Undetermined Supraventricular Rhythm by ECG Finding

**Semantic type:** Finding

**Definition:** An electrocardiographic finding of a rhythm that cannot be determined from the EKG, but that clearly does not originate in the ventricles or His Purkinje system. Typically, the QRS complexes are narrow, but aberration or preexcitation may be present.

**Synonyms:** - UNDETERMINED SUPRAVENTRICULAR RHYTHM