peripheral pooling of blood and decreased preload. Blood pressure will usually decrease as a result of the venous dilation. Reflex tachycardia usually follows the drop in blood pressure. Question 20 1 out of 1 points A 70-year-old woman with a history of atrial fibrillation takes digoxin and verapamil to control her health problem. Verapamil achieves a therapeutic effect by
Response Feedback : Verapamil acts by inhibiting the movement of calcium ions across the cardiac and arterial muscle cell membrane. It works preferentially in “slow response” myocardial tissue, such as the SA and AV nodes. Beta blockers inhibit adrenergic receptors and Class IB antiarrhythmics are among the drugs that decrease sodium and potassium conduction. Lidocaine weakens phase 4 diastolic depolarization and decreases the action potential duration and the effective refractory period of Purkinje fibers and ventricular muscle. Question 21 1 out of 1 points A patient has recently been prescribed a drug that treats his hypertension by blocking the sympathetic receptors in his sympathetic nervous system. This action is characteristic of Response Feedback : Those drugs that stimulate sympathetic receptors are referred to as adrenergic or dopaminergic agonists (stimulators) and those that block are referred to as adrenergic antagonists (blockers). Adrenergic antagonism is not synonymous with the action of a cardiotonic drug. Question 22 1 out of 1 points A patient has been prescribed lovastatin for a high cholesterol level. The nurse's teaching plan will include a basic explanation of how the drug produces its therapeutic effect. The nurse will explain that lovastatin lowers cholesterol levels because it Response Feedback : Lovastatin belongs to a group of drugs classified as statins. These drugs work by inhibiting cholesterol synthesis in the liver. Fibric acid derivatives and bile-acid resins also decrease cholesterol levels but they work at different sites. Fibric acid derivatives work on lipoproteins and triglycerides to reduce cholesterol, and bile-acid resins work in the gastrointestinal tract and bind bile salts in the intestine. Lovastatin is not a hormone. Question 23 1 out of 1 points A clinic nurse has been assigned a 49-year-old female patient who has a history of diabetes. A recent diagnosis of hypertension has been made, and the patient has been prescribed a thiazide diuretic and labetalol. The patient will be scheduled to return to the clinic once a month for the next 6 months. A priority action by the nurse
will be to Response Feedback : Monitoring of blood pressure would be the priority assessment in the care of this patient. Questioning the patient about her dietary intake and weighing her would be appropriate, but secondary in importance. It is unnecessary to monitor the patient's respiratory rate.
- Fall '13