Certified Emergency Nurse (CEN) Practice Test

An internal cardiac defibrillator can indeed cause the issue of delivering unnecessary shocks. This malfunction can occur due to several factors, such as improper sensing of the heart's rhythm or interference from electrical devices. When the defibrillator misinterprets a normal heart rhythm as a dangerous arrhythmia, it may trigger a shock even when it is not warranted. This can lead to physical distress for the patient and may disrupt normal cardiac function.

The ability of a defibrillator to accurately detect and respond to life-threatening arrhythmias is critical for its effective function. Misfiring—sending shocks when not needed—can not only cause discomfort but also have potential complications including cardiomyopathy or even provoking further arrhythmias. Understanding this malfunction emphasizes the importance of regular device checks and patient education regarding the function and limitations of their implanted defibrillators.