Atrial fibrillation, also known simply as AFib, is the same disease just referred to by different names. Atrial fibrillation is caused by various reasons leading to pathological changes in cardiac contractility and conductivity. By using a stethoscope, a doctor can detect irregularities in heart rate and varying intensities of heart sounds. Electrocardiogram (ECG) tests can record the distinctive waveforms of atrial fibrillation. Rapid atrial fibrillation requires medication for treatment. If not effectively treated, long-term atrial fibrillation can lead to heart failure, resulting in insufficient blood supply to the body and causing significant harm.