Effects of Beta-Adrenergic Agents on Hypokalemia

288 Communications to the Editor food should interfere with nitrate effects.’ Recent hemodynamic studies in coronary patients indicate increased cardiac and stroke index without changes in mean arterial or pulmonary wedge pressures, which is consistent with the effect of food on STI in our Previous studies of normal conscious dogs were also in agreement, indicating an enhanced inotropic state during the postprandial period.3 These findings could have had a bearing on the altered thallium myocardial kinetics reported by Wilson and colleagues, perhaps through alterations in flow, and as the authors suggest, myocardial metabolism.