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Diabetes Care. 2009 Oct;32(10):1873-9. doi: 10.2337/dc09-0168. Epub 2009 Jul 8.

Renal effects of aliskiren compared with and in combination with irbesartan in patients with type 2 diabetes, hypertension, and albuminuria.

Author information

1
Steno Diabetes Center, Gentofte, Denmark. frip@steno.dk

Abstract

OBJECTIVE:

We investigated whether the antiproteinuric effect of the direct renin inhibitor aliskiren is comparable to that of irbesartan and the effect of the combination.

RESEARCH DESIGN AND METHODS:

This was a double-blind, randomized, crossover trial. After a 1-month washout period, 26 patients with type 2 diabetes, hypertension, and albuminuria (>100 mg/day) were randomly assigned to four 2-month treatment periods in random order with placebo, 300 mg aliskiren once daily, 300 mg irbesartan once daily, or the combination using identical doses. Patients received furosemide in a stable dose throughout the study. The primary end point was a change in albuminuria. Secondary measures included change in 24-h blood pressure and glomerular filtration rate (GFR).

RESULTS:

Placebo geometric mean albuminuria was 258 mg/day (range 84-2,361), mean +/- SD 24-h blood pressure was 140/73 +/- 15/8 mmHg, and GFR was 89 +/- 27 ml/min per 1.73 m(2). Aliskiren treatment reduced albuminuria by 48% (95% CI 27-62) compared with placebo (P < 0.001), not significantly different from the 58% (42-79) reduction with irbesartan treatment (P < 0.001 vs. placebo). Combination treatment reduced albuminuria by 71% (59-79), more than either monotherapy (P < 0.001 and P = 0.028). Fractional clearances of albumin were significantly reduced (46, 56, and 67% reduction vs. placebo). Twenty-four-hour blood pressure was reduced 3/4 mmHg by aliskiren (NS/P = 0.009), 12/5 mmHg by irbesartan (P < 0.001/P = 0.002), and 10/6 mmHg by the combination (P = 0.001/P < 0.001). GFR was significantly reduced 4.6 (95% CI 0.3-8.8) ml/min per 1.73 m(2) by aliskiren, 8.0 (3.6-12.3) ml/min per 1.73 m(2) by irbesartan, and 11.7 (7.4-15.9) ml/min per 1.73 m(2) by the combination.

CONCLUSIONS:

The combination of aliskiren and irbesartan is more antiproteinuric in type 2 diabetic patients with albuminuria than monotherapy.

TRIAL REGISTRATION:

ClinicalTrials.gov NCT00464880.

PMID:
19587362
PMCID:
PMC2752919
DOI:
10.2337/dc09-0168
[Indexed for MEDLINE]
Free PMC Article

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