Atrial Fibrillation Atrial Flutter Ischemia 
Dr. Smith's ECG Blog
NOVEMBER 26, 2018
The rhythm differential for narrow, regular, and tachycardic is sinus rhythm, SVT (encompassing AVNRT, AVRT, atrial tach, etc), and atrial flutter (another supraventricular rhythm which is usually considered separately from SVTs). Therefore this patient is either in some form of SVT or atrial flutter.
Dr. Smith's ECG Blog
MAY 1, 2023
edits by Meyers A woman in her 60s with a history of chronic atrial fibrillation on Eliquis, ESRD on hemodialysis, type-II diabetes mellitus, prior CVA, hypertension, and hyperlipidemia presented to the emergency department with multiple complaints after missing dialysis. They are flutter waves, and the rhythm is 2:1 atrial flutter.
Dr. Smith's ECG Blog
JANUARY 9, 2024
She also has a hx of paroxysmal atrial fibrillation and is on oral anticoagulant treatment. The ECG was interpreted as showing atrial flutter with 2:1 conduction. Are you confident there is no ischemia? The heart rate could be compatible with that of a 2:1 conducted atrial flutter.
Dr. Smith's ECG Blog
AUGUST 3, 2018
Re-entrant tachycardias (atrial flutter, PSVT, AVRT, VT) have constant regular heart rates, whereas sinus tachycardia will usually gradually change rate with differing conditions (for instance, after infusion of fluid and BP increase, sinus tach rate might decrease from 130 to 125, for instance). So there is a re-entrant rhythm.
Dr. Smith's ECG Blog
OCTOBER 25, 2022
We see a regular tachycardia with a narrow QRS complex and no evidence of OMI or subendocardial ischemia. The differential of a regular narrow QRS tachycardia is sinus tachycardia, SVT, and atrial flutter with regular conduction. There are no P waves preceding the QRS complexes, and no clear flutter waves.
Dr. Smith's ECG Blog
MARCH 6, 2020
There is a large peaked P-wave in lead II (right atrial enlargement) There is left axis deviation consistent with left anterior fascicular block. There is no evidence of infarction or ischemia. There is atrial activity before every QRS, but that activity has negative polarity, so it is not sinus rhythm.
Dr. Smith's ECG Blog
APRIL 8, 2015
Evidence of acute ischemia (may be subtle) vii. Rhythm abnormalities (atrial fibrillation or flutter, supraventricular tachycardia, multifocal atrial tachycardia, frequent or repetitive premature supraventricular or ventricular complexes, sustained or non-sustained ventricular tachycardia, paced rhythms), 2.
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