmers. The tidal waterway looks inviting, yet rips and strong currents have been known to carry swimmers onto rocks and out to sea.
Many will say "yes".
Baker will then ask "so you swim an average of 12 kilometres to 16 kilometres a week, right?"
Uh, no. His definition of a strong swimmer is very different from that of most people who may swim for fun in pools and at the beach.
Falling into water is also a great risk for children. Over 2019-20, 12 children under the age of five fatally drowned, representing about 5 per cent of total drownings (and a fall of 52 per cent compared to the 10-year average). Of those deaths, most were toddlers about one year of age.
People (nearly all male) aged 25 to 34 represented the largest group of drowning deaths (17 per cent) followed by 35 to 44-year-olds at 14 per cent and 65- to 74-year-olds at 14 per cent.
Compared to the 45 fatalities that occurred on beaches over the previous year, nearly twice as many died on inland waterways including lakes, dams, rivers and creeks. Fishing on rocks without a lifejacket also causes around 26 deaths each year. In contrast, 28 people fatally drowned in pools.
Isn't all drowning fatal?
The definition of drowning is the “process of experiencing respiratory impairment from submersion and/or immersion in liquid”, according to the World Health Organisation. Some submersion results in death but many other people experience a non-fatal drowning that may result in lifelong injuries.
In addition to the 248 fatal drownings in 2020, there were an estimated 504 non-fatal drownings, many resulting in lifelong injuries.
For every Australian child under five who fatally drowns, about eight survive but many have brain injury, paralysis and other serious problems, found Australian research published in the medical journal BMJ Open.
Who survives drowning?
Survival depends on how long a person has been in the water and how long it takes before someone starts cardiac-pulmonary resuscitation (CPR). “If chest compressions happen within five minutes, you will do better,” says emergency retrieval doctor Brian Burns. “The longer that [blood] doesn’t flow to the brain, the worse you will do.”
Only 25 per cent of Australians have learned CPR, compared to countries such as Norway, where 85 per cent of adults know CPR. In Australia, most courses are run by the Australian Red Cross, St John Ambulance Australia and Royal Life Saving Australia.
Survival also depends on where you are and your proximity to emergency services. In remote and rural areas where young men may get into trouble in a dam or creek, it can take too long to get help. “By the time they get help to start resuscitation, it is usually too late,” Pearn said.
A study by Pearn reviewed 250 toddlers rescued from backyard pools with no pulse. To find why some children were resuscitated and survived and why others died, they attained estimates of how long a child could have been in the water.
Those children who fatally drowned had been immersed for "somewhere between five to 10 minutes".
"If we can rescue a person and get oxygen into the bloodstream again via the lungs, the brain and the heart are resilient and normal life can be resumed.
"If a young child, apparently dead, is fished out of a backyard pool, a fish pond or irrigation channel [close to ambulance, or near someone who can do CPR], for example, the chance of getting a save is 50 per cent [on average], which is very good."
“But if the person on the scene – usually one of hysteria, shouting and crying – who attempts resuscitation happens to have done a first aid course, the chance of that child surviving rises to 70 per cent.”
“It’s a wonderful thing,” he says of CPR.
- AUTHOR: JULIE POWER
- SOURCE: SYDNEY MORNING HERALD