“Anil Makam, MD, MAS, is a hospital medicine physician and nationally recognized health services researcher whose work sits at the intersection of hospital medicine, aging, and post-acute care. He is a passionate clinician educator and is well known for his work in evidence-based medicine (EBM), critical appraisal, and high value care. In this conversation, we cover a wide range of topics in EBM, diagnostic thinking, and A.I. in medicine.”
- Taken from Dr. Makam’s UCSF profile page (https://healthpolicy.ucsf.edu/profile/anil-makam)
Show Notes:
[0:00] Introduction & the Importance of clinical epidemiology
[3:00] A Brief Introductory Exploration of Bayesian Reasoning
Bayesian reasoning formalizes how doctors already think intuitively
The formalisation allows doctors to make their reasoning explicit (a key rational norm of our profession)
…promotes high value care, avoids diagnostic cascades, and it’s aesthetically satisfying
Vibes will always be a part of clinical reasoning and bayesian reasoning can make it more explicit so that—one hopes—we can reason with it better
Reference Class Problem
The reference class problem is a fundamental issue in probability and statistics (especially when trying to assign probabilities to single events or individuals). It arises when you need to estimate the probability of something happening to a specific case, but you only have data in the form of frequencies or relative frequencies from groups/classes of similar cases.The core question is: Which group (reference class) should you use as the basis for your probability estimate? Different choices of reference class can lead to dramatically different probabilities — sometimes wildly contradictory — even though all seem plausible at first glance.
[11:30] How Did Dr. Makam Revamp his Clinical Reasoning w/ his Epidemiology?
As clinicians grow in experience and mastery they can evolve from an anxious shotgun approach of diagnostic testing to a hypothesis driven sniper approach of diagnostic testing
General population data » re-calibrates relative diagnostic weight you place on H&P and lab tests
Likelihood ratios > sensitivity or specificity because it more closely mirrors how clinicians intuitively think
Sensitivity and Specificity Explained Clearly (Biostatistics)
YouTube · MedCram - Medical Lectures Explained CLEARLY
386.9K+ views · 11 years agoThe sensitivity and specificity are lying to you
http://first10em.com › the-sensitivity-and-specificity-are...
For lab findings that are continuous variables we should use continuous likelihood ratios because it quantitates the intuition that the severity of abnormality might merit differing levels of diagnostic weights
https://pubmed.ncbi.nlm.nih.gov/28370759/
PPV and NPV is contingent on the tested population which may not match your particular clinical context—hence we may use likelihood ratios instead (there are assumptions baked into this inference
Diagnostic literature makes it difficult to make sense of continuous likelihood ratios but if raw data is available, you can calculate it yourself
Dr. Makam has graciously provided resources as a primer to interval likelihood ratios and likelihood ratios in general as well as bayesian clinical reasoning for problem representations and illness scripts
His worksheets are here:
https://drive.google.com/drive/folders/10a-XAj2FCh1UTEuoKRiXtT2QJ913f0nM?usp=sharing
His resources are here:
Basic primer on simplifying LRs: https://pubmed.ncbi.nlm.nih.gov/12213147/
Advanced primers & examples on WHY and HOW to use interval LR for continuous tests:
https://pubmed.ncbi.nlm.nih.gov/34298090/
https://pubmed.ncbi.nlm.nih.gov/28370759/
Scaffold for Bayesian clinical reasoning is problem representation & illness scripts. Here are necessary scaffolds to apply this type of thinking:
Simple PR:
Simple illness scripts:
More detailed putting it all together: https://www.nejm.org/doi/full/10.1056/NEJMra054782
[26:30] Why Dr. Makam believes that certain doctors can outperform the specificity and sensitivity findings on physical exam manoeuvres commonly documented in the scientific literature
Dr. Makam provides a conceptual argument that clinical excellence is under-appreciated in discourse regarding the diagnostic weight of physical exam manoeuvres and POCUS interventions
To learn more about his paper “Striving For Diagnostic Excellence: The Median is Not the Message”
https://papers.ssrn.com/sol3/papers.cfm?abstract_id=5044377
[37:30] What medical education is NOT doing to prepare students for the rapid integration of artificial intelligence tools into healthcare
Students need to learn “human skills”
Leaning into Vibes based medicine (cultivating an informed prior probability, curating context (H&P), building a well calibrated clinical sense, moving beyond schemas and algorithms, and building experience in edge cases)
Embodied knowledge (learning to learn, loving learning, evaluative thinking skills, etc)
Communication
Building rapport
Communicating risk


















