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 +1  (nbme22#14)

Kid probably had cholera -- giving Na+ and glucose takes advantage of sodium-glucose cotransporter thereby replenishing electrolytes and energy.

hipster_do  To add on to the diarrhea kid -- SGLT1 is the Na-glucose symporter and it facilitates movement of water into the enterocytes. Water loves to follow sodium around, I think sodium over other electrolytes purely because sodium is generally the highest concentration electrolyte.

Subcomments ...

submitted by hipster_do(4),

I’m going to say it’s X linked agammaglobulinemia rather than SCID, but the difference between these two are tiny but this is why I think it’s the former:

  • Boy (increased risk but both BA and SCID are x linked)
  • Recurrent bacterial infections but don’t mention diarrhea or thrush which is in SCID
  • Timeline is after 6 months, so the mother’s antibodies wore off.

SCID should be immediately because they just don’t have the IL2 receptors. CVID shows up when they’re 20-40 years old. You get absent germinal centers in both. No mention of absent thymic shadow which is in SCID.

placebo079  “Uniformly” low is also a clue; in CVID they are not. +1  
tea-cats-biscuits  This makes sense, though what really threw me off was that in Classic Bruton’s Agammaglobulinemia there’s near-zero B counts though (or at least that’s what FA and UTD says, “Absent B cells in peripheral blood” FA 116, 2018). The Q says the leukocyte count was normal though. Wouldn’t the leukocyte count include lymphocytes in the differential? And wouldn’t lymphocytes be low due to the near complete lack of B cells in peripheral circulation if it was BA? +1  
partybrockk  @tea-cats-biscuits Bruton’s is a failure of B cells to /MATURE/. So you get normal lymphocyte counts, decreased levels of immunoglobulins, and absent germinal centers. +1  
tea-cats-biscuits  @partybrockk That makes sense to me, but I keep getting hung up on how that’s not what either FA or UTD says about the classic lab findings of XLA. UTD specifically says this: “Laboratory findings include hypogammaglobulinemia/agammaglobulinemia, deficient antibody responses to immunizations, and absent or markedly reduced B cells in the blood,” and I previously quoted FA. I suppose it doesn’t really matter, but it’s definitely a bit frustrating unless I’m missing something about how absent B cells in the blood wouldn’t correlate to a decreased lymphocyte count ... +1  
temmy  please correct me if i am wrong cos i might be but my logic was there is decreases immunoglobulin uniformly meaning the B cells are uniformly absent and since they develop in the germinal center, the germinal center will be absent. +  
almondbreeze  Picked 'decreased # of CD4 lymphocytes'.. ->Both CD4 and CD8 T lymphocytes were affected; the decrease was most pronounced for naïve T cells. (https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1809006/) +