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Biomedical subjects

J Milanes

Publications and source records attributed to J Milanes.

4 recordsLinked to original sources
PubMed1989

Cleanup of environmental sample extracts using Florisil solid-phase extraction cartridges.

Disposable cartridges containing 1 g of Florisil are investigated for cleanup of extracts obtained from various environmental matrices. Elution patterns and recoveries are determined for 22 chlorinated hydrocarbons and 16 phthalate esters in the presence of interferents such as corn oil, diesel hydrocarbons, organochlorine pesticides, and chlorinated phenols. Hexane, hexane/diethyl ether (1:1), hexane/acetone (9:1), and various combinations of hexane/methylene chloride are used as eluants.

Chromatography, Gas↗
PubMed1986

Exercise tests and ventricular tachycardia.

All treadmill exercise tests done at the Palo Alto Veterans Administration Medical Center from 1973 to 1982 were reviewed to identify episodes of ventricular tachycardia (>/=3 consecutive ventricular ectopic complexes) or ventricular fibrillation occurring during or within 8 minutes of cessation of symptom-limited exercise. Of patients with a clinical diagnosis of coronary artery disease (900 tests), ventricular tachycardia occurred in 36 (4.0%) and ventricular fibrillation in 6 (0.7%). Of patients without known coronary disease (1,700 tests), ventricular tachycardia occurred in 12 (0.07%), and no patient had ventricular fibrillation. Most arrhythmias ceased spontaneously and only 5 patients required cardioversion. We conclude that exercise tests are safe, the incidence of ventricular tachycardia or ventricular fibrillation is low-these arrhythmias occurring largely in patients with known coronary disease-spontaneous return to sinus rhythm is common and no deaths were associated with 2,400 consecutive tests.

Coronary Disease↗
PubMedDate not supplied

Single-laboratory evaluation of EPA method 8080 for determination of chlorinated pesticides and polychlorinated biphenyls in hazardous wastes.

Method 8080, as published in the Second Edition of "Test Methods for Evaluating Solid Waste," EPA Manual SW-846, has been evaluated in a single-laboratory study. The Florisil procedure recommended in Method 8080 for sample cleanup does not separate organochlorine pesticides (OCPs) from the polychlorinated biphenyls (PCBs). Consequently, gas chromatographic analysis of OCPs on the packed column recommended in the method may result in false identifications or in no identifications at all when PCBs are present. Therefore, silica gel was substituted for Florisil, a capillary column was substituted for the packed column, and a sulfur cleanup procedure was incorporated in the method. The revised method was evaluated with samples spiked at 3 concentrations. Precision and accuracy indicate that the revised method can be reliably applied to the determination of OCPs and PCBs in liquid and solid matrixes. Detection limits for liquid matrixes range from 0.02 to 0.09 micrograms/L for OCPs and from 0.5 to 0.9 micrograms/L for PCBs. Detection limits for solid matrixes range from 1 to 6 micrograms/kg for OCPs and from 60 to 70 micrograms/kg for PCBs.

Chromatography, Gas↗