As a medical professional with expertise in cardiology, I can tell you that the seriousness of a heart arrhythmia can vary greatly depending on several factors. Arrhythmias are changes in the normal rhythm of the heartbeat, and they can range from harmless to life-threatening. Mild arrhythmias may not require any treatment and might not even be noticed by the individual. However, some types of arrhythmias can be quite serious. For instance, ventricular tachycardia and ventricular fibrillation are considered malignant because they can lead to sudden cardiac arrest, which is a medical emergency. The severity of an arrhythmia is often assessed based on its type, how often it occurs, what underlying heart conditions may be present, and the impact it has on the individual's quality of life and daily activities. Treatment options can range from lifestyle changes, medications, to procedures like catheter ablation or the implantation of a pacemaker or **implantable cardioverter defibrillator (ICD)**. It's important for individuals experiencing symptoms of an arrhythmia to seek medical attention promptly for a proper diagnosis and to determine the appropriate course of action. read more >>

Many heart arrhythmias are harmless; however, if they are particularly abnormal, or result from a weak or damaged heart, arrhythmias can cause serious and even potentially fatal symptoms. ... Symptoms of arrhythmia often include dizziness, breathlessness, and palpitations.read more >>