Rare diseases · Sign or symptom
Abnormal second heart sound
HP:0031661
What it means
Any anomaly of the second heart sound (S2), which is produced by aortic (A2) and pulmonic (P2) valve closure. The A2-P2 interval normally increases with inspiration and narrows with expiration.
Part of the broader category
Abnormal second heart sound
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Start free with EleplanThis page uses the Human Phenotype Ontology (2026-06-23) — Human Phenotype Ontology Consortium, hpo.jax.org. Disease associations from Orphanet (INSERM), CC BY 4.0. Content is educational and is not medical advice.