As a medical professional with expertise in cardiology, I can tell you that a third-degree heart block is indeed a serious condition. This type of blockage occurs when the electrical signals that coordinate heartbeats are completely disrupted, preventing signals from the upper chambers (atria) from reaching the lower chambers (ventricles) of the heart. This can lead to a very slow heart rate, which may not be sufficient to meet the body's needs for blood and oxygen. Patients with this condition often experience symptoms such as fatigue, shortness of breath, dizziness, and fainting. In some cases, they may not experience any symptoms at all, but the risk of a heart attack is still significant. Without treatment, which typically involves the implantation of a pacemaker, the consequences can be life-threatening. 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 >>