Nctid:
NCT00001461
Payload:
{"hasResults"=>false, "derivedSection"=>{"miscInfoModule"=>{"versionHolder"=>"2024-12-20"}, "conditionBrowseModule"=>{"meshes"=>[{"id"=>"D050197", "term"=>"Atherosclerosis"}, {"id"=>"D003327", "term"=>"Coronary Disease"}], "ancestors"=>[{"id"=>"D001161", "term"=>"Arteriosclerosis"}, {"id"=>"D001157", "term"=>"Arterial Occlusive Diseases"}, {"id"=>"D014652", "term"=>"Vascular Diseases"}, {"id"=>"D002318", "term"=>"Cardiovascular Diseases"}, {"id"=>"D017202", "term"=>"Myocardial Ischemia"}, {"id"=>"D006331", "term"=>"Heart Diseases"}], "browseLeaves"=>[{"id"=>"M6549", "name"=>"Coronary Disease", "asFound"=>"Coronary Disease", "relevance"=>"HIGH"}, {"id"=>"M6546", "name"=>"Coronary Artery Disease", "relevance"=>"LOW"}, {"id"=>"M19506", "name"=>"Myocardial Ischemia", "relevance"=>"LOW"}, {"id"=>"M26188", "name"=>"Atherosclerosis", "asFound"=>"Atherosclerosis", "relevance"=>"HIGH"}, {"id"=>"M4469", "name"=>"Arteriosclerosis", "relevance"=>"LOW"}, {"id"=>"M4465", "name"=>"Arterial Occlusive Diseases", "relevance"=>"LOW"}, {"id"=>"M17400", "name"=>"Vascular Diseases", "relevance"=>"LOW"}, {"id"=>"M10543", "name"=>"Ischemia", "relevance"=>"LOW"}, {"id"=>"M9419", "name"=>"Heart Diseases", "relevance"=>"LOW"}], "browseBranches"=>[{"name"=>"Heart and Blood Diseases", "abbrev"=>"BC14"}, {"name"=>"All Conditions", "abbrev"=>"All"}, {"name"=>"Symptoms and General Pathology", "abbrev"=>"BC23"}]}, "interventionBrowseModule"=>{"browseLeaves"=>[{"id"=>"M12507", "name"=>"Nitric Oxide", "relevance"=>"LOW"}, {"id"=>"M7951", "name"=>"Enzyme Inhibitors", "relevance"=>"LOW"}, {"id"=>"M4134", "name"=>"Angiotensin-Converting Enzyme Inhibitors", "relevance"=>"LOW"}, {"id"=>"M5197", "name"=>"Bradykinin", "relevance"=>"LOW"}, {"id"=>"M10725", "name"=>"Kininogens", "relevance"=>"LOW"}], "browseBranches"=>[{"name"=>"Vasodilator Agents", "abbrev"=>"VaDiAg"}, {"name"=>"Respiratory System Agents", "abbrev"=>"Resp"}, {"name"=>"All Drugs and Chemicals", "abbrev"=>"All"}]}}, "protocolSection"=>{"designModule"=>{"studyType"=>"OBSERVATIONAL", "enrollmentInfo"=>{"count"=>209}}, "statusModule"=>{"overallStatus"=>"COMPLETED", "startDateStruct"=>{"date"=>"1995-03"}, "expandedAccessInfo"=>{"hasExpandedAccess"=>false}, "statusVerifiedDate"=>"2000-04", "completionDateStruct"=>{"date"=>"2001-04"}, "lastUpdateSubmitDate"=>"2008-03-03", "studyFirstSubmitDate"=>"1999-11-03", "studyFirstSubmitQcDate"=>"2002-12-09", "lastUpdatePostDateStruct"=>{"date"=>"2008-03-04", "type"=>"ESTIMATED"}, "studyFirstPostDateStruct"=>{"date"=>"2002-12-10", "type"=>"ESTIMATED"}}, "conditionsModule"=>{"keywords"=>["Angiotensin Converting Enzyme", "Angiotensin Converting Enzyme Inhibitors", "Bradykinin", "Endothelial Function", "Nitric Oxide", "Coronary Artery Disease"], "conditions"=>["Atherosclerosis", "Coronary Disease"]}, "referencesModule"=>{"references"=>[{"pmid"=>"8491001", "type"=>"BACKGROUND", "citation"=>"Panza JA, Casino PR, Kilcoyne CM, Quyyumi AA. Role of endothelium-derived nitric oxide in the abnormal endothelium-dependent vascular relaxation of patients with essential hypertension. Circulation. 1993 May;87(5):1468-74. doi: 10.1161/01.cir.87.5.1468."}]}, "descriptionModule"=>{"briefSummary"=>"The walls of blood vessels are lined by flat cells that are responsible for releasing substance(s) that control the activity of the blood vessel. These cells are referred to as the endothelium of the blood vessel. One of the substances released from the endothelium is called nitric oxide (NO). This substance functions to keep blood vessels relaxed and to prevent blood from clotting inside the vessels.\n\nStudies done by researchers in the Cardiology Branch of the National Heart, Lung and Blood Institute have shown that nitric oxide activity may be lower in patients with hardening of the arteries (atherosclerosis) and risk factors for atherosclerosis.