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A rapid intravenous phosphate replacement protocol for critically ill patients.
1Department of Intensive Care, Western Hospital, Footscray, Victoria. craig.french@wh.org.au
Summary
Critically ill patients often have low phosphate levels (hypophosphataemia). Rapid phosphate infusion showed a large volume of distribution and urinary losses, informing a new replacement protocol.
Area of Science:
- Critical Care Medicine
- Nephrology
- Clinical Pharmacology
Background:
- Hypophosphataemia is common in critically ill patients, leading to adverse outcomes.
- Existing phosphate replacement regimens lack validation in critical care settings.
- Understanding phosphate distribution and loss is crucial for effective treatment.
Purpose of the Study:
- To determine the apparent volume of distribution of phosphate in critically ill patients.
- To quantify phosphate loss following rapid phosphate infusion.
- To develop a phosphate replacement protocol based on study data.
Main Methods:
- Prospective study involving rapid phosphate infusion (14.5 mmol/hr) in seven hypophosphataemic patients.
- Monitoring of serum phosphate, calcium, urea, creatinine, and urinary phosphate.
- Assessment of renal phosphate threshold and creatinine clearance over 24 hours.
Main Results:
- Median phosphate increment was 0.65 mmol/L.
- Median initial volume of distribution was 0.45 L/kg.
- No adverse effects on ionized calcium or creatinine clearance were observed.
- Reduced renal phosphate threshold noted in all patients.
Conclusions:
- The apparent volume of distribution for phosphate in critically ill patients is substantial.
- Urinary phosphate excretion is a significant factor in hypophosphataemia development.
- Rapid phosphate infusion at 14.5 mmol/hr was safe in this cohort.
- Developed data supports a rational protocol for rapid and sustained hypophosphataemia correction.