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Biomedical subjects

J R Clem

Publications and source records attributed to J R Clem.

10 recordsLinked to original sources

Magnetic-flux penetration and critical currents in superconducting strips with slits.

We theoretically investigate transport-current-induced magnetic-flux penetration into superconducting strip lines with slits. Even when the individual strips have no bulk pinning, geometrical barriers prevent penetration of magnetic flux into the innermost strips while flux quasistatically penetrates into the outermost slits. The critical current of strip lines with 2N slits at zero applied magnetic field is found to be enhanced by a factor of (N+1)(1/2) above that of a single strip line without slits. Under suitable conditions, a domelike flux distribution due to the geometrical barrier can appear in the individual strips even in the absence of an applied magnetic field.

Journal Article↗

Pharmacotherapy of ischemic heart disease.

The pharmacotherapy of ischemic heart disease has evolved at a rapid pace during the past several decades. Drug therapy is prescribed for ischemic heart disease to either increase myocardial oxygen supply, decrease myocardial oxygen demand, or both. Although the types and number of drugs to treat ischemic heart disease are increasing and will continue to do so, there are still several major categories of pharmacologic agents that are essential in managing ischemic heart disease. The major drug categories covered are antiplatelet agents, anticoagulants, nitrates, beta-adrenergic receptor antagonists (beta-blockers), calcium channel antagonists, angiotensin-converting enzyme inhibitors, and thrombolytic agents. Current information and recommendations are presented for safe and effective use of these agents.

Cardiovascular Agents↗

Insect repellent (N,N-diethyl-m-toluamide) cardiovascular toxicity in an adult.

OBJECTIVE: To describe a case of N,N-diethyl-m-toluamide (DEET)-induced cardiovascular toxicity in an adult and reviews other cases that have been reported in the published literature. Human and animal data available on DEET pharmacokinetics are reviewed and factors that predispose an individual to DEET toxicity are identified. DATA SOURCES: Case report information was obtained through personal contact with the patient during hospitalization and by telephone, and also from the patient's medical records. Computerized literature searches were conducted with the following systems to obtain medical literature on DEET toxicity: TOXLINE, International Pharmaceutical Abstracts, and MEDLINE. Index Medicus was searched manually. STUDY SELECTION: All reported cases of DEET toxicity in children and adults were reviewed. DATA EXTRACTION: Case reports were evaluated for the quantity of the DEET exposure (topical or oral), the clinical manifestations of the exposure, and the outcome of the exposure. DATA SYNTHESIS: This case is similar in some aspects to those already in the literature; however, very few cases of DEET toxicity in adults have been reported. Cardiovascular toxicity in humans related to DEET application has not been previously reported in the published medical literature. DEET exposure (topical or oral) results in a highly variable clinical course. Whether the outcome is death or recovery without sequelae is difficult to predict. CONCLUSIONS: Adults, as well as children, are at risk for toxicity from insect repellents. The use of highly concentrated DEET-containing insect repellents should be avoided to reduce the risk of toxicity in both children and adults. The consequences of DEET toxicity are variable and unpredictable.

Administration, Cutaneous↗