\n\nAnother substance released by the cells of the endothelium is called bradykinin. It functions to stimulate the production of nitric oxide. Therefore bradykinin is also responsible for the relaxation and widening of blood vessels.\n\nAn enzyme found in the blood called angiotensin-converting enzyme (ACE) inactivates baradykinin and thereby decreases the production of nitric oxide. The activity of ACE is determined by genetics and is different in each person. Medications that block ACE (ACE-inhibitors) may be useful for patients with high levels of ACE activity.\n\nThis study is designed to determine;\n\n1. The role of bradkinin in stimulating the production of nitric oxide\n2. Whether ACE-inhibitors improve blood vessel relaxation caused by bradykinin\n3. Whether ACE-inhibitors improve abnormal blood vessel relaxation\n4. Whether ACE-inhibitors and bradykinin affect blood clotting\n5. Whether blood vessel response to ACE-inhibitor and bradykinin depends on the patients genetic make-up", "detailedDescription"=>"The vascular endothelium tonically releases nitric oxide that produces smooth muscle relaxation, inhibition of platelet aggregation, and inhibition of cellular proliferation. Studies in the Cardiology Branch have demonstrated that nitric oxide activity is reduced in the coronary and peripheral vasculature of patients with atherosclerosis and in those with risk factors for atherosclerosis. Bradykinin, an endothelium-dependent vasodilator, may be an important modulator of vascular tone in vivo because it is tonically produced by the endothelium. Bradykinin is inactivated by angiotensin converting enzyme (ACE) that is found on the endothelial cell surface. The activity of plasma ACE is variable among individuals and is at least partly genetically determined. ACE activity may modulate the local vascular effects of bradykinin, and thus, ACE inhibitors would be expected to improve endothelium-dependent responses in patients with higher tissue ACE activity.\n\nThis protocol is designed to determine 1) the role of bradykinin in stimulating nitric oxide release in the human coronary and peripheral vasculature; 2) whether ACE inhibitors improve bradykinin-induced vasodilation, and if so, whether this occurs as a result of endothelium-dependent release of nitric oxide; 3) whether ACE inhibitors improve the abnormal shear-induced coronary vasodilation in patients with normal coronary arteries and those with coronary artery disease; 4) whether ACE inhibitors and bradykinin affect platelet function; 5) whether the vascular responses to ACE inhibition and bradykinin depend on the ACE genotype."}, "eligibilityModule"=>{"sex"=>"ALL", "stdAges"=>["CHILD", "ADULT", "OLDER_ADULT"], "healthyVolunteers"=>false, "eligibilityCriteria"=>"Anyone with chest pain with known or suspected coronary artery disease."}, "identificationModule"=>{"nctId"=>"NCT00001461", "briefTitle"=>"Study of the Interaction Between the Cells Lining Blood Vessels and Angiotensin-Converting Enzyme", "organization"=>{"class"=>"NIH", "fullName"=>"National Institutes of Health Clinical Center (CC)"}, "officialTitle"=>"Investigation of the Interaction Between the Vascular Endothelium and Angiotensin-Converting Enzyme", "orgStudyIdInfo"=>{"id"=>"950099"}, "secondaryIdInfos"=>[{"id"=>"95-H-0099"}]}, "contactsLocationsModule"=>{"locations"=>[{"zip"=>"20892", "city"=>"Bethesda", "state"=>"Maryland", "country"=>"United States", "facility"=>"National Heart, Lung and Blood Institute (NHLBI)", "geoPoint"=>{"lat"=>38.98067, "lon"=>-77.10026}}]}, "sponsorCollaboratorsModule"=>{"leadSponsor"=>{"name"=>"National Heart, Lung, and Blood Institute (NHLBI)", "class"=>"NIH"}}}}
