00:00
Hello and welcome to this course on the physical exam. During this presentation, I'm hoping
to give a broad overview about why we're learning the physical exam at all. And I'm
welcoming you to this course with a case. So starting off, we have a 49-year-old man with a
medical history of obesity who presents with left-sided anterior knee pain that began
immediately after twisting his knee during a basketball game. And he says he is concerned
he might have torn his ACL and he would like you to get an MRI. Now this is a common
scenario. And it brings us to the question "Well, why not just get that MRI? What's the
purpose of learning how to do the physical exam and performing it on this patient?" I'm
hoping we can answer that question over the course of this presentation. So just quickly
shown here is a good example of something a physical exam would help to identify, but there's
no lab test to show this. These are half-and-half nails, also called Lindsay's nails which
suggest end-stage renal disease. So, a lot of people cite potential barriers to the physical
exam. You know, maybe it's a thing of the past, it's too antiquated, no longer relevant in
today's age of very advanced cutting edge radiologic imaging techniques. Maybe you just
let them learn how to do it or maybe your colleagues or your professors have not learned
how to do the physical exam effectively and they can't teach you. Is the exam even when
you know how to do it really accurate and in particular is it more accurate than imaging?
And do you have time to learn it and time to do it and staying with the patient rather than
just quickly ordering that MRI and moving on to the next patient?
In some ways, the decision about whether to learn the physical exam and apply it is a conflict
between the physical exam and physical diagnosis versus radiologic diagnosis. Which is more
accurate and are there any untoward consequences that can occur based on an overreliance
on one versus the other? Well, let's talk about the potential differences between physical
diagnosis and radiology. First off, let's say we were to get that MRI of that knee. Well, it turns
out that there's been a lot of studies looking at particular patients who have no symptoms
and then performing diagnostic imaging and seeing what you find in people with no symptoms
at all. And this is a good example. Amongst a hundred asymptomatic persons over the age of
45 just like our patient who undergo a knee MRI, 36 of them, 36% actually have meniscal tears
and had no manifestations of that meniscal tear. There are examples of this with every joint
in the body. And it brings us to this question about accuracy versus precision. Think of this
bull's eye figure here with right in the center is the actual source of the pain. Well, the
hope here is that the physical exam helps us to hone in on the source of the pain at the center
of the bull's eye. The problem with radiologic imaging is that oftentimes it has high precision
but low accuracy. Meaning you'll find things but those things may actually have nothing to do
with the source of the person's pain. And this comes up time and time again when we have an
overreliance on radiologic imaging finding all kinds of things we weren't looking for and don't
actually tie back to the physiology of the patient's pain. Likewise, those things that we find
can actually be particularly problematic for patients. We find lots of thyroid incidentalomas
when we rely upon ultrasound to look for nodules. We find adrenal incidentalomas in 4% of CT
scans, pancreatic incidentalomas with 15% of MRI scans, and pituitary incidentalomas when
we're looking at the head. And every time we find those incidentalomas, they can add anxiety
to patients and potentially leave them to getting procedures that would not have been
warranted. Likewise, radiation. One CT scan exposes patients to upwards of 10 millisieverts
of radiation. That's the unit of measurement that we use to gauge how much radiation a
person is exposed to. Cancer mortality we know historically that when people get upwards of
50-100 millisieverts of radiation in a year, they have an increased risk of malignancy of a
variety of different types. It's been estimated that over 2% of all future cancers in the
United States, which is approximately 29,000 cases per year, actually come from radiation
exposure alone which is pretty concerning when you think about all the imaging that we rely
upon in our country and in the world. And so many clinical signs to quote Abraham Verghese,
one of my own heroes in the realm of physical diagnosis, saw many clinical signs such as
rebound tenderness, lid lag, tremor, clubbing, or hemiparesis cannot be discerned by any
imaging test. And here's another example of which is xanthelasma around the eyelids. You
can see lipomatous lesions around the medial canthal folds in this lesion. So having talked
about some of the disadvantages of an overreliance on radiologic imaging, let's talk about
some of the advantages of using the physical exam. Well first off, it's unlikely you're going to
identify lots of incidentalomas on your physical exam and unless you're drinking a pint of
radioactive iodine before you examine patients, it's probably the case that you're not
going to be exposed in the radiation and the process. Moreover, the physical exam is
something that's exciting for us and enjoyable and rewarding. It may be one of the reasons
that you went into medicine in the first place. You know we didn't come here to become data
analyst or computer programmers. Being at the bedside with patients is a rewarding
endeavor and it's worth continuing to flash out your own skill set. The physical exam is also
free, you don't need to order an MRI and spend money and tax in the healthcare system.
05:56
Your skills are with you at all times, they're always available 24/7. And here's one of the
most important points. A lot of the things that you're going to learn during your medical
training will, I'm afraid, become obsolete within the next 5, 10, or 15 years particularly
diagnostic testing approaches, laboratory testing, and a lot of pharmacotherapies. But the
skills you learn now in this course on how to actually examine patients and identify subtle
manifestations of systemic disease will stay with you for the rest of your career. So learning
things today has a timelessness in terms of your proficiency. And lastly, and I harken back
to the idea of ritual that Abraham Verghese has talked about, "Being at the bedside of
patients allows us to connect with them." They don't want us connecting with their charts
in a room elsewhere in the hospital. They want us at the bedside listening to them, looking
in their eyes which brings me to this classic portrait from the late 1800's called The Doctor.
07:01
Now in this portrait what we can see is a doctor sitting at the bedside, gazing at his very sick
patient lying in this bed with the mother and father hovering in the back around and you can
see their grief-stricken postures. Imagine how different this portrait would be if instead of
the doctor sitting there, gazing at his patient, sharing in the grief of the parents, he instead
was looking at a laptop. It's a completely different experience if all we're doing is focusing on
the medical record and not the medical patient. And as sir William Osler himself once said "The
good physician treats the disease, but the great physician treats the patient who has the
disease." So how do we do that, putting the patient first? First, you want to make sure you
ask permission of your patients, they should not be viewed as objects. If you're going to
examine them, they need to invite you in. Second, respecting modesty is so important. Only
expose the part of the body, as little of the body, as is necessary to perform your exam. Also
ensure patient comfort throughout then make sure they're not cold or uncomfortable while
you're doing different parts of the exam. And also introduce everyone in the room. Your
patient has the right to know who else is in the room when you're exposing parts of their
body that normally are not exposed. And lastly, when you finish your exam, don't leave your
findings shrouded in mystery. Let your patient know what you found and how you interpret
it and what you're going to do about it.