A slowed heart rate may lead to fainting, irregular heart rhythms and other serious complications.īecause bundle branch block affects the electrical activity of the heart, it can sometimes complicate the accurate diagnosis of other heart conditions, especially heart attacks. The lack of signaling can slow the heart rate. If both the right and the left bundles are blocked, the main complication is a complete blockage of the electric signaling from the upper to the lower chambers of the heart. Having high blood pressure or heart disease increases the risk of having bundle branch block. Bundle branch block is more common in older adults than in younger people. Risk factors for bundle branch block include: High blood pressure in the pulmonary arteries (pulmonary hypertension).Heart structure problems that are present at birth (congenital heart defects) - such as a hole in the wall separating the upper chambers of the heart (atrial septal defect) Intraventricular conduction delays (IVCDs) are hallmarks of heart failure (HF) and structural heart disease (SHD) but their prognostic value for HF and SHD.Blood clot in the lungs (pulmonary embolism).Thickened, stiffened or weakened heart muscle (cardiomyopathy).Inflammation of the heart muscle (myocarditis).Sometimes, there is no known cause.Ĭauses can include: Left bundle branch block The cause for bundle branch blocks can differ depending on whether the left or the right bundle branch is affected. As a result, the heart beats irregularly. If one or both of these branch bundles are damaged - due to a heart attack, for example - the electrical impulses can become blocked. These impulses travel along a pathway, including two branches called the right and the left bundles. We have found that IVCD is an important ECG predictor of prognosis in patients with CHF.Electrical impulses within the heart muscle cause it to beat (contract). Further analysis of IVCD and QTc showed that, for different cut-off values, IVCD is better than QTc, and that there is a graded increase in mortality with increasing value of IVCD. The addition of plasma sodium, age and NYHA class had no added benefit on the predictive power of the model. A model based on multivariate analysis showed that IVCD, MVO2 and left ventricular ejection fraction (LVEF) were the best predictors of mortality. These abnormalities can be due to pathology in either the left bundle of His or its fascicular branches or the right bundle of His or its combination resulting in changes to the QRS complex. On bivariate analysis, IVCD and MVO2 were better predictors when combined together. Intraventricular conduction delays (IVCDs) refers to abnormalities in the intraventricular propagation of supraventricular impulses. TABLE 2 Reduction of Variance-Related Parameters in Normal Conduction and. On univariate analysis by the Cox proportional Hazard method, intraventricular conduction delay (IVCD) and QTc were identified as predictors of mortality. IVCD indeterminate-type ventricular conduction delay RBBB right bundle branch block.
Cardiopulmonary exercise testing and radionuclide ventriculogram were also performed where possible. Relevant data from 241 CHF patients were analysed retrospectively. The purpose of this study was (a) to identify the best ECG parameter that predicts mortality, (b) to evaluate the prognostic marker of ECG against well-established indicators of prognosis. Chronic heart failure (CHF) is associated with high mortality, and there are several established clinical and laboratory parameters that predict mortality in CHF.
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