All of the following statements regarding cardiac glycosides are true EXCEPT:
a) They inhibit the Na+/K+-ATPase and thereby increase intracellular Ca++ in myocardial cells
b) They cause a decrease in vagal tone
c) Children tolerate higher doses of digitalis than do adults
d) The most frequent cause of digitalis intoxication is concurrent administration of diuretics that deplete K+
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B
B
C
B
B
B
B
C