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Takotsubo cardiomyopathy is an acute heart failure syndrome characterized by myocardial hypocontractility from the mid left ventricle to the apex. It is precipitated by extreme stress and can be triggered by intravenous catecholamine administration, particularly epinephrine. Despite its grave presentation, Takotsubo cardiomyopathy is rapidly reversible, with generally good prognosis. We hypothesized that this represents switching of epinephrine signaling through the pleiotropic β(2)-adrenergic receptor (β(2)AR) from canonical stimulatory G-protein-activated cardiostimulant to inhibitory G-protein-activated cardiodepressant pathways.

High Levels of Circulating Epinephrine Trigger Apical Cardiodepression in a β 2 -Adrenergic Receptor/G i –Dependent Manner

High Levels of Circulating Epinephrine Trigger Apical Cardiodepression in a β ₂ -Adrenergic Receptor/G _i –Dependent Manner