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I mean you are always going to run into study design limitations. In this case most of the money in medicine wants NPs to look good so there isn't good funding for this. The VA (generally) has pretty much the worst healthcare in the country and the quality of care in the ED is also pretty much the worst in the hospital (because of how it gets misused). This is likely to flatten the curve a little bit - good doctors almost never work at the VA.
Psychiatry is a better example - psychiatric interviews and pharmacology are the most complicated in medicine. Mental health care NPs are terrible at both of these things, give people unnecessary medications and incorrect diagnoses and are legible experienced as lower quality by patients and staff with some regularity. In general hospital medicine nurses line up each other and that includes NPs but in most mental health care settings nurses will say they think the NPs are shit.
However the bad outcomes are mostly increased lifetime mortality and risk of side effects 20 years down the line when the patient is seeing someone else. This becomes effectively impossible to study so we don't.
Now you could argue that you don't really care about those problems and if its not obvious their is a skill difference in outcomes lets save money, who cares if people have the wrong medication or diagnosis. But that goes back to the ED stuff - you have a difference in mortality and morbidity, it may be small but most Americans value "the best possible" not "good enough."
Also, since this is why people normally bring it up - if you magically paid all doctors NPs salaries and didn't really change anything else......healthcare costs wouldn't go down at all in any substantive way.
I should emphasize that I have a lot of respect for psychiatrists, who seem to hurl themselves into the breach of various social ills in a way I certainly wouldn't want to do. But if we're searching for a test field where rigorous evidence makes it very legible which are the "necessary medications" and "correct diagnoses," so that MDs' highly effective healing practice contrasts clearly with NPs' useless flailing, then I'm not sure psychiatry is the obvious pick. We're talking about the same psychiatry that regularly diagnoses from subjective surveys and patient self-reports, correct? Where almost none of the biological mechanisms are thoroughly understood, either for the ailments being treated or the medications that treat them? Where exercise, healthy diet and getting plenty of sun/fresh air seem to work as well as the best drugs a lot of the time? Where official medical conditions pop in and out of the DSM with every passing political wind?
Would you say that psychiatry does a good job of monitoring its physicians' contribution to patients' lifetime mortality and/or risk of third-order side effects 20 years out, either across different levels of physician talent/conscientiousness, or versus not receiving psychiatric care at all?
I don't quite get the reasoning here. Is the idea that receiving NP salaries would cause physicians to practice as badly as you believe NPs practice, because all the competent MDs would decamp for higher-paid professions (notwithstanding the additional benefits of prestige, flexibility, autonomy and meaning in medicine)? Doctors in Canada, the UK and Germany earn about 1/3 to 1/2 what they earn in the US; is the contention that they must practice incompetently and waste a ton of money doing so?
It's called the art and science of medicine for a reason, in psych it can be pretty evident to the lay man, in other specialties it's less but still present. This means experience, heuristics, gestalts, they lead doctors astray yes, but for a lot of things we don't have good guidelines or understanding.
Importantly, doctors can be sued - this causes all kinds of problems but it does serve as a feedback mechanism that assess for problems and gives patients recourse.
Let me give a specific example of how this happens, sticking with psych because it's more interesting than me mumbling about open vs lap vs conservative appendix management.
Most people are aware of Bipolar disorder, at least superficially. Lots of people say "I have mood swings" and tell that to healthcare workers with less training, these people dutifully write down Bipolar in the chart. Or they say "you ever like have mood swings and be unable to sleep?" Gets the diagnosis. Someone who actually has Bipolar 1 with a manic episode barely sleeps for a week of more, does illegal things, or spends ALL of their money in the bank account and all kinds of other stuff. The diagnosis is serious and life limiting without treatment. The medications are also serious - most patients get antipsychotics these days which increase all cause mortality. They are worth it if you actually have the disease. Put undertrained staff give the dx to people who don't have it and then suddenly...
NPs also do things like mix benzos and stimulants, put people with depression or anxiety on antipsychotics which will result in an early death....just all kinds of ridiculous stuff.
