A 42-year-old woman with lightheadedness and recurrent syncope is taken to the emergency department
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A 42-year-old woman with lightheadedness and recurrent syncope is taken to the emergency department where she is given atropine.Her symptoms are relieved by an increase in which of the following?
A.Heart rate
B.Stroke volume
C.Ventricular contractility
D.Ejection fraction
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