ICU/Critical Care Nutrition Guide

Metabolic Response to Critical Illness Hypermetabolic

Ebb Phase (0–24 hrs post-injury)

Reduced metabolic rate, hypothermia possible, decreased cardiac output. Body conserves energy — aggressive feeding may be harmful in this phase.

Flow Phase (Days 1–7+)

Hypermetabolism, catecholamine surge, glucocorticoid elevation. Muscle protein catabolism accelerates — up to 1–2% lean body mass lost per day in ICU.

Key Metabolic Alterations

Insulin resistance — hyperglycaemia common even without pre-existing diabetes; tight glycaemic control (6–10 mmol/L) associated with improved outcomes
Muscle catabolism — protein breakdown exceeds synthesis; amino acids used for gluconeogenesis and acute-phase protein synthesis
Increased energy expenditure — fever increases REE by ~10% per 1°C rise; sepsis, trauma, burns dramatically elevate needs
Gut barrier dysfunction — bacterial translocation risk increases without enteral stimulation; early EN preserves gut mucosa integrity
Altered micronutrient status — selenium, zinc, vitamin C, vitamin D commonly depleted in critically ill

Malnutrition in ICU

Prevalence: 40–60% of ICU Patients

Associated with higher mortality, prolonged ventilation, increased infection rates, impaired wound healing
Protein-energy malnutrition independently increases ICU LOS by 2–4 days
Pre-ICU malnutrition (frailty, cancer, chronic disease) compounds in-ICU losses

GLIM Criteria (ICU Application)

Phenotypic: weight loss >5% in 6 months, low BMI, reduced muscle mass
Aetiologic: reduced food intake/assimilation OR inflammation/disease burden
Diagnosis requires ≥1 phenotypic + ≥1 aetiologic criterion
Severity graded as moderate or severe based on degree of phenotypic criteria

ICU Nutrition Nurse Role

Initiate nutrition within 24–48 hrs of admission per protocol
Ensure correct tube placement verification before each feed
Monitor tolerance: GRV, GI symptoms, blood glucose
Recognise and escalate complications (aspiration, refeeding syndrome)
Liaise with dietitian/physician for formula changes or PN switch
Document intake accurately — identify cumulative caloric deficit early
Wean EN appropriately when oral intake resumes

Nutritional Assessment in ICU

Screening Tools

NRS-2002 (Nutritional Risk Screening)

Score ≥3 = at nutritional risk → nutrition support required
ICU patients: disease severity score automatically ≥3 (score +3 for ICU/APACHE ≥10)
Components: nutritional status impairment (0–3) + disease severity (0–3) + age >70yrs (+1)

NUTRIC Score (ICU-Specific)

Variables: age, APACHE II, SOFA, comorbidities, days from hospital to ICU, IL-6 (if available)
Score ≥5 (without IL-6) = high nutritional risk → most likely to benefit from aggressive nutrition

Energy Requirements

Gold Standard: Indirect Calorimetry

Measures VO₂ and VCO₂ to calculate true REE. Respiratory Quotient (RQ) also guides macronutrient balance. Available in tertiary GCC ICUs — preferred when accessible.

Predictive Equations (When IC Unavailable)

Acute phase (days 1–3): 15–20 kcal/kg/day (permissive underfeeding)
Recovery phase: 25–30 kcal/kg/day actual BW
Protein: 1.2–2.0 g/kg/day (higher in burns, trauma, multi-organ failure)
Burns: up to 3.0 g/kg protein/day
Use IBW if BMI >30; use adjusted BW if oedematous

ESPEN/ASPEN ICU Guidelines 2023 – Key Points

Early EN

Start within 24–48 hrs if haemodynamically stable. Not on escalating vasopressors.

Protein First

Prioritise protein delivery. Caloric restriction may be acceptable early; protein restriction is not.

Avoid Overfeeding

Overfeeding worsens outcomes. Hyperglycaemia, hepatic steatosis, hypercapnia risks.

Micronutrients

High-dose antioxidants (Se, Zn, Vit C, E) not routinely recommended outside deficiency states.

