Leo Reap Profile picture
Hematologist/Oncologist | Interests: HLH | Master Gardener | Personal Finance | Home Brewer | Cyclist | Forever learning | Opinions are my own
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Apr 27, 2020 38 tweets 14 min read
Proposed COVID-19 Pathophysiology [Part 3 of (now) 4]:

Coagulopathy Strikes Back.

What happens when #COVID19 clashes with the world of hematology?

Buckle up again for a long one.

...let’s dive in like this macrophage (exploring all directions): First, what do you think is the predominant mechanism by which thrombosis occurs in COVID-19?
Apr 16, 2020 24 tweets 11 min read
Proposed COVID-19 Pathophysiology [Part 2 of 3]:

Enter the magnificent macrophage.

What do #COVID-19 and hemophagocytic lymphohistiocytosis (#HLH) potentially have in common?

...let’s continue our journey onward into the cytokine storm. First, let’s briefly summarize what we covered before:

What mechanism may be partly responsible for heterogeneity of COVID-19 disease phenotype as well as its severity?
Apr 9, 2020 26 tweets 11 min read
Proposed COVID-19 Pathophysiology [Part 1 of 3]

What do #COVID-19 and #Dengue fever potentially have in common?

The answers have significant potential clinical implications in COVID-19.

Buckle up. It's a long one.

Let’s take a hematological walk on the zoonotic side. Dengue is a flavivirus that is called “breakbone fever”, a nod to bone-breaking pains that occur during the infection.

There are four serotypes of the dengue virus.

Infection with one serotype does not fully protect one from contracting a different serotype.
Apr 6, 2020 4 tweets 2 min read
[1/4] Anyone on #medtwitter or #covid4MDs started using steroids to treat #COVID19?

(At our institution we have moved away from the no-steroid dogma and anecdotally had good results in avoiding intubation with the use of high doses at the onset of worsening hypoxia or CRS) [2/4] Currently we've been using:

1. Methylprednisolone 125 mg daily
2. Decadron 10 mg IVP or PO BID
3. Prednisone 1 mg/kg PO in less severe cases

Which have you been using? If other, leave a comment below.
Apr 1, 2020 23 tweets 9 min read
Heme @tony_breu-style tweetorial (part 2):

Thrombocytopenia in #COVID19

While lymphopenia takes most of the hematology spotlight on the #COVID stage (80+%), accompanied #thrombocytopenia is also seen in ~36% of cases.

Why it occurs is equally as interesting. Why does thrombocytopenia occur in SARS Cov2?
Mar 31, 2020 26 tweets 8 min read
A hematology @tony_breu-style tweetorial:

Why does lymphopenia occur in #COVID19?

A normal WBC count and lymphopenia are seen in patients affected by COVID-19, but why it occurs has bothered me since the pandemic onset.

The potential answer is surprising and interesting. First, what do you think the mechanism is?