A patient is receiving an intravenous infusion containing 40 mEq of potassium chloride in 1000 mL...

A patient is receiving an intravenous infusion
containing 40 mEq of potassium chloride in 1000
mL of dextrose 5% in half–normal saline. The
infusion has been running at a rate of 80 mL/h for
the past 6.5 hours. Following a lab report showing
the patient’s serum potassium level to be 3.5
mEq/L, the physician decides to increase the
potassium dose while slowing the infusion flow
rate to 40 mL/h. The physician prescribes
potassium chloride injection (14.9% KCl) to be
added to the IV such that the patient will receive a
total of 80 mEq of potassium over the remaining
time for completion of the infusion. How many
milliliters of the potassium chloride injection
should be added by the pharmacist?

Expert Solution

80 ml/hr (x) 6.5 hr = 520 ml administered (480 ml remain

480 ml/ 40 ml/hr = 12 hours of fluid available

40 mEq KCl in 1000 ml = 4 mEq per 100 ml

X mEq/520 ml =4 mEq /100 ml =20.8 mEq of KCl

40 mEq (minus) 20.8 mEq = 19.2 mEq that remain in the bag

Could also do for KCl

X mEq /480 ml =4 mEq /100 ml =19.2 mEq of KCl remaining in the bag

80 mEq (minus) 19.2 mEq = 60.8 mEq needed to add to the bag

K = 39 + Cl = 35.5 = 74.5 mg per mEq (x) 60.8 mEq = 4529.6 mg needed

14.9% = 149 mg per ml

4529.6 mg (div by) 149 mg per ml = 30.4 ml----answer

queen_honey_blossom answered 2 years ago

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