Which property is NOT typical of polymorphic ventricular tachycardia?

Which property is NOT typical of polymorphic ventricular tachycardia?

• A. Gradual change in QRS shape and direction
• B. Presence of a regular rhythm
• C. Varied size and amplitude of QRS complexes
• D. Variable heart rate

Answer: (B)

The property that is not typical of polymorphic ventricular tachycardia is the presence of a regular rhythm. In polymorphic ventricular tachycardia, the QRS complexes demonstrate significant variability in shape, size, and amplitude, hence the term "polymorphic." This variability often correlates with changes in the heart rate, resulting in a rhythm that is generally irregular. A regular rhythm, characterized by consistent intervals between consecutive QRS complexes, is more commonly associated with other types of tachycardia, such as monomorphic ventricular tachycardia or atrial fibrillation. Overall, the irregularity of the rhythm is a key feature in distinguishing polymorphic ventricular tachycardia from other cardiac rhythms, thereby making the absence of a regular rhythm its defining characteristic.

The property that is not typical of polymorphic ventricular tachycardia is the presence of a regular rhythm. In polymorphic ventricular tachycardia, the QRS complexes demonstrate significant variability in shape, size, and amplitude, hence the term "polymorphic." This variability often correlates with changes in the heart rate, resulting in a rhythm that is generally irregular. A regular rhythm, characterized by consistent intervals between consecutive QRS complexes, is more commonly associated with other types of tachycardia, such as monomorphic ventricular tachycardia or atrial fibrillation.

Overall, the irregularity of the rhythm is a key feature in distinguishing polymorphic ventricular tachycardia from other cardiac rhythms, thereby making the absence of a regular rhythm its defining characteristic.