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AT1 receptor antagonists control blood pressure (BP) effectively and reduce left ventricular hypertrophy in patients with essential hypertension. Because left ventricular hypertrophy is very common in renal transplant recipients, we examined the cardiovascular effects and the safety profile of the AT1 receptor antagonist losartan in hypertensive renal transplant recipients. In 20 renal transplant recipients with stable renal graft function 50 mg of losartan was added to the preexisting antihypertensive treatment (no angiotensin-converting enzyme inhibitors) at least 6 months after renal transplantation. Twenty-four-hour ambulatory BP, two-dimensional-guided M-mode echocardiography, and duplex sonography, as well as renal function, red blood cell count, cyclosporine A and FK 506 levels, erythropoetin, and angiotensin II concentration were determined at baseline and after 6 months of therapy. With 24-h ambulatory BP measurement, systolic blood pressure (SBP) was reduced by 7.5 +/- 2.4 mm Hg and diastolic blood pressure (DBP) by 4.5 +/- 1.8 mm Hg (P &lt; .01 and P &lt; .05, respectively). Posterior, septal, and relative wall thickness decreased by 0.95 +/- 0.2 mm, 0.91 +/- 0.2 mm and 0.04 +/- 0.01 mm, respectively (all P &lt; .001). Left ventricular mass index decreased by 18.1 +/- 4.7 g/m2 (P &lt; .01). Ejection fraction and midwall fractional fiber shortening as systolic parameters and the relation of passive-to-active diastolic filling of the left ventricle were unaltered. Serum creatinine and cyclosporine A concentration remained stable in all patients. Hemoglobin and hematocrit decreased by 1.0 +/- 0.3 g/dL and 3.6% +/- 0.9%, respectively (P &lt; .002 and P &lt; .001) without a change in serum erythropoetin level. In renal transplant recipients the AT1 receptor antagonist losartan reduces left ventricular hypertrophy without altering systolic or diastolic function. It is safe with regard to renal function and immunosuppression, but slightly decreases hemoglobin level.

Regression of left ventricular hypertrophy by at1 receptor blockade in renal transplant recipients