Cauza blocurilor de ramificare a pachetului poate diferi in functie de afectarea stanga sau a celei din dreapta. Uneori, nu exista o cauza cunoscuta. Cauzele pot include: Bloc de ramura stanga (BRS) • atac de cord (infarct miocardic) • Hipertensiune arteriala (hipertensiune arteriala) • Infectia muschiului cardiac de bacterii sau virus (miocardita)
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bloc de ramura dreapta