Missing the Obvious? A Story of Salt, Water, and Unexplained Hyperkalemia
Bibliographic record
Abstract
Introduction: Most clinicians are familiar with the differential diagnosis of hyperkalemia, from pseudohyperkalemia to rare tubulopathies. Herein, we describe three patients with years-long histories of unexplained hyperkalemia despite extensive investigations (details in Table 1). While all achieved normokalemia with various prescription regimens, the underlying etiology remained elusive. We suggest that all cases were likely due to chronic, mild hypovolemia in the context of self-imposed dietary salt restriction. Case Description: Patient A: A 6-week-old girl with persistent hyperkalemia and very low urine Na+. Normokalemia was achieved with hydrochlorothiazide and dietary K+ restriction but maintained with optimized fluid and Na+ intake alone. Patient B: An 11-year-old boy with spastic cerebral palsy with persistent hyperkalemia after a mild AKI attributed to rhabdomyolysis. Serum K+ improved with sodium polystyrene (SPS) and dietary K+ restriction; it normalized after IV saline infusion, while NPO. Patient C: A 5-month-old boy with Stüve-Wiedemann Syndrome and feeding difficulties with persistent hyperkalemia that normalized on SPS. After G-tube insertion at 2 years, K+ remained normal despite stopping the SPS due to improved fluid and Na+ intake. Discussion: It has long been established that adequate Na+ and fluid delivery to distal nephrons is necessary for optimal K+ handling. It is therefore surprising to find almost no mention of Na+-responsive hyperkalemia in the literature for children beyond the neonatal period. Our patients all had hyperkalemia in the context of normonatremia, but very low fractional excretion of Na+ (FeNa) and low trans-tubular K+ gradient (TTKG). They all remained normokalemic when salt and water intake was optimized, despite stopping their hyperkalemic prescriptions. Careful, early consideration of low distal Na+ and water delivery as a cause for unexplained hyperkalemia could prevent extensive workups and unnecessary prescriptions.Relevant investigations
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".