Biomedical subjects

R Duprat

Publications and source records attributed to R Duprat.

18 recordsLinked to original sources

PubMed2005

Triplet superconducting pairing and density-wave instabilities in organic conductors.

Using a renormalization group approach, we determine the phase diagram of an extended quasi-one-dimensional electron gas model that includes interchain hopping, nesting deviations, and both intrachain and interchain repulsive interactions. We find a close proximity of spin-density- and charge-density-wave phases and singlet d-wave and triplet f-wave superconducting phases. There is a striking correspondence between our results and recent puzzling experimental findings in the Bechgaard salts, including the coexistence of spin-density-wave and charge-density-wave phases and the possibility of a triplet pairing in the superconducting phase.

Journal Article↗

PubMed1997

[Diagnostic accuracy of dobutamine-atropine stress echocardiography].

PURPOSE: To analyze the diagnostic accuracy of dobutamine-atropine stress echocardiography. METHODS: We studied 304 consecutive patients using dobutamine-atropine stress echocardiography who underwent coronary angiography within a month of the exam. Patients received high dobutamine doses associated or not with atropine. RESULTS: The global sensitivity was 92%, specificity was 72% and diagnostic accuracy was 87%. Analyzing 120 patients with normal LV function, we found sensitivity of 85%, specificity of 79% and accuracy of 82%. CONCLUSION: Dobutamine-atropine stress echocardiography is an accurate method for the detection of coronary artery disease.

Atropine↗

PubMed1997

[Safety and feasibility of dobutamine-atropine stress echocardiography].

PURPOSE: To study the safety and feasibility of dobutamine-atropine stress echocardiography (DASE) in patients with known or suspected coronary artery disease. METHODS: There were 3,000 DASE that were studied in a prospective fashion. All symptoms and side effects were stored in a data base format. RESULTS: Major test-related complications observed included one case of myocardial infarction, four cases of sustained ventricular tachycardia and five cases of atropine intoxication. There was no death or ventricular fibrillation as a direct or indirect consequence of the test. The infusion protocol allowed to us to examine patients using beta blockers, and led to 95% feasibility. CONCLUSION: DASE is a safe and feasible method for the study of patients with suspected or known coronary artery disease.

Adolescent↗

PubMed1997

[Prognostic value of stress echocardiography by dobutamine combined with atropine].

PURPOSE: To determine the prognostic value of dobutamine-atropine stress echocardiography (DASE). METHODS: We studied 452 consecutive patients at high risk for coronary artery disease, using DASE. They were followed during a mean period of 23 months. RESULTS: There were 9 cardiac deaths and 2 acute myocardial infarctions in the group of patients with positive tests, and there were 2 myocardial infarctions and 1 cardiac death in patients with negative DASE. CONCLUSION: We conclude that DASE reliably identifies patients at high risk for hard cardiac events.

Anti-Arrhythmia Agents↗

PubMed1987