Question

17. How much of a 3% Potassium Chloride solution should be administered for a patient whose doctor has ordered 65 mg Potassium Chloride IM stat? 18. Order is for Affinitas for a child weighing 18.75 kg and who is 48 cm tall. The Affinitas label indicates that an infant is to receive 40 mg per MIM. The supply dosage is 20 mg/3 mlu What dosage is necessary for this patient and how much of the solution should you administer? EXTRA CREDIT: Order is for 3.5 mL Hetacillin IM bid. Available solution contains 0.28% Hetacillin. How much do you administer?

Answer 1

No.17.

Order dose 65 mg Potassium chloride IM stat

Available quantity 3 % Potassium chloride

It means 3 gm of Potassium chloride in 100 ml = 3000 mg of Potassium chloride in 100 ml

So $100 ml \div 3000 mg \times 65 ml = 2.17 ml$

Answer - 2.17 ml should be administered to the patient.

No.18.

Order dose Affinitac 40 mg/m² IM

Child weighing 18.75 kg and who is 40 cm tall

So total BSA of the child will be

Mosteller formula = √(weight in kg $\times$ height in cm/3600)

= √(18.75 kg $\times$ 40 cm/3600)

=  √(750/3600)

=  √0.208

= 0.45 m²

So total BSA of the child is 0.45

Order dose Affinitac 40 mg/m² IM

$40 mg/m^{2} \times 0.45 m^{2} = 18 mg$

The child required 18 mg/dose.

Available quantity 20 mg/3 ml

So

3ml = 20mg x 18mg = 2.7ml

Answer - The child required 18 mg and the nurse will administer 2.7 ml.

1.

Order dose 3.5 ml Hetacillin IM bid

Available quantity 0.2 % Hetacillin

It means 100 ml solution contain 0.28 gm Hetacillin = 100 ml solution contain 280 mg of Hetacillin

So, $280 mg \div 100 ml \times3.5 ml = 9.8 mg$

Answer - The order dose is 3.5 ml that means the nurse will administer 9.8 mg.