As a medical professional with expertise in cardiology, I can tell you that a heart block can indeed be serious, depending on its severity and the underlying cause. There are three degrees of heart block, with third-degree or complete heart block being the most severe. In this condition, the electrical signals that normally coordinate the contractions of the heart's upper and lower chambers are completely disrupted. This can lead to a significantly slower heart rate, which may not be sufficient to maintain proper blood flow to the body's organs and tissues. Patients with heart disease are more likely to develop heart block, and in the case of third-degree heart block, the risk of serious complications, including heart attack, is substantial. Without intervention, such as the implantation of a pacemaker, the consequences can be life-threatening. A pacemaker is a medical device that can help regulate the heart's rhythm by sending electrical impulses to the heart when its natural pacemaker fails to do so. read more >>

Third-degree or complete heart block is when electrical signals do not travel between the upper and lower chambers of the heart. It is more common in patients with heart disease. Without a pacemaker, there is a serious risk of heart attack.read more >>