I’m back! Where did September go? The dearth of posts has been the result of a period of ample time to write but lack of inspiration followed by a period of ample inspiration and lack of time, in the midst of the constant struggle to strike the right balance in my life.
Residency is a time of highs and lows. At times, one feels surprisingly confident and competent, almost proficient, but then foolish and amateurish in the next moment. Here is one of the lows.
I saw one of my clinic patients a few weeks ago who presented with a sore throat, cough, and runny nose for a little over a week. My impression from his history was that he had a cold, but I dutifully checked him over from head to toe, looking in his ears, nose, and throat, listening to his lungs and heart. After finding nothing of interest, I concluded that he did indeed have a common cold. I stepped out of the exam room to discuss the case with the attending (supervising) physician to whom I presented my findings and impression. As a routine measure, she accompanied me back in the room to verify some of the key elements of the history and exam. Feeling that this was more than a little unnecessary for such a benign problem, I stood by confidently as she also looked, listened, and felt. But as she listened to the lungs, she tilted her head to the side, and looked far off in the distance, obviously listening very intently over one particular area of the lung field. ”He has some wheezing and crackles in the right base, don’t you think?”
Were I practicing alone, missing these lung sounds would not have harmed this patient. Although the presence of this finding suggested a diagnosis of bronchitis rather than viral upper respiratory infection, and although we did give him antibiotics, there’s little evidence that antibiotics are necessary and people with bronchitis essentially always get better without them. Certainly, he would not have died without antibiotics. But listening to the lungs is, as you might imagine, one of the most basic skills that even a first year medical student possesses, so missing such an obvious finding was humbling to say the least.
I could swear his lungs were clear when I listened to them the first time, but just minutes later, I too could quite clearly hear the abnormal sounds. Did I just not listen hard enough the first time? Maybe I just missed putting my stethoscope over the area where they were most audible? Or, maybe the patient coughed just prior to my listening and cleared out the secretions? All of these are definite possibilities and unfortunately I don’t get to know the answer. But, I have to assume that they were there and that I somehow failed to hear them.
More troubling, I was not entirely sure what to learn from this. Listen harder next time? It’s not as though I had made a less than adequate effort or was rushed or careless with the exam. No, instead I believe I fell victim to the most human of errors, seeing only what we expect to see.
In science we call this confirmation bias. Confirmation bias is the tendency to search for and accept evidence that supports our pre-conceived beliefs and to ignore or reject evidence that opposes those beliefs. Humans are susceptible to this in all aspects of our lives from our political views and religious beliefs to our favorite foods and movies. Scientists take extraordinary means to avoid this bias by conducting experiments designed to disprove their own theories. The practice of medicine, although not a perfect experimental science, can be approached in a similar way. I thought this patient had a cold, and I performed my exam with the expectation of not finding anything. If I had approached this patient with the belief that he had pneumonia, might I have been more thorough and deliberate when listening to his lungs, searching for evidence to support that belief? I’m pretty certain the answer is yes.
Having a healthy dose of skepticism about the beliefs of others is one thing, but being skeptical of your own beliefs is far more challenging and unnatural. When taking care of patients, being your own devil’s advocate is exactly what is required. In this case, there would have been no serious consequences to my missed diagnosis, but that will not always be the case. Sometimes, rarely, it may be a difference of life or death.
Posted by Matt
Posted by Matt
Posted by Matt