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[Life threatening hypercalcemia in a young man with ALL].

HISTORY AND ADMISSION FINDINGS
A 16-year-old man experienced fatigue, vomiting and diffuse abdominal pain. Since 4 days he had myalgia in both arms and legs. On examination only a tachycardia of 110/min was noticed.


INVESTIGATIONS
Laboratory tests revealed hemoglobin 12.7 g/dl, leucocytes 10,300/microliter, platelets 89,000/microliter, LDH 191 U/l, sodium 134 mmol/l, potassium 2.76 mmol/l, calcium 4.52 mmol/l (I), creatinine 1.13 mg/dl, urea 72 mg/dl, uric acid 11.2 mg/dl. The levels of PTH (0 pg/ml), PTH-related peptide, vitamin D, vitamin A, IGF-1, STH, 5-HIES and interleukin 6 were within normal limits. TNF-alpha 25.9 pg/ml (< 8.1). The electrocardiography revealed a sinus rythm with a QT-time of 0.28 s (= 100%). Multiple osteolytic bone leasions were seen in thoracic CT-scan. Abdominal sonography showed normal liver structure, multiple subhepatic lymph nodes without splenomegaly. The cytologic examination of the bone marrow demonstrated a diffuse infiltration by a common acute leukemia.


TREATMENT AND COURSE
The rehydration with physiologic saline (3500 ml/d) was initiated in the ICU. Furosemide was added for further renal excretion. Additionally prednisone (100 mg/d) and calcitonin (300 I.E./d) were given. The calcium level fell within two days. No cardiac arrhythmia nor acute renal failure were seen. After definitive diagnosing the patient was treated corresponding to a specific protocol. One year later the relapsing ALL was diagnosed also by hypercalcemia (5.9 mmol/l). The level of TNF-alpha before and after correction of hypercalcemia was 20 pg/ml.


CONCLUSION
The acute treatment of hypercalcemia is independent of the underlying cause (rehydration with physiologic saline, renal excretion with furosemide, inhibition of osteoclastic activity). The main causes are hyperparathyreoidism or malignancys (90%). We describe TNF-alpha as a possible marker of tumoral load of a common ALL but we are not able to reveal a correlation between TNF-alpha and the calcium level.