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Drowning occurs when the patient's airway is filled with water, preventing air from passing into the lungs. Drowning may not end in death if the water is removed and respiration is restored in a timely manner. A submersion incident can result in nothing more than a cough; more serious injuries can present with vomiting, difficulty breathing, respiratory arrest, and cardiac arrest.
If a patient is still in the water on arrival, remember that your first priority is your personal safety and the safety of your crew. Look for dangerous situations that may have lead to the patient drowning in the first place. Assessing the quality of the water and the container it is in will clue you in to most potential hazards.
The recommended water rescue model:
Reach- if the victim is close enough to shore. You can use an oar, pole, branch, or another rescue device if you can't reach them with your hand.
Throw- a flotation device attached to a rope so the victim can be pulled to shore.
Row- if the previous methods are unsuccessful or the pt is unconscious, trained rescuers should row out to the pt if a boat is available.
Go- if a boat is unavailable and the reach and throw methods don't work, trained rescuers should go to the pt by wading or swimming.
The management of downing is focused around assessing for any co-dominant injury, controlling the ABC's, and preventing further complications.
If the patient is still in the water and you suspect a spinal injury, manually stabilize the neck and spine. If the patient is adequately breathing on their own, place them in the recovery position and administer oxygen. If a backboard is required, roll the victim partially on their side, so that aspiration can be avoided if the patient vomits; use suctioning as necessary to clear any visible fluids from the airway.
If an AED is available, it is safe to discharge the unit if indicated as long as the patient is not in standing water.
New AHA guidelines advise starting chest compressions 30:2 at a rate of at least 100 compressions/min regardless of respiratory status in this case. According to the AHA,
"As soon as the unresponsive victim is removed from the water, the rescuer should open the airway, check for breathing, and if there is no breathing, give 2 rescue breaths that make the chest rise (if this was not done previously in the water). After delivery of 2 effective breaths, if a pulse is not definitely felt, the healthcare provider should begin chest compressions and provide cycles of compressions and ventilation according to the BLS guidelines."
Special aquatic considerations
Beyond drowning, exposure to aquatic environments can result in health conditions that are not seen elsewhere; the most tested of these are decompression sickness, nitrogen narcosis, and "squeeze" injuries.
Decompression sickness "The Bends" occurs when a SCUBA diver descends to a significant depth and is forced to surface without appropriate "decompression stops" to allow for nitrogen that dissolves in the blood under high pressure to naturally and slowly percolate out fo the blood. This results in gas bubbles forming in the circulation and joints causing an incredibly painful and potentially life-threatening respiratory distress.
Nitrogen narcosis results in some individuals when SCUBA diving with a mix of gas in their air tanks that has a high percentage of nitrogen. The symptoms of nitrogen narcosis are largely identical to alcohol intoxication. The management of this condition is limited to the application of oxygen and ruling out the presence of decompression sickness.
Squeeze injuries occur when pressure is placed on the face by a diving mask due to failure to exhale through the nose while diving, causing significant pressure to be placed on the eyes, sinuses, and facial bones. This can result in nosebleed, eye injury, or sinus damage.