Amy Yau Profile picture
Sep 13, 2021 19 tweets 10 min read Read on X
⁉️What is the difference between mineral and organic acidosis?
⁉️Why does one cause more hyperkalemia than the other?

Join me on this 🐇🕳️rabbit hole #tweetorial on metabolic acidosis and it's effect on potassium.

📊To start, which type of acidosis causes more hyperkalemia?
Metabolic acidosis is defined as a ⬇️low pH due to a ⬇️decrease in bicarbonate extracellularly

💎Mineral acids (aka inorganic acids) are “synthesized from earth minerals.”

🥬Organic acids are metabolized by the cell and occur naturally.
Both can have a 🩸high anion-gap...just depends on anion accumulated.

💎Mineral acids are often (not always) a hyperchloremic normal anion gap metabolic acidosis

Think of 🥬organic acidosis as high anion gap metabolic acidosis (though not always true)
📊What is the classic relationship between acidosis and potassium?
Hyperkalemia and acidosis go hand in hand, but type of acidosis does affect it

💎Mineral acidosis tends to cause ⬆️more hyperkalemia compared to 🥬organic acidosis due to 🌟cell shift.🌟

pubmed.ncbi.nlm.nih.gov/29495/
pubmed.ncbi.nlm.nih.gov/3884666/
There are a few ways acidosis can affect transcellular shift of potassium

📌low intracellular Na, low intracellular pH resulting in ⬇️reduced Na/K ATPase activity
📌Low extracellular bicarb leading to K efflux through Cl/HCO3 exchanger

pubmed.ncbi.nlm.nih.gov/21980112/
Skeletal muscle cells also have Cation/Cl exchanger and H/OrganicAnion (H/A) cotransport leading to 🌟differential effects on potassium🌟

pubmed.ncbi.nlm.nih.gov/27756725/
In 🥬organic acidosis → ⬆️ more H/A activity → ⬇️less K efflux

pubmed.ncbi.nlm.nih.gov/21980112/
In 💎mineral acidosis → ⬆️increased Cl/HCO3 exchange → ⬆️more K efflux

pubmed.ncbi.nlm.nih.gov/21980112/
Differences in K shift may also be due to 🌟insulin (not well defined)

acidosis → insulin release → ⬆️increase Na/K activity🌟 → K shift into cell

(It is not clear if organic acidosis causes MORE insulin release than mineral)

pubmed.ncbi.nlm.nih.gov/15153570/
pubmed.ncbi.nlm.nih.gov/3884666/
Despite knowing acidosis and hyperkalemia go hand in hand, does giving bicarb help shift K?
Anecdotally, giving bicarb does not❌ always help shift hyperkalemia.

For any given HCO3 or pH, Na/H and Na/HCO3 activity is higher in acidosis, so ⭐bicarb shifts more K in acidosis.⭐

pubmed.ncbi.nlm.nih.gov/8840939
⁉️But, you may ask, what about the kidneys?!!!!⁉️

📊What is the net effect of acidosis on renal potassium handling?
Studies show there are differential effects of 🧪acidosis and UrK, likely based on the length of acid infusion

⏲️Acute acidosis (hours) → no change in UrK
⏱️Prolonged acidosis (days) → increase UrK (and total body K lowering!)

pubmed.ncbi.nlm.nih.gov/3884666/
pubmed.ncbi.nlm.nih.gov/3105328/
In ⏲️acute acidosis, kaliuresis is inhibited by a multitude of mechanisms.

pubmed.ncbi.nlm.nih.gov/21980112/
In ⏱️prolonged acidosis,
📌increase UrNa and UrCl support the theory ⬆️increased distal Na delivery is the key🗝️

pubmed.ncbi.nlm.nih.gov/11344560/
pubmed.ncbi.nlm.nih.gov/3105328/
🤔There are 🍀4 possible explanations why distal Na delivery increases...(see gif)

In some cases of acidosis, excretion of 🙀non absorbable acidic anions increase distal Na delivery too (a 5️⃣th explanation!)

pubmed.ncbi.nlm.nih.gov/21980112/
⏱️Prolonged acidosis can also directly ⬆️stimulate aldosterone secretion (independent of renin)
pubmed.ncbi.nlm.nih.gov/3105328/
In summary,
📌Acutely, 💎mineral acidosis associated with ⭐more profound hyperkalemia than 🥬organic due to ⭐cell shifting
📌Chronic acidosis increases UrK due to ⭐increased distal Na delivery and aldo

Comments, gripes, and suggestions welcome.

pubmed.ncbi.nlm.nih.gov/21980112/

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More from @amyaimei

Dec 2
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The first case of Hz autoimmunity was in 1953, and the first series of Hz induced ANCA vasculitis overlapping with lupus was in 1984!

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1. multiple autoantibodies and anti-histone
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In the Columbia series, Hz-V pts
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buff.ly/3ZiDAh4
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🧵Let's talk hypernatremia

So often we discuss the correction rate of hyponatremia, but what about hypernatremia? #medtwitter #nephtwitter #meded

🧐What is your correction rate for chronic hypernatremia?
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“Fast” correction is generally considered to be more than 12 mEq/dL per day

pubmed.ncbi.nlm.nih.gov/20412412/
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Feb 6, 2021
The 🎩baron of kidney stone prevention has been citrate supplementation.

📖Let’s quickly review hypocitraturia and its relationship to stones.

Where is most of your citrate reabsorbed?
Which condition is ❌NOT associated with hypocitraturia?
Before we get into the #tweetorialanswers, let’s establish that hypocitraturia is a risk factor.

Previous data show around 📊46-60% of stone formers have hypocitraturia.

In Ca stone formers, hypocitraturia is the 📊sole abnormality in 10%.

pubmed.ncbi.nlm.nih.gov/32715836/
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🤔🔬Why are kidney stones so interesting?
Because the 🔑tubules > glomeruli

Disagree if you like, but it’s true.

A short thread on some mechanisms associated with calcium stones...

#nephtwitter #FOAMed #MedEd #uronephrology #kidneystone #nephrolith Image
Which is a risk factor for calcium oxalate stones?
Correct!

Risk factors for calcium oxalate stones classically include 📌hypercalciuria and 📌hyperoxaluria along with 💧low urine volume.

#Hypercalciuria can stem from a LOT of different causes and clinical settings. The most common in adults is idiopathic. Image
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Is being pregnant magical🌟?
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Why do you gain weight when you are pregnant?
The average woman ⬆️gains a plasma volume of 1250 mL (an increase of 45-55%).

Significant lab values changes include
- Plasma Na ⬇️reduced by ~ 5 mmol/L
- Plasma osmolality ⬇️reduces by ~10 mOsm/kg
- Cr ⬇️decreases by 0.3 mg/dL due to increased GFR among other changes ImageImage
There is an entire milieu of hormone changes during pregnancy🤰. Some are natriuretic and some are anti-natriuretic.

Sources: Comprehensive Clinical Nephrology Chapter 42, pubmed.ncbi.nlm.nih.gov/22879432 ImageImage
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