Syndrome X and Endothelial Dysfunction

NCT00190086 | Terminated

• 1 other identifier: FEMH-94001
• Study Type: observational
• Target: 28
• Locations: 0 countries
• Sites: N/A

Brief Summary

Cardiac syndrome X is characterized by angina, positve stress test, and patent coronary angiography, and its probable mechanism is microvascular dysfunction associated with endothelial dysfunction. We used brachial artery flow-mediated vasodilation to assess the endothelial function of the patients with syndrome X, coronary artery disease, and controls. Methods: We enrolled 28 patients with syndrome X, 11 healthy volunteers and 11 coronary artery disease patients. All subjects underwent a 2-step brachial artery flow-related vasodilation test: ultrasound artery diameter was measured at rest and after occlusion to assess endothelium-dependent vasodilation and after sublingual nitroglycerin to determine endothelium-independent condition. Serum endothelin-1 assay was performed for all participants. Results: The cardiac syndrome X patients had lower brachial artery dilation ratio (diameter after test/ diameter before test) than controls (1.10 +/- 0.09 versus 1.27 +/- 0.11, p=0.013), but the ratio is still higher than CAD patients (1.10 +/- 0.09 versus 1.02 +/- 0.07, p\<0.001). After sublingual nitroglycerin, all 50 subjects had adequate vasodilation. Besides, normal controls have higher endothelin-1 level than the others. We concluded that syndrome X patients have worse endothelial function than healthy control, but patients of CAD had even worse endothelium function than cardiac syndrome X patients. Keywords: Cardiac syndrome X, coronary artery disease, endothelium-dependent vasodilation, endothelium-independent vasodilation, flow-mediated vasodilation, endothelin-1

Conditions

Syndrome X

Eligibility Criteria

• Age: 0 Years+
• Sex: all
• Healthy Volunteers: Yes
• Age Groups: Child (0-17), Adult (18-64), Older Adult (65+)

You may qualify if:

• which was performed under the impression of CAD due to positive treadmill electrocardiography test or ischemic evidence on Thallium scan, yielded the result of patent coronary tree. After the confirmation of angina symptoms and double-blinded review of the stress test and angiography result by 2 cardiologists to exclude controversial result

Sponsors & Collaborators

• Far Eastern Memorial Hospital: lead

MeSH Terms

Conditions

Microvascular Angina

Condition Hierarchy (Ancestors)

Angina Pectoris; Myocardial Ischemia; Heart Diseases; Cardiovascular Diseases; Vascular Diseases

Study Officials

• A H Li, MD

  Far Eastern Memorial Hospital

  PRINCIPAL INVESTIGATOR

Study Design

• Study Type: observational
• Observational Model: DEFINED POPULATION
• Time Perspective: OTHER
• Sponsor Type: OTHER

Study Record Dates

• First Submitted: September 11, 2005
• First Posted: September 19, 2005
• Study Start: January 1, 2001
• Study Completion: December 1, 2001
• Last Updated: September 19, 2005

Record last verified: 2001-12