Question

The doctor orders a continuous infusion (IV) of morphine for a post-operative teenager of 200 mcg/kg q 3 hr. The teenager weighs 105 lbs. You have 2 mg/mL solution of morphine available for IV injection. STATE THE ANSWER IN SCIENTIFIC NOTATION AND CORRECT NUMBER OF SIGNIFICANT FIGURES

a. What rate of infusion (mL/hr) should you set for the IV drip?

b. The continuous infusion device can only hold a total of 25 mL of morphine solution. How long will it be before you have to replace the morphine solution? Express your answer in hours with the remainder converted to minutes. (i.e. your answer should be something like “in 3 hours and 14 minutes”).

Answer 1

Q. No a) . Answer :

* 200 mcg per kg body weight per q3h or 3rd hourly.

* patient weight is 105 lb

* 1 lb= 0.454 kg

* so 105 lb = 47.627 kgs

* morphin available 2mg / ml.

* here 200 mcg means 0.2 mg, because 1 mcg = 0.001 mg.

* so 2 mg= 2000 mcg.

* here 1 ml = 2 mg = 2000 mcg.

patient needs 200 mcg/ kg body weight q3 h.

* so 47.627 × 200 mcg = 9525.4 mcg.

* if it converts into mg multiplies with 1000.

* so 9.525 mg / kg needed in 3 hours.

* here 2 mg avavailable for 1 my.

* so 9.525 devided by 2 means 4.7625 ml may come.

* so it is for three hours.

* for one hour nurse has to administer 1.58 ml. Because 4.7625 devided by 3 hrs.

so finally 1.58 ml / hr should be set by infusion pump.

Q. No b) answer :

q3 h means third hourly , timings are 3, 6, 9, 12, 3, 6, 9, 12.

* if per hour 1.58 ml means it will come for 5 times in 24 hours.

* so after five times of infusion she need to load again, before the finishing of it.

* load in another syringe.

* approximately this solution may come for 16 hrs 40 minutes.

* so after that finishing of the nurse must be load again.