Above the ventricles; especially applied to rhythms originating from centers proximal to the ventricles, namely in the atrium, AV node, or AV junction, in contrast to rhythms arising in the ventricles themselves.
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su·pra·ven·tric·u·lar -ven-'trik-yə-lər adj relating to or being a rhythmic abnormality of the heart caused by impulses originating above the ventricles (as in the atrioventricular node) <\supraventricular tachycardia>
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su·pra·ven·tric·u·lar (soo″prə-vən-trikґu-lər) situated or occurring superior to the ventricles, especially in an atrium or atrioventricular node.Medical dictionary. 2011.