Paroxysmal Supraventricular Tachycardia (PSVT) is typically associated with which QRS width?

Paroxysmal Supraventricular Tachycardia (PSVT) is typically associated with which QRS width?

• A. Narrow QRS complexes
• B. Wide QRS complexes with delta waves
• C. Absent QRS complexes
• D. Irregular QRS complexes

Answer: (A)

PSVT is a tachycardia that arises above the ventricles, so the impulse travels through the normal His-Purkinje system to activate the ventricles. This coordinated ventricular activation yields narrow QRS complexes, typically less than 120 ms. If a tachycardia shows wide QRS complexes, it suggests either a ventricular origin or supraventricular tachycardia with aberrant conduction or pre-excitation (such as WPW), rather than a classic PSVT. Therefore, the best answer is narrow QRS complexes.

PSVT is a tachycardia that arises above the ventricles, so the impulse travels through the normal His-Purkinje system to activate the ventricles. This coordinated ventricular activation yields narrow QRS complexes, typically less than 120 ms. If a tachycardia shows wide QRS complexes, it suggests either a ventricular origin or supraventricular tachycardia with aberrant conduction or pre-excitation (such as WPW), rather than a classic PSVT. Therefore, the best answer is narrow QRS complexes.