药理学习题第26章 E 心衰药.doc

Chapter 26 Drugs used in congestive heart failure1. 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. BB. 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+.E. A and C(B)2. All of the following statements regarding cardiac glycosides are true EXCEPT: BA. They inhibit the activity of the Na+/K+-ATPase. BB. They decrease intracellular concentrations of calcium in myocytes. C. They increase vagal tone. D. They have a very low therapeutic index.E. A and C(B)3. All of the following statements regarding cardiac glycoside-induced ventricular tachyarrhythmias are true EXCEPT: CA. Lidocaine is a drug of choice in treatment. B. Digibind should be used in life-threatening cases. C. They occur more frequently in patients with hyperkalemia than those with hypokalemia. D. They are more likely to occur in patients with a severely damaged heart.E. A and B(C)4. All of the following statements regarding digitalis are true EXCEPT: AA. It increases the rate of calcium efflux from cardiac myocytes. B. It inhibits the sodium-potassium ATPase. C. It does not reduce overall mortality in patients with heart failure compared with placebo. D. It should not be given in combination with quinidine.E. B and C(A)。