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Homework answers / question archive / University of Illinois, Chicago NURS 531 Chapter 21: The heart MULTIPLE CHOICE 1)Delayed after-depolarizations in cardiac tissue typically result from an increased influx of sodium potassium calcium chloride sodium and potassium 2
2. The re-excitation of cardiac tissue prior to the next cardiac impulse occurs in the process known as
3. In persons with atrial fibrillation, digoxin may slow the ventricular rate by
4. Sotalol exerts an antiarrhythmic effect primarily by
5. Drugs that increase serum digoxin levels include
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furosemide |
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cholestyramine |
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amiodarone |
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enalapril |
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hydrochlorothiazide |
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Verapamil is indicated for the treatment of |
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supraventricular tachycardia |
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2. |
ventricular tachycardia |
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atrial fibrillation |
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4. |
ventricular fibrillation |
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cardiac asystole |
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In persons who have had a myocardial infarction, flecainide has been shown to |
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decrease the incidence of ventricular fibrillation |
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2. |
decrease the incidence of atrial fibrillation |
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decrease the incidence of sudden death |
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4. |
increase the frequency of ventricular ectopic beats |
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increase the incidence of sudden death |
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Answer e: increase the incidence of sudden death |
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The pharmacokinetic attributes of amiodarone include |
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rapidly metabolized and excreted |
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a very short elimination half-life |
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a very long elimination half-life |
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distributed only to extracellular fluid |
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limited binding to plasma proteins |
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Dobutamine is useful in treating acute heart failure because of its ability to |
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increase heart rate more than contractile force |
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increase contractile force more than heart rate |
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produce a negative dromotropic effect |
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cause cardiac stimulation and vasoconstriction |
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inhibit phosphodiesterase |
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Digoxin slows AV conduction and decreases heart rate by |
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activating cardiac muscarinic receptors |
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blocking cardiac adrenergic beta-1 receptors |
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antagonizing cardiac calcium channels |
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increasing vagal outflow from the CNS |
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increasing cardiac contractile force |
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The half-life of digoxin is considerably longer in persons with |
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renal insufficiency |
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2. |
pulmonary edema |
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atrial fibrillation |
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hypertension |
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endocarditis |
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Which drug has been shown to reduce mortality in persons who have had a myocardial infarction? |
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amiodarone |
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lidocaine |
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3. |
propranolol |
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4. |
amiodarone |
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5. |
verapamil |
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Hypothyroidism is most likely to occur in persons who are taking |
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sotalol |
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flecainide |
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timolol |
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amiodarone |
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5. |
adenosine |
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Nitroglycerin relieves typical angina pectoris in part by |
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increasing cardiac stroke volume |
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dilating coronary arterioles |
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decreasing cardiac oxygen consumption |
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constricting collateral vessels in the heart |
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increasing blood pressure |
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Nitroglycerin and other organic nitrates produce their vasodilator effect by |
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increasing formation of cyclic AMP |
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increasing formation of cyclic GMP |
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blocking calcium channels |
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4. |
blocking adrenergic alpha receptors |
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activating potassium channels |
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