NURS 325 COMPLEX DORIS TURNER MED MATH QUESTIONS COMPLETE SOLUTIONS

Complex / Doris Turner Med Math Questions 1. Problem type: IV infusion rate + infusion pump Medication: azithromycin PROBLEM Suppose Mrs. Turner’s orders call for 500 mg of azithromycin to be administered intravenously for community­acquired pneumonia. The solution has been diluted to a concentration of 2 mg/mL and needs to be administered over 1 hour. At what rate should the infusion pump be set? HINT Start by figuring out how many milliliters will be needed to administer the ordered dose. SAMPLE SOLUTION 1. Determine how many milliliters of the concentration will be delivered to administer the ordered dose. 500 mg x 1 mL = 250 mL 2 mg 2. Divide the total number of mL needed to deliver the 500 mg by the expected duration of 1 hour. 250 mL = 250 mL/hr 1 hr ANSWER Number: 250 Units / Rate: mL/hr 2. Problem type: Dosage calculation + Stock on hand Medication: venlafaxine PROBLEM Mrs. Turner’s daily medications include venlafaxine extended­release, 150 mg, by mouth, once a day. However, the hospital pharmacy only carries 75 mg extended­release tablets. How many tablets of venlafaxine extended­release should be administered to her? HINT You can use the equation below, where X is the number of tablets that should be administered. D (ordered dose) x Quantity = X H (dose on hand) SAMPLE SOLUTION 1. Determine what information you have. D (ordered dose) = 150 mg H (dose on hand) = 75 mg Q (quantity) = 1 tablet 2. Plug into the equation and solve. D (150 mg) x 1 tablet = X H (75 mg) X = 2 tablets ANSWER Number: 2 Units: tablets 3. Problem type: Total daily dosage Medication: Acetaminophen @ hospital ­ hypothetical Suppose Mrs. Turner’s provider updated her order for 325 mg, 2 tabs, by mouth q6h PRN temp. 100.5 F to 325 mg, 2 tabs, by mouth q4h PRN temp. 100.5 F. The Davis’s Drug Guide reports that acetaminophen has a maximum recommended dosage of 4 g/day.