Abstract
Patients with cancer are at risk for metabolic disorders. The pathophysiologies include organic dysfunction due to systemic dissemination, dysfunction due to anticancer treatment, paraneoplastic metabolic changes due to tumor proliferation mechanisms, and metabolites production. The main metabolic emergencies in cancer patients are the tumor lysis syndrome, hypercalcemia, hyponatremia, and adrenal insufficiency.
Tumor lysis syndrome is characterized by various electrolyte abnormalities, including hyperkalemia, hyperphosphatemia, hyperuricemia, hypocalcemia, and metabolic acidosis. Trigger factors are an increased lactic dehydrogenase, solid tumors with a large volume disease, rapid tumor growth, or a high sensitivity to chemotherapy. Treatment is based on maintaining urinary output, stimulating potassium and phosphorus excretion, and avoiding the precipitation of calcium and uric acid in the renal tubules. It is necessary to consider early hemodialysis in those with renal insufficiency.
Hypercalcemia is the main electrolyte disturbance in cancer patients. The main differential diagnosis is primary hyperparathyroidism; however, in cancer, the parathyroid hormone values are low or normal. Venous hydration and bisphosphonates have a great impact on malignant hypercalcemia. When the blood volume is restored, it is important to consider the use of diuretics. Hyponatremia occurs generally because of the ectopic production of the antidiuretic hormone-like effect in cancer patients, which causing inappropriate antidiuretic hormone action. The treatment aims to increase the serum sodium with parenteral solutions.
Adrenal insufficiency is caused by the metastatic spread to the adrenal glands or by the chronic use of corticosteroids. In cases of hemodynamic instability, corticosteroid replacement must be administered intravenously and immediately.
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Barreto, C.M.N., Della Vega, M.C.M., de Almeida, M.S., Tadokoro, H., de Mello, R.A. (2015). Metabolic Disturbance in Cancer Patients. In: de Mello, R., Tavares, Á., Mountzios, G. (eds) International Manual of Oncology Practice. Springer, Cham. https://doi.org/10.1007/978-3-319-21683-6_33
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DOI: https://doi.org/10.1007/978-3-319-21683-6_33
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