Effect of low barometric pressure

With the influence of low barometric pressure person found while working in the highlands, flights on airplanes and other aircraft, and spacecraft. The adverse impact of low pressure gas environment is to reduce the partial pressure of oxygen (hypoxia), decompression disorders and "boiling" liquid body.
The lack of oxygen in the case of high-altitude mountain sickness in the body is a violation of the functions of the respiratory and circulatory, nervous, muscular, excretory and digestive systems. The fast development of high-altitude illness depends on the speed of lifting and body condition. In the occurrence of altitude sickness, in addition to lack of oxygen, play the role of such factors, as physical fatigue, cooling, ionized air, ultraviolet radiation. The decrease in oxygen content in the blood leads to reflex increased respiration, increased cardiac activity, increase in the number of circulating blood, released from spleen and other blood depots. If the cause of the hypoxia, valid for a long time, then there is adaptive increase in hemoglobin and the number of erythrocytes.
Following the reduction of barometric pressure, such as climbing to the height of 5000-7000 m above sea level, there are signs uncompensated oxygen starvation, develop severe pathological phenomena cardiac activity; on the big mountain heights sometimes pulmonary edema.
In severe hypoxia occurs euphoria, hallucinations, convulsions, sorrow, and sometimes complete loss of consciousness. Simultaneously detect disorders of breathing and blood circulation: shallow breathing, congestion of blood in the vessels, lowering blood pressure, cyanosis and swelling of the extremities. Disorders of the functions of the respiratory and circulatory more worsen the condition of the Central nervous system, which leads to a quick death.
In the study of the corpses of people who have died from acute hypoxia, find common signs of asphyxia or quickly actual death. Usually there are cyanotic skin, rich cadaveric spots, bleeding in the skin of the eyelids and conjunctiva, liquid dark blood, a plethora of internal organs, overrun by the blood of the right half of the heart and sinuses of the meninges, anemia spleen, bleeding under the visceral pleura, the epicardium, etc.
In addition to oxygen starvation, marked decompression disorders, the first signs of which appear starting from a height of 6000-8000 m Decompression disorders associated primarily with mechanical influence of changing barometric pressure on vozduhotehnika cavity - middle ear and paranasal sinus bones of the skull, intestines, lungs.
With the rapid decrease in atmospheric pressure, the pain in paranasal cavity of the nose and ear infections, bleeding in these cavities, breaks ear drum and others the Expansion of gases in the intestines and intra-lungs of the air leads to the rupture of the intestine, and lung.
When exhaustion of air, exceeding 6 kPa (height more than 18-19 km), tissue fluid of the body "boil", resulting in the accumulation of water vapor in the subcutaneous tissue, the detachment pliable skin from the underlying tissues. In the formed cavity rush dissolved in tissue fluids , gases, mainly carbon dioxide and nitrogen, creating a distinct picture of subcutaneous emphysema.
In the instant cases falling barometric pressure (explosive decompression) decompression phenomena are most acute, and clearly, there are gaps ear drum, bleeding in the middle ear cavity, etc.
In the study of the corpses of people killed as a result of significant reduction of barometric pressure, in addition to the signs of hypoxia are identified decompression damage similar to those that arise when the pressure drops from high to normal: gas embolism, a blood convolution containing bubbles of air, subcutaneous emphysema, hemorrhage.
In the study of the corpses found in the mountains, you should be aware of the occurrence of sudden death in patients suffering from cardiovascular diseases, as well as the possibility of electric shock from lightning, fall from height, appearance sun or heat stroke.
The combined effect of high and low barometric pressure can occur when the explosions large forces (tanks, gas tankers and other). In these cases, the area of a significant increase pressure alternates with an area of sharp negative pressure, which leads to a variety of injuries, mostly mechanical nature.