Differential effects of sepsis and trauma on urinary excretion of polyamines

Abstract

Urinary excretion of polyamines increases in patients with trauma and infection. To separate the effect of infection from the general metabolic response to sepsis, we studied 7 patients with sepsis and 13 patients with multiple trauma in the intensive-care unit. Urinary excretion of total and free polyamines, putrescine, spermidine, spermine, and their metabolites N1-acetylspermidine (N1-AcSPD) and N8-acetylspermidine (N8-AcSPD), and energy and nitrogen balance were measured. The patients were randomized to receive either hypocaloric glucose alone or with amino acids for 2 days. The excretion of individual polyamines, except spermine, significantly exceeded normal values in both patient groups; the excretion of total polyamines was 530 and 323% higher than normal in patients with sepsis and trauma, respectively. The excretion of N1-AcSPD and total spermidine was 141 and 74% higher in patients with sepsis than in patients with trauma, respectively (p < 0.05), whereas the excretion of N8-AcSPD was equal in both patient groups. This was also reflected as a significantly increased urinary ratio of N1-AcSPD to N8-AcSPD in septic patients (6.37 +/- 1.61; mean +/- SE) compared with patients after injury (2.69 +/- 0.27, p < 0.01) or a healthy population (1.08 +/- 0.04, p < 0.001). Amino acid infusion had no effect on polyamine excretion. The mean energy balance was -17.0 +/- 1.1 and -19.1 +/- 1.1 kcal.kg-1.day-1, and the mean nitrogen balance was -0.17 +/- 0.03 and -0.15 +/- 0.02 g.kg-1.day-1 in patients with sepsis and trauma, respectively (NS).(ABSTRACT TRUNCATED AT 250 WORDS)