动脉血气分析是危重症患者必不可少的检查手段，可用来判断机体是否存在酸碱平衡失调、判断通气换气功能、缺氧及缺氧程度等等。此外还需要结合其他检查，结合临床动态观察，才能正确判断患者的体内环境。掌握各项指标的含义，这样有助于对异常指标的 ...

Testosterone levels peak during male puberty and decline with age in both males and females. With low testosterone in males, you can have a decreased sex drive, trouble with erections, and low sperm ...

The Colorado River, which feeds Lake Mead, is under unprecedented strain from drought, over-allocation, and climate change. The lake, which is America’s largest reservoir, supplies water to 25 million ...