Which of the following best describes a ventricular tachycardia?
An irregularly irregular rhythm with narrow QRS complexes
A regular rhythm with a rate of 60-100 beats per minute and normal P waves
A rapid, regular rhythm originating from the atria with narrow QRS complexes
A rapid, regular rhythm originating from the ventricles with wide QRS complexes
Ventricular tachycardia is characterized by a rapid heart rate originating from the ventricles, typically with a rate of 100-250 beats per minute. It's important to differentiate this from supraventricular tachycardias, which originate above the ventricles. The wide QRS complexes (>0.12 seconds) are a key feature of ventricular tachycardia, distinguishing it from most supraventricular rhythms. Atrial fibrillation, while also a tachyarrhythmia, typically has an irregularly irregular rhythm and narrow QRS complexes unless there's aberrant conduction. Sinus tachycardia is a regular rhythm originating from the sinoatrial node with a rate over 100 bpm but less than 150 bpm in adults, and it maintains normal P waves and narrow QRS complexes.
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