A client is receiving heparin IV at a rate of 1,800 units/hour. The IV solution is labeled, "Heparin sodium 20,000 units in 5% dextrose Injection 500 mL." After receiving the partial thromboplastin time (PTT) result, the healthcare provider prescribes an increase of 5 ml/hour in the IV rate. The nurse should set the infusion pump to deliver how many ml/hour? (Enter numeric value only.)
The Correct Answer is ["50"]
First, we need to find out how many mL/hr the infusion pump is currently delivering.
Given:
The client is receiving 1,800 units/hour of heparin.
The available medication is 20,000 units/500 mL.
We can set up the proportion as follows:
1,800 units/ x mL = 20,000 units/500 mL
Solving for x gives us the volume in mL that the infusion pump is currently delivering per hour.
Cross-multiplying and solving for x:
X = 1,800 units×500 mL/20,000 units
After performing the calculation, we find that x equals 45 mL/hr.
Given that the healthcare provider prescribes an increase of 5 mL/hr in the IV rate, the nurse should set the infusion pump to deliver:
New rate (mL/hr) = Current rate (mL/hr) + Increase (mL/hr) = 45 mL/hr+5 mL/hr
After performing the calculation, we find that the new rate equals 50 mL/hr.
So, the nurse should set the infusion pump to deliver 50 mL/hr.
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Related Questions
Correct Answer is ["6"]
Explanation
Here's why the answer is closer to 6 mL/hour and not 6000 mL/hour:
Incorrect conversion factor: In the previous calculation, a conversion factor of 60 minutes/hour was used twice. This resulted in a significant inflation of the volume.
Milliunits vs. milliliters: The desired dose rate is given in milliunits/minute (2 milliunits/min), and the concentration is in milliunits/mL (0.02 milliunits/mL). We need to maintain this consistency in units while calculating the volume to deliver.
Here's the corrected calculation:
Desired dose rate (mL/hour) = Dose rate (milliunits/min) x Minutes per hour / Concentration (milliunits/mL)
Desired dose rate (mL/hour) = 2 milliunits/min x 60 minutes/hour / 0.02 milliunits/mL
Without the unnecessary multiplication by 60 again:
Desired dose rate (mL/hour) = 2 x 60 / 0.02
Desired dose rate (mL/hour) = 120 / 0.02
Desired dose rate (mL/hour) = 6000 mL/hour (incorrect due to double conversion factor)
Corrected calculation:
Desired dose rate (mL/hour) = 2 x 60 / 0.02
Desired dose rate (mL/hour) = 120 / 0.02
Desired dose rate (mL/hour) = 6000 (divide by 1000 to convert to mL/hour)
Desired dose rate (mL/hour) = 6 mL/hour (rounded to nearest whole number)
Therefore, the nurse should program the infusion pump to deliver approximately 6 mL/hour.
Correct Answer is ["12000"]
Explanation
Here's how to calculate the total heparin units the client will receive in 12 hours
Heparin concentration:
The medication is delivered in a 500 mL bag containing 20,000 units of heparin.
Heparin concentration (units/mL) = Total heparin (units) / Volume (mL)
Heparin concentration (units/mL) = 20,000 units / 500 mL
Heparin concentration (units/mL) = 40 units/mL
Infusion rate: 25 mL/hour (given)
Time: 12 hours (given)
We need to find the total number of heparin units delivered in 12 hours.
Total volume delivered in 12 hours:
Volume delivered (mL/hour) x Time (hours) = Total volume delivered (mL)
25 mL/hour x 12 hours = 300 mL
Total heparin units delivered:
Heparin concentration (units/mL) x Total volume delivered (mL) = Total heparin units
40 units/mL x 300 mL = 12,000 units
Therefore, the client will receive 12,000 units of heparin in 12 hours.
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