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Specialties Calculators

Specialties Calculators

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Gas Cookbook is a quick reference for UK healthcare professionals. Recipes are example plans and calculators reproduce published formulas; check every dose against the BNF and your local protocols and adapt to the patient in front of you. Our liability is limited as set out in the Terms; nothing excludes liability that cannot be excluded by law. Read the full disclaimer.

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Gas Cookbook | Laparotomy (Small Bowel Obstruction)

Laparotomy (Small Bowel Obstruction)

Laparotomy (Small Bowel Obstruction)

GA · 2–3 h

Calculate NELA Score +/- ACS NSQIP Risk
Confirm clotting + valid G&S
Consider pre-oxygenation strategy (e.g. anticipated difficult airway / high BMI)

NeuraxialCSE

Spinal: 0.5% bupivacaine + 8% glucose2.2ml + morphine0.2mg

Check for contraindications of neuraxial block

Pre-Induction

ProcedureArterial Line
ProcedureRyles Tube + Suction
Consider cricoid pressure

Drugs (RSI)

fentanyl150mcg
propofol2.5mg/kg
rocuronium1.2mg/kg
metaraminolAs required

Other

AirwayETT

Post-Induction

ProcedureCentral Venous Catheter Line

Maintenance

propofolTCI
remifentanilTCI

Infusions

metaraminol0.5mg/ml

Analgesia

morphine0.1mg/kg
magnesium sulphate5g
clonidine15mcg/ml, 0.5-1mcg/kg
paracetamol1g

Analgesia (if NBM)

morphinePCA
Paracetamol1g
Local anaesthetic infusion via epidural / rectus sheath catheters (if appropriate)

Anti-emetics

ondansetron4mg
cyclizine50mg

Details

Specialty: General Surgery
Author: Gas Cookbook
Airway: ETT
Block: Rectus Sheath
Procedure: Arterial Line Central Venous Catheter Line Epidural NG Tube Spinal
Technique: IV Induction

Example plan written by a clinician, not medical advice. Check every dose against the BNF and your local protocols and adapt to the patient in front of you. You remain responsible for every clinical decision. Disclaimer · Report an error

Related

Perianal Abscess I&DGeneral Surgery · GA · LMA · Volatile · 30 min
Laparoscopic AppendicectomyGeneral Surgery · GA · ETT · RSI · 2 h
Robotic Colorectal Cancer Anterior ResectionGeneral Surgery · GA · ETT · Arterial Line · Central Venous Catheter Line · 3–6 h

diclofenac

75mg

Local anaesthetic infiltration by surgical team

Anti-emetics

ondansetron4mg
dexamethasone6.6mg

Other

Antibiotics as required

Updated

Jun 2026