Vascular pressures, cardiac output (Fick), and coronary flow (N2O Fick) were measured before and after the induction of hypermagnesemia with MgCl2. A significant tachycardia and hypotension resulted. There was no effect upon coronary flow, coronary vascular resistance, or myocardial O2 and CO2 metabolism.
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Maxwell et al. (1965) studied this question.