Severe arrhythmias refer to life-threatening irregularities in the heart's rhythm, which can result in inadequate blood flow to the body's organs. These conditions can manifest as tachycardia (rapid heart rate), bradycardia (slow heart rate), or irregular heartbeats such as atrial fibrillation and ventricular fibrillation. In the context of toxicology, these arrhythmias can be induced by exposure to certain chemicals, drugs, or environmental toxins.
