The healthcare provider orders Valium 8 mg IV now. The concentration available is 5 mg/mL. How many mL will the patient receive?
1.4 mL
1.8 mL
1.2 mL
1.6 mL
The Correct Answer is D
Choice A reason: To calculate the volume, divide the ordered dose (8 mg) by the concentration (5 mg/mL): 8 ÷ 5 = 1.6 mL. Choice A (1.4 mL) underestimates the volume, delivering only 7 mg (1.4 × 5), which is insufficient for the prescribed dose, making it incorrect for accurate medication administration.
Choice B reason: Calculating 8 mg ÷ 5 mg/mL yields 1.6 mL. Choice B (1.8 mL) would deliver 9 mg (1.8 × 5), exceeding the ordered dose. This overdose could increase the risk of sedation or respiratory depression, as Valium (diazepam) is a benzodiazepine with potent CNS effects, making this choice incorrect.
Choice C reason: The correct volume is 8 mg ÷ 5 mg/mL = 1.6 mL. Choice C (1.2 mL) delivers only 6 mg (1.2 × 5), which is below the prescribed dose. This underdose could result in inadequate therapeutic effects, such as insufficient anxiety relief or seizure control, making it an incorrect choice.
Choice D reason: Dividing the ordered dose (8 mg) by the concentration (5 mg/mL) gives 8 ÷ 5 = 1.6 mL. This volume accurately delivers the prescribed 8 mg of Valium, ensuring therapeutic efficacy for conditions like anxiety or seizures while minimizing risks of over- or under-dosing, making it the correct choice.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A reason: Questioning why allergies aren’t aren’t in the chart is secondary and confrontational. Clarifying the specific allergy ensures safety, so this is incorrect for the first action.
Choice B reason: Identifying the specific antibiotic and reaction verifies the allergy, preventing anaphylaxis or harm. This is the priority safety step, making it the correct first action.
Choice C reason: Lowering the dose doesn’t address the allergy risk; allergic reactions can occur regardless. Verifying the allergy is critical first, so this is incorrect.
Choice D reason: An antihistamine may mitigate mild reactions but doesn’t confirm the allergy. Clarifying the allergy prevents unsafe administration, so this is incorrect for the first step.
Correct Answer is A
Explanation
Choice A reason: Drug-receptor binding either activates (agonists) or inhibits (antagonists) receptor activity, altering physiological responses. This is the primary effect, making it the correct choice for receptor interaction.
Choice B reason: Drugs do not permanently alter receptors non-responsive; they modulate activity temporarily. Non-responsiveness may occur with chronic use, but it’s not the primary effect, so this is incorrect.
Choice C reason: Preventing receptor action is specific to antagonists, not all drugs. drugs bind to receptors. Binding broadly affects activity, so this is incorrect for the general effect of receptor binding.
Choice D reason: Drugs do not give receptors new functions; they enhance or block existing ones. ones. Activity modulation is the key effect, making this incorrect for what occurs during binding.
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