familial idiopathic dilatation of the right atrium
Findings
No curated finding names familial idiopathic dilatation of the right atrium yet. Everything below is reference data from Mondo, HPO and GenCC, not evidence about what affects it.
Definition
Idiopathic dilatation of the right atrium (IDRA) is a rare congenital heart malformation of unknown etiology that is characterized by an extremely dilated right atrium, and that is usually asymptomatic and fortuitously discovered by echocardiography or chest radiography, and can be sometimes associated with other anomalies such as atrial arrhythmias (e.g. atrial flutter, atrial fibrillation, supraventricular tachycardia), severe tricuspid regurgitation, or atrial thrombus that could lead to potentially life-threatening thromboembolic complications.
Definition from the Mondo Disease Ontology (MONDO:0015666), read 2026-09-29. CC BY 4.0.
Features
24 features
What the disease is reported to present with, and how often among people who have it — never how often a feature means the disease. HPO, annotations 2026-09-02.
- Atrial septal dilatationHPOHP:0011995
- Very frequent (80% to 99% of cases)
- Right atrial enlargementHPO · MondoHP:0030718
- Very frequent (80% to 99% of cases)
- Abnormal cardiac ventricular functionHPOHP:0030872
- Frequent (30% to 79% of cases)
- Abnormal vena cava morphologyHPOHP:0005345
- Frequent (30% to 79% of cases)
- Abnormality of the hepatic vasculatureHPOHP:0006707
- Frequent (30% to 79% of cases)
- ArrhythmiaHPOHP:0011675
- Frequent (30% to 79% of cases)
Show the remaining 12
- Midsystolic murmurHPOHP:0031665
- Frequent (30% to 79% of cases)
- PalpitationsHPOHP:0001962
- Frequent (30% to 79% of cases)
- Reduced left ventricular ejection fractionHPOHP:0012664
- Frequent (30% to 79% of cases)
- Right ventricular hypertrophyHPOHP:0001667
- Frequent (30% to 79% of cases)
- SyncopeHPOHP:0001279
- Frequent (30% to 79% of cases)
- Tricuspid regurgitationHPOHP:0005180
- Frequent (30% to 79% of cases)
Where it sits
Other names
1 name
Resolves to: familial idiopathic dilatation of the right atrium
- Also called
- familial idiopathic dilatation of the right atrium (disease)