Travis Smith, DO Profile picture
Jul 18, 2020 25 tweets 35 min read Read on X
Before we start, if you didn't check out @_HarryPaul_ twitter thread from last wk, 👉👉

Now the initial PR:

A 60 y/o M w/ PMH of relapsing MS dx (last flare 4 yrs ago) p/w unsteadiness, trouble focusing & weightloss was tx for MS flare w/o improvement
"difficulty focusing on objects" --> interesting

maybe he has diplopia, Check out this flow chart for this "blurry" topic

Is this JC virus reactivation with PML?natalizumab and some of the new oral agents can cause: iomcworld.org/open-access/na… Image
He was treated for an MS exacerbation, what does that entail? ncbi.nlm.nih.gov/pmc/articles/P…

MS can cause lesions in temporal lobe for example

Unusual ocular motor findings in multiple sclerosis
pubmed.ncbi.nlm.nih.gov/16466746/
Ocular findings in MS from prior article: such as bilateral third nerve palsy, opsoclonus, Horner's syndrome and one-and-a-half syndrome (horizontal movement disorders of the eyeballs, )
As for his unsteadiness, we would definitely tease out whether it is a visual, inner ear, cerebellum, or proprioception problem peripherally

Is this his MS or there could be something totally unrelated. An abscess, another primary tumor in the brain etc
Could his optic symptoms be Uhthoff phenomenon in MS? ncbi.nlm.nih.gov/books/NBK47024…

It is induced by an increase in body temperature resulting in“marked deterioration of visual acuity during physical exercise and exhausting”
Another cool phenomenon mentioned by @sargsyanz was Recrudescence of Deficits After Stroke

it occurs approx 4 yrs after the index stroke & is characterized by mild worsening of poststroke deficits that usually resolve within 1 day.
Recrudescence.....Infection, hypotension, hyponatremia, insomnia or stress, and benzodiazepine use are important precipitants; ncbi.nlm.nih.gov/pmc/articles/P…

Now back to which MS medication he is on as there are many side effects. He is on Rebif which is IFN-beta
Interferon B s/e flu-like symptoms, fatigue, depression, increased spasticity, transaminitis, rare autoimmune hepatitis, and injection-site reactions

IFN can kill lymphocytes, make your hair fall, cause flu-like symptoms and psychiatric problems
Fingolimod (Gilenya) s/e Transaminitis, lymphopenia, increased risk of serious herpes inf, HTN, bradycardia (usually only with the first dose), macular edema, basal cell carcinoma, PML

The risk of PML w/ fingolimod in the absence of prior natalizumab tx is 🔽low. 0.069/1,000 pts
It would be hard to attribute this just to MS flare alone given that he was just treated with steroids

What about his gait disorder? a tweetorial on gait disorders,
Physical exam shows supraclavicular lymph node otherwise known as virchows node and makes us worried for cancer including lung/GI cancer, ncbi.nlm.nih.gov/pmc/articles/P…

Is this a Paraneoplastic process leading to opsoclonus?
More on Virchows node: Remember that metastasis to the supraclavicular lymph node indicates advanced stage 4 disease.

Although Virchow's node is typically enlarged in gastric cancer, it can also be seen in lymphoma, breast, oesophageal, pelvic and testicular cancers
Is this a paraneoplastic process leading to opsoclonus?

We are worried about a process in cerebellum especially with relatively normal eye exam

Hmmm. PML generally affects posterior lobes (occipital/parietal) & occipital lobe involvement might explain some of weird vision sxms
His CEA was 1.54. guidelines do not recommend measuring tumor markers but we always do. A review of Tumor markers in clinical practice if you are interested. ncbi.nlm.nih.gov/pmc/articles/P…

Ct scan shows a mass between the duodenum and pancreas with liver mets.
Final Dx: Stage 4 pancreatic cancer w/ paraneoplastic syndrome (PNS)

ncbi.nlm.nih.gov/pmc/articles/P…
PNS is est to occur in 0.01-8 % of cancer pts, w/ 🔼incidence in those w/ small cell lung CA, GYN tumours or hematological dz. Paraneoplastic cerebellar degeneration (PCD) is the MC PNS Image
I need to start tagging @cjchiu so he can get some spaced repetition in as well. If you missed his recent episode on @MedTwitThisWeek here you go! We chat about #VMR https://t.co/Hnew3IrK6I