PN Timing

Do not initiate PN within first 7 days in low-risk patients if EN feasible. Early PN only if high nutritional risk and EN impossible.

Monitoring

Regular reassessment. Adjust targets as patient condition changes — acute vs recovery phase differ substantially.

ICU Calorie & Protein Calculator Interactive

Weight (kg)

Height (cm)

Age (years)

Sex

Admission Diagnosis

ICU Phase

BMI

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kg/m²

Caloric Target

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kcal / day

Protein Target

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g / day

Formula Volume

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mL/day (1 kcal/mL feed)

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When to Start Enteral Nutrition

Early EN: Within 24–48 Hours of ICU Admission

Patient is haemodynamically stable (MAP ≥65 mmHg on stable/decreasing vasopressors)
GI tract is accessible and not obstructed
Benefits: preserves gut mucosal integrity, reduces bacterial translocation, modulates inflammatory response

Do NOT Start / Delay EN When:

Escalating vasopressor doses (noradrenaline >0.25 mcg/kg/min and increasing)
Uncontrolled haemorrhagic shock
Unresuscitated bowel ischaemia or acute abdomen
Active upper GI bleeding (until controlled)
High-output proximal GI fistula not bypassed

Trophic / Permissive Underfeeding (Early Phase)

Start at 10–20 mL/hr → titrate to target over 48–72 hrs. Full caloric delivery not required in days 1–3. Prioritise protein delivery and gut tolerance assessment.

Gastric vs Post-Pyloric Feeding

Gastric (First-Line)

NG or OG tube — easier to place, no special skills required
Mimics physiological route — stimulates GI hormones, bile flow, pancreatic secretion
Monitor GRV every 4–6 hrs in acute phase

Post-Pyloric / Small Bowel (When Indicated)

Indications: GRV consistently >200–500 mL, recurrent aspiration, gastroparesis, pancreatitis
NJ (naso-jejunal) or PEJ (percutaneous endoscopic jejunostomy)
Does NOT eliminate aspiration risk — microaspiration of oropharyngeal secretions continues
Continuous infusion required (no bolus for jejunal feeding)

HOB Positioning

Head of Bed 30–45° During ALL Enteral Feeding

Reduces aspiration pneumonia risk. Document in nursing notes. If patient requires flat positioning (e.g., skin graft dressing, spinal precautions), use continuous subglottic suction and consider post-pyloric route.

Feeding Tube Types & Selection

Tube Type	Duration	Indication	Key Considerations
NG (Naso-Gastric)	Short-term (<4 wks)	Gastric feeding, ICU standard	Verify by pH + X-ray initially; pH <5.5 for ongoing checks
OG (Oro-Gastric)	Short-term	Facial trauma, basal skull fracture	Preferred over NG when NG contraindicated
NJ (Naso-Jejunal)	Short-term (<4 wks)	Post-pyloric feeding — aspiration risk, gastroparesis	Requires fluoroscopy or bedside technique; continuous infusion only
PEG (Percutaneous Endoscopic Gastrostomy)	Long-term (>4 wks)	Prolonged EN need (stroke, neurological)	Endoscopy required; stoma care protocol; not for acute ICU use
PEJ (Percutaneous Endoscopic Jejunostomy)	Long-term (>4 wks)	Long-term post-pyloric feeding	Complex placement; continuous infusion; jejunal stoma care
Surgical Jejunostomy	Long-term	Post-oesophageal or gastric surgery	Placed intraoperatively; earliest post-operative EN route

Position Verification Protocol

Initial placement: ALWAYS confirm by chest X-ray — gold standard for new NG/OG tubes
Ongoing checks: pH aspirate testing before each feed, after position changes, after vomiting/coughing episodes
Gastric pH target: <5.5 (may be higher if on PPI/H2 blocker — pH 5.5–6.0 acceptable if on acid suppression)
NEVER use auscultation alone — "whoosh" test is unreliable and UNSAFE
Mark tube at nostril insertion length — document and check at every assessment
If unable to aspirate or pH unclear → hold feed, request X-ray before resuming

