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Gas embolism specifically refers to a condition in which gas bubbles, typically from air or other gases, enter the vascular system. This can occur during certain medical procedures, especially those involving the manipulation of blood vessels or when there is an open wound allowing air to enter the bloodstream. When these gas bubbles travel through the circulatory system, they can obstruct blood flow, potentially leading to serious complications such as stroke, myocardial infarction, or respiratory distress. This understanding is crucial in anesthetic practice, as preventive measures must be taken to avoid scenarios that can lead to gas embolism, particularly during surgeries where the risk is elevated.

Other conditions mentioned are related but distinct. For example, air trapped in the lungs is not the same as gas bubbles in the circulatory system; it's a separate respiratory condition. Reactions to inhalation anesthetics are different from the presence of gas in the vascular system and typically involve biochemical responses rather than physical obstructions. Lastly, while low blood pressure is a concern in anesthetic practice, gas embolism is not directly classified as just a risk factor for it but can lead to various cardiovascular issues, including hypertension or hypotension, depending on the severity and location of the blockage.