Torsades rythm strip
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For each cardiac rhythm category we provide one or more ECG tracings. A synopsis of the cardiac rhythm dysrhythmia is provided and electronic calipers can be used to study each tracing. A basic EKG course is available using the link below. Essential ECG features are explained along with step-by-step analysis techniques. This includes rhythm evaluation, determining heart rate and assessing multiple components of the EKG waveform.
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Twelve-Lead Electrocardiogram of Torsades de Pointes
ECG Basics: Torsades de Pointes | ECG Guru - Instructor Resources
Ventricular tachycardia refers to a wide QRS complex heart rhythm — that is, a QRS duration beyond milliseconds — originating in the ventricles at a rate of greater than beats per minute. This can be hemodynamically unstable, causing severe hypotension, and can thus be life-threatening. Ventricular fibrillation, asystole and sudden cardiac death can occur soon after ventricular tachycardia if action is not taken immediately. Ventricular tachycardia can occur with many variations of the QRS morphology, depending on where the arrhythmia originates, which sometimes makes diagnosis on ECG challenging.
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Ventricular Tachycardia (VT) ECG Review
Torsade de Pointes is typically initiated by a short-long-short interval. A ventricle extrasystole first beat: short is followed by a compensatory pause. The following beat second beat: long has a longer QT interval. If the next beat follows shortly thereafter, ther is a good chance that this third beat falls within the QT interval, resulting in the R on T phenomenon and subsequent Torsades de Pointes. During Torsades de Pointes the ventricles depolarize in a circular fashion resulting in QRS complexes with a continuously turning heart axis around the baseline hence the name Torsade de Pointes.
Torsades de pointes is a specific type of polymorphic ventricular tachycardia that occurs within the context of an underlying prolonged QTc interval. Due to the brevity of the arrhythmia or, in the event of a longer episode, to the gravely deteriorating condition of the patient, it is very rare to record a lead electrocardiogram ECG of torsades de pointes. Therefore, most electrocardiographic appearances of torsades de pointes have been limited to the recordings of rhythm strips.
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