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Department of General Internal Medicine, Cardiovascular Research Institute, Academic Medical Centre, Amsterdam, The Netherlands. d.boon@amc.uva.nl
OBJECTIVES: To investigate the acute hemodynamic effects of peritoneal dialysis (PD) using the noninvasive Portapres technique [TNO Biomedical Instrumentation (TNO BMI); Amsterdam, The Netherlands]. DESIGN AND METHODS: Blood pressure was measured in 21 consecutive patients on continuous ambulatory PD during a standard peritoneal permeability analysis (SPA). Blood pressure, stroke volume, cardiac output, and total peripheral resistance were recorded and calculated using continuous finger pressure recordings with Portapres and Modelflow software (TNO BMI). The SPA consists of four phases: (1) drainage of night dwell dialysate, (2) instillation of a rinsing solution (1.36% glucose), (3) drainage of rinsing solution, and (4) instillation of the test solution (3.86% glucose to which dextran 70 has been added). RESULTS: Both systolic blood pressure (SBP) (7 +/- 9 mmHg, p < 0.005) and diastolic blood pressure (DBP) (5 +/- 6 mmHg, p < 0.01) increased during phase 2. Systolic BP and DBP increased further during phase 4 (SBP 8 +/- 14 mmHg, p < 0.05; DBP 6 +/- 8 mmHg, p < 0.005). These BP increases were caused by a rise in total peripheral resistance of 10% +/- 18% (p< 0.05) during phase 1, and 15% +/- 21% (p < 0.005) during phase 2. CONCLUSIONS: Instillation and dwell of a dialysis solution during PD causes a rise in blood pressure. This is caused by an increase in total peripheral resistance. Factors influencing total peripheral resistance could be a direct mechanical effect of dialysate on mesenteric resistance vessels or a temperature-related effect.
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