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J R Soc Med 1989;82:725-728
© 1989 Royal Society of Medicine

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Journal of the Royal Society of Medicine, Vol 82, Issue 12 725-728, Copyright © 1989 by Royal Society of Medicine

ORIGINAL ARTICLES

Metabolic effects of prostatectomy

PA Hamilton Stewart and IM Barlow
Department of Urology, Bradford Royal Infirmary.

Transurethral resection syndrome (TURS), complicating transurethral resection of the prostate (TURP) has been ascribed to hyponatraemia but reports have indicated that hyperammonaemia following metabolism of glycine can be the main cause. Prospective data has been collected on 96 prostatectomy patients (82 TURP and 14 retropubic). The retropubic group showed no significant postoperative change in the serum sodium or plasma ammonia. Of the TURP group, no TURS occurred although hyponatraemia was noted in 32 patients. The weight of prostate resected, the volume of glycine used, the time taken and the plasma ammonia levels were not significantly different in the normonatraemic or hyponatraemic groups. In severely hyponatraemic patients (13 out of 32 with a 10 mmol/l, or greater, decrease in serum sodium) there was a significant rise (P less than 0.05) in plasma ammonia, 1 or 4 h post TURP, which had decreased by 24 h. There was a highly significant increase in serum glycine level in the hyponatraemic compared with the normonatraemic group (P less than 0.001). There was no correlation between serum glycine and plasma ammonia levels in the normonatraemic or hyponatraemic group. There were nine patients with post TURP plasma ammonia levels greater than 100 mumol/l (mean 254) who experienced no mental confusion: six of these patients were hyponatraemic. The weight of prostate resected (mean 26 g), volume of glycine used (mean 181) and operation time (mean 39 min) were all relatively low. Subsequently, TURS has occurred in a patient, with severe hyponatraemia and hyperglycinaemia but no hyperammonaemia. This study shows that hyperammonaemia does not always correlate with hyponatraemia or hyperglycinaemia, and high plasma ammonia levels can occur in the absence of TURS.
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