For hidrocución syncope (or water blow or court of digestion) understands the sudden loss of knowledge as a result of the sudden impact with the cold water. It is the classic syncope for plunge, not too frequently although fearsome because it usually provokes the cardiac unemployment and therefore it imposes the achievement of the cardiac massage for the revival. It is considered that the syncope for hidrocución is an extreme declaration of the reflex for immersion, this phenomenon that brakes the beats of the heart whenever the head interferes under the water.

Not to suffer this dangerous type of syncope it is necessary to avoid to enter the water of sudden form, after an exhibition prolonged to the sun, with current digestion or after an intense physical activity. On the contrary, it will be suitable the body to be wetted progressively before submerging. The individuals of advanced age and with tendency to a low cardiac frequency (vagotónicos) there are the categories with major risk of suffering syncopes for hidrocución.