**Question:** Which is not true regarding Bernard syndrome?

**Core Concept:** Bernard syndrome is a rare and severe form of Wolff-Parkinson-White (WPW) syndrome, characterized by rapid atrial fibrillation and life-threatening ventricular arrhythmias. WPW syndrome is caused by an accessory pathway connecting the atria to the ventricles, allowing rapid conduction between the atria and ventricles.

**Why the Correct Answer is Right:** Bernard syndrome is uncommon and often associated with Wolff-Parkinson-White (WPW) syndrome. The correct answer (D) represents a characteristic feature of WPW syndrome but not Bernard syndrome.

**Why Each Wrong Option is Incorrect:**

A. Bernard syndrome is characterized by junctional bradycardia (slow heart rate), which is not a defining feature of the syndrome.

B. Bernard syndrome is typically associated with life-threatening ventricular arrhythmias, a feature that is also present in WPW syndrome.

C. Bernard syndrome often presents with hemodynamically stable ventricular tachycardia, which is not accurate for the syndrome.

**Clinical Pearl / High-Yield Fact:** In Bernard syndrome, the rapid atrial fibrillation can lead to hemodynamically unstable ventricular arrhythmias, such as ventricular fibrillation, which is a significant clinical feature and distinguishes it from WPW syndrome.

**Correct Answer:** C. Bernard syndrome often presents with hemodynamically stable ventricular tachycardia is not true, as the syndrome is characterized by the rapid atrial fibrillation, not stable ventricular tachycardia.