Question

20). A physician orders 4 L intravenous fluids for a dehydrated patient to be administered over a period of 24 hours using an intravenous set that delivers 15 drops/mL. Calculate the drip rate in a) drops per minute and in b) milliliters per hours.

22). A physician orders a 2-g vial of a drug to be added to 500 mL. of D5W. If the administration rate is 125 mL/h, how many milligrams of the drug will a patient receive per minute?

24). A physician orders 35 mg of amphotericin B and 24 units of heparin to be administered intravenously in 1000mL of D5W over an 8-hour period. In filling the nedication order, the available sources of the additives are a vial containing 50 mg of amphotericin B in 10 mL and a syringe containing 10 units of heparin per milliliter. a). How many milliliters of each additive should be used in filling the medication oredr? b). How many milliliters of the intravenous fluid per minute should the patient receive?

Answer 1

a) number of drops/ml =15 drop/ml, total volume= 4L= 4000ml. So number of drops= 15*4000 drops=60000drops

this drops are to be spread obver a period of 24 hours. Hence drop rate = 60000/24*60 drops/min=41.7 drop/min

b) total volume= 4000ml =4000*10³ ml , this has to be adminsitered for 24 hours, hence drop rate= 4000*10³/24 m/hr=166666.67 ml/hr

2.

Rate of administration =125 ml/hr

Concentration of drug= 2/500 g/ml= 2000mg/500= 4 mg/ml

Hence mg of drug patient received = 4mg/ml*125 ml/hr= 500mg/hr= 500/60 mg/min=8.33 mg/min

3.

Vial has got 50mg/10ml =5 mg/ml of amphotericin B

10 ml contains 50mg

35 mg is required for (35/50)*10ml= 7ml

10units of heparin is thee in 1 ml

Required heparin= 24 units. Hence volume required = 2.4 ml

Required volume = 1000 ml/8 hr = 2.08ml/min