Author Question: Xanthine derivatives are bronchodilators with which actions in the body? (Select all that apply.) ... (Read 21 times)

bclement10 · **on:** Jul 23, 2018

Xanthine derivatives are bronchodilators with which actions in the body? (Select all that apply.)

a. Smooth-muscle relaxation
b. Kidney diuresis
c. Stimulation of the myocardium
d. Decrease in respiratory rate
e. Decrease in heart rate

Question 2

The therapeutic level of theophylline is directly related to the blood levels achieved from the administration of the medication on a regular schedule. Which factors affect therapeutic levels? (Select all that apply.)

a. Variance in rates of absorption
b. Fluid intake
c. Metabolism
d. Age of the patient
e. Elimination

mariahkathleeen · **Reply #1 on:** Jul 23, 2018

Answer to Question 1

ANS: A, B, C
The main actions of xanthine-derivative bronchodilators are to relax the smooth-muscle cells in the bronchi, directly produce diuresis of the kidneys, and stimulate the myocardium.

Answer to Question 2

ANS: A, C, D, E
Factors affecting therapeutic theophylline blood levels are variance in rate of absorption, metabolism, and elimination of the drug; differing levels of theophylline in each product; and the patient's age.