An arrhythmia, or abnormal heartbeat, is a medical ailment characterized by an excessively rapid, irregular, or erratic heartbeat. A number ... An arrhythmia, or abnormal heartbeat, is a medical ailment characterized by an excessively rapid, irregular, or erratic heartbeat. A number of things can interfere with the heart's regular rhythm, including: One of the most prevalent forms of irregular heartbeat is atrial fibrillation (AFib), in which the heart's top chambers (the atria) quiver rather than beat efficiently. Bradycardia is the medical term for an abnormally slow heartbeat, typically less than 60 beats per minute. It might be brought on by advanced age, specific drugs, or heart problems. When the heart beats too rapidly, usually more than 100 beats per minute, it is referred to as tachycardia. Stress, physical activity, drugs, and a number of medical disorders can all contribute to it.Excessive, irregular heartbeats that start in the upper chambers of the heart (premature atrial contractions) or lower chambers (premature ventricular contractions) are known as premature contractions.Heart block: This happens when there is a delay or obstruction in the electrical signals that regulate the heartbeat. Palpitations (feeling as though your heart is beating too quickly or skips a beat), lightheadedness, dizziness, shortness of breath, chest pain, and fainting are some signs of an irregular heartbeat.The kind and severity of the illness determine how to treat an irregular heartbeat. It could involve prescription drugs, dietary adjustments (like cutting back on alcohol or caffeine), surgical operations (like cardioversion to restore normal rhythm), or implanted gadgets (like pacemakers or defibrillators). It is imperative that you get medical attention for an appropriate diagnosis and treatment if you suspect that your heartbeat is irregular or if you have any worrisome symptoms.