Samantha Hudson a two-year-old child in the ER with parents at the bedside. She came in not feeling well, irritable, crying all night, and not eating or drinking. Orders: Vistaril 15 mg IM q4h, Stat x 1 for nausea.
Available: Vistaril 50 mg/ml
How many mL will you administer to Samantha now?
1 mL
0.5 mL
0.3 mL
0.2 mL
The Correct Answer is C
Given:
Desired dose of Vistaril: 15 mg
Concentration of Vistaril: 50 mg/mL
Step 1: Set up the proportion:
Desired dose (mg) / Volume to administer (mL) = Concentration (mg/mL)
Step 2: Substitute the values:
15 mg / Volume = 50 mg/mL
Step 3: Solve for the unknown volume:
Volume = 15 mg / 50 mg/mL
Step 4: Calculate the volume:
Volume = 0.3 mL
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A) They should not be abruptly stopped:
Beta blockers should not be abruptly discontinued because sudden withdrawal can lead to rebound hypertension, tachycardia, and even a risk of acute myocardial infarction (MI) in patients with heart disease. Gradual tapering is recommended to allow the body to adjust and avoid these adverse effects.
B) They are safe to take with herbal medications:
Herbal medications can interact with beta blockers and alter their effectiveness or increase the risk of side effects. For example, herbs like St. John's wort can decrease the effectiveness of beta blockers, while others like ginseng may increase the risk of side effects like high blood pressure. It is important to consult with a healthcare provider before taking any herbal supplements with beta blockers.
C) It isn't necessary to monitor lab results:
While beta blockers don't require regular lab tests for their direct effects, monitoring is important in certain patients, especially those with underlying conditions like heart failure, kidney disease, or diabetes. For example, monitoring renal function, electrolytes, and blood glucose may be necessary for patients who are taking other medications alongside beta blockers or who have coexisting conditions.
D) Taking over-the-counter medications is acceptable:
Many over-the-counter (OTC) medications can interact with beta blockers and affect their effectiveness or cause adverse effects. For example, decongestants (found in many cold medications) can raise blood pressure and counteract the effects of beta blockers.
Correct Answer is D
Explanation
Given:
Ordered dose of antibiotic: 250 mg
Vial contains: 250 mg of antibiotic
Reconstitution volume: 1.7 mL of sterile water
Final volume after reconstitution: 2 mL
Step 1: Determine the concentration of the reconstituted solution:
Concentration (mg/mL) = Total amount of drug (mg) / Total volume (mL)
Concentration (mg/mL) = 250 mg / 2 mL
Concentration (mg/mL) = 125 mg/mL
Step 2: Calculate the volume to be administered:
Volume (mL) = Ordered dose (mg) / Concentration (mg/mL)
Volume (mL) = 250 mg / 125 mg/mL
Volume (mL) = 2 mL
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