Abstract
The majority of patients undergoing solid organ transplantation develop hypertension, to which cyclosporine (CsA)-induced peripheral vasoconstriction may contribute. We hypothesized that CsA-treated transplant recipients have an increased basal vascular tone and an altered response to nitric oxide. To test this hypothesis arterial resistance, non-endothelial dependent relaxation and arterial stiffness were investigated in CsA-treated lung transplant recipients within 18 months after transplantation. In study 1, forearm blood flow (FBF) was measured by venous occlusion plethysmography at baseline and during glyceryl trinitrate (GTN) and N(G)-monomethyl-l-arginine acetate (l-NMMA) infusion in seven lung transplant recipients and nine healthy subjects. In study 2, arterial stiffness in carotid (CCA) and radial artery (RA) was measured by ultrasound (echo-tracking) in 10 lung transplant recipients, 12 healthy subjects and six patients waiting for lung transplantation. Basal FBF (3.1 +/- 0.2 vs. 3.0 +/- 0.3 mL/min, p = 0.79) and forearm arterial resistance (36 +/- 3 vs. 33 +/- 3 mmHg/mL/min, p = 0.60) did not differ between transplant recipients and controls. GTN infusion increased and l-NMMA decreased blood flow equally in both gro...Continue Reading
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