Ronald L Menlove

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We used radioligand binding techniques and measurement of beta-agonist-mediated positive inotropic responses in isolated cardiac tissue to examine beta-adrenergic-receptor subpopulations in nonfailing and failing human left and right ventricular myocardium. In tissue derived from 48 human hearts the receptor subtypes identified in nonfailing ventricle by(More)
BACKGROUND Randomized, controlled trials have shown that prophylactic antibiotics are effective in preventing surgical-wound infections. However, it is uncertain how the timing of antibiotic administration affects the risk of surgical-wound infection in actual clinical practice. METHODS We prospectively monitored the timing of antibiotic prophylaxis and(More)
BACKGROUND Coronary patency has been used as a measure of thrombolysis success after acute myocardial infarction. The Thrombolysis in Myocardial Infarction (TIMI) Study Group perfusion grades have gained wide acceptance, with grades 0 (no distal flow) and 1 perfusion (minimal flow) being designated as thrombolysis failures and grades 2 (partial perfusion)(More)
We prospectively studied 551 sequential endomyocardial biopsies from 36 consecutive cardiac allografts. With the use of a combination of light microscopy (including careful evaluation of vascular changes) and immunofluorescence to detect the deposition of immunoglobulin and complement, we identified three patterns of allograft rejection, designated as(More)
An interferon-gamma, tumor necrosis factor, and interleukin-1-inducible, high-output pathway synthesizing nitric oxide (NO) from L-arginine was recently identified in rodents. High-dose interleukin-2 (IL-2) therapy is known to induce the same cytokines in patients with advanced cancer. Therefore, we examined renal cell carcinoma (RCC; n = 5) and malignant(More)
The efficacy of using the Kinetic Treatment Table (KTT) to prevent or reduce pulmonary complications in severely head-injured patients is unclear. This study is a prospective, randomized trial using the KTT vs. conventional bed care in severely head-injured patients. Outcome measures were hospital length of stay (LOS), mortality, CNS morbidity at hospital(More)
Depression of myocardial conduction velocity can be an important mechanism of action of antiarrhythmic drugs but it can also facilitate arrhythmogenesis. We used lidocaine in an anesthetized canine preparation to address the hypothesis that drug-induced rate-dependent conduction velocity depression causes ventricular tachyarrhythmias. A closely spaced(More)
Beta-blockade therapy to improve survival in idiopathic dilated cardiomyopathy (IDC) has been both advocated and criticized. However, randomized studies have not been performed. Thus, 50 patients with IDC were randomized in pairs to standard therapy (C) alone or with beta blockade (BB). Beta-blockade therapy with metoprolol was titrated from 12.5 to 50 mg(More)
Milrinone is a promising new inotrope, but its arrhythmogenic potential has not been defined. We monitored ventricular arrhythmias during a 24-hour baseline and 48-hour milrinone infusion period in 12 patients with chronic heart failure. Patients were characterized by a mean age of 58 years and a left ventricular ejection fraction of 21%. Nine (75%) were(More)
BACKGROUND We investigated the effects of bucindolol, a nonselective, non-ISA beta-blocker with mild-vasodilatory properties, in patients with congestive heart failure from ischemic dilated cardiomyopathy (ISCDC, n = 27) and compared the results with those in subjects with heart failure from idiopathic dilated cardiomyopathy (IDC, n = 22). METHODS AND(More)