1) An abnormal heart rhythm 
Defective rhythm. See also entries under rhythm. ... Compare: arrhythmia. ... Origin: dys-+ G. Rhythmos, rhythm ... (05 Mar 2000) ... 
(dis-rith´me-ә) disturbance of rhythm, such as of brain waves or the heartbeat. cerebral dysrhythmia , electroencephalographic dysrhythmia disturbance or irregularity in the rhythm of the brain waves as recorded by electroencephalography.
Type: Term Pronunciation: dis-ridh′mē-ă Definitions: 1. Defective rhythm.
dysrhythmia 1. An irregularity in an otherwise normal rhythm, especially of heartbeats or brainwaves. 2. Abnormal, disordered, or disturbed rhythm. 3. An abnormality in an otherwise normal rhythmic pattern, as of brain waves being recorded by an electroencephalograph.
a disturbance of rhythm, as of speech or of brain waves recorded by an electroencephalograph.
an abnormal heart rhythm.