What does a "long QT syndrome" increase the risk for?

What does a "long QT syndrome" increase the risk for?

• A. Bradycardia and heart block
• B. Torsades de Pointes and sudden cardiac arrest
• C. Reduced heart rate and ischemia
• D. Atrial fibrillation and stroke

Answer: (B)

Long QT syndrome is a condition characterized by an abnormal prolongation of the QT interval on the electrocardiogram (ECG), which reflects an extended period for the heart's electrical system to recharge between beats. This prolonged QT interval can lead to life-threatening arrhythmias, particularly Torsades de Pointes, a specific type of polymorphic ventricular tachycardia that is often triggered by a rapid heart rate. If Torsades de Pointes is not promptly addressed, it can lead to more severe outcomes such as sudden cardiac arrest. The mechanism behind the risk involves the disruption of normal electrical conduction in the heart, making it more susceptible to arrhythmias. In light of this, individuals with Long QT syndrome often require monitoring and may need to avoid certain medications or activities that could exacerbate their condition. Treatment may include lifestyle changes, avoidance of triggers, and in some cases, the use of medications or implantation of a defibrillator to prevent dangerous arrhythmias. All these factors together underline the association between long QT syndrome and an increased risk of Torsades de Pointes and sudden cardiac arrest.

Long QT syndrome is a condition characterized by an abnormal prolongation of the QT interval on the electrocardiogram (ECG), which reflects an extended period for the heart's electrical system to recharge between beats. This prolonged QT interval can lead to life-threatening arrhythmias, particularly Torsades de Pointes, a specific type of polymorphic ventricular tachycardia that is often triggered by a rapid heart rate. If Torsades de Pointes is not promptly addressed, it can lead to more severe outcomes such as sudden cardiac arrest.

The mechanism behind the risk involves the disruption of normal electrical conduction in the heart, making it more susceptible to arrhythmias. In light of this, individuals with Long QT syndrome often require monitoring and may need to avoid certain medications or activities that could exacerbate their condition. Treatment may include lifestyle changes, avoidance of triggers, and in some cases, the use of medications or implantation of a defibrillator to prevent dangerous arrhythmias. All these factors together underline the association between long QT syndrome and an increased risk of Torsades de Pointes and sudden cardiac arrest.