Atrial depolarization is regular at a rate of 260 to 340 beats per minute. With a normal atrioventricular (AV) node there is usually a physiologic second-degree block with resultant 2 : 1 conduction. Higher degrees of AV block can occur in patients with AV nodal disease, increased vagal ...
21-5). Postoperative atrial flutter typically has 2:1 conduction. If antiarrhythmic drugs have been given as part of routine prophylaxis, the ventricular rate with 2:1 block may be less (125 to 150 beats per minute). Atrial flutter with 2:1 AV block can be difficult to distinguish from ...
Atrial flutter occurs when a “reentrant” circuit is present, causing a repeated loop of electrical activity to depolarize the atrium at a rate of about 250 to 350 beats per minute; the atrial rate in atrial fibrillation is 400 to 600 bpm. ...
Atrial flutter (rapid atrial beat) may occur suddenly and unpredictably or may be a chronic sustained arrhythmia. The heart rate in atrial flutter approximates 300 beats per minute and is difficult to treat pharmacologically. In general, only a fraction of the atrial beats (one-third to…Read ...
AF occurs when irritable foci cause rapid action potentials that result in an atrial heart rate between 400 and 600 beats per minute (bpm). These foci are commonly in the superior pulmonary veins; this is an important factor in the electrophysiologic approach to atrial fibrillation, known as pu...
Atrial rates are generally between 240 and 360 beats per minute (bpm) without medications. The electrocardiogram (ECG) usually demonstrates a regular rhythm, with P waves that can appear sawtoothed (see the image below), also called flutter waves, usually best visible in lead II. The QRS ...
Atrial flutter is an arrhythmia that results from an abnormal electrical circuit inside one of your heart’s two upper chambers, or atria. Most often, this faulty signal develops in the right atrium. It causes both of your atria to beat extra fast, about 250-350 beats per minute. That, ...
and often has a ventricular rate in the range of 120 to 180 beats per minute.13The baseline on the ECG strip often is undulating and occasionally has coarse irregular activity (Figure 3). This activity may resemble atrial flutter, but it is not as uniform wave to wave as atrial flutter....
Key difference: Flutter is a regular rhythm whereas fibrillation is irregular. Paroxysmal supraventricular tachycardia : a type of supraventricular tachycardia characterized by narrow QRS complexes and a fast heart rhythm, typically between 150 and 240 beats per minute Multifocal atrial tachycardia : a ...
In the vast majority of patients with permanent atrial fibrillation, slowing of the ventricular response to 70–90 beats per minute will be helpful. A beta-blocking drug such as metoprolol, bisoprolol, or atenolol should slow down the ventricular response. These agents are also a good...