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First-degree heart block, also called first-degree atrioventricular (AV) block, is a cardiac conduction abnormality in which electrical impulses from the atria reach the ventricles more slowly than normal. It occurs due to delayed conduction through the AV node or, less commonly, through the His-Purkinje system. Although it is usually a mild form of AV block and may be asymptomatic, careful assessment is important in critically ill patients because it may be associated with underlying cardiac disease, medications, electrolyte abnormalities, or progression to a higher degree of heart block. The main ____ ______ _____ ______ __________ ___ ____ _______ ________ ______ _____.
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