The helium-oxygen mixture has long been used as a gas in deep-sea shallow water and is often used in the treatment of acute obstructive dyspnea in bedding. In the mixture of helium and oxygen, the molecular weight of helium is small and the respiratory resistance is small, so there is no anesthetic effect. Helium is an inert gas that rarely reacts with other substances in the body. So we used to think that helium had no biological effects. But in recent years, experiments have found that breathing in a certain amount of helium helps protect the heart and brain. In response, scientists have restudied the biological effects of helium gas.

Although helium doesn't react with other substances, it's not as if helium itself has no biological effects. It is well known that high pressure can lead to nerve excitation, commonly known as high pressure neurological syndrome, which was discovered while studying helium-oxygen diving. Because helium has better thermal conductivity, it is easier to breathe helium to expel heat, and the loss of this heat inevitably leads to biological effects.

From this perspective, breathing helium does have biological effects. And a recent study showed that pre-inhaling a certain amount of helium gas can protect the heart and brain from ischemia. The study, of course, examines whether delayed breathing of helium still has a protective effect on the imagination. Unfortunately, the results show that the protective effect of helium is only immediately ischemic, leading to a significant reduction in the value of its clinical application. Because helium's protective effect is only available after a disease has occurred, it cannot be used as a preventive measure in advance. But the scientists say the experiment won't stop, and there is still room for improvement in the helium-oxygen mixture by studying when and how you breathe.

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