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Author(s): Suketu H Nanavati , Robert J Bulgarelli , Jose Vazquez-Tanus , et al Added: 3 years ago
Heart rate variability (HRV) is considered to be a means of assessing autonomic function. However, HRV alone provides mixed measures of autonomic function1–11 and, as a result, cannot provide much insight into the autonomic involvement in arrhythmia.1,6,10 When HRV analysis is employed in conjunction with respiratory activity (RA) analysis, it has been shown to independently, simultaneously, and… View more

Imaging & Diagnostics

Electrophysiology & Arrhythmia
Author(s): Philip Adamson Added: 3 years ago
A growing appreciation of the prevalence of sleep breathing disorders, especially as comorbidities of disease syndromes such as chronic heart failure, has increased interest in screening, diagnosis, and treatment of obstructive and central sleep apnea. Sleep apnea diagnosis currently requires an overnight polysomnograhic evaluation in which the disease is defined as the number of times per hour… View more

Heart Failure

Electrophysiology & Arrhythmia
Author(s): Maria Teresa La Rovere , Roberto Maestri , Gian Domenico Pinna Added: 3 years ago
Arterial baroreceptors play a crucial role in the adjustment of the cardiovascular system to several surrounding conditions. In a simplified paradigm, baroreceptor stimulation results in arterial pressure changes that can modulate both sympathetic and vagal activity and, as a consequence, heart rate and myocardial electrophysiological properties, contractility and vascular resistance. Arterial… View more

Heart Failure
Author(s): JM Prutkin , MA Chen , RW Rho , et al Added: 3 years ago
Numerous clinical trials involving patients with severe, symptomatic heart failure and a wide QRS complex have shown benefits from cardiac resynchronization therapy (CRT). CRT can increase left ventricular ejection fraction (LVEF), decrease LV volume and mitral regurgitation, improve symptoms caused by heart failure,1-3 and may also improve mortality.4,5 Current American College of Cardiology/… View more

Imaging & Diagnostics
Author(s): JM Prutkin , MA Chen , RW Rho , et al Added: 3 years ago
Numerous clinical trials involving patients with severe, symptomatic heart failure and a wide QRS complex have shown benefits from cardiac resynchronization therapy (CRT). CRT can increase left ventricular ejection fraction (LVEF), decrease LV volume and mitral regurgitation, improve symptoms caused by heart failure,1-3 and may also improve mortality.4,5 Current American College of Cardiology/… View more

Imaging & Diagnostics

Electrophysiology & Arrhythmia
Portrait image of Brian Olshansky
Job title: Emeritus Professor of Medicine
Brian Olshansky, MD, FACC, FAHA, FHRS, FESC is an Emeritus Professor of Medicine at the University of Iowa Carver College of Medicine and an internationally known electrophysiologist. At University of Iowa Hospitals & Clinics, he directed the Clinical Cardiac Electrophysiology Fellowship Training Program for six years. Before that, he directed the Electrophysiology Training Program at Loyola… View more
Author(s): Derek V Exner Added: 3 years ago
Why Do We Need Risk Stratification Tools? Sudden death accounts for between 300,000 and 500,000 deaths each year in North America.1 Patients with a history of myocardial infarction (MI) have a four-fold higher risk of sudden death than those without such a history. Most sudden deaths in ambulatory populations result from life-threatening ventricular arrhythmias that lead to a cardiac arrest.2… View more

Standards & Guidelines

Imaging & Diagnostics
Author(s): Deborah A Chyun Added: 3 years ago
Individuals with both type 1 and type 2 diabetes mellitus (DM) are known to be at high risk for developing coronary artery disease (CAD). The risk is two to three times greater in those with DM compared with those without, and is especially high in women with DM. An additional problem in individuals with DM is that, even with severe underlying CAD, many individuals may have atypical symptoms or… View more

Prevention & Chronic Conditions

MI/ACS
Author(s): Randal J Thomas Added: 3 years ago
The need for a patient to consult a cardiologist can be exemplified by the case a 65-year-old man who recently suffered an anterior wall myocardial infarction (MI) and who has been participating in cardiac rehabilitation, who presents with feelings of overwhelming depression and hopelessness. On three occasions since his hospitalization he has been evaluated in the local emergency department (ED)… View more

Prevention & Chronic Conditions
Author(s): Randal J Thomas Added: 3 years ago
The need for a patient to consult a cardiologist can be exemplified by the case a 65-year-old man who recently suffered an anterior wall myocardial infarction (MI) and who has been participating in cardiac rehabilitation, who presents with feelings of overwhelming depression and hopelessness. On three occasions since his hospitalization he has been evaluated in the local emergency department (ED)… View more

Prevention & Chronic Conditions