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Article: Magnesium sulfate and diphenylhydantoin relax canine middle cerebral artery contracted with the thromboxane-A2 analogue U46619 by different mechanisms: Implications for the management of eclampsia
Title | Magnesium sulfate and diphenylhydantoin relax canine middle cerebral artery contracted with the thromboxane-A2 analogue U46619 by different mechanisms: Implications for the management of eclampsia |
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Authors | |
Keywords | Cerebral Vasospasm Diphenylhydantoin Magnesium Sulfate |
Issue Date | 1994 |
Publisher | Informa Healthcare. The Journal's web site is located at http://www.tandf.co.uk/journals/titles/10641955.asp |
Citation | Hypertension In Pregnancy, 1994, v. 13 n. 1, p. 51-60 How to Cite? |
Abstract | Objectives: To investigate the relaxant effect of MgSO4 and diphenylhydantoin on isolated canine middle cerebral artery (MCA) rings contracted with the thromboxane-A2 analogue U46619. Methods: Canine MCA rings, with and without endothelium, were suspended in organ chambers for isometric tension recording, they were contracted with U46619 in the presence of indomethacin, with and without nitro-L-arginine (NLA). Cumulative dose-response curves were performed using MgSO4 (10-8 M to 10-2 M) and diphenylhydantoin (10-9 M to 10-3 M). Main Outcome Measures: Tension at each concentration of the study drug expressed as a percentage of the maximum tension developed with U46619; area under the concentration response curve. Results: Both MgSO4 and diphenylhydantoin relaxed the MCA rings irrespective of the presence of endothelium. Diphenylhydantoin caused an endothelium-dependent relaxation at concentrations above 3x10-5 M, unaffected by NLA. Conclusions: MgSO4 relaxes canine MCA by a direct smooth muscle effect independent of the endothelium. Diphenylhydantoin causes an endothelium-dependent relaxation of canine MCA at concentrations above 3x10-5 M, unrelated to nitric oxide. MgSO4 and diphenylhydantoin may both help to prevent seizures in patients with eclampsia by reducing the potential for cerebral vasospasm. |
Persistent Identifier | http://hdl.handle.net/10722/171145 |
ISSN | 2021 Impact Factor: 2.698 2020 SCImago Journal Rankings: 0.752 |
DC Field | Value | Language |
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dc.contributor.author | Belfort, MA | en_US |
dc.contributor.author | Saade, GR | en_US |
dc.contributor.author | Moise Jr, KJ | en_US |
dc.contributor.author | Kirshon, B | en_US |
dc.contributor.author | Vanhoutte, PM | en_US |
dc.date.accessioned | 2012-10-30T06:12:23Z | - |
dc.date.available | 2012-10-30T06:12:23Z | - |
dc.date.issued | 1994 | en_US |
dc.identifier.citation | Hypertension In Pregnancy, 1994, v. 13 n. 1, p. 51-60 | en_US |
dc.identifier.issn | 1064-1955 | en_US |
dc.identifier.uri | http://hdl.handle.net/10722/171145 | - |
dc.description.abstract | Objectives: To investigate the relaxant effect of MgSO4 and diphenylhydantoin on isolated canine middle cerebral artery (MCA) rings contracted with the thromboxane-A2 analogue U46619. Methods: Canine MCA rings, with and without endothelium, were suspended in organ chambers for isometric tension recording, they were contracted with U46619 in the presence of indomethacin, with and without nitro-L-arginine (NLA). Cumulative dose-response curves were performed using MgSO4 (10-8 M to 10-2 M) and diphenylhydantoin (10-9 M to 10-3 M). Main Outcome Measures: Tension at each concentration of the study drug expressed as a percentage of the maximum tension developed with U46619; area under the concentration response curve. Results: Both MgSO4 and diphenylhydantoin relaxed the MCA rings irrespective of the presence of endothelium. Diphenylhydantoin caused an endothelium-dependent relaxation at concentrations above 3x10-5 M, unaffected by NLA. Conclusions: MgSO4 relaxes canine MCA by a direct smooth muscle effect independent of the endothelium. Diphenylhydantoin causes an endothelium-dependent relaxation of canine MCA at concentrations above 3x10-5 M, unrelated to nitric oxide. MgSO4 and diphenylhydantoin may both help to prevent seizures in patients with eclampsia by reducing the potential for cerebral vasospasm. | en_US |
dc.language | eng | en_US |
dc.publisher | Informa Healthcare. The Journal's web site is located at http://www.tandf.co.uk/journals/titles/10641955.asp | en_US |
dc.relation.ispartof | Hypertension in Pregnancy | en_US |
dc.subject | Cerebral Vasospasm | en_US |
dc.subject | Diphenylhydantoin | en_US |
dc.subject | Magnesium Sulfate | en_US |
dc.title | Magnesium sulfate and diphenylhydantoin relax canine middle cerebral artery contracted with the thromboxane-A2 analogue U46619 by different mechanisms: Implications for the management of eclampsia | en_US |
dc.type | Article | en_US |
dc.identifier.email | Vanhoutte, PM:vanhoutt@hku.hk | en_US |
dc.identifier.authority | Vanhoutte, PM=rp00238 | en_US |
dc.description.nature | link_to_subscribed_fulltext | en_US |
dc.identifier.scopus | eid_2-s2.0-0028350849 | en_US |
dc.identifier.volume | 13 | en_US |
dc.identifier.issue | 1 | en_US |
dc.identifier.spage | 51 | en_US |
dc.identifier.epage | 60 | en_US |
dc.publisher.place | United States | en_US |
dc.identifier.scopusauthorid | Belfort, MA=7102893402 | en_US |
dc.identifier.scopusauthorid | Saade, GR=7006942866 | en_US |
dc.identifier.scopusauthorid | Moise Jr, KJ=7005901536 | en_US |
dc.identifier.scopusauthorid | Kirshon, B=7003767989 | en_US |
dc.identifier.scopusauthorid | Vanhoutte, PM=7202304247 | en_US |
dc.identifier.issnl | 1064-1955 | - |