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Week 8 Pharmacology
Week 8 Pharmacology Calculating Infusion Rates for Medications in Critical Care
| Question | Answer |
|---|---|
| For example, a prescriber orders heparin 2,500 units/hr, which is available in a solution that contains 15,000 units of heparin in 300 mL of dextrose 5% in water (D5W). How many milliliters per hour should the nurse infuse? | 15,000 units / 300mL = 50 units/mL |
| Which three variables must be considered when calculating the rate of infusion of a critical care medication? | 1. Volume to be administered 2. Concentration of medication 3. Unit of time over which the volume is to be infused. |
| What is calculated first when calculating the infusion rate of a critical care medication in solution on the basis of total dosage per hour? | Dose of medication per mL |
| The healthcare provider prescribes 400 mcg of Precedex in 100 mL of normal saline (NS) to infuse at 18 mcg/hr. Based on this, the nurse should set the infusion pump for mL/hr. | 400mcg /100mL = 4mcg/mmL ...... 18 mcg/ 4 mcg /mL = 4.5 mL/hr |
| The medication order is for Lidocaine 8 mg in 250 mL, to infuse at 10 mcg/min. Based on this, the nurse has to infuse at the rate of mL/hr (rounded to the nearest tenth). | 8 mg / 250 mL = 0.032 mg =32 mcg......... 10 mcg/min / 32 mcg/mL = 0.3125 mL/min x 60 min = 18.75 =18.8 mL/hr |
| A patient who weighs 165 lb is prescribed a critical care medication, 500 mg in 500 mL D5W at 5 mcg/kg/min. Place, in the correct order, the steps for calculating the infusion rate in mL/hr for this patient. | 1. Calculate the concentration of medication in 1 mL of solution. 2. Convert pounds to kilograms. 3. Calculate the concentration to be infused per minute. 4. Divide the concentration per minute by the concentration of the solution. 5. Multiply mL/ |
| A patient weighing 154 lb is prescribed a critical care medication, 375 mg in 250 mL D5W at 5 mcg/kg/min. The infusion pump should be set at mL/hr (rounded to the nearest whole number). | 375 mg /250 mL =1.5 mg/ mL.... 1.5 mg x 1,000 mcg = 1500mcg... 154 lbs / 2.2 lbs = 70kg ..... 70 kg x 5 mcg/kg/min = 350 mcg/min.... 350 mcg/min /1,500 mcg/mL =0.233 mL/min ...... 60 min = 1 hour...0.233 mL x 60 min = 13.98 = 14 mL/hr |
| The healthcare provider prescribes a critical care medication, 500 mg in 500 mL D5W at 5 mcg/kg/min, for a patient weighing 165 lb. Based on this, the nurse should set the infusion pump at mL/hr. | 165 lb / 2.2 lbs = 75 kg...... 500 mg /500 mL = 1mg/mL......1 mg = 1,000 mcg.... 75 kg x 5 mcg/kg/min = 375 mcg/min.... 375 mcg/min /1,000 mcg/mL = 0.375 mL/min.... 0.375 mL x 60 min = 22.5 mL/hr |
| The healthcare provider prescribes a heparin infusion for the patient at 30 mL/hr. Available is 30,000 units of heparin with a concentration of 1,000 mL of D5W. Based on this, the patient will receive ___ units/hr. | 30,000 units x 30 mL/hr = 900,000 units /1,000 hr = 900 units/hr |
| The healthcare provider orders 1,000 units per hour of heparin. The concentration of the heparin that is available is 20,000 units per 500 mL of D5W. Based on this, the flow rate should be mL/hr. | 500 mL / 20,000 units x 1,000units = 25 mL/hr |
| The healthcare provider prescribes 800 units of heparin per hour. The concentration that is available is 40,000 units per 1,000 mL of D5NS. If this heparin is infused using an intravenous pump, the flow rate would be mL/hr. | 1,000 mL / 40,000 units x 800 units = 20 mL/hr |
| The healthcare provider prescribes 20 units/kg/hr of heparin for a patient who weighs 132 lb. The patient will receive units/hr. | 132 lb /2.2 lbs = 60 kg x 20 units = 1200 units/kg/hr |
