Atrial Flutter: Difference between revisions

From ECGpedia
Jump to navigation Jump to search
mNo edit summary
mNo edit summary
Line 1: Line 1:
{{Category|Supraventricular Rhythms}}
{{Arrhythmias|
{{Arrhythmias|
| name = Atrial flutter
| name = Atrial flutter
Line 13: Line 14:
During atrial flutter the atria depolarize in an organized circular movement. This is caused by [[Arrhythmias#Re-entry|re-entry]]. The atria contract typically at around 300 bpm, which results in a fast sequence of p-waves in a sawtooth pattern on the ECG. For most AV-nodes this is way to fast to be able to conduct the signal to the ventricles, so typically there is a 2:1, 3:1 or 4:1 block, resulting in a ventricular frequency of 150, 100 or 75 bpm respectively. Often the grade of block changes every couple of beats, resulting in e.g. 2:1, or 3:1 blocks and a somewhat irregular ventricular heart rate. The saw-tooth is especially prominent in lead II, this lead normally shows constant electrical activity: it is never horizontal. Causes and risk of atrial flutter are comparable to atrial fibrillation.
During atrial flutter the atria depolarize in an organized circular movement. This is caused by [[Arrhythmias#Re-entry|re-entry]]. The atria contract typically at around 300 bpm, which results in a fast sequence of p-waves in a sawtooth pattern on the ECG. For most AV-nodes this is way to fast to be able to conduct the signal to the ventricles, so typically there is a 2:1, 3:1 or 4:1 block, resulting in a ventricular frequency of 150, 100 or 75 bpm respectively. Often the grade of block changes every couple of beats, resulting in e.g. 2:1, or 3:1 blocks and a somewhat irregular ventricular heart rate. The saw-tooth is especially prominent in lead II, this lead normally shows constant electrical activity: it is never horizontal. Causes and risk of atrial flutter are comparable to atrial fibrillation.
{{clr}}
{{clr}}
[[Category:Supraventricular Rhythms]]

Revision as of 20:02, 22 July 2007

Template:Category

Atrial flutter
{{{locatieafbeelding}}}
Atrial rate 250-350 bpm
Ventricular rate 75-150bpm (3:1 of 2:1 block)
Regularity regular (sometimes changing block)
Origin atrial (SVT)
P-wave negative sawtooth in lead II
Effect of adenosine temporary reduced AV conduction (eg 4:1)
Example ECG: The arrows mark the flutter waves. This is an example of an alternating 2:1 and 3:1 block. Atrial flutter
Example ECG2: Atrial flutter with 2:1 conduction. Atrial flutter

During atrial flutter the atria depolarize in an organized circular movement. This is caused by re-entry. The atria contract typically at around 300 bpm, which results in a fast sequence of p-waves in a sawtooth pattern on the ECG. For most AV-nodes this is way to fast to be able to conduct the signal to the ventricles, so typically there is a 2:1, 3:1 or 4:1 block, resulting in a ventricular frequency of 150, 100 or 75 bpm respectively. Often the grade of block changes every couple of beats, resulting in e.g. 2:1, or 3:1 blocks and a somewhat irregular ventricular heart rate. The saw-tooth is especially prominent in lead II, this lead normally shows constant electrical activity: it is never horizontal. Causes and risk of atrial flutter are comparable to atrial fibrillation.