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1Formulas and methods
Pediatric nursing
Method
Note the child’s age first: it sets the normal vital signs, the milestones and the right pain scale.
Assess airway, breathing and circulation, remembering that children compensate and then deteriorate fast.
Match the action to the development stage and involve the family.
Check that the answer is safe for a child: weight-based, no aspirin in viral illness, no codeine under 12.
Pediatric & critical-care dosing
Daily dose
mg/day = mg/kg/day × weight (kg)
Doses per day
number = 24 h / dosing interval (h)
Pounds to kilograms
kg = lb / 2.2
Infusion concentration
units/mL = units in bag / bag volume
Pump rate
mL/h = dose per hour / concentration
Titrated drip
mL/h = mcg/kg/min × kg × 60 / (mcg/mL)
Dose from pump rate
mcg/kg/min = mL/h × (mcg/mL) / (60 × kg)
Units
1 mg = 1000 mcg
IV fluids & fluid balance
Holliday–Segar per hour
4 mL/kg (first 10 kg) + 2 mL/kg (next 10 kg) + 1 mL/kg (each kg above 20)
Holliday–Segar per day
100 / 50 / 20 mL/kg for the same bands
Fluid balance
intake − output
Ice chips
count as half their volume
Urine output
mL/kg/h = mL / (kg × h)
Infusion time
time (h) = volume left (mL) / rate (mL/h)
Volume infused
mL = rate × time
2Practice problems
1.Pediatric nursingMedium
Which finding suggests developmental dysplasia of the hip in an infant?
ABowed legs in a toddler
BAsymmetric skin folds of the thighs or buttocks and limited hip abduction
CA barking cough
DEqual leg length, symmetrical skin folds and full, easy abduction of both hips
2.Pediatric nursingHard
The nurse has taught the parents of a child with epilepsy. Which statement shows a need for further teaching?
A"When the jerking stops, I'll turn him onto his side."
B"I'll time the seizure and give the rescue medicine if it lasts too long."
C"I'll put a spoon in his mouth so he doesn't bite or swallow his tongue."
D"I'll move hard objects away and put something soft under his head."
3.Pediatric & critical-care dosingMedium
Practice exercise (made-up values, not clinical guidance). An infusion of 250 units of regular insulin in 250 mL runs at 10 mL/h. How many units per hour D does the patient receive?
250 units/250 mL10 mL/h
D = units/h
4.Pediatric & critical-care dosingHard
Practice exercise (made-up values, not clinical guidance). A dobutamine infusion of 250 mg in 250 mL runs at 14 mL/h. The patient weighs 92 kg. What dose D in mcg/kg/min is the patient receiving? Round to one decimal place.
250 mg/250 mL14 mL/h92 kg
D = mcg/kg/min
5.IV fluids & fluid balanceMedium
Practice exercise (made-up values, not clinical guidance). The record shows a patient's intake and output for one 8-hour shift. The patient weighs 69 kg. Find the average urine output U in mL/kg/h. Round to two decimal places.
Practice exercise (made-up values, not clinical guidance). A 1000 mL bag was started at 13:45 and runs by pump at 125 mL/h. How many mL V are left in the bag at 16:45?
1000 mL125 mL/h13:45 → 16:45
V = mL
3Solutions
1.Pediatric nursing
Answer: B · Asymmetric skin folds of the thighs or buttocks and limited hip abduction
Why this is the answer
Signs include asymmetric skin folds, limited abduction, an apparently shorter leg and positive Ortolani or Barlow tests. Treatment in infancy often uses a Pavlik harness.
Answer
B · Asymmetric skin folds of the thighs or buttocks and limited hip abduction
2.Pediatric nursing
Answer: C · "I'll put a spoon in his mouth so he doesn't bite or swallow his tongue."
Why this is the answer
Putting objects in the mouth can break teeth, injure the mouth or block the airway; the tongue cannot be swallowed. Timing the seizure, protecting from injury and placing the child on the side afterwards are correct.
Answer
C · "I'll put a spoon in his mouth so he doesn't bite or swallow his tongue."
3.Pediatric & critical-care dosing
Answer: D = 10 units/h
Heparin and insulin infusions: concentration = units in the bag/bag volume (units/mL). Pump rate (mL/h) = units per hour/concentration, and units per hour = mL/h × concentration. For a weight-based order, units/h = units/kg/h × weight first. A bolus volume = units needed/vial strength. The numbers are for practice only; at the bedside always follow local protocols and have high-risk doses double-checked.
Concentration
250/250 = 1 units/mL
Units per hour
D = 10·1 = 10 units/h
Answer
D = 10 units/h
4.Pediatric & critical-care dosing
Answer: D = 2.5 mcg/kg/min
Titrated drips: first find the concentration in mcg/mL (mg × 1000/mL). For a weight-based order, mcg/min = mcg/kg/min × weight. Then mL/h = mcg/min × 60/concentration. Working backwards, mcg/kg/min = mL/h × concentration/(60 × weight). The numbers are for practice only; at the bedside always follow local protocols and have high-risk doses double-checked.
Concentration
250 000/250 = 1000 mcg/mL
Micrograms per minute
14·1000 = 14000 mcg/h
14000/60 = 233.3 mcg/min
Per kilogram
D = 233.3/92 = 2.536 ≈ 2.5 mcg/kg/min
Answer
D = 2.5 mcg/kg/min
5.IV fluids & fluid balance
Answer: U = 2.99 mL/kg/h
Intake and output: intake counts everything that goes in (oral fluids, IV infusions, IV medications and flushes, tube feeds); ice chips count as half their volume. Output counts urine, drains, vomit and other losses. Balance = total intake − total output; a negative balance is a net loss. The numbers are for practice only; at the bedside always follow local protocols and have high-risk doses double-checked.
Total urine
500 + 375 + 500 + 275 = 1650 mL
Per kilogram per hour
U = 1650/(69·8) = 2.989 ≈ 2.99 mL/kg/h
Answer
U = 2.99 mL/kg/h
6.IV fluids & fluid balance
Answer: V = 625 mL
Infusion time: time (h) = volume to infuse (mL)/rate (mL/h); use the volume still left in the bag, not the bag size. Volume infused = rate × time. Convert decimal hours to hours and minutes with the fraction × 60 (0.5 h = 30 min, not 50 min). The numbers are for practice only; at the bedside always follow local protocols and have high-risk doses double-checked.