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Published on: May 26, 2022
Irbesartan has no short-term effect on insulin resistance in hypertensive patients with additional cardiometabolic
K G Parhofer1, K I Birkeland, R DeFronzo
1Medizinische Klinik II, Grosshadern, Klinikum der Universitaet, Munich, Germany. Klaus.Parhofer@med.unimuenchen.de
Insights
Irbesartan did not improve insulin resistance in hypertensive patients with metabolic syndrome compared to hydrochlorothiazide. However, irbesartan showed benefits in reducing inflammation and microalbuminuria.
Area of Science:
- Cardiology
- Endocrinology
- Pharmacology
Background:
- Angiotensin receptor blockers (ARBs) may reduce type 2 diabetes mellitus incidence.
- The effect of short-term ARB therapy on metabolic parameters is not well-defined.
Purpose of the Study:
- To evaluate the effect of irbesartan versus hydrochlorothiazide (HCTZ) on metabolic parameters.
- To assess insulin resistance, lipid profiles, and inflammatory markers in hypertensive patients with metabolic syndrome.
Main Methods:
- A 16-week randomized, controlled, double-blind trial (i-RESPOND).
- Participants received irbesartan or HCTZ, with dose titration.
- A subsequent 12-week period involved cross-over treatment.
Main Results:
- Neither irbesartan nor HCTZ affected insulin resistance or beta-cell function at 16 weeks.
- Irbesartan significantly reduced high-sensitivity C-reactive protein (hs-CRP) and urinary albumin/creatinine ratio (ACR) compared to HCTZ.
- Both treatments were well-tolerated with comparable adverse events.
Conclusions:
- Irbesartan did not demonstrate superior effects on insulin resistance compared to HCTZ.
- Irbesartan may offer benefits for inflammation and microalbuminuria in hypertensive patients with metabolic syndrome.
Aims:
Intervention studies have shown that angiotensin receptor blockers (ARB) may reduce the incidence of type 2 diabetes mellitus. It is currently unclear whether short-term therapy with ARBs affects metabolic parameters.
Methods:
i-RESPOND, a randomised, controlled, multicentre, double-blind study evaluated the effect of 16 weeks of irbesartan vs. hydrochlorothiazide (HCTZ) on insulin resistance as well as on lipid and inflammatory parameters in hypertensive subjects with metabolic syndrome. Patients received irbesartan (150 mg/d; n = 211) or HCTZ (12.5 mg/d; n = 215), titrated to 300 mg/day and 25 mg/day respectively. In a second part of the study (weeks 16-28), patients initially randomised to irbesartan received additional HCTZ and vice versa.
Results:
At week 16 both irbesartan and HCTZ had no effect on insulin resistance measured by the Matzuda index and beta-cell function. Similarly, in the second part of the study (week 16-28) no differences between irbesartan and HCTZ with respect to glucose metabolism were observed. However, irbesartan induced beneficial changes in high-sensitivity-C-reactive protein (hs-CRP) (irbesartan: -5.5 +/- 5.2%; HCTZ + 19.9 +/- 6.5%, p = 0.0024) and in urinary albumin/creatinine ratio (ACR) (irbesartan: -13%; HCTZ + 9%; p = 0.0041) compared with HCTZ despite a similar decrease in blood pressure in both treatment groups. Irbesartan and HCTZ were well tolerated and adverse events were comparable.
Conclusion:
Irbesartan did not show significant favourable effects on insulin resistance compared with HCTZ in this study; however, may have beneficial effects on inflammation and microalbuminuria in hypertensive patients with metabolic syndrome.
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