Direct injection ДЄir can be injected directly into a vein or artery accidentally during clinical procedures. Breath-holding while ascending from scuba diving may also force lung air into pulmonary arteries or veins in a similar manner, due to the pressure difference. This may happen after a patient is placed on a ventilator and air is forced into an injured vein or artery, causing sudden death. Trauma to the lung can also cause an air embolism. The symptoms may be subtle and not immediately noticeable, and may develop for some time after surfacing. Decompression sickness: Inert gas bubbles form in the bloodstream if the gas dissolved in the blood under pressure during the dive is not allowed sufficient time to be eliminated in solution on ascent.A pulmonary barotrauma is usually obvious and may present quite differently from decompression sickness. The diver will usually arrive at the surface in pain and distress and may froth or spit blood. This is easy to do as the lungs give little warning through pain until they do burst. Pulmonary barotrauma: Air bubbles can enter the bloodstream as a result of gross trauma to the lining of the lung following a rapid ascent while holding the breath the air held within the lung expands to the point where the tissues tear (pulmonary barotrauma).Gas embolism is a diving disorder experienced by underwater divers who breathe gases at ambient pressure, and can happen in two distinct ways: Besides, increasing use of pump injectors for contrast delivery, and percutaneous intervention to the lungs also increases the risk of air embolism. Interventional radiology procedures, cardiac, and neurosurgical procedures can predispose to air embolism. Symptoms of other consequences of lung overexpansion such as pneumothorax, subcutaneous or mediastinal emphysema may also be present.Д¬auses Interventional procedures.Symptoms of arterial gas embolism include: The first aid treatment is to administer oxygen at the highest practicable concentration, treat for shock and transport to a hospital where therapeutic recompression and hyperbaric oxygen therapy are the definitive treatment.ДЄir embolism in the descending thoracic aorta after CT guided percutaneous lung biopsy of a suspected lung tumour. If they are shunted to the systemic circulation through a patent foramen ovale they can travel to and lodge in the brain where they can cause stroke, the coronary capillaries where they can cause myocardial ischaemia or other tissues, where the consequences are usually less critical. Inert gas bubbles arising from decompression are generally formed in the venous side of the systemic circulation, where inert gas concentrations are highest, these bubbles are generally trapped in the capillaries of the lungs where they will usually be eliminated without causing symptoms. Breathing gas introduced into the venous system of the lungs due to pulmonary barotrauma will not be trapped in the alveolar capillaries, and will consequently be circulated to the rest of the body through the systemic arteries, with a high risk of embolism.

Air embolisms may also occur in the xylem of vascular plants, especially when suffering from water stress.Дivers can develop arterial gas embolisms as a consequence of lung over-expansion injuries. Air can be introduced into the circulation during surgical procedures, lung over-expansion injury, decompression, and a few other causes. Hypotension, headaches, vertigo, dizzinessДivers, substance abuse, improper needle usage, decompression sicknessДЄn air embolism, also known as a gas embolism, is a blood vessel blockage caused by one or more bubbles of air or other gas in the circulatory system. Drug injection can potentially be a cause for air embolisms.

Bubble trouble needle coral