. "Any process that increases the force with which the cardiac muscles of the heart pump blood through the circulatory system as a result of the presence of epinephrine or norepinephrine in the bloodstream or released from the nerve endings." . . . "positive regulation of the force of heart contraction by epinephrine-norepinephrine" . "increased force of heart contraction by adrenaline-noradrenaline" . "increased force of heart contraction by epinephrine-norepinephrine" . "increased inotropy by epinephrine-norepinephrine" . "increased strength of cardiac contraction by epinephrine-norepinephrine" . "positive regulation of heart contraction by adrenaline-noradrenaline" . "positive regulation of heart contraction by epinephrine-norepinephrine" . . . . . . .