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HUMAN PHENOTYPE - ANNOTATIONS

The Human Phenotype Ontology (HPO) is downloaded weekly from http://compbio.charite.de/hudson/job/hpo/lastStableBuild/artifact/ontology/release/hp.obo. The file downloaded is considered the "last stable build" available for the ontology. For more about the HPO, view their website at http://www.human-phenotype-ontology.org/.
Term:Abnormal U wave
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Accession:HP:0025070 term browser browse the term
Definition:An anomaly of the U wave of the electrocardiogram (EKG). The U wave is a small (0.5 mm) deflection immediately following the T wave, usually in the same direction as the T wave. It is best seen in leads V2 and V3.
Comment:U waves represent prolonged repolarisation of myocardial M cells. Under normal conditions the M cells are electrically coupled to adjacent cell layers. However, in conditions that produce electrical uncoupling, these M cells have significant effects on repolarisation producing prolonged rounded ST-T waves or U waves. The finding of U wave inversion on an ECG at rest or baseline is a non-specific finding. It is significant when observed post exercise, being originally described in early 1940s. Subsequent studies in the late 1970s, demonstrated a significant correlation of U wave inversion with either left main or LAD disease.


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  Human phenotype 0
    Phenotypic abnormality 0
      Abnormality of the cardiovascular system 0
        Abnormal cardiovascular system physiology 0
          Abnormality of cardiovascular system electrophysiology 0
            Abnormal EKG 0
              Abnormal U wave 0
                Prominent U wave 0
                U wave inversion + 0
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