Additional content is available online at Elsevier eBooks for Practicing Clinicians Causes and Pathology Aortic regurgitation (AR) can result from primary disease of the aortic valve leaflets and/or dilation of the aortic root and ascending aorta ( Table 73.1 ).…
Additional content is available online at Elsevier eBooks for Practicing Clinicians Epidemiology In population-based echocardiographic studies, 1% to 2% of persons aged 65 or older and 12% of persons 75 or older had calcific aortic stenosis (AS) (see Chapter 90…
Additional content is available online at Elsevier eBooks for Practicing Clinicians Definition Syncope is a symptom that presents with abrupt, transient, complete loss of consciousness (LOC) associated with the inability to maintain postural tone, with rapid and spontaneous recovery. The…
Additional content is available online at Elsevier eBooks for Practicing Clinicians Perspective Sudden cardiac arrest (SCA), and its common consequence sudden cardiac death (SCD), is the common cardiac pathway for death. There are a diverse array of cardiac and noncardiac…
Additional content is available online at Elsevier eBooks for Practicing Clinicians Cardiac implantable electrical devices (CIEDs) refer to implanted devices that deliver therapeutic electrical stimuli and include permanent pacemakers and implantable cardioverter-defibrillators (ICDs). Types of Devices Electrical therapy for cardiac…
Additional content is available online at Elsevier eBooks for Practicing Clinicians Bradyarrhythmias Based on large population studies of healthy individuals, the lower limit of normal resting heart rate is defined as 50 beats , Frequently, bradyarrhythmias are physiologic, as in…
Additional content is available online at Elsevier eBooks for Practicing Clinicians Ventricular arrhythmias originate in the ventricular myocardium or His-Purkinje system. These include premature ventricular complexes (PVCs), nonsustained and sustained ventricular tachycardias (VT), and ventricular fibrillation (VF). They can occur…
Additional content is available online at Elsevier eBooks for Practicing Clinicians Electrocardiographic Features Atrial fibrillation (AF) is a supraventricular arrhythmia characterized electrocardiographically by low-amplitude baseline oscillations (fibrillatory or f waves from the fibrillating atria) and an irregularly irregular ventricular rhythm.…
Additional content is available online at Elsevier eBooks for Practicing Clinicians Definitions The 2015 American College of Cardiology/American Heart Association/Heart Rhythm Society (ACC/AHA/HRS) guidelines defined supraventricular tachycardia (SVT) as: An umbrella term used to describe tachycardias (atrial and/or ventricular rates…
Additional content is available online at Elsevier eBooks for Practicing Clinicians It is estimated that almost a third of people will have a problematic tachyarrhythmia, most often atrial fibrillation (AF), at some point during a normal life span. Thus, most…