drowning
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What is drowning?
Drowning is suffocation caused by being immersed in liquid, typically water. When water covers the mouth and nose, the body's oxygen supply is cut off. The person will stop struggling from the lack of oxygen, lose consciousness, and release any remaining air from the lungs. Although the heart may continue to beat briefly, it eventually stops.
Asphyxiation occurs in all drowning incidents; however, water may or may not enter the lungs. In "dry" drownings, the breath is held, or a reflex spasm in the throat seals off the airway.
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What causes drowning to happen?
Drowning is essentially suffocation caused by being immersed in liquid, typically water. When water covers the mouth and nose, it cuts off the body's oxygen supply. Without oxygen, the person loses consciousness and stops struggling.
Asphyxiation, or lack of oxygen leading to unconsciousness, is typical in all drowning incidents. Actual aspiration of water into the lungs may or may not occur.
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What are the main signs that someone is drowning?
Drowning occurs when water cuts off the body's oxygen supply, leading to suffocation. The victim stops struggling, loses consciousness, and exhales remaining air. The heart may beat briefly before ceasing. Up to 15% of drownings are "dry," where a reflex spasm seals the airway.
A natural biological mechanism triggered by contact with extremely cold water, known as the mammalian diving reflex, enhances survival during submersion. It diverts blood to the heart and brain, interrupts respiratory efforts, and reduces the heartbeat rate.
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How can drowning be prevented?
Drowning can be prevented through several measures. Lifesaving organizations and associations offer training in lifesaving and water-safety techniques. These organizations certify individuals in preventing drowning. When someone is drowning, extending a hand or using an object like an oar can help them reach safety without entering the water. Ring buoys, life vests, and inflated tubes can also provide buoyancy until help arrives.
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What steps should you take if you see someone drowning?
If you see someone drowning, remember that acting quickly and effectively is crucial. Here are the steps you should take:
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Reach: If the person is close to you, extend a hand or any object like an oar or paddle to pull them to safety without entering the water.
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Throw: If the person is out of reach, throw a floating object such as a ring buoy, life vest, or inflated tube.
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Swim: As a last resort, a strong swimmer can attempt a rescue by approaching the person from behind, grabbing them firmly, and towing them to safety.
Whether you are a skilled lifesaver or not, you can still provide effective assistance. Contact with a drowning person poses no threat to the trained lifesaver, however, who is skilled in ways of avoiding or releasing the grip of the victim.
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How can communities increase water safety to reduce the risk of drowning?
To increase water safety and reduce drowning risks, communities can implement several strategies. Offering swimming and water-safety courses, like those by the American Red Cross, can equip individuals with essential skills. Public education on drowning prevention, emphasizing the importance of life jackets and awareness of water conditions, is also crucial. Furthermore, training and certifying individuals in lifesaving techniques can ensure skilled responders are available in aquatic emergencies.
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drowning, suffocation by immersion in a liquid, usually water. Water closing over the victim’s mouth and nose cuts off the body’s supply of oxygen. Deprived of oxygen the victim stops struggling, loses consciousness, and gives up the remaining tidal air in his lungs. There the heart may continue to beat feebly for a brief interval, but eventually it ceases. Until recently, the oxygen deprivation that occurs with immersion in water was believed to lead to irreversible brain damage if it lasted beyond three to seven minutes. It is now known that victims immersed for an hour or longer may be totally salvageable, physically and intellectually, although they lack evidence of life, having no measurable vital signs—heartbeat, pulse, or breathing—at the time of rescue. A fuller appreciation of the body’s physiological defenses against drowning has prompted modification of traditional therapies and intensification of resuscitative efforts, so that many people who once would have been given up for dead are being saved.
Although asphyxiation (lack of oxygen that causes unconsciousness) is common to all immersion incidents, actual aspiration of water into the lungs may or may not occur. Up to 15 percent of drownings are “dry,” presumably because the breath is held or because a reflex spasm of the larynx seals off the airway inlet at the throat. When aspiration does occur, the volume of fluid entering the lungs rarely exceeds a glassful; the lungs “fill with water” chiefly because of an abnormal accumulation of body fluids (pulmonary edema) that is a secondary complication of oxygen deprivation. Commonly, also, quantities of water are swallowed and later vomited spontaneously or during resuscitative procedures; vomiting after the protective laryngeal spasm has subsided can lead to aspiration of stomach contents.
A natural biological mechanism that is triggered by contact with extremely cold water, known as the mammalian diving reflex, enhances survival during submersion, thus permitting seagoing mammals to hunt for long periods underwater. Scientists have recently determined that vestiges of the reflex persist in humans. The mechanism is powerful in children. It diverts blood from the limbs, abdomen, and surface areas of the body to the heart and the brain. It also causes an interruption of respiratory efforts and reduces the rate of the heartbeat. Even though the heart functions at a slower rate, in other respects it performs normally; actual arrest of circulatory processes is a relatively late development in the drowning sequence. In this suspended state, intracranial blood retains sufficient oxygen to meet the brain’s reduced metabolic needs, despite a total absence of respiratory gas exchange.
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In warm water the body’s need for oxygen is increased; therefore, the oxygen deprivation caused by immersion is rapidly lethal or permanently damaging to the brain. Such warm-water drownings occur commonly in domestic bathtubs.
Immersion in icy water causes body temperature and metabolism to fall rapidly (the thermal conductivity of water is 32 times greater than that of air). Immersion hypothermia—below normal body temperature—reduces cellular activity of tissues, slows the heart rate, and promotes unconsciousness. None of these effects is imminently life-threatening; survival following hypothermic coma is almost 75 percent.
Rescue teams now continue the benefits of cold-water protection with “therapeutic hypothermia.” “Lifeless” immersion victims with core temperatures as low as 62.6° F (17° C) have survived. See also lifesaving.