SAT195 A Curious Case Of Severe Reversible PTH-mediated Hypercalcemia Of Pregnancy
Bibliographic record
Abstract
Abstract Disclosure: I. Albanese: None. N. Nicolas: None. S.S. Wing: Grant Recipient; Self; Pfizer Global R&D. Other; Self; Almac Discovery (Independent Contractor). E. Mitmaker: None. L. Vautour: None. Background: Primary hyperparathyroidism is rarely diagnosed in pregnancy as symptoms may overlap with those of pregnancy and biochemical diagnosis may be masked by physiologic changes in calcium homeostasis. Hyperparathyroidism in pregnancy is associated with increased maternal and fetal complications. While mild disease is treated conservatively, moderate to severe disease is generally treated surgically in the second trimester. Safe pharmacotherapy options are limited in pregnancy. Case: A 35-year-old woman G3P1 at 10 weeks presented to our institution with polyuria, bone pain and weakness with labs demonstrating severe hypercalcemia (Calcium total: 3.82mmol/L (normal: 2.12-2.62); PTHi: 12pmol/L (normal: 1.5-9.3)). PTHrP was suppressed. She had a prior history of PTH-mediated hypercalcemia in her first pregnancy. She previously underwent three exploratory surgeries in which only three parathyroid glands were found and removed. The hyperparathyroidism and hypercalcemia persisted post-operatively thus she also required intravenous fluids, calcitonin and cinacalcet. The pregnancy was otherwise uncomplicated. Post-partum, she developed hypoparathyroidism and hypocalcemia. Throughout this current pregnancy, multiple imaging modalities were used (ultrasound, MRI and parathyroid sestamibi), none of which were unable to localize any hyperfunctioning parathyroid tissue. Thus, management was limited to medical therapy. Despite aggressive hydration, calcitonin and cinacalcet, total calcium and PTH levels consistently rose reaching peaks of 4.06mmol/L and 45.4pmol/L, respectively. Given hypercalcemia severity and associated neurological symptoms, she was also given bisphosphonates (pamidronate 60mg and zoledronic acid 4mg). She underwent C-section at 25+3 weeks due to fetal decelerations and placental insufficiency. She again developed hypoparathyroidism and hypocalcemia 1-week post-partum. Genetic testing was negative for any causes of hyperparathyroidism. Discussion: This is a unique case of severe PTH-mediated hypercalcemia in that the exact mechanism is unknown but appears to be pregnancy-mediated and reversible such that it only occurs in pregnancy with subsequent hypoparathyroidism post-partum. Investigations to better elucidate the mechanism of this are ongoing. Presentation: Saturday, June 17, 2023
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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 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| 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".