tachyarrhythmia

Any disturbance of the heart's rhythm, regular or irregular, resulting by convention in a rate over 100 beats/min during physical examination. [tachy- + G. a- priv. + rhythmos, rhythm]

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tachy·ar·rhyth·mia .tak-ē-ā-'rith-mē-ə n arrhythmia characterized by a rapid irregular heartbeat

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tachy·ar·rhyth·mia (tak″e-ə-rithґme-ə) [tachy- + arrhythmia] any disturbance of the heart rhythm in which the heart rate is abnormally increased, usually to greater than 100 beats per minute in an adult.