Body-Weight Based Calculator

Paediatric calculator for anaesthesia
from Paedicalc.org

Enter BW: kg    
Enter Age:

AIRWAY & IVF

ETT size:__
ETT depth:__
LMA size:
IVF maintenance (4-2-1):__ml/h
IVF bolus (20ml/kg):__ml

INTRAOPERATIVE

Propofol (3mg/kg): ___ mg
Atracurium (0.5mg/kg): ___ mg
Fentanyl (1-2mcg/kg): ___ to ___ mcg
Morphine (0.1mg/kg): ___ mg
Paracetamol IV () ___ mg slow infusion
Paracetamol PR (30mg/kg) ___ mg
Ondansetron (0.1mg/kg) ___ mg
Neostigmine (50mcg/kg) ___ mg

HAEMAT

Blood volume (70ml/kg) = __ml
PRBC (4ml/kg) = __ml
(↑ 1g/dL)
PRBC (10ml/kg) = __ml
(↑ 2.5g/dL)
Platelets (10ml/kg) = __ml
FFP (15ml/kg) = __ml

EMERGENCIES

Atropine (20mcg/kg): ___ mg
Suxamethonium (1.5mg/kg): ___ mg
Adrenaline (10mcg/kg):
for cardiac arrest
__ mcg i.e. __ ml  (1:10,000)
Adrenaline (1mcg/kg):
for anaphylaxis, initial dose IV
__ mcg i.e. __ ml  (1:10,000)
Sync.Cardioversion (0.5→1→2J/kg): ______J
Defibrillation (2-4J/kg): __ to __J

OTHER DRUGS

Cardiac & Resuscitation
ATP (0.167mg/kg): __ mg
Amiodarone (5mg/kg): __ mg
Hydrocortisone (2-4mg/kg): __ to __mg
Salbutamol IV 5-10 mcg/kg/min for 1h
then 1-2 mcg/kg/min
10mg diluted up to 50ml NS (200mcg/ml)
Intralipid 20% (1.5ml/kg): __ ml over 1 min
Dantrolene (2.5mg/kg): __ mg
Metabolic & Electrolytes
Calcium gluconate 10% (0.3ml/kg): __ml slow IV
Magnesium (25-50mg/kg): __ to __mg over 20mins
approx. __ to __ ml (0.05-0.1ml/kg) of standard preparation (49.3%≈2mmol/ml)
Dextrose (D10W) (2ml/kg): __ ml
for hypoglycaemia; make D10W by diluting 10ml D50W in water make up to 50ml
DI drip
(0.1unit/kg insulin + D50W 2ml/kg):
__U insulin +
__ml D50W over 20mins
NaHCO3 8.4% (1ml/kg): __ml slow IV
Reversal agents
Naloxone (4mcg/kg, repeat as necessary): __mcg initial dose, slow IV
Flumazenil (10mcg/kg): __
Neuro
Mannitol 20%
(0.25-0.5g/kg=1.25-2.5ml/kg)
__ to __ml over 30mins
Lorazepam (0.1mg/kg): __ mg
Midazolam (0.1-0.2mg/kg) IV or IM: __ to __ mg
Phenytoin (20mg/kg): __mg over 20mins

VASOPRESSOR

Dopamine Preparation: 200mg in 5ml (40mg/ml)
Dosage: __ mg [BW(kg)x3] dilute up to 50ml NS/D5
Dilution: Add __ ml NEAT drug to __ ml NS/D5
Infuse at: 1-20 mcg/kg/min = 1-20 ml/h
Dobutamine Preparation: 250mg in 20ml (12.5mg/ml)
Dosage: __ mg [BW(kg)x3] dilute up to 50ml NS/D5
Dilution: Add __ ml NEAT drug to __ ml NS/D5
Infuse at: 1-20 mcg/kg/min = 1-20 ml/h
Adrenaline Preparation: 1:10,000 (0.1mg/ml)
Dosage: __ dilute up to 50ml NS/D5
Dilution: Add __ ml NEAT drug to __ ml NS/D5
Infuse at: 0.05-1 mcg/kg/min = 1-20 ml/h
Noradrenaline Preparation: 4mg in 4ml (1mg/ml)
Dosage: __ dilute up to 50ml NS/D5
Dilution: Add __ ml NEAT drug to __ ml NS/D5
Infuse at: 0.05-1 mcg/kg/min = 1-20 ml/h
Phenylephrine Preparation: 10mg in 1ml (10mg/ml)
Dilution: Dilute phenylephrine to 10mcg/ml  i.e. 10 times more dilute than standard adult dilution of 100mcg/ml
Bolus dose:
(1-2mcg/kg)
__ to __ mcg
= __ to __ml (Conc.=10mcg/ml)

MAX DOSE OF LOCAL ANAESTHETIC

Lignocaine without adrenaline (max 4mg/kg) ___ mg
Lignocaine with adrenaline (max 7mg/kg) ___ mg
(Levo)bupivacaine (max 2mg/kg) ___ mg

SPECIFIC ASPECTS

Pulse check:
Child: Carotid or femoral pulse
Infants: Brachial pulse
Compression-ventilation ratio:
30:2 for 1 rescuer
15:2 for 2 rescuers
Compression depth:
Child: 1/3 AP diameter of chest / 5cm
Infants: 1/3 AP diameter of chest / 4cm
Hand placement:
Child: 2 hands at lower half of sternum
Infants: 2 thumb-encircling hands at centre of chest
During CPR: Push hard and fast (100-120/min), allow full chest recoil, minimize interruptions, avoid hyperventilation, rotate compressor every 2 minutes
Intraoperative arrest: FiO2 to 100%, discontinue anaesthetics, stop surgical stimulus. If patient is already intubated: continue compressions at 100-120/min, give 1 breath every 6 sec
Reversible causes: Hypovolemia, hypoxia, hydrogen ion, hypoglycemia, hypo or hyperK+, hypothermia, tension pneumothorax, cardiac tamponade, pulmonary thromboembolism, coronary thrombosis, toxins

Paediatric Calculator for Anaesthesia () / Paedicalc.org
Website designed by Terence Luk.
This work is licensed under a Creative Commons BY-NC 4.0 License.
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Disclaimer: The use of the application ("app") is for reference only; the accuracy of the contents cannot be guaranteed. Administer medications with care and according to clinical need. The author does not accept responsibility or liability for any errors in the information provided or for the misuse or misapplication of material in this app.