It takes less time to drown in fresh water than in seawater. Because in the case of fresh water drowning, a large amount of hypotonic fresh water in the alveoli enters the blood circulation, which leads to rapid blood dilution, increased blood volume and hemolysis, resulting in heart failure and pulmonary edema. However, people who drown in seawater, because there are salt substances in seawater, are hypertonic fluids, which can prevent water from being inhaled and suck out body fluids through alveoli, resulting in blood concentration and blood volume reduction. Therefore, basically 90% of drowning incidents occur in fresh water.

Usually people drown for about 2-3 minutes, and at most 10 minutes will lose consciousness and then die. ?

The time from drowning to drowning varies greatly, depending on the drowning environment, the drowning person's condition and the amount of water inhaled. If the drowning happens completely unexpectedly, the drowning person is in poor health or has cardiovascular disease after work, and can't swim and panic, death will happen quickly. When drowning, muscle spasm and trauma will also accelerate drowning. The temperature of water sometimes has an effect, for example, cold water causes muscle spasm and death is quick.

Principles of drowning treatment

1. Quickly remove the dirt in the mouth and nose to keep the respiratory tract unobstructed. Drowning is asphyxiated and hypoxic cardiac arrest, and oxygen supply is the primary goal, so A-B-C sequence first aid is adopted. First, perform 5 artificial breaths, then 30 chest compressions, then 2 artificial breaths, then 30 chest compressions, and then repeat the 2:30 cycle.

2. 3% hypertonic saline can be used for fresh water drowning, and 5% glucose or low molecular dextran can be used for seawater drowning.

3. Cardiopulmonary resuscitation.

4. Prevention and treatment of complications.