Marvin W. Kronenberg

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OBJECTIVES This study sought to examine the effects of vasopressin V2 receptor antagonism with tolvaptan on the changes in left ventricular (LV) volumes over time. BACKGROUND Vasopressin levels may be increased in patients with heart failure (HF) and may be a factor driving the progression of HF. METHODS This was a multicenter, randomized, double-blind,(More)
CONTEXT Previous studies using autologous bone marrow mononuclear cells (BMCs) in patients with ischemic cardiomyopathy have demonstrated safety and suggested efficacy. OBJECTIVE To determine if administration of BMCs through transendocardial injections improves myocardial perfusion, reduces left ventricular end-systolic volume (LVESV), or enhances(More)
Background. Patients with heart failure and reduced left ventricular (LV) ejection fraction (EF) manifest progressive LV dilatation, which is prevented by angiotensin converting enzyme (ACE) inhibitors. In patients with asymptomatic LV systolic dysfunction, in whom there is less activation ofthe renin-angiotensin system, ventricular remodeling might be less(More)
OBJECTIVES We sought to determine the prognostic value of the admission electrocardiogram (ECG) in patients with unstable angina and non-Q wave myocardial infarction (MI). BACKGROUND Although the ECG is the most widely used test for evaluating patients with unstable angina and non-Q wave MI, little prospective information is available on its value in(More)
BACKGROUND Web-based home care monitoring systems can assess medication compliance, health status, quality of life, and physiologic parameters. They may help overcome some of the limitations associated with current congestive heart failure management models. OBJECTIVES This pilot study compared the effects of a self-care and medication compliance device,(More)
OBJECTIVE To study the potential usefulness of the 6-minute walk test, a self-paced submaximal exercise test, as a prognostic indicator in patients with left ventricular dysfunction. DESIGN Data were collected during a prospective cohort study, the Studies of Left Ventricular Dysfunction (SOLVD) Registry Substudy. SETTING Twenty tertiary care hospitals(More)
OBJECTIVE To investigate the natural history and response to treatment of patients with unstable angina or non-Q-wave myocardial infarction (MI). DESIGN Inception cohort. SETTING Patients in general community, primary care, or referral hospitals. PATIENTS All patients with an episode of unstable exertional chest pain or chest pain at rest presumed to(More)
BACKGROUND In patients with heart failure, activation of the renin-angiotensin system is common and has been postulated to provide a stimulus for further left ventricular (LV) structural and functional derangement. We tested the hypothesis that chronic administration of the angiotensin converting enzyme (ACE) inhibitor enalapril prevents or reverses LV(More)
Patients with heart failure and left ventricular systolic dysfunction exhibit increased adrenergic activity but blunted adrenergic responsiveness. We studied patients enrolled in the Studies of Left Ventricular Dysfunction, examining exercise responses of heart rate (HR) and plasma norepinephrine (PNE). Eighty-seven patients were studied before(More)
BACKGROUND The purpose of this study was to compare stress supine single photon emission computed tomography (SPECT) imaging with attenuation correction (AC) via computed tomography-based attenuation maps with stress prone SPECT imaging with regard to the rate of equivocal interpretation of rest/stress myocardial perfusion imaging. METHODS AND RESULTS(More)