What is the primary effect of a defibrillator?

• A. To stimulate heart contraction
• B. To correct cardiac rhythms
• C. To monitor heart rates
• D. To perform CPR

Answer: (B)

The primary effect of a defibrillator is to correct cardiac rhythms. This device is used in emergency situations for patients experiencing life-threatening arrhythmias, such as ventricular fibrillation or pulseless ventricular tachycardia. The defibrillator delivers a controlled electrical shock to the heart, which can reset the heart’s electrical system, allowing it to regain a normal rhythm.

In contrast, while stimulating heart contractions might happen directly or indirectly following a successful defibrillation, the main purpose is to restore the normal rhythm rather than merely stimulating the heart. Monitoring heart rates is not a function of a defibrillator; rather, it is typically performed using a separate device dedicated to rhythm analysis. Performing CPR is an essential life-saving technique administered before and during defibrillation; however, it is not the function of the defibrillator itself. The primary role of the defibrillator focuses on restoring normal electrical activity in the heart to prevent sudden cardiac arrest from becoming fatal.