Addition of Pioglitazone and Ramipril to Intensive Insulin Therapy in Type 2 Diabetic Patients Improves Vascular Dysfunction by Different Mechanisms  

Oleh:

Fernandez, Marianella ; Triplitt, Curtis ; Wajcberg, Estela ; Sriwijilkamol, Apiradee A. ; Musi, Nicholas ; Cusi, Kenneth ; DeFronzo, Ralph ; Cersosimo, Eugenio

Jenis: Article from Journal - ilmiah internasional
Dalam koleksi: Diabetes Care vol. 31 no. 01 (Jan. 2008), page 121.
Topik: ARB; angiotensin II receptor blockade ; CSII; continuous subcutaneous insulin infusion ; FBF; forearm blood flow ; hsCRP; high-sensitivity C-reactive protein ; IL; interleukin ; MDII; multiple daily insulin injection ; TZD; thiazolidinedione

Ketersediaan

Perpustakaan FK Nomor Panggil: D05.K.2008.01 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

OBJECTIVE—We examined the relationship between glycemic control, vascular reactivity, and inflammation in type 2 diabetic subjects. RESEARCH DESIGN AND METHODS—Thirty subjects with type 2 diabetes were initiated on intensive insulin therapy (continuous subcutaneous insulin infusion [n = 12] or multiple daily injections [n = 18]) and then randomized to either pioglitazone (PIO group;45 mg/day), ramipril (RAM group; 10 mg/day), or placebo (PLC group) for 36 weeks. Euglycemic-hyperinsulinemic clamp was used to quantify insulin resistance, and plethysmography was used to assess changes in forearm blood flow (FBF) after 1) 5 min of reactive hyperemia and 2) brachial artery infusion of acetylcholine (7.5, 15, and 30 µg/min) and sodium nitroprusside (3 and 10 µg/min). RESULTS—The decreases in A1C (9.0–7.0%) and fasting plasma glucose (190–128 mg/dl) were equal in all groups. In the PIO group, glucose disposal increased from 3.1 to 4.7 mg · kg–1 · min–1, and there was a greater decrease in plasma triglycerides (148 vs. 123 mg/dl) and free fatty acids (838 vs. 595 mEq/l) compared with the RAM or PLC groups (P < 0.05). Plasma adiponectin doubled with pioglitazone treatment (6.2 ± 0.7 to 13.1 ± 1.8 µg/ml), while endothelin-1 decreased only with ramipril treatment (2.5 ± 0.2 to 1.1 ± 0.2 pg/ml) (P < 001). The increase in FBF during reactive hyperemia (215%) and acetylcholine (from 132 to 205%, 216 to 262%, and 222 to 323%) was greater in the PIO versus RAM or PLC groups. In contrast, FBF during sodium nitroprusside treatment was greater in the RAM group (141–221% and 218–336%) compared with the PIO or PLC groups (all P < 0.05). CONCLUSIONS—Addition of pioglitazone or ramipril to intensive insulin therapy in type 2 diabetes further improves vascular dysfunction. Pioglitazone enhances endothelial-mediated vasodilation, whereas ACE inhibition enhances endothelial-independent vasodilation. These different vascular effects, combined with the observation that pioglitazone decreases free fatty acids and triglycerides and increases adiponectin, while ramipril reduces endothelin-1, suggest that different mechanisms underlie the vascular responses.

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