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Circulation. 1991 May;83(5):1771-9.
Cardioreparative effects of lisinopril in rats with genetic hypertension and left ventricular hypertrophy.

Brilla CG, Janicki JS, Weber KT.

Cardiovascular Institute, Michael Reese Hospital, University of Chicago Pritzker School of Medicine.

BACKGROUND. In genetic and acquired hypertension, a structural remodeling of the nonmyocyte compartment of the myocardium, including the accumulation of fibrillar collagen within the interstitium and adventitia of intramyocardial coronary arteries and a medial thickening of these vessels, represents a determinant of pathological hypertrophy that leads to ventricular dysfunction. METHODS AND RESULTS. To evaluate the benefit of angiotensin converting enzyme inhibition in reversing this interstitial and vascular remodeling in the rat with genetic spontaneous hypertension (SHR) and established left ventricular hypertrophy (LVH), we treated 14-week-old male SHR with oral lisinopril (average dose, 15 mg/kg/day) for 12 weeks. Myocardial stiffness and coronary vascular reserve to adenosine (800 micrograms/min) were examined in the isolated heart; myocardial collagen and intramural coronary artery architecture were analyzed morphometrically. In lisinopril-treated SHR compared with 14-week-old baseline or 26-week-old untreated SHR and age- and sex-matched Wistar-Kyoto (WKY) controls, we found 1) a regression in LVH and normalization of blood pressure, 2) a complete regression of interstitial fibrosis, represented by a decrease of interstitial collagen volume fraction from 7.0 +/- 1.3% to 3.2 +/- 0.3% (p less than 0.025; WKY, 2.8 +/- 0.5%), 3) normalization of myocardial stiffness constant from 19.5 +/- 0.9 to 13.7 +/- 1.3 (p less than 0.025; WKY, 13.8 +/- 2.2), 4) a reversal of intramural coronary artery remodeling, including a decrease in the ratio of perivascular fibrosis to vessel lumen size from 1.4 +/- 0.2 to 0.4 +/- 0.1 (p less than 0.025; WKY, 0.6 +/- 0.1) and medial thickening from 12.3 +/- 0.6 to 7.4 +/- 0.5 microns (p less than 0.005; WKY, 7.4 +/- 0.4 microns), and 4) a restoration of coronary vasodilator response to adenosine from 12.3 +/- 0.9 to 26.0 +/- 1.4 ml/min/g (p less than 0.005; WKY, 21.8 +/- 2.2 ml/min/g). Thus, in SHR with LVH and adverse structural remodeling of the cardiac interstitium, lisinopril reversed fibrous tissue accumulation and medial thickening of intramyocardial coronary arteries and restored myocardial stiffness and coronary vascular reserve to normal. CONCLUSIONS. These cardioreparative properties of angiotensin converting enzyme inhibition may be valuable in reversing left ventricular dysfunction in hypertensive heart disease.

online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=1850668&dopt=Abstract

J Hypertens Suppl. 1992 Jul;10(5):S21-7.
Vascular endothelium, mechanical properties of the arterial wall and local angiotensin converting enzyme inhibition.

Levy BI, Stefas L, Babalis D, Benetos A.

Institut National de la Sante et de la Recherche Medicale, Hopital Lariboisiere, Paris, France.

METHODS: An experimental model of in situ isolated carotid arteries was used to study the contribution made by angiotensin II (Ang II) towards the mechanical properties of the arterial wall in 12-week-old Wistar-Kyoto (WKY) and spontaneously hypertensive (SHR) rats. The effects of local incubation with saralasin (Sar1-Thr8-Ang II, 10(-6) mol/l) and with lisinopril (5 x 10(-6) mol/l) on carotid compliance were compared to the effects of removing the endothelium and the effects of totally abolishing vasomotor tone with potassium cyanide (0.1 mg/ml). RESULTS: With an intact endothelium, local incubation with lisinopril increased carotid compliance by 23% in WKY rats (P less than 0.05) and by 14% in SHR (P less than 0.01). Under the same experimental conditions, saralasin increased carotid compliance by 24% in WKY rats and 23% in SHR relative to control values (P less than 0.05 and P less than 0.001, respectively). Removal of the endothelium induced significant increases in carotid compliance in WKY rats (17%, P less than 0.01) and in SHR (33%, P less than 0.001). After removal of the endothelium, there was no further increase in carotid compliance with lisinopril in either strain. In contrast, saralasin induced further significant compliance increases in both strains (+18%, P less than 0.001, and +11%, P less than 0.01, in WKY and SHR, respectively). After the artery had been poisoned with potassium cyanide, there was no further increase in compliance relative to values obtained with saralasin in either strain with or without the endothelium. CONCLUSIONS: These findings suggest that Ang II receptors have a major effect on the control of basal vasomotor tone of large arteries in both normotensive and hypertensive rats. Furthermore, the increase in carotid compliance induced by local incubation with saralasin and with angiotensin converting enzyme (ACE) inhibitors may involve similar mechanisms acting on smooth muscle angiotensin receptors.

online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=1328566&dopt=Abstract

Circ Res. 1990 Feb;66(2):321-8.
Endothelium-dependent mechanical properties of the carotid artery in WKY and SHR. Role of angiotensin converting enzyme inhibition.

Levy BI, Benessiano J, Poitevin P, Safar ME.

Institut National de la Sante et de la Recherche Medicale, Hopital Lariboisiere, Paris, France.

An experimental model of in situ isolated carotid arteries has been used to evaluate the static mechanical properties of the arterial wall in 12-week-old Wistar-Kyoto rats (WKY) and spontaneously hypertensive rats (SHR). The effects of endothelium removal and of local incubation with the converting enzyme inhibitor lisinopril (ICI Pharma 209000) on the carotid compliance (CC) were compared with the effects of total abolition of the vascular smooth muscle tone by potassium cyanide. CC measured for pressures ranging from 50 to 175 mm Hg had maximal values (0.22 +/- 0.07 microliter/mm Hg and 0.13 +/- 0.03 microliter/mm Hg, respectively, for WKY and SHR, p less than 0.001) for pressure values close to the operating pressures in both groups. Maximal values of CC were increased by 35% and 45% in WKY and SHR, respectively, after potassium cyanide poisoning (p less than 0.01). The endothelium removal induced a significant increase in CC compared with their control values (+37%, p less than 0.01, and +25%, p less than 0.01, respectively, in WKY and SHR). CC measured after endothelium removal did not significantly differ from its values measured after potassium cyanide poisoning in normotensive animals. In contrast, in hypertensive animals, CC was significantly lower after endothelium, removal than after potassium cyanide poisoning (p less than 0.01). In the presence of intact endothelium, local incubation with converting enzyme inhibitor increased CC by 23% (p less than 0.05) in WKY rats and by 14% (p less than 0.01) in SHR. In contrast, after endothelium removal, converting enzyme inhibitors did not significantly increase further CC in either strain.(ABSTRACT TRUNCATED AT 250 WORDS)

online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=2153469&dopt=Abstract

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