GRV (Gastric Residual Volume) Management

Monitoring Protocol

Check GRV every 4–6 hrs during acute phase
Using 60 mL syringe — aspirate, measure, return residual to patient (reduces electrolyte loss)
GRV alone is a poor predictor of aspiration — use with clinical assessment

Action Thresholds

GRV 200–500 mL: Hold feed 1 hr, reassess, consider prokinetics — resume if reduced
GRV >500 mL (×2 consecutive): Hold EN, escalate to physician/dietitian — consider post-pyloric route
Document all GRV values and actions in nursing notes

Prokinetics for High GRV

Metoclopramide 10 mg IV/PO TDS — first-line; monitor for extrapyramidal effects
Erythromycin 3 mg/kg IV TDS (short courses) — more potent prokinetic; antibiotic stewardship consideration; tachyphylaxis after 3–5 days
Combination therapy may be used for refractory gastroparesis

EN Nursing Checklist Saved Locally

Standard Polymeric Formulas

Formula Type	Energy Density	Osmolality	Fibre	Use Case
Standard 1.0 kcal/mL	1.0 kcal/mL	~300 mOsm/kg	With/without fibre options	General ICU, first-line for most patients
High Energy 1.5 kcal/mL	1.5 kcal/mL	~500–600 mOsm/kg	Usually fibre-containing	Fluid-restricted patients, unable to tolerate large volumes
High Energy 2.0 kcal/mL	2.0 kcal/mL	~700–900 mOsm/kg	Low fibre	Fluid-restricted (acute renal failure, cardiac); high osmolality → diarrhoea risk — use cautiously
High Protein (20%+ kcal from protein)	1.0–1.5 kcal/mL	Variable	With/without	Critical illness, post-surgical, ICU patients with protein requirements >1.5 g/kg/day

Water Flush Protocol

Flush with 30–50 mL sterile water every 4 hrs during continuous feeding
Flush before and after each medication administration
Flush before and after GRV checks
Use sterile water in ICU (not tap water) — immunocompromised patients at risk from tap water pathogens
Document all flushes in fluid balance chart — flushes count towards daily fluid intake

Disease-Specific Formulas

Renal Formulas (e.g., Nepro, Suplena, Renilon)

Restricted phosphate, potassium, magnesium
Lower protein (pre-dialysis) OR higher protein (on dialysis/CRRT)
High energy density (1.8–2.0 kcal/mL) for fluid restriction
CRRT patients lose amino acids via effluent — protein requirements increase to 1.7–2.5 g/kg/day
Monitor phosphate, potassium, urea daily

Hepatic Formulas (e.g., Heparon, NutriComp Hepa)

Enriched with branched-chain amino acids (BCAA: leucine, isoleucine, valine)
Reduced aromatic amino acids — reduces hepatic encephalopathy risk
Not routinely used — reserve for overt hepatic encephalopathy unresponsive to standard protein
Standard EN protein restriction no longer recommended for most liver disease

Diabetic Formulas (e.g., Glucerna, Diason)

Lower glycaemic index carbohydrate sources (fructose, modified starch)
Higher fat proportion (up to 50% energy from fat)
Fibre-enriched — slows glucose absorption
Modest blood glucose improvement vs standard — insulin management remains primary intervention

Pulmonary Formulas (e.g., Pulmocare, Respalor)

High fat (55% energy) / low carbohydrate (28%) to reduce CO₂ production
Reduces RQ — theoretically reduces ventilator weaning difficulty
Evidence weak — current guidelines do not routinely recommend; avoid overfeeding instead
High osmolality and high fat content may increase GI intolerance

Immunonutrition Formulas (e.g., Impact, Crucial, Reconvan)

Contain pharmacological doses of: glutamine (gut mucosal fuel), arginine (immune function, wound healing), omega-3 fatty acids (anti-inflammatory), nucleotides
ESPEN 2023: Immunonutrition recommended for elective GI surgery and trauma patients — evidence supports faster recovery, reduced infections
Arginine-containing formulas: use with caution in sepsis — may worsen haemodynamics via nitric oxide pathway
Glutamine supplementation: NOT routinely recommended in ICU (REDOX/METAPLUS trials showed potential harm in multi-organ failure)

