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Dilutional hypocalcaemia from urological irrigating fluids

R G Hahn1

  • 1Department of Anaesthesia, South Hospital, Stockholm, Sweden.

International Urology and Nephrology
|January 1, 1997
PubMed
Summary
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Urological irrigating fluids can dilute serum calcium levels, potentially causing hypocalcaemia. Free calcium levels correlate with serum sodium, suggesting coexisting hyponatraemia in transurethral resection syndrome.

Area of Science:

  • Urology
  • Nephrology
  • Clinical Chemistry

Background:

  • Normal serum calcium is vital for cardiovascular and muscular functions.
  • Urological irrigating fluids are commonly used in procedures like prostatectomy.
  • Potential for these fluids to induce hypocalcaemia (low calcium) is a clinical concern.

Purpose of the Study:

  • To investigate the hypocalcaemia-inducing potential of urological irrigating fluids.
  • To assess the impact of these fluids on serum calcium concentrations in patients undergoing urological procedures.

Main Methods:

  • Studied 7 young men and 10 prostatectomy patients.
  • Administered 48 intravenous infusions of 1,000 ml of various irrigating fluids.
  • Monitored serum calcium and sodium levels.

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Main Results:

  • Intravenous irrigating fluids consistently diluted serum calcium concentration.
  • The degree of calcium dilution was comparable to albumin and sodium dilution.
  • Free calcium concentration showed a strong correlation with serum sodium levels.

Conclusions:

  • Dilutional hypocalcaemia is a predictable consequence of using urological irrigating fluids.
  • Patients experiencing transurethral resection syndrome may present with both hypocalcaemia and hyponatraemia (low sodium).
  • Monitoring both calcium and sodium levels is crucial in managing patients at risk.