HESI: Dosage Calculations Assignment Quiz 2024

1. Heparin protocol is prescribed for a client weighing 90 kg. Per protocol, the heparin loading dose is 60 units/kg IV rounded to the nearest 100 units, with a maximum loading dose of 4,000 units. The heparin vial is labeled 5,000 units/ml. How many ml should the nurse administer? (Enter the numeric value only. If rounding is required, round to the nearest tenth.) false Item 51164 By Sheila Duncan Heparin Protocol: Heparin loading dose: 60 units/kg IV, rounded to the nearest 100 units, followed by a maintenance infusion of 12 units/kg/hr, rounded to the nearest 100 units/hr. The maximum bolus is 4,000 units and the maximum initial infusion is 1000 units/hr. Determine the client loading dose: 60 units x 90 kg = 5,400 unit. Per protocol, use the maximum loading dose of 4,000 units, and calculate the client's dose using the formula D/H x Q = 4,000 units / 5,000 units x 1 ml = 4/5 = 0.8 ml or Use ratio and proportion: 5,000 : 1 ml :: 4,000 : X X = 0.8 ml 2. A child weighing 28.4 kg is in hypertensive crisis. The healthcare provider prescibes methyldopa (Aldomet) 40 mg/kg/day IV in 4 divided doses. The pharmacy provides a 50 mg/ml injection vial. How many ml should the nurse administer? (Enter numeric value only. If rounding is required, round to the nearest tenth.) First calculate the total mg dose/day: 40 mg x 28.4 kg = 1136 mg/day Next divide the total mg into the 4 dosages for the day: 1136 mg/4 doses = 284 mg/dose Using the Desired/Have formula: 284 mg/50mg x 1 ml = 5.68 ml/ dose, rounded to 5.7 ml. 3. A client with multiple sclerosis and muscle spasms receives a prescription for baclofen (Kemstro) 30 mg PO daily. The medication is supplied from the pharmacy in 20 mg scored tablets. How many tablets should the nurse administer? (Enter numeric value only. If rounding is required, round to the nearest tenth.) Use ratio and proportion, 30 mg : X tablets = 20 mg : 1 tablet 20X = 30 X = 1.5 4. A client with dehydration receives a prescription for an IV of Lactated Ringer's 1,000 ml to be administered over 8 hours. The nurse should program the infusion pump to deliver how many ml/hour? (Enter numeric value only, using whole number.) Use the ratio of: 1000 ml : 8 hours :: X : 1 hour 1000/X :: 8/1 X = 125 ml/hour 5. The nurse plans to administer labetalol hydrochloride (Trandate) 0.3 grams PO to a client with hypertension. Trandate is available in 200 mg scored tablets. How many tablets should the nurse administer? (Enter numeric value only.) First convert grams to milligrams using the known conversion: 1 gram = 1000 mg. 0.1 gram = 100 mg as 0.3 gram = 300 mg Next using the formula, Desired/Available x 1 tablet = 300 mg/200 mg x 1 = 1.5 tablets 6. A 110-pound, adult female is admitted to the Emergency Center after receiving burns to 40 percent of her body. Using the Parkland formula, the client's fluid requirements for the first 24 hours after injury is calculated using Lactated Ringer's 4 ml solution x Body weight (in kilograms) x Percent burn. The client should receive one-half of the 24-hour calculated fluid volume in the first 8 hours of treatment. The nurse should set the infusion pump to deliver how many ml/hour during the first 8 hours? (Enter the numerical value only. If rounding is required, round to the nearest whole number.) Using the Parkland formula, the client's fluid requirements for the first 24 hours after injury is calculated using 4 ml lactated Ringer's solution x Body weight (in kilograms) x Percent burn Convert 110 pounds to kg = 110 / 2.2 = 50 kg 4 ml x 50 kg x 40 = 8,000 ml One-half in first 8 hours = 4,000 ml 4,000 ml / 8 hours = 500 = 500 ml/hour 7. A client who has heart failure with paroxysmal atrial tachycardia is receiving digoxin (Lanoxin) 0.45 mg IV as the inital digitalizing dose. The pharmacy provides 0.25 mg/ml. How many ml should the nurse administer? (Enter numeric value only. If rounding is required, round to the nearest tenth.) Using the formula D/H x Q = 0.45 mg/0.25 mg x 1 mL = 1.8 ml 8. Mineral oil U.S.P 30 ml PO daily for 3 days is prescribed for a client who is experiencing severe constipation. The dose cup is marked in tablespoons. How many tablespoons should the nurse administer? (Enter numeric value only.) 15 ml equals 1 Tablespoon. Use the ratio equation: 15 ml : 1 Tbs :: 30 ml : X 15 / 30 :: 1 / X 15X = 30 X = 2 Tablespoons 9. A client is receiving an IV solution of 2 grams of medication diluted in 100 ml of normal saline over a one hour time period. How many mg of medication is the client receiving per minute? (Enter numeric value only. If rounding is required, round to the nearest whole number.) 2 grams = 2000 mg 1 hour = 60 minutes 2000 mg/60 minutes = 33.333 mg/minute, rounded to 33 mg/minute 10. Oxytocin (Pitocin) 4 milliunits/minute IV is prescribed for a client with an ineffective contraction pattern. To administer the prescribed dosage, the nurse adds 20 units of oxytocin to Ringer's Lactate 1,000 ml . The infusion pump should be set to deliver how many ml/hour. (Enter numeric value only.) 4 milliunits/min x 1 unit/1000 milliunits x 1000 ml/20 units x 60 min/hr = 240,000/20,000 = 12 ml/hour