Protein-Enriched Formulas for Sarcopenia / Frailty

Protein modules (Protifar, ProMod) can supplement standard formulas to boost protein without increasing caloric load
Consider for sarcopenic obese patients — need high protein (2.0–2.5 g/kg IBW) but caloric restriction
Whey protein preferred over casein for leucine content and muscle protein synthesis stimulation

Formula Quick-Reference by Condition

Condition	First-Line Formula	Protein Target	Special Considerations
General ICU / Sepsis	Standard polymeric 1.0–1.5 kcal/mL	1.3–1.8 g/kg/day	Early EN within 24–48 hrs; avoid immunonutrition in septic shock
Acute Kidney Injury (no dialysis)	Renal formula (Nepro/Suplena)	1.0–1.2 g/kg/day	Monitor electrolytes daily; avoid excess potassium/phosphate
AKI on CRRT	High-protein renal formula	1.7–2.5 g/kg/day	Amino acid losses via effluent; extra protein supplementation often needed
Liver Failure / HE	Standard (first); hepatic if refractory HE	1.2–1.5 g/kg/day	Do NOT restrict protein routinely; BCAA formula only if standard fails
Burns (>20% BSA)	High-protein formula; immunonutrition	2.0–3.0 g/kg/day	Highest protein needs in ICU; Curreri formula or indirect calorimetry preferred
Pancreatitis (severe)	Polymeric NJ/jejunal feeding	1.2–1.5 g/kg/day	Jejunal EN preferred over gastric; PN only if jejunal EN not tolerated
Obesity (BMI >35)	High-protein, hypocaloric	2.0–2.5 g/kg IBW	11–14 kcal/kg actual BW; preserve lean mass while creating caloric deficit

Indications for Parenteral Nutrition

Absolute Indications (EN Not Possible)

Bowel obstruction (mechanical or functional)
Paralytic ileus not resolving within 3–5 days
Short bowel syndrome with <100 cm functional small bowel
High-output proximal GI fistula (>500 mL/day not amenable to distal feeding)
Severe acute pancreatitis with jejunal EN failed/not accessible
Severe malabsorption (intestinal failure)

ESPEN 2023 Timing Guidance

Low nutritional risk: Start PN after day 7 if EN fails/not possible
High nutritional risk (NUTRIC ≥5 or NRS ≥5): Start PN within 3–7 days if EN impossible
Supplemental PN (EN + PN): consider if EN provides <60% of target after 3–5 days

Central vs Peripheral PN

Central PN (via CVC / PICC)

Required for hyperosmolar solutions (>900 mOsm/L) — standard ICU PN
Allows full caloric delivery in small volumes (1.5–2.0 L/day)
CVC tip must be in SVC/RA junction — confirm by X-ray before use
Dedicated PN lumen — no other medications or blood draws via PN line
Highest infection risk of all IV therapies — strict aseptic technique mandatory

Peripheral PN (via Peripheral IV / PICC)

Maximum osmolality: 900 mOsm/L to reduce thrombophlebitis risk
Lower caloric density — requires higher volumes (2.5–3.5 L/day)
Short-term use only (3–5 days maximum) — vein preservation critical
Inspect insertion site every 4–8 hrs for phlebitis signs
Change peripheral site every 72–96 hrs per protocol

PN Components & Compounding

Macronutrient Components

Glucose (dextrose): Primary caloric substrate; 50–70% of non-protein calories; max infusion rate 4–5 mg/kg/min; excess → hyperglycaemia, hepatic steatosis, CO₂ overproduction
Lipids (IVFE): 15–40% of total calories; soy-based or mixed (olive/MCT/fish oil); max 1.5 g/kg/day; infuse over 12–24 hrs; fish oil-enriched IVFE may reduce inflammation
Amino acids: Standard solutions 10–15%; disease-specific (renal, hepatic, branched-chain enriched) available; glutamine-supplemented PN bags NOT routinely recommended

Micronutrients & Additives

Multi-vitamin preparations (fat + water soluble) daily
Trace elements (zinc, selenium, copper, manganese, chromium)
Electrolytes adjusted daily: Na, K, Mg, Ca, Phosphate
Insulin can be added to PN bag or given separately (separate preferred for dose adjustment)

Bag Types

3-in-1 (All-in-One / TNA)

Glucose + amino acids + lipid combined in single bag. Prepared by pharmacy. Reduces handling and infection risk. Standard in GCC major hospitals. Shelf-stable 24–48 hrs once mixed.

2-in-1

Glucose + amino acids only; lipid infused separately via Y-connector. Allows independent lipid dose adjustment. More complex setup. Same aseptic standards apply.

GCC Compounding Practice

Most tertiary hospitals (MOH/PSMMC/Hamad/Cleveland Clinic Abu Dhabi): pharmacy-prepared standardised bags. Smaller hospitals: pre-made commercial multi-chamber bags (Olimel, Smofkabiven, Kabiven). Bedside mixing: NOT recommended — stability and sterility risk.

PN Administration & Rate Titration

Start at 50% of target rate for first 24 hrs — monitor glucose response
Titrate to full rate over 24–48 hrs
Never abruptly stop PN (rebound hypoglycaemia) — taper over 1–2 hrs or give 10% dextrose
Change PN bag every 24 hrs maximum — document hang time
Use infusion pump — never gravity drip
Dedicated PN lumen — label clearly
Filter use: 1.2 micron in-line filter for 3-in-1; 0.22 micron for 2-in-1 (no lipid)
Protect from light — cover bag with opaque sleeve (lipid photo-oxidation)

Refeeding Syndrome Prevention

High-Risk Patients

BMI <16 or weight loss >15% in 6 months
Negligible intake >10 days
Chronic alcoholism, anorexia nervosa
Prolonged IV fluids without nutrition

Prevention Protocol (NICE Guidelines)

Start at max 10 kcal/kg/day for first 2 days → gradually increase over 4–7 days
Check phosphate, potassium, magnesium before starting nutrition and daily for first week
Replace electrolytes proactively — do not wait for deficiency to develop
IV thiamine (Vitamin B1) 100 mg daily before and for 3–5 days after starting PN
Monitor cardiac rhythm — hypokalaemia/hypomagnesaemia cause arrhythmias

PN Monitoring Schedule

Parameter	Frequency	Target / Action
Blood glucose	Every 1–4 hrs (ICU)	6–10 mmol/L; insulin sliding scale; avoid hypoglycaemia <4.4 mmol/L
Electrolytes (Na, K, Cl, HCO₃)	Daily	Adjust PN composition daily based on results
Phosphate, Magnesium, Calcium	Daily (first week)	Critical in refeeding risk — replace aggressively if low
Urea, Creatinine	Daily	Assess protein tolerance; adjust amino acid dose in renal failure
LFTs (ALT, AST, ALP, Bilirubin)	2×/week initially; weekly	Rising LFTs = PN-associated liver disease → reduce lipid, consider cycling
Triglycerides	2–3× per week	Target <4.5 mmol/L; hold lipid if >5.0 mmol/L
Trace elements, vitamins	Weekly	Selenium, zinc, copper if prolonged PN (>2 weeks)
CVC site inspection	Every nursing shift	Redness, swelling, discharge, fever → CRBSI protocol; cultures + line change
Fluid balance	Hourly / Daily total	PN contributes significantly to daily fluid intake — document precisely

Enteral Nutrition Complications

Aspiration

Prevention: HOB 30–45°; verify tube position; monitor GRV; oral care every 2–4 hrs; ETT cuff pressure 20–30 cmH₂O
Blue dye test: ABANDONED — unreliable, risk of absorption and sepsis
Continuous subglottic secretion drainage (CSSD) reduces VAP risk
Aspiration pneumonitis: gastric acid damage; aspiration pneumonia: bacterial infection
Action: hold EN, suction airway, inform physician, consider post-pyloric route

Diarrhoea

Formula-related: high osmolality, rapid rate increase → reduce rate, switch to lower osmolality formula
Infectious: C. difficile — send stool culture, isolate patient, contact precautions, metronidazole/vancomycin
Medication-related: sorbitol-containing liquid medications (sorbitol acts as osmotic laxative), antibiotics (gut flora disruption)
Management: fibre-enriched formula (soluble fibre), probiotics (evidence emerging), assess medication list
Define diarrhoea: ≥3 liquid stools/day or >250 mL/day; document Bristol stool chart

Constipation

No stool >3 days in ICU patients — common (opioids, immobility, dehydration)
Add fibre-enriched formula (soluble + insoluble fibre)
Ensure adequate free water flushes (>500 mL/day above formula)
Bowel regimen: lactulose, senna, sodium docusate per protocol
Methylnaltrexone (Relistor) for opioid-induced constipation unresponsive to standard laxatives

Tube Blockage

Prevention: flush 30–50 mL water every 4 hrs and around medications
Management: flush with warm water (30–50 mL) using push-pull technique
Pancreatic enzyme preparation (Viokace/Creon crushed in sodium bicarbonate solution) — enzyme activation technique
Do NOT use cola/carbonated beverages — ineffective and potentially harmful
If tube uncleared after 3 attempts → replace tube

Tube Dislodgement / Migration

Check external tube length mark every shift and after any event (coughing, vomiting, repositioning)
If mark changed: HOLD FEED immediately — do not resume without position reconfirmation
Secure tube to nose/cheek with dedicated dressing; reapply if loose
For confused/agitated patients: consider mittens or soft wrist restraints per protocol

Parenteral Nutrition Complications

CRBSI (Catheter-Related Bloodstream Infection)

Most serious PN complication — mortality 10–25%
Fever + rigors during/after PN infusion → suspect CRBSI
Action: take 2 sets blood cultures (peripheral + central), do not remove line immediately unless unstable
Prevention: maximal sterile barrier precautions at insertion; chlorhexidine-impregnated dressings; dedicated PN lumen; daily dressing inspection; hand hygiene

Hyperglycaemia

Most common PN complication in ICU
Glucose load in PN + insulin resistance of critical illness
Target: 6–10 mmol/L in ICU (NICE-SUGAR trial)
Insulin sliding scale or fixed-rate insulin infusion; add insulin to PN bag carefully (adsorption to PVC — use 80% of calculated dose when adding to bag)

PN-Associated Liver Disease (PNALD)

Rising LFTs, fatty liver (hepatic steatosis) → cholestasis in prolonged PN
Reduce total caloric load; switch to lipid emulsion with lower omega-6 (olive or fish oil based)
Cycle PN (10–12 hrs/day) if clinically feasible
Introduce EN as soon as possible — best prevention for PNALD
Ursodeoxycholic acid may be used for cholestasis

Electrolyte Disturbances

Hyponatraemia: excess free water in PN; adjust sodium content
Hypokalaemia: inadequate K+ in PN; add KCl to PN bag (max 40 mmol/L via peripheral)
Hypophosphataemia: refeeding syndrome marker — replace IV before and during PN
Hypertriglyceridaemia: excessive or rapid lipid infusion; reduce rate or hold IVFE

ICU Feeding Interruption Management

Common Interruption Causes

Surgical/procedural fasting — minimise to 4 hrs pre-procedure when possible; resume immediately post-procedure
Diagnostic procedures (CT, endoscopy) — coordinate timing, document cumulative deficit
High GRV or feeding intolerance — address cause; do not simply omit feeding
Extubation — brief interruption; resume oral diet or restart EN based on swallow assessment
Transport outside ICU — pause feeding during transport; resume on return

Prone Positioning & EN

Continue EN during prone positioning — evidence supports safety
Gastric EN preferred; aspirate GRV before proning
Reduce rate by 20–25% during prone positioning if GRV high
Resume full rate 1 hr after returning to supine
Post-pyloric EN particularly useful in prone patients with high GRV

Medication-EN Interactions

Phenytoin: hold EN 1 hr before and after