Robert F Percy

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We compared short-term heart rate variability (HRV) in 60 patients with end-stage renal disease (ESRD) with 33 age-matched healthy controls and also assessed the contribution of known determinants of HRV in the ESRD patients. HRV was markedly decreased in the ESRD patients and the predictor variables of cardiac diseases, diabetes mellitus, age, heart rate,(More)
Fourteen normal subjects and 10 marathon runners were studied using postexercise echocardiography to assess left ventricular (LV) wall thickness, afterload and systolic performance. Cuff systolic blood pressures and M-mode echocardiographic recordings were obtained in the supine position before and within 2 minutes of termination of maximal treadmill(More)
OBJECTIVE ST-elevation myocardial infarction (STEMI) identification by emergency medicine services (EMS) leading to pre-hospital catheterization laboratory (CL) activation shortens ischemic time and improves outcomes. We examined the incremental value of addition of a screening clinical tool (CT), containing clinical information and a Zoll electrocardiogram(More)
Echocardiography is helpful in the identification of extracardiac masses. The role of echocardiography in evaluating the effects of the masses on the heart is not well established. The case presented details the identification of and the evaluation by echocardiography of structural and functional effects of a massively dilated esophagus on the heart.(More)
Sensitive indexes for detection of left ventricular (LV) systolic performance are necessary for optimal clinical management of asymptomatic patients with aortic regurgitation (AR). To investigate the prognostic value of noninvasively determined baseline LV wall stress, we studied 10 asymptomatic patients with AR who had normal LV systolic function on(More)
To assess whether the calcium antagonist nifedipine has a specific, direct effect on left ventricular diastolic function separate from its vasodilatory action, we studied 10 patients with idiopathic congestive cardiomyopathy (ages 28-69, New York Heart Association Class III or IV) at 30 min, 2 h, and 6 h after administration of 10 mg of sublingual(More)
The purpose of this study is to evaluate the accuracy of semiautomated analysis of contrast enhanced magnetic resonance angiography (MRA) in patients who have undergone standard angiographic evaluation for peripheral vascular disease (PVD). Magnetic resonance angiography is an important tool for evaluating PVD. Although this technique is both safe and(More)
This report describes a single site experience as part of a multicenter clinical trial with high-speed rotational atherectomy in human coronary arteries. A total of 108 patients with 143 lesions had interventions, were grouped by success or failure, and were analyzed by patient, lesion, and procedural variables. Satisfactory results were achieved in 131 of(More)