discordant alternation

dis·cor·dant al·ter·na·tion

alternation in cardiac activities of either the systemic or the pulmonary circulation, but not of both, or in both but oppositely directed in each.

dis·cor·dant al·ter·na·tion

(dis-kōr'dănt awl'tĕr-nā'shŭn)
Alternation in cardiac activities of either the systemic or the pulmonary circulation, but not of both, or in both but oppositely directed in each.