Question

i need help answering questions 12,13,14 please

12. You receive an order for 18 mmol of potassium phosphate in 250mL 0.9% NaCl. Calculate the amount of potassium phosphate in milliliters needed to compound this solution. The concentration of your vial is 4.4mEq/mL 3mmol/mL. Answer 13. A medication order for a patient weighing 154 lbs calls fr 0.25mg amphotericin B per kilogram of body weight to be added to 500mL of D5W. If the amphotericin B is to be obtained from a reconstituted injection that contains 50mg/10mL, how many milliters should be added to the bag of D5W? Answer 14. An epidural infusion order is received for fentanyl 4mcg/mL and 0.1% bupivacaine in 250mL 0.9% NaCl. If the fentanyl concentration is 50mcg/mL and the bupivacaine concentration is 0.5%, calculate the number of milliliters of fentanyl, bupivacaine and 0.9% NaCl needed to compound the solution

Answer 1

12. The ordered dose of potassium phosphate is 18mmol in 250ml of 0.9% NaCl

Available concentration of vial is 4mEq / ml = 3mmol

Means 1 ml of concentration has 3mmol

Then for 18mmol of concentration we should take 6 ml of the concentration

13. The ordered dose of amphotericin B is 0.25mg/kg

Weight of the patients is 154 lbs = 154 × 0.45

= 69.3 kg

So, ordered dose will be 0.25 × 69.3 = 17.3 mg

Available dose of amphotericin B is 50mg in 10ml

50 mg of amphotericin B is present in 10ml

1mg of amphotericin B will be present in 10/50

Then 17.3 mg of amphotericin B will be present in 10/50× 17.3

= 3.46 ml of available drug contains 17.3 mg of amphotericin B.