| The healthcare provider prescribes 30 units of regular insulin per hour of IV. Available is 130 units of regular insulin in 250 mL NS. The patient will receive _______ mL/hr (rounded to the nearest tenth). | 130 units / 250 mL = 0.52 units .... 30 units / 0.52 units = 57.69 = 57.7 mL/hr |
| The healthcare provider prescribes 900 mg of amiodarone in 500 mL D5W to infuse at 0.5 mg/min. Based on this, the patient will receive ____ mL/hr. | 900 mg / 500 mL = 1.8 mg/mL .....0.5mg/min / 1.8 mg/mL = 0.27 mL/min ... 0.27 mL/1 min x 60 minutes/1 hr =16.7 mL/hr |
| The medication order is for administering a continuous infusion of Lidocaine at 2 mg/min/infusion pump. Available is IV of 500 mL D5W with 2 g Lidocaine added. Based on this, the hourly rate for the infusion pump should be mL/hr. | 2 g / 500 mL =0.004 g/mL .....2mg / 4mg/mL =0.5 mL/min ..... 0.5 mL x 60 min = 30 mL/hr |
| The healthcare provider prescribes 50 mg of a nitroglycerine in 250 mL D5W to infuse at 10 mcg/min for chest pain. The patient will receive mL/hr. | 50mg /250mL = 0.2 mg/mL..... 0.2 mg = 200mcg (converting) .... 10 mcg/min / 200mcg/mL = 0.05 mL/min... 0.05 mL x 60 min = 3 mL/hr |
| The healthcare provider prescribes dopamine 400 mg in 250 mL D5W at 5 mcg/kg/min. The patient’s current weight is 220 lb. Based on this, the patient should receive ___ mL/hr (rounded to the nearest tenth). | 400mg / 250 mL =1.6 mg/mL...(convert) 1mg = 1,000 mcg....1.6 x 1,000 = 1,600 mg/mL.... 220lb /2.2 lb =100 kg.... 100 kg x 5 mcg/kg/min = 500 mcg /min ..... 500mcg/min / 600 mcg/mL = 0.312 mL/min.... 60 min x 0.312 mL = 18.75 mL= 18.8 mL/hr |
| A patient weighing 165 lb is prescribed a critical care medication, 250 mg in 300 mL D5W at 3 mcg/kg/min. The electronic infusion pump should be set at mL/hr. | 165 lb /2.2 lb = 75 kg.......250mg / 300 mL= 0.833 mg/mL ..... (convert ) 0.833 mg = 833 mg/mL.... 75 kg x 3 mcg/kg/min = 225 mcg/min.... 225 mcg /833 mcg/mL = 0.27 mL/min ..... 60 min /1 hr 0.27 mL / 1 min * 60 min = 16.2 mL/hr |
| The healthcare provider prescribes 50 mL of heparin each hour. Available is 1,000 mL with 10,000 units of heparin added. Based on this, the patient will receive ___ units/hr. Use numbers only. | 10, 000 / 1,000 mL x 50 mL = 500,000 units / 1,000 hr = 500 units/hr |
| The healthcare provider prescribes 1,000 units of heparin per hour. Available is 12,500 units of heparin per 250 mL in D5W. The patient will receive mL/hr. | 250 mL / 12,500 units x 1, 000 = 20mL/hr |
| The nurse is providing care to a patient who is prescribed 10 units of regular insulin per hour by intravenous infusion. The concentration of insulin that is available is 125 units per 250 mL of NS. Based on this, the patient will receive ___ mL/hr. | 125 units / 250 mL = 0.5 units/mL .... 10 units/1 hr x 0.5 units = 5 mL/hr |
| A 220-lb patient is prescribed a critical care medication, 300 mg in 500 mL D5W at 5 mcg/kg/min. The electronic infusion pump should be set at ____ mL/hr (rounded to the nearest whole number). | 220 lb / 2.2 lb = 100 kg... 300 mg / 500 mL =0.6 mg/mL ....0.6 x 1000= 600 mcg ...100 kg x 5 mcg/kg/min = 500 mcg/min ...../ 600 mcg/mL = 0.833 mL /min 0.833 mL x 60 min = 49.98 = 50 mL/hr |
| The healthcare provider prescribes heparin IV at 10 units/kg/hr for a patient weighing 165 lb. The available concentration is 12,500 units in 250 mL of D5W. The patient will receive __ mL/hr. | 165 lb / 2.2 lb = 75 kg ..... 10 units x 75 kg = 750 units/hr.... 250 mL / 12,500 x 750 units = 15 mL/hr |
Created by:
Brandi Sizemore
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