# first-degree atrioventricular block

> disease of the electrical conduction system of the heart in which the PR interval is lengthened beyond 0.20 seconds

**Wikidata**: [Q3640986](https://www.wikidata.org/wiki/Q3640986)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/First-degree_atrioventricular_block)  
**Source**: https://4ort.xyz/entity/first-degree-atrioventricular-block


## References

1. Monarch Disease Ontology release 2018-06-29
2. Disease Ontology
3. Freebase Data Dumps. 2013
4. [Identifiers.org](https://registry.identifiers.org/registry/doid)
5. [Source](https://cdn.who.int/media/docs/default-source/classification/icd/icd-10/icd-10-to-meddra-map---june-2023---codes-mapping.xlsx)