July 26, 2016
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Drowning (cont.)

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Does the type of drowning matter?

There have been a variety of theories reported regarding the potential responses of the body to different drowning situations. Most discuss dry vs. wet drowning and salt vs. fresh water drowning.

Wet vs. dry drowning

Most drownings are unwitnessed, and the victim is found floating. While only a small amount of aspirated water is required to cause significant problems with lung function, it is the prolonged submersion time and lack of breathing that causes complications due to hypoxemia.

Approximately 10% to 20% of drowning victims have dry drowning with no water found in the lungs at autopsy, but even most wet drowning victims have less than 4cc/kg of water found in their lungs. For a 50 pound child, this amounts to less than 3 ounces of water.

Salt vs. fresh water drowning

In the lung, the breathing tubes (trachea, bronchi, bronchioles) branch into smaller and smaller segments until they end in an air pocket called an alveolus (plural alveoli). This is the part of the lung where air and red blood cells in capillary blood vessels come near enough to allow the transfer of oxygen and carbon dioxide between the two. Alveoli are covered with a chemical called surfactant that allows the air pocket to open and close easily when breathing occurs.

When fresh water enters an alveolus, it destroys the surfactant and causes the alveoli to collapse, unable to open with breathing. A mismatch can develop where blood is pumped to parts of lung where no oxygen is available to be absorbed. This may lead to a decrease in the concentration of oxygen in the blood called a ventilation-perfusion mismatch.

Salt water doesn't destroy surfactan; rather it washes it away and damages the membrane between the alveolus and the capillary blood vessel. One again, the body sends blood flow to areas of the lung that aren't able to provide it oxygen, and hypoxemia occurs.

Regardless of the type of water, lung function is compromised because of the lack of surfactant, and the effect it has on lung function. In some circumstances, electrolyte abnormalities may occur with fresh water drowning.

Medically Reviewed by a Doctor on 6/19/2015

Source: MedicineNet.com

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