Which one of the following devices relies on gravity to infuse the solution?
PCA device
infusion pump
syringe pump
rate controller
The Correct Answer is D
A. PCA device: A patient-controlled analgesia (PCA) device uses programmed electronic controls to deliver medication, not gravity, to ensure precise dosing and timing.
B. infusion pump: An infusion pump actively controls and delivers fluids at a set rate using mechanical force, independent of gravity.
C. syringe pump: Syringe pumps use motorized pressure to deliver fluids in small volumes over time and do not depend on gravitational flow.
D. rate controller: A rate controller works with gravity by regulating the flow of IV fluid from the bag into the patient using a dial or clamp but does not apply mechanical force itself.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is ["2"]
Explanation
Desired dose = 400 mg.
- Determine the available concentration.
A 20% solution = 20 g per 100 mL = 20,000 mg per 100 mL
So the concentration is:
20,000mg/100mL
=200mg/mL
- Calculate the volume to administer per dose.
Volume (mL) = Desired dose (mg) / Concentration (mg/mL)
= 400 mg / 200 mg/mL
= 2 mL.
Correct Answer is B
Explanation
A. 6:00 p.m.: This time is 12 hours after the last dose was administered. The medication order specifies a frequency of "q6h," which means the medication can be given every six hours. A twelve-hour interval is twice as long as the prescribed time.
B. 12:00 noon: To determine the next possible dose time, you must add 6 hours to the time of the last dose. The last dose was given at 0600 (6:00 a.m.), and adding 6 hours results in 1200 (12:00 noon) as the earliest possible time for the next dose.
C. 3:00 p.m.: This time is 9 hours after the last dose was administered. The prescribed frequency of "q6h" indicates that the medication can be given at an interval of 6 hours. Waiting 9 hours would not be in compliance with the medication order.
D. 9:00 a.m.: This time is only 3 hours after the last dose was administered. The medication order of "q6h" requires a minimum of 6 hours to pass between doses. Administering the medication at 9:00 a.m. would violate the prescribed frequency.
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