The skill ceiling in psych (and medicine) is very high, but if you don't work in healthcare you'll (hopefully) never see it come into play. Most medical work isn't your quick annual physical with your doctor but for many patients (especially young ones) that's all you see.
As for the second point, no the issue is that physician salaries are less than 10 percent of healthcare spending, and it's been decreasing every year. Cutting doctor salaries does not solve the problem and introduces all kinds of new problems.
Likewise NPs don't save money because they do more unnecessary testing and over consult, which drains the specialists and slows down care.
OK, this is a good example for illustrating the difficulty I'm having with the binary MD-competent/ NP-incompetent model. So here we have a fairly clear, potentially dangerous error in practice. Insofar as it is fairly clear, you were able to explain it to me in a paragraph or so: now I, a random Mottizen, understand that it's bad to diagnose and medicate bipolar just on the basis of "mood swings" or "poor sleep," and that patients should instead be experiencing very florid manic episodes with clear life consequences. That's facile, but for someone going on to psych practice, I'd imagine a few additional hours of video case studies would eliminate the lowest-hanging 80-90% of obvious mistakes of the form "don't diagnose bipolar in this clearly not-bipolar patient, dummy." So presumably that same advice and video training could be administered to a DNP before they begin psych practice, problem solved.
Fine, says the MD, but what about the top-10% "art of medicine" situations where the line is far more nuanced? There aren't empirical tests to verify a diagnosis; what if the situation sounds right on the border? The precise mechanisms of bipolar are poorly understood; what if there are a lot of other things going on and it's not clear how they interact? Or it's not clear how medication will impact any particular patient, so what if the risk-benefit math around prescription is very challenging?
I can easily see how what you call the "skill ceiling" could come into play there, leading an NP to get those questions wrong. What I don't see is the training value-add that makes you confident a random board-certified psychiatrist would clear the skill ceiling and get them right. There's not good basic science around these issues, so the organic chemistry and anatomy from med school certainly won't help. Residency? Presumably this means that the MD encountered some difficult cases under supervision and was admonished to approach each case the way their attending would do it. However, (a) that could have been an indefinite amount of time ago, and there's nothing beyond some trivial online quizzes to ensure the MD has kept up with new data since their training; and (b) even back in training, nobody was checking to make sure the supervisor was themselves particularly judging the situation "correctly". Indeed, how could anyone even define "correctly," if the case was by definition so difficult and subtle, the kind of situation where the wrong call would just make a patient sadder and less functional 20 years hence, not cause them to keel over and die on the spot? Doubtless the attending felt confident that their approach was making a real difference; but we all know the various cognitive biases that would lead doctors to overestimate the correctness of their judgment and the effectiveness of their treatment under those circumstances.
I guess it boils down to the broader question "when psychiatry works clearly, it should work for DNPs too; but when it doesn't work clearly, how can you be sure it works at all?" One established answer is to turn to empirical investigation to discipline our judgment; but as you point out, psychiatry isn't a field with a lot of options for carefully blinded RCTs and massive long-term studies.
I think people in other fields fail to understand how egregiously poor a lot of NPs are. Most settings they are still supervised or deliberately have low complexity cases sent their way or have some other aspect of the environment that protects them (for instance inpatient NPs just consult specialists for everything and those specialists manage the patient even though the NP is on charge on paper).
Surely they must have some training, and they can't be that bad, right? Like who would let them practice if they are that bad?
They are that bad.
It's been hard to extract the data about this because of financial interests in NPs, and the general difficulty of doing medical research.
So much of medicine is opaque to those outside the field and even inside of it (I know nurses who have been working for 40 years and go "huh" when you tell them the resident has been working 24 hours in a row).
Fundamentally I see midlevels every week who make decisions that would make me go "holy shit you are the worst doctor in your specialty I've ever met," it's near constant.
It sounds histrionic and unbelievable but that's how so much nonsense in healthcare is.
Amazon, google, apple, tons of finances firms have all come into medicine and gone "damn that shit is run so poorly surely we can do better" and then run away screaming.
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