Much of science is not even science: it's consensus. It's basically the world's leading experts voting on what they think is fact, rather than waiting for the evidence to reveal the truth. It's creating theories and voting on which ones should be in the forefront of our minds. So when deciding on what to believe, we must never forget that "science is about evidence, not consensus."
It is so hard in the medical profession to separate consensus from science. In fact, one of the things that fascinated me most about the medical profession is it's loose relationship with science. In fact, early on in my studies I learned that medicine is loosely based on science, and more so based on consensus, which is not science at all.
Look at the hypoxic drive theory. It was based on a study of four COPD patients, and became a gold standard based on a presentation by EJM Campbell to pulmonologists in 1960 about the results of a study based on only four COPD patients. So basically the hypoxic drive theory, or hoax as I like to call it, was based on a consensus of experts, and had nothing to do with science.
So basically physician's under oxygenated their patients for over 70 years, and many still do, based on a consensus.
Look at all the breathing treatments we give based on a consensus that albuterol cures every lung ailment you can think of. Our new healthcare law insists that a lung patient must be sick enough to need 3 breathing treatments for reimbursement criteria to be met. This includes COPD, CHF, Asthma, Pneumonia, etc. So 3 breathing treatments are ordered on all these patients, and it's assumed they are needed. What's wrong with this picture? It certainly has nothing to do with science.
Other examples of consensus over science include:
- BiPAP pushes fluid out of lungs
- The earth is flat
- Man made global warming
- The continents cannot drift
- Stress causes ulcers
- Asthma is one of the seven pychosomatic disorders
- Phlogiston was necessary for combustion to take place
All of these theories are, or were, so widespread, and so well accepted, that they caused people to focus on treatments and therapies that probably did more harm than good (like under oxygenating COPD patients). As in the case with asthma, consensus caused experts to focus so much on a dead end path that it prevented the advancement of knowledge to the detriment of those who suffered from it (i.e., experts focused on treating asthma with psychosomatic medicines when they should have been looking treatments for inflammation and bronchospasm).
So when you're thinking about whether or not you want to believe something is true, consider the evidence and not the consensus. The fact that a majority of people believe something to be true does not make it so. In other words, it's okay to oppose the majority opinion, so long as the evidence is on your side.
When a doctor orders something, it's your job as a therapist, or a nurse, to do as you are instructed. For instance, if a doctor orders you to give a breathing treatment, then you must give it regardless that you know it is a waste of time. As the old saying goes, "It can't hurt."
Still, it really does hurt, because you're putting medicine into someone that doesn't need to be there, and, even though we can't always see them, all medicines come with side effects. And then there's also the side effect of second hand ventolin on those who are doling it out all day long.
However, when a doctor orders for you to maintain an SpO2 in the low 80s because of the hypoxic drive myth, it's time to rise up and challenge the consensus for the benefit of the patient, because, Lord knows, oxygen is beneficial to the living heart. Thankfully the hypoxic drive consensus/hoax is slowly fading, and COPD patients are actually being oxygenated these days.