| Losartan exerts no protective effects against acute pulmonary embolism-induced hemodynamic changes. | |
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MedLine Citation:
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PMID: 21964667 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The acute obstruction of pulmonary vessels by venous thrombi is a critical condition named acute pulmonary embolism (APE). During massive APE, severe pulmonary hypertension may lead to death secondary to right heart failure and circulatory shock. APE-induced pulmonary hypertension is aggravated by active pulmonary vasoconstriction. While blocking the effects of some vasoconstrictors exerts beneficial effects, no previous study has examined whether angiotensin II receptor blockers protect against the hemodynamic changes associated with APE. We examined the effects exerted by losartan on APE-induced hemodynamic changes. Hemodynamic evaluations were performed in non-embolized lambs treated with saline (n = 4) and in lambs that were embolized with silicon microspheres and treated with losartan (30 mg/kg followed by 1 mg/kg/h, n = 5) or saline (n = 7) infusions. The plasma and lung angiotensin-converting enzyme (ACE) activity were assessed using a fluorometric method. APE increased mean pulmonary arterial pressure (MPAP) and pulmonary vascular resistance index (PVRI) by 21 ± 2 mmHg and 375 ± 20 dyn s cm(-5) m(-2), respectively (P < 0.05). Losartan decreased MPAP significantly (by approximately 15%), without significant changes in PVRI and tended to decrease cardiac index (P > 0.05). Lung and plasma ACE activity were similar in both embolized and non-embolized animals. Our findings show evidence of lack of activation of the renin-angiotensin system during APE. The lack of significant effects of losartan on the pulmonary vascular resistance suggests that losartan does not protect against the hemodynamic changes found during APE. |
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Authors:
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Carlos A Dias-Junior; Evandro M Neto-Neves; Marcelo F Montenegro; Jose E Tanus-Santos |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2011-10-2 |
Journal Detail:
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Title: Naunyn-Schmiedeberg's archives of pharmacology Volume: - ISSN: 1432-1912 ISO Abbreviation: - Publication Date: 2011 Oct |
Date Detail:
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Created Date: 2011-10-3 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 0326264 Medline TA: Naunyn Schmiedebergs Arch Pharmacol Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Affiliation:
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Department of Pharmacology, Campus Centro-Oeste Dona Lindu, Federal University of Sao Joao Del Rei, Rua Sebastiao Goncalves Coelho, 400, 35501-296, Divinopolis, MG, Brazil. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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