second-degree block

second-degree block

See Heart block.
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Clinically, second-degree block in the intrahisian or infrahisian system is indicative of impending high-grade or complete heart block, which may occur paroxysmally, and hemodynamic survival depends on the emergence of a low junctional (distal His), fascicular, or idioventricular rhythm.
Type II second-degree block is usually representative of a more advanced conduction abnormality of the His-Purkinje system.
In fetuses treated with dexamethasone, one of six with second-degree block progressed to third degree, and three remained in second degree (one paced, two progressed to third degree); two reverted to NSR (one progressed to second).