What disorder have defect in heart's pacemaker or damage to heart tissue?

The disorder characterized by a defect in the heart's pacemaker or damage to heart tissue is known as arrhythmia. This condition can lead to irregular heartbeats, which may result from issues with the sinoatrial node (the heart's natural pacemaker) or from scarring or damage to heart tissue due to previous heart attacks or other factors. Symptoms can vary from palpitations to more serious complications like stroke or heart failure. Treatment options depend on the specific type and severity of the arrhythmia.