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Drugs online research references

J Hypertens. 1986 Feb;4(1):27-33.
Effect of low doses of angiotensin II perfusion on the hypotensive action of captopril in anaesthetized normotensive and spontaneously hypertensive rats.

Staroukine MA, Giot JM, Verniory AE.

The effect of intravenous (i.v.) captopril on mean arterial blood pressure (MABP) of anaesthetized normotensive Wistar-Kyoto (WKY) and spontaneously hypertensive (SHR) rats perfused i.v. with two doses of angiotensin II (ANG II; 2.9 and 5.8 pmol/kg per min) was studied to determine the role of the suppression of plasma ANG II in the hypotensive action of captopril. The reduction of MABP by captopril was attenuated in WKY and abolished in SHR by the highest dose of ANG II; it was unchanged in WKY and attenuated in SHR by the lowest dose of ANG II. The suppression of plasma ANG II thus explains a minor part of the acute reduction of MABP by captopril in WKY and a major part of this action in SHR. Plasma ANG II contributes to the maintenance of high blood pressure in SHR.

online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=3514745&dopt=Abstract

J Cardiovasc Pharmacol Ther. 1998 Jan;3(1):43-50.
Prolonged Captopril Therapy in Murine Viral Myocarditis.

Reyes MP, Khatib R, Khatib G, Ho KL, Smith F, Kloner RA.

Division of Infectious Diseases, St. John Hospital, Detroit, Michigan, USA

BACKGROUND: Acute myocarditis can progress to chronic heart muscle disease and cardiomyopathy. In the coxsackievirus B(3) (CB(3)) mouse model of myocarditis, early administration of captopril, an angiotensin-converting enzyme (ACE) inhibitor, ameliorated histopathological changes in inflammation, necrosis, and calcification and reduced heart weight. Late administration of captopril reduced heart weight but did not affect the histological findings. In this study, we investigated the effects of prolonged captopril treatment in the chronic phase of this model. METHODS AND RESULTS: Three-week-old male CD(1) mice were infected with CB(3) and then randomized to receive placebo or captopril starting on day 7 of infection. Captopril, 2 g/L, was given as the drinking water daily for up to 6 months. Autopsies were performed at 6 and 10 months. Heart-to-body weight ratios were obtained, and deaths were tallied. Myocardial fibrosis was graded according to a score system. In addition, picrosirius red stain (PSR) also was used for assessment of collagen deposition. Mean heart weights were similar in both groups. Mean body weight was significantly lower in captopril-treated mice (40.7 g) than in the untreated group (43.6 g) at 6 months (P =.0155), and mortality was higher (8.7 vs 0.87%; P =.009). At 6 months, the mean myocardial fibrosis score in treated mice (0.12) was significantly less than in untreated animals (0.35; P =.035). With PSR, the mean myocardial fibrosis score in the captopril group (1.20) was also significantly less than in the untreated group (1.58; P =.045). At 10 months, fibrosis scores were similar in both groups. CONCLUSIONS: Chronic captopril treatment in CB(3) myocarditis reduces myocardial fibrosis.

online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10684480&dopt=Abstract [PubMed - as supplied by publisher]

J Cardiovasc Pharmacol Ther. 1998 Apr;3(2):161-170.
ACE Inhibitors and Renal Vascular Responses in the Spontaneously Hypertensive Rat.

Hollenberg NK, Guidi E.

Departments of Medicine and Radiology, Harvard Medical School, Boston, Massachusetts, USA

BACKGROUND: Substantial evidence has accumulated for the intrarenal generation of functionally important quantities of angiotensin II (Ang II). To assess the possibility that Ang II generation occurs beyond a barrier to diffusion from the vascular compartment, six angiotensin-converting enzyme (ACE) inhibitors varying widely in their lipid solubility were employed in the spontaneously hypertensive rat (SHR) and their normotensive controls (WKY). The biological end points were renal blood flow and its response to Ang II. RESULTS: Two ACE inhibitors, ramipril and captopril, induced a larger increase in renal blood flow and enhanced the renal vascular response to Ang II substantially more than did enalapril and lisinopril. The two prodrugs, enalapril and ramipril, which are substantially more lipophilic than the respective active drugs, enalaprilat and ramiprilat, showed equivalent responses. The partial agonist saralasin virtually abolished the renal vasodilator response to ramipril. The pattern of response was similar in WKY, but the responses were substantially smaller. CONCLUSIONS: The results support the concept that a functionally important compartment for intrarenal Ang II formation exists in the healthy rat and that this process is amplified in the SHR.

online pharmacy ref source: www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=10684494&dopt=Abstract [PubMed - as supplied by publisher]

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