Is measuring Blood Pressure important at 24,000 feet?
I have often thought that much of what we end up measuring in the operating room is because we stumbled at one point in medicine on learning how to keep track of certain variables. In the past, EKG was king - that is until SpO2 came along. If I have to choose today between the two, I will go for oxygen saturation. But in fact, if I could really chose, I would much rather know the value for SvO2 (mixed venous saturation) which is a really good indicator of how much oxygen is being used in our cells, and therefore a great indicator of a healthy perfusion and cell metabolism. (Today we estimate a good perfusion practically by just taking somebody's blood pressure (BP). But we don't have the luxury of measuring this easily and certainly not routinely, so I follow what we know how to measure as long as it's practical. The same goes for BP at altitude. Can we measure it? Sure. (See the picture below). Is it practical? Probably not, since placing and or wearing a blood pressur...