A nurse starts an infusion of 1500 mL of normal saline (NS) for a client at 8:45 am at a flow rate of 2 mL/min. The tubing drop factor is 10 drops/mL.
Calculate the volume of fluid that will be left at 10:00 am.
1236 mL
1250 mL
1336 mL
1350 mL
The Correct Answer is D
To find the volume of fluid that will be left at 10:00 am, you need to calculate the following:
- The time elapsed in minutes from 8:45 am to 10:00 am using the formula: Time elapsed (min) = End time (min) - Start time (min)
- The volume of fluid infused in milliliters (mL) during the time elapsed using the formula: Volume infused (mL) = Flow rate (mL/min) x Time elapsed (min)
- The volume of fluid left in milliliters (mL) at 10:00 am using the formula: Volume left (mL) = Initial volume (mL) - Volume infused (mL)
First, use the formula for time elapsed to find how many minutes have passed from 8:45 am to 10:00 am:
Time elapsed (min) = End time (min) - Start time (min)
Since the end time is 10:00 am and the start time is 8:45 am, plug in these values into the formula:
Time elapsed (min) = 600 min - 525 min
Simplify and solve for the time elapsed:
Time elapsed (min) = 75 min
Next, use the formula for volume infused to find the amount of fluid infused in milliliters during the time elapsed:
Volume infused (mL) = Flow rate (mL/min) x Time elapsed (min)
Since the flow rate is 2 mL/min and the time elapsed is 75 min, plug in these values into the formula:
Volume infused (mL) = 2 mL/min x 75 min
Simplify and solve for the volume infused:
Volume infused (mL) = 150 mL
Then, use the formula for volume left to find the amount of fluid left in milliliters at 10:00 am:
Volume left (mL) = Initial volume (mL) - Volume infused (mL)
Since the initial volume is 1500 mL and the volume infused is 150 mL, plug in these values into the formula:
Volume left (mL) = 1500 mL - 150 mL
Simplify and solve for the volume left:
Volume left (mL) = 1350 mL
Therefore, the volume of fluid that will be left at 10:00 am is **1350 mL**.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
To find the amount of solution to draw for one dose, you need to calculate the following:
- The body surface area (BSA) of the client in square meters (m²) using the formula: BSA (m²) = √(Height (cm) x Weight (kg) / 3600)
- The dose of allopurinol in milligrams (mg) using the formula: Dose (mg) = BSA (m²) x Prescribed dose
(mg/m²)
- The volume of solution in milliliters (mL) using the formula: Volume (mL) = Dose (mg) / Concentration (mg/mL)
First, use the formula for BSA to find the client's body surface area in square meters:
BSA (m²) = √(Height (cm) x Weight (kg) / 3600)
Since the client's height is 148 cm and weight is 55 kg, plug in these values into the formula:
BSA (m²) = √(148 cm x 55 kg / 3600)
Simplify and solve for the BSA:
BSA (m²) = 1.41 m²
Next, use the formula for dose to find the amount of allopurinol in milligrams:
Dose (mg) = BSA (m²) x Prescribed dose (mg/m²)
Since the client's BSA is 1.41 m² and the prescribed dose is 115 mg/m², plug in these values into the formula:
Dose (mg) = 1.41 m² x 115 mg/m²
Simplify and solve for the dose:
Dose (mg) = 162.15 mg
Then, use the formula for volume to find the amount of solution in milliliters:
Volume (mL) = Dose (mg) / Concentration (mg/mL)
Since the dose is 162.15 mg and the concentration is 25 mg/mL, plug in these values into the formula:
Volume (mL) = 162.15 mg / 25 mg/mL
Simplify and solve for the volume:
Volume (mL) = 6.486 mL
Therefore, the nurse should draw **6.486 mL** of solution for one dose of allopurinol.
Correct Answer is C
Explanation
the correct rate to administer the maintenance dose is 50 mL/hr.
Step 1: Determine the concentration of magnesium sulfate in the solution.
- There are 40 grams of magnesium sulfate in 1 liter of solution.
- 1 liter = 1000 mL.
Step 2: Calculate the concentration in grams per mL.
- 40 grams ÷ 1000 mL = 0.04 grams per mL.
- Result: 0.04 grams per mL.
Step 3: Determine the required dose per hour.
- The physician ordered 2 grams per hour.
Step 4: Calculate the volume of solution needed to provide 2 grams of magnesium sulfate.
- Required dose (2 grams) ÷ concentration (0.04 grams per mL) = volume in mL.
- 2 grams ÷ 0.04 grams per mL = 50 mL.
- Result: 50 mL.
- The calculated rate is 50 mL/hr.
the correct rate to administer the maintenance dose is 50 mL/hr.
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