Severe Hypophosphatemia After Zoledronate in a Young Adult With Malnutrition and Long-Term Parenteral Nutrition
Bibliographic record
Abstract
Background/Objective: Zoledronic acid, a third-generation bisphosphonate, is widely used to treat osteoporosis. Mild hypophosphatemia is relatively common after zoledronic acid, but severe cases are rare and under-recognized. We report a case of severe, sustained hypophosphatemia following zoledronic acid administration in a nutritionally vulnerable inpatient receiving long-term total parenteral nutrition. The objective of this report is to describe a patient who developed this complication, emphasizing nutritional vulnerability as an important risk factor. Case Report: A 31-year-old male with chronic malnutrition and prolonged total parenteral nutrition requirement due to complications of bowel disease was referred for assessment of multiple vertebral compression fractures. Baseline serum calcium, phosphate, magnesium, and renal function were normal. His 25-hydroxyvitamin D was 50 nmol/L and supplemented prior to zoledronic acid 4 mg intravenous administration. Two days later, his serum phosphate dropped to <0.30 mmol/L. Although asymptomatic, he required 5 days of intravenous phosphate replacement. Levels normalized by day 9. Discussion: This case illustrates that bisphosphonate-induced suppression of bone resorption, when superimposed on chronic phosphate depletion, recent nutritional repletion, and borderline vitamin D status may contribute to acute severe hypophosphatemia- even when baseline labs appear normal. In contrast to most previous reports involving malignancy or renal dysfunction, this case occurred in a patient with nutritional compromise and no history of malignancy or renal disease. Conclusion: Clinicians should recognize malnutrition, refeeding physiology, and total parenteral nutrition dependence as important risk factors for bisphosphonate-induced hypophosphatemia. Targeted phosphate monitoring and nutritional optimization should be considered before and after bisphosphonate therapy in nutritionally vulnerable individuals.
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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 | 0.000 |
| 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".