Question

paration #6: Dextrose 10% in 12 normal saline and KCl 20 mEq 1000 ml intravenous solution Patient weight: 208-Ibs Potassium chloride 20 mEq injection solution (2 mEq/mL) D10W/ 42 NS Injection solution (1 L IV bag) 10-ml Supplies needed: 1000-ml Sterile needles and syringes Procedure: 1. Calculate the required quantity of each ingredient 2. Weigh and/or measure each ingredient accurately 3. Using aseptic technique, transfer the calculated volume of potassium chloride injection solution to the D10W/ 12 NS Injection solution IV bag. 4. Mix well 5. Cover injection port with a tamper seal. Calculations: The intravenous infusion is administered through an IV set that delivers 20 drops/mL. The infusion has been running at a rate of 15 drops/minute for 8 hours. Since the start of the infusion: 1. How many mEq of KCl have been administered? 2. How many grams of KCI have been administered? 3. How many millimoles of KCl have been administered? 4. What is the total osmolarity (mOsmol/L) of the compounded sterile preparation?

Answer 1

Ans.1- 20 drops present in 1ml

So 15 drop present in =1/20*15=3/4ml

Total fluid given in 8 hrs 3/4*60*8= 360ml

Because 10ml contains 20meq kcl so, 360 ml contains 20/10*360=720meq

And.2 - molecular weight of kcl is 74.5 mg/ mmol

10.07 meq of kcl contain 750 mg of kcl

720 meq contain 750/10.07*720= 53624.62 mg = 53.62gm

And.3 - 1meq = 1 mmol (for substance)

So , 720 mmol administered

Ans.4 - one kcl molecule contain 2 atom or particle

So osmolarity is 2 * 720* 1000/360 = 4000 mosmol/ lit