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Related Experiment Videos

Metabolic effects of prostatectomy.

P A Hamilton Stewart1, I M Barlow

  • 1Department of Urology, Bradford Royal Infirmary.

Journal of the Royal Society of Medicine
|December 1, 1989
PubMed
Summary

Transurethral resection syndrome (TURS) is not always caused by hyperammonaemia. This study found that while hyponatraemia can increase ammonia, high ammonia levels do not always correlate with TURS or mental confusion.

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Area of Science:

  • Urology
  • Nephrology
  • Biochemistry

Background:

  • Transurethral resection syndrome (TURS) is a complication of transurethral resection of the prostate (TURP).
  • While traditionally attributed to hyponatraemia, emerging evidence suggests hyperammonaemia from glycine metabolism may be a primary cause.
  • The relationship between hyponatraemia, hyperammonaemia, and TURS requires further elucidation.

Purpose of the Study:

  • To investigate the correlation between hyponatraemia, hyperammonaemia, and the occurrence of TURS following prostatectomy.
  • To determine if elevated plasma ammonia levels are a consistent predictor of TURS in patients undergoing TURP.
  • To assess the role of glycine metabolism in the development of TURS.

Main Methods:

  • Prospective data collection from 96 prostatectomy patients (82 TURP, 14 retropubic).
  • Monitoring of serum sodium, plasma ammonia, and serum glycine levels post-operatively.
  • Comparison of biochemical parameters between normonatraemic and hyponatraemic groups, and correlation with TURS occurrence.

Main Results:

  • No TURS occurred in the TURP group despite hyponatraemia in 32 patients.
  • Severely hyponatraemic patients showed a significant, transient rise in plasma ammonia.
  • Elevated serum glycine was observed in hyponatraemic patients, but no correlation was found between serum glycine and plasma ammonia levels.
  • Nine patients with high plasma ammonia (>100 mumol/l) experienced no mental confusion, with six being hyponatraemic.
  • A subsequent case of TURS occurred with severe hyponatraemia and hyperglycinaemia but no hyperammonaemia.

Conclusions:

  • Hyperammonaemia does not consistently correlate with hyponatraemia or hyperglycinaemia in the context of TURP.
  • High plasma ammonia levels can occur without the development of TURS.
  • The pathophysiology of TURS is complex and may involve factors beyond simple hyponatraemia or hyperammonaemia.

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