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More from @RosenelliEM

May 30, 2021
Some cool #Syphilis Pearls from an article that @k_vaishnani shared ncbi.nlm.nih.gov/pmc/articles/P… Primary syphilis first manifests into a painless chancre at the site of inoculation 1 to 6 weeks later…
Hematogenous dissemination then can occur typically 4 to 10 weeks later, giving rise to secondary syphilis. <40% of pts w/ syphilis have primary syphilis diagnosed. These “Secondary” lesions last for several weeks before spontaneously resolving. Coined “early, latent infection”
What does late infection mean? When syphilitic lesions recur after 1 year from the initial eruption, or seropositivity is detected more than 1 year after the initial eruption, it is termed late latent syphilis.
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May 29, 2021
Some optics neuritis pearls in a short #Medtweetorial 🧵…. We all know that optic neuritis is frequently associated with multiple sclerosis (MS). But optic nerve inflammation can exist from autoimmunity, infection, granulomatous disease, paraneoplastic disorders, & demyelination Image
Classical ON from MS is unilateral, moderate, painful color vision loss with an afferent pupillary defect & normal fundus examination.
In those with ON, 95% of patients showed unilateral vision loss & 92% had associated retroorbital pain that frequently worsened w/ eye movement.
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Oct 1, 2020
If you have not listened to the @CuriousClinPod most recent podcast (Episode 10: Why does metronidazole treat both bacterial and parasitic infections?) then I suggest you tune in.

curiousclinicians.com/2020/09/30/why…

I'll summarize their show notes here in short #medtweetorial
First a question:

Was metronidazole first used as an antibiotic or as an antiparasitic?
If you guessed antiparasitic, then you would be correct!

It was developed in the 1950s to treat the parasite trichomonas & then was used in the 1960s to treat other parasitic infections, like giardia and amoebiasis.
Read 14 tweets
Oct 1, 2020
When you order a serum alcohol level, what does the lab measure? An answer and a quick #Medtweetorial on false elevations in #ETOH
If you guessed NADH, you would be correct.
Most lab assays for serum alcohol utilize a reagent containing alcohol dehydrogenase & NAD+

This is used to convert all present ethanol to acetaldehyde

Thereby reducing present NAD+ to NADH.
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Sep 26, 2020
A Teal pain in the neck:

Follow along for a short #medtweetorial on #CervicalArteryDissection

or see the full handout here emboardbombs.com/s/Cervical-Art…

from @EMBoardBombs @blakebriggsMD @IltifatMD
This review will focus on spontaneous dissections, not traumatic, as well as the pathophys, risk factors, presentation, diagnosis, and management.

Cervical artery dissections are a common cause of stroke in young(<50 years )w/ some reports of up to 20% being from dissections
Much like aortic dissections, there is some loss of structure along the wall of either the internal carotid artery or vertebral artery

This allows blood to collect within the intima.

In patients <50 years old, cervical artery dissections account for 20% of ischemic strokes.
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Sep 26, 2020
Time for some #SpacedRepetition from @CPSolvers @DxRxEdu @rabihmgeha

Some chat recap #ClinicalPearls and bonus pearls from #VirtualMorningReport on Friday Sept 25th clinicalproblemsolving.com/morning-report…

Case by the brilliant @Rafameed Image
A 31-year-old M born and raised in Brazil w/ no PMH presented with a 3 mon history of worsening DOE, orthopnea, 7kg weight loss, abdominal distention, dry cough, and syncope

Base rate of disease for an ID case with @k_vaishnani and @Rafameed is very high
An interesting fact from @3owllearning : Depending on the clinical problems, the studies of disease probability for differential diagnosis often show 10 - 25% of cases are unexplained, even after careful examination and testing.
Read 17 tweets

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