1. Q: When assessing a patient with WCT, which of the following is the most important initial step? A. Administering antiarrhythmic medication B. Identifying the presence of AV dissociation C. Checking for structural heart disease D. Obtaining a 12-lead ECG Answer: D. Obtaining a 12-lead ECG Rationale: The 12-lead ECG is crucial for diagnosing WCT as it helps in identifying the rhythm, determining the origin of the tachycardia, and guiding subsequent management steps. 2. Q: A regular WCT with a monomorphic appearance suggests which of the following etiologies? A. Atrial fibrillation with aberrancy B. Ventricular tachycardia C. Supraventricular tachycardia with aberrant conduction D. Sinus tachycardia with bundle branch block Answer: B. Ventricular tachycardia Rationale: A regular, monomorphic WCT is more likely to be ventricular tachycardia, especially if the patient has a history of structural heart disease or previous myocardial infarction. 3. Q: In the context of WCT, a history of structural heart disease primarily increases the likelihood of which diagnosis? A. Atrial flutter B. Ventricular fibrillation C. Ventricular tachycardia D. Pre-excited atrial arrhythmias Answer: C. Ventricular tachycardia Rationale: Patients with structural heart disease are at a higher risk for ventricular tachycardia due to scarred or damaged myocardial tissue that can serve as a substrate for reentrant circuits. 4. Q: Which of the following ECG findings is most suggestive of ventricular tachycardia in WCT? A. P wave preceding each QRS complex B. Absence of an RS complex in all precordial leads