What does a left bundle branch block mean?

As a medical professional with expertise in cardiology, I can explain what a left bundle branch block (LBBB) means. A left bundle branch block is a type of heart conduction abnormality that can be identified on an electrocardiogram (ECG or EKG). The heart's electrical conduction system is responsible for coordinating the contractions of the heart muscle. The bundle branches are part of this system, and they are located within the ventricles. The left bundle branch is responsible for the electrical activation of the left ventricle. In a normal heart rhythm, the electrical signal travels down the bundle branches to the ventricles, causing them to contract and pump blood. However, in the case of an LBBB, there is a delay or blockage in the left bundle branch, which means the electrical signal is delayed in reaching the left ventricle. As a result, the left ventricle may contract later and with less force than the right ventricle, potentially affecting the heart's ability to pump blood effectively. An LBBB can be caused by various factors, including: - Coronary artery disease: Narrowing of the arteries that supply blood to the heart muscle. - Hypertensive heart disease: Heart muscle changes due to high blood pressure. - Valvular heart disease: Abnormalities in the heart's valves. - Cardiomyopathy: A disease of the heart muscle itself. - Congenital heart defects: Structural problems present at birth. - Inflammatory or infectious conditions: Such as myocarditis. It's important to note that an LBBB can also be seen in individuals with no underlying heart disease, known as a non-pathological LBBB. However, when an LBBB is detected, it is crucial to consult with a healthcare provider to determine the cause and the appropriate course of action.

Left bundle branch block (LBBB) is a cardiac conduction abnormality seen on the electrocardiogram (ECG). In this condition, activation of the left ventricle of the heart is delayed, which causes the left ventricle to contract later than the right ventricle.