New-onset atrial fibrillation

New-onset atrial fibrillation (AF) is a new or first detectable episode of a chaotic and irregular atrial arrhythmia. Prevalence increases progressively with age.

Causes significant morbidity and mortality including palpitations, dyspnea, angina, dizziness or syncope, and features of congestive heart failure, tachycardia-induced cardiomyopathy, stroke, and death.

ECG shows absent P waves, presence of fibrillatory waves, and irregularly irregular QRS complexes.

Most patients presenting with new-onset or “acute” atrial fibrillation (AF) do not require immediate cardioversion. Most patients will require medical therapy to control ventricular rate.

Patients who develop hemodynamic compromise should have immediate direct current cardioversion.

If the precise timing of the onset of AF is unclear, a transesophageal echocardiogram must be performed to exclude left atrial clots before cardioversion.

Atrial fibrillation (AF) is a supraventricular tachyarrhythmia. It is characterized by uncoordinated atrial activity on the surface ECG, with fibrillatory waves of varying shapes, amplitudes, and timing associated with an irregularly irregular ventricular response when atrioventricular conduction is intact.[1]January CT, Wann LS, Alpert JS, et al. 2014 AHA/ACC/HRS guideline for the management of patients with atrial fibrillation: a report of the American College of Cardiology/American Heart Association Task Force on Practice Guidelines and the Heart Rhythm Society. J Am Coll Cardiol. 2014 Dec 2;64(21):e1-76. http://content.onlinejacc.org/article.aspx?articleid=1854231 http://www.ncbi.nlm.nih.gov/pubmed/24685669?tool=bestpractice.com New-onset AF is defined as a new onset or a first detectable episode of AF, whether symptomatic or not.

This topic will concentrate on new-onset AF in the nonvalvular and nonsurgical settings.