Advance IV Therapy Module Example 1

1 1 advance iv therapy module example 1 A patient is to receive Lidocaine at 3mg/min. Supplied is a one liter bag of D5W containing Lidocaine 4g. Calculate the infusion rate in mL/hr. First, identify the doctor s order. Doctor s order = min3mg This is also known as the dose. Second, identify the dose on hand (DOH). Dose on hand = mLg10004 Supplied is Lidocaine 4g in a one liter (1000mL) bag of D5W. This can be written as mLg10004. Now solve for the infusion rate in mL/hr using dimensional analysis. Doctor s order Conversion DOH Conversion Wanted Quantity min3mg x mgg10001 x gmL41000 x hr1min60 = 45 The infusion rate would be 45mL/hr. Remember to set up your problem so that the proper units cancel.

2 2 Example 2 A diabetic is to receive an infusion of insulin at 12 units/hr. The nurse prepares a 250mL bag of NS with 100 units of regular insulin. What is the infusion rate in mL/hr? First, identify the doctor s order. Doctor s order = hrunits12 This is also known as the dose. Second, identify the dose on hand (DOH). Dose on hand = mLunits250100 Supplied is 100 units of regular insulin in a 250mL bag of NS. This can be written as mLunits250100. Now solve for the infusion rate in mL/hr using dimensional analysis. Doctor s order DOH Wanted Quantity hrunits12 x unitsmL100250 = 30 The infusion rate would be 30mL/hr. Remember to set up your problem so that the proper units cancel.

3 3 Example 3 The doctor orders Heparin at 1800 units/hr. Available is 25,000 units in 250mL of solution. Calculate the infusion rate in mL/hr. First, identify the doctor s order. Doctor s order = hrunits1800 This is also known as the dose. Second, identify the dose on hand (DOH). Dose on hand = mLunits250000,25 Supplied is 25,000 units in 250mL of solution. This can be written as mLunits250000,25. Now solve for the infusion rate in mL/hr using dimensional analysis. Doctor s order DOH Wanted Quantity hrunits1800 x unitsmL000,25250 = 18 The infusion rate would be 18mL/hr. Remember to set up your problem so that the proper units cancel. 4 Calculating a dose based on weight.

4 Example 4 The doctor orders Nipride 3mcg/kg/min to keep SBP < 140mmHg. The pharmacy supplies this in a 250mL bag of D5W that contains 50mg of the drug. The patient weighs 56kg. Compute the dosage in mcg/min and the infusion rate in mL/hr. First, identify the doctor s order. Doctor s order = min3kgmcg The doctor s order is given as 3mcg/kg/min. This can be written as min3kgmcg. Second, identify the dose on hand (DOH). Dose on hand = mLmg25050 Supplied is a 250mL bag of D5W that contains 50mg of the drug. This can be written as mLmg25050. Third, identify the patient s weight. Patient s weight = 156kg The patient s weight given is 56kg. This can be written as 156kg. Now let s first solve for mcg/min using dimensional analysis.

5 Doctor s order Patient s weight Wanted Quantity min3kgmcg x 156kg = min168mcg The dose for this patient would be 168mcg/min. Remember to set up your problem so that the proper units cancel. 5 Now that you know the dose for the patient, calculate the infusion rate in mL/hr using dimensional analysis. Patient s dose Conversion DOH Conversion Wanted Quantity min1168mcg x mcgmg10001 x mgmL50250 x hr1min60 = = 50 hrmL The infusion rate would be 50 mL/hr. Remember to set up your problem so that the proper units cancel. To check your answer, back solve. You can do this by first solving for mg/hr using the dose calculated for the patient.

6 Dose Conversion Conversion = Wanted Quantity min1168mcg x mcgmg10001 x hr1min60 = hrmg = 10 hrmg Using the dose for the patient based on their weight, they should receive 10 mg/hr. To finish back solving, solve for mg/hr using the calculated infusion rate and the DOH. DOH Infusion Rate = Wanted Quantity mLmg25050 x hrmL50 = 10hrmg Using the DOH and the infusion, the patient should receive 10 mg/hr. Since both answers are equal to each other, your calculation is correct. 6 Example 5 A patient weighing 252 pounds is to begin an infusion of dopamine at 5mcg/kg/min. The drug is supplied in a 250mL bag of NS that contains 400mg.

7 What is the dosage in mcg/min and the infusion rate in mL/hr? First, identify the doctor s order. Doctor s order = min5kgmcg The doctor s order is given as 5mcg/kg/min. This can be written as min5kgmcg. Second, identify the dose on hand (DOH). Dose on hand = mLmg250400 Supplied is a 250mL bag of NS that contains 400mg. This can be written as mLmg250400. Third, identify the patient s weight. Patient s weight = 1252lb The patient s weight given is 252lb. This can be written as 1252lb. Let s first convert the patient s weight from pounds to kilograms. Patient s weight Conversion Wanted Quantity 1252lb x = kg Now let s solve for mcg/min using dimensional analysis.

8 Doctor s order Patient s weight Wanted Quantity min5kgmcg x = = 573minmcg 7 The dose for this patient would be 573 mcg/min. Remember to set up your problem so that the proper units cancel. Now that you know the dose for the patient, calculate the infusion rate in mL/hr using dimensional analysis. Patient s dose Conversion DOH Conversion Wanted Quantity min573mcg x mcgmg10001 x mgmL400250 x hr1min60 = 21 hrmL The infusion rate would be 21 mL/hr. Remember to set up your problem so that the proper units cancel. To check your answer, back solve. You can do this by first solving for mg/hr using the dose calculated for the patient.

9 Dose Conversion Conversion = Wanted Quantity min573mcg x mcgmg10001 x hr1min60 = hrmg = 34 hrmg Using the dose for the patient based on their weight, they should receive 34 mg/hr. To finish back solving, solve for mg/hr using the calculated infusion rate and the DOH. DOH Infusion Rate = Wanted Quantity mLmg250400 x hrmL21 = hrmg = 34 hrmg Using the DOH and the infusion, the patient should receive 34 mg/hr. Since both answers are equal to each other, your calculation is correct. 8 Example 6 A patient weighing 98 kg is to receive an infusion of dobutamine at 5mcg/kg/min. Available is 500mg in 250mL of solution. What is the dosage in mcg/min and the infusion rate in mL/hr?

10 First, identify the doctor s order. Doctor s order = min5kgmcg The doctor s order is given as 5mcg/kg/min. This can be written as min5kgmcg. Second, identify the dose on hand (DOH). Dose on hand = mLmg250500 Supplied is 500mg in 250mL of solution. This can be written as mLmg250500. Third, identify the patient s weight. Patient s weight = 198kg The patient s weight given is 98kg. This can be written as 198kg. Now let s first solve for mcg/min using dimensional analysis. Doctor s order Patient s weight Wanted Quantity min5kgmcg x 198kg = min490mcg The dose for this patient would be 490mcg/min. Remember to set up your problem so that the proper units cancel.