Answers
15. Given data
Total dose of insulin = 100 units/ 250 mL
Total volume of mixture = 250 m L
Thus 1 m L bag mixture contains 100 / 250 = 0.4units of insulin (Stock strength)
Dose to be administered (Desired dose) = 10 units / hr
Formula for Amount of solution to be given = ( Desired dose 
Stock strength ) x stock volume
= (10 0.4) x 1
= 25 m L / hr
a. Thus the answer is, The rate of infusion is 25 m L / hr
Volume to be infused = 250 mL
Rate of infusion is 25m L / Hr
The total hours of infusion to be calculated, let us take it as "x"
Electronic flow rate formula is ( Volume in mL Time in hours ) = flow rate in mL / hr
Thus, 250 x = 25
25x = 250
x = 250 25
= 10 hours
b. Thus the answer is10 hours
16. Given data
Amount of heparin ordered( Desired dose) = 1500 units
Total dose of heparin = 25000 unit
Total volume of mixture = 500 mL
so 1 mL = 25000 / 500 = 50 unit of heparin (Dose in hand)
The formula for dose calculation is ( Desired dose / Dose in hand) x volume of drug = dose to be administered
thus, (1500 / 50) x 1 mL = 30 mL / hr
Thus the answer is 30 m L / hr
17. Given data
Total amount of digoxin to be administered ( desired dose )= 0.75 mg
Concentration of drug (Dose in hand) = 0.1 mg / m L
The formula for dose calculation is ( Desired dose / Dose in hand) x volume of drug = dose to be administered
Thus, (0.75 mg / 0.1 mg) x 1 m L = 7.5 m L
a. Total number of m L to be administered is 7.5 mL
b.
Amount of drug administered in 5 minutes = 7.5 m L
so Amount of drug will be administered in one minute = 7.5 / 5 = 1.5 m L
1 Minute = 60 seconds
1.5 mL in 60 seconds
'x' m L in 30 seconds
Thus,( 1.5 x 30) / 60 = .75 m L
Thus the amount of mL push in 30 seconds is 0.75 mL
c.
Number of seconds needed to push 1 m L of solution = 1m L x 60 seconds / 1.5 mL = 40 seconds
Thus the answer is 40 seconds