A nurse is preparing to administer lidocaine via continuous IV infusion at 4 mg/min. Available is lidocaine 2 g dextrose 5% in water 500 mL. The nurse should set the IV pump to deliver how many mL/hr? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)
The Correct Answer is ["60"]
Calculation:
- Determine the concentration of the available solution in mg/mL.
Total drug amount: 2 g
Total volume: 500 mL
- Convert grams (g) to milligrams (mg): 2 g × 1000 mg/g
= 2000 mg
Available concentration (mg/mL) = 2000 mg/500 mL
= 4 mg/mL.
- Calculate the infusion rate in milliliters per minute (mL/min).
Desired rate: 4 mg/min
Available concentration: 4 mg/mL
Rate (mL/min) = Desired rate (mg/min) / Available concentration (mg/mL)
= 4 mg/min/4 mg/mL
= 1 mL/min.
- Convert the rate from milliliters per minute (mL/min) to milliliters per hour (mL/hr).
Rate (mL/hr) = Rate (mL/min) ×60 min/hr
= 1 mL/min×60 min/hr
= 60 mL/hr.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. Loss of consciousness: Adenosine can cause transient lightheadedness or dizziness, but complete loss of consciousness is not an expected effect during administration. Any syncope would be brief and uncommon.
B. Conversion of atrial fibrillation: Adenosine is effective for terminating paroxysmal supraventricular tachycardia (PSVT) but does not convert atrial fibrillation or atrial flutter. Its action is specific to AV node–dependent reentrant tachycardias.
C. Increased heart rate: Adenosine typically slows conduction through the AV node and may transiently slow the heart rate. An increase in heart rate is not an expected pharmacologic effect.
D. A period of asystole: Adenosine briefly blocks AV nodal conduction, which can result in a transient period of asystole lasting a few seconds. This effect is anticipated and resolves quickly, restoring normal sinus rhythm in PSVT.
Correct Answer is B
Explanation
A. Increased calcium level: Furosemide is a loop diuretic that promotes the excretion of electrolytes, including calcium. An increased calcium level would not indicate a therapeutic response and may suggest another metabolic issue.
B. Decreased urine specific gravity: Furosemide increases urine output by inhibiting sodium and water reabsorption in the loop of Henle. A decreased urine specific gravity reflects more dilute urine, which indicates effective diuresis and a therapeutic response.
C. Decreased liver enzymes: Furosemide does not have a direct effect on liver enzyme levels. Changes in liver enzymes would not reflect the effectiveness of the diuretic therapy.
D. Increased serum sodium level: Loop diuretics like furosemide can lead to sodium loss rather than an increase. An elevated serum sodium level would not indicate a therapeutic effect of the medication.
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