Only two prior population studies have assessed the clinical significance of incomplete LBBB (iLBBB) and found no relation to CV mortality (Haataja et al., 2015) (Tervahauta, Pekkanen, Punsar, & Nissinen, 1996). Somewhat surprisingly, one previous study found that incomplete RBBB (iRBBB) was associated with increased all‐cause and CV mortality (Haataja et al., 2015).
#BUNDLE BRANCH BLOCK IVCD FREE#
Previous scientific literature does not provide much information about the prevalence or prognostic significance of incomplete bundle branch blocks in individuals apparently free of CV disease. Isolated left posterior fascicular block (LPFB) is a rare conduction disorder with no clear consensus on prognostic significance without CV disease (Pérez‐Riera et al., 2018). Left anterior fascicular block (LAFB) is usually regarded as a conduction disorder without clinical significance if encountered in asymptomatic individuals (Elizari, Acunzo, and Ferreiro, 2007). The effect of the ECG definitions of LBBB and NSIVCD on outcome has not been reported in prior population studies. On the other hand, non‐specific IVCD (NSIVCD) is considered as an ECG marker of adverse outcome due to its potential association with structural heart disease (Eschalier et al., 2015 Haataja et al., 2015). The results of studies evaluating the prognostic impact of LBBB on all‐cause mortality in subjects without known CV disease are also somewhat conflicting (Haataja et al., 2015 Imanishi et al., 2006 Schneider, Thomas, Kreger, McNamara, & Kannel, 1979), and even the standard electrocardiographic (ECG) criteria for LBBB have been challenged (Strauss, Selvester, & Wagner, 2011). Some authors showed that RBBB was associated with increased all‐cause mortality, while other investigators found no effect on outcome (Bussink et al., 2013 Haataja et al., 2015). In subjects with IVCDs without other evidence of cardiac disease (isolated bundle branch block), published reports show conflicting results. Both right (RBBB) and left bundle branch blocks (LBBB) are associated with adverse outcome in subjects with overt cardiovascular disease (CV Wang et al., 2008 Zhang et al., 2012). The clinical significance of various intraventricular conduction delays (IVCD) depends on the type of the conduction disorder and on the studied patient population.
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