Trait
Incomplete right bundle branch block
Right bundle branch block (RBBB) represents an abnormality in the intraventricular electrical conduction system of the human heart, generating enlarged QRS and modified vectors on the electrocardiogram (ECG). Incomplete RBBB (IRBBB) is defined by (i) QRS duration between 110 and 120 ms in adults; (ii) rsr, rsR, or rSR in leads V1 or V2. The R or r deflection is usually wider than the initial R wave. In a minority of patients, a wide and often notched R wave pattern may be seen in leads V1 and/or V2; (iii) S wave of greater duration than R wave or greater than 40 ms in leads I and V6 in adults; and (iv) Normal R peak time in leads V5 and V6 but greater than 50 ms in lead V1. The first 3 criteria should be present to make the diagnosis. When a pure dominant R wave with or without a notch is present in V1, criterion 4 should be satisfied.
Summary
- Body system
- Abnormality of the cardiovascular system
Reference genomeGRCh38hg38
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Changes in these genes cause rare conditions in which Incomplete right bundle branch block is seen. Most people with this trait have none of those conditions, and a gene on this list says nothing about anyone's own genome.
How often is among people with one of the gene's conditions, the most often across them, as the Human Phenotype Ontology records it. These pages describe traits and the research behind them; they are not a diagnosis, and a doctor or genetic counsellor is the person to ask about symptoms.
Broader traits
Where this comes from
- The Human Phenotype Ontology, release 2026-09-01: the trait, its names, its definition and the genes linked to it. Find out more at hpo.jax.org.
- Data release 2026.10.16-c6eea6bf.
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