TY - CHAP M1 - Book, Section TI - Focal Atrial Tachycardia A1 - Michaud, Gregory F. A1 - Stevenson, William G. A2 - Jameson, J. Larry A2 - Fauci, Anthony S. A2 - Kasper, Dennis L. A2 - Hauser, Stephen L. A2 - Longo, Dan L. A2 - Loscalzo, Joseph PY - 2018 T2 - Harrison's Principles of Internal Medicine, 20e AB - Focal atrial tachycardia (AT) can be due to abnormal automaticity, triggered automaticity, or a small reentry circuit confined to the atrium or atrial tissue extending into a pulmonary vein, the coronary sinus, or vena cava. It can be sustained, nonsustained, paroxysmal, or incessant. Focal AT accounts for ~10% of PSVTs in patients referred for catheter ablation. Nonsustained AT is commonly observed on 24-h ambulatory ECG recordings, and the prevalence increases with age. In fact, frequent atrial ectopy and nonsustained AT is often a precursor to more significant arrhythmias such as atrial fibrillation and flutter. Though unsustained, frequent atrial ectopy or short bursts of AT may be symptomatic and require therapy similar to that required for focal AT. SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/03/28 UR - accesspharmacy.mhmedical.com/content.aspx?aid=1162882831 ER -