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Hyperphosphatemia: Causes, Symptoms and Treatment
Hyperphosphatemia refers to elevated phosphate levels in the blood. It is most commonly caused by kidney disease and can lead to serious damage to the heart, blood vessels, and bones.
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Hyperphosphatemia refers to elevated phosphate levels in the blood. It is most commonly caused by kidney disease and can lead to serious damage to the heart, blood vessels, and bones.
What is Hyperphosphatemia?
Hyperphosphatemia is a medical condition in which the level of phosphate in the blood rises above the normal range. In adults, normal serum phosphate levels are approximately 0.87 to 1.45 mmol/l (2.7 to 4.5 mg/dl). Values above this range indicate hyperphosphatemia. Phosphate is an essential mineral found mainly in bones and teeth and plays a key role in numerous metabolic processes. However, persistently elevated phosphate levels can cause serious damage to organs and blood vessels.
Causes
The most common cause of hyperphosphatemia is impaired kidney function, as the kidneys are normally responsible for excreting excess phosphate. Other causes include:
- Chronic kidney disease (CKD): The most frequent cause; in advanced renal failure, the kidneys can no longer adequately excrete phosphate.
- Hypoparathyroidism: Deficiency of parathyroid hormone (PTH) leads to reduced phosphate excretion by the kidneys.
- Rhabdomyolysis: Breakdown of muscle cells releases large amounts of phosphate into the bloodstream.
- Tumor lysis syndrome: Rapid destruction of tumor cells (e.g., following chemotherapy) releases large quantities of phosphate.
- Excessive phosphate intake: Through a phosphate-rich diet or overuse of phosphate-containing supplements.
- Vitamin D toxicity: Leads to increased phosphate absorption in the intestine.
- Acidosis: In conditions such as diabetic ketoacidosis, phosphate shifts out of cells into the bloodstream.
Symptoms
Mild hyperphosphatemia often causes no symptoms and is discovered incidentally during blood tests. With higher levels or prolonged duration, the following symptoms may occur:
- Hypocalcemia-related symptoms: Elevated phosphate binds calcium in the blood, which can cause muscle cramps (tetany), tingling, and numbness.
- Calcifications: Deposits of calcium-phosphate compounds in soft tissues, blood vessels, and joints, leading to pain and reduced mobility.
- Itching: Common in patients with kidney failure due to deposits in the skin.
- Bone pain and bone loss: Long-term hyperphosphatemia can lead to renal osteodystrophy.
- Cardiovascular complications: Vascular calcification increases the risk of heart attack and stroke.
Diagnosis
Diagnosis is primarily made through a blood test measuring serum phosphate. Additional parameters frequently assessed include:
- Serum calcium and ionized calcium
- Parathyroid hormone (PTH)
- Kidney function markers (creatinine, GFR, urea)
- Vitamin D levels (25-OH vitamin D and 1,25-OH vitamin D)
- Urinary phosphate (to assess renal excretion)
Imaging techniques such as X-rays or bone density measurements may be used to detect calcifications or bone loss.
Treatment
Treatment depends on the underlying cause and severity of hyperphosphatemia:
Dietary Measures
A low-phosphate diet is a core component of management. Foods high in phosphate should be avoided, including dairy products, legumes, nuts, whole grains, and foods containing phosphate additives (e.g., E338, E339, E340).
Phosphate Binders
Phosphate binders are taken with meals to prevent phosphate absorption from the gut. These include:
- Calcium-based binders (e.g., calcium carbonate, calcium acetate): Cost-effective, but carry a risk of over-calcification.
- Non-calcium-based binders (e.g., sevelamer, lanthanum carbonate): Preferred in patients with a high risk of calcification.
- Iron-based binders (e.g., sucroferric oxyhydroxide): A newer option with an additional benefit for iron metabolism.
Dialysis
In patients with end-stage renal failure, regular hemodialysis or peritoneal dialysis can help remove phosphate, although dialysis alone is often insufficient.
Treatment of the Underlying Condition
Addressing the underlying disease (e.g., optimizing kidney function, treating hypoparathyroidism) is essential for long-term phosphate control.
References
- Kidney Disease: Improving Global Outcomes (KDIGO) - KDIGO 2017 Clinical Practice Guideline Update for the Diagnosis, Evaluation, Prevention, and Treatment of Chronic Kidney Disease-Mineral and Bone Disorder (CKD-MBD). Kidney Int Suppl. 2017;7(1):1-59.
- Blaine J, Chonchol M, Levi M - Renal Control of Calcium, Phosphate, and Magnesium Homeostasis. Clin J Am Soc Nephrol. 2015;10(7):1257-1272.
- Ketteler M et al. - Executive summary of the 2017 KDIGO Chronic Kidney Disease-Mineral and Bone Disorder (CKD-MBD) Guideline Update. Nephrol Dial Transplant. 2018;33(1):8-29.
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