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Zorluk: ZorPharmacological Therapies

A 6-year-old6\text{-year-old} client weighing 55 lb55\text{ lb} is admitted to the pediatric unit with a soft tissue infection. The client's vital signs are temperature 100.8∘F100.8^\circ\text{F} (38.2∘C38.2^\circ\text{C}), heart rate 110 beats/min110\text{ beats/min}, and blood pressure 98/64 mm Hg98/64\text{ mm Hg}. The client has no known drug allergies. The healthcare provider prescribes oral cephalexin 25 mg/kg/day25\text{ mg/kg/day} divided into two equal doses every 12 hours12\text{ hours}. The medication available is cephalexin oral suspension 250 mg/5 mL250\text{ mg}/5\text{ mL}. How many mL\text{mL} should the practical nurse administer per dose? (Record answer to the nearest tenth. Do not include units in answer.)

Cevap: 6.3 mL

Cevap

6.3
To safely administer this medication, the nurse must accurately compute a multi-step calculation. First, convert the child's weight to kilograms (55 lb÷2.2=25 kg55\text{ lb} \div 2.2 = 25\text{ kg}). Next, determine the total daily dose by multiplying the weight by the prescribed rate (25 kg×25 mg/kg=625 mg/day25\text{ kg} \times 25\text{ mg/kg} = 625\text{ mg/day}). Because the medication is divided into two equal doses given every 12 hours12\text{ hours}, divide the daily dose by 2 (625 mg÷2=312.5 mg/dose625\text{ mg} \div 2 = 312.5\text{ mg/dose}). Using dimensional analysis or the ratio-proportion method with the available concentration of 250 mg250\text{ mg} in 5 mL5\text{ mL}, the volume is calculated: (312.5 mg÷250 mg)×5 mL=6.25 mL(312.5\text{ mg} \div 250\text{ mg}) \times 5\text{ mL} = 6.25\text{ mL}. Following the instruction to record the answer to the nearest tenth, 6.256.25 rounds up to 6.36.3.

Adım Adım Çözüm

1
Convert weight from pounds to kilograms.
25 kg25\text{ kg}
Pediatric weight-based dosages are calculated using metric weight.
2
Calculate the total daily dose prescribed.
625 mg/day625\text{ mg/day}
The prescription is for 25 mg/kg/day25\text{ mg/kg/day}.
3
Calculate the individual dose amount.
312.5 mg/dose312.5\text{ mg/dose}
The daily dose is divided into two equal doses given every 12 hours.
4
Calculate the volume needed per dose.
6.25 mL6.25\text{ mL}
The medication concentration is 250 mg250\text{ mg} per 5 mL5\text{ mL}.
5
Round the final volume to the nearest tenth.
6.3
Standard rounding rules dictate that a hundredths digit of 5 rounds the tenths digit up.

Anahtar Kavram

Pediatric Weight-Based Dosage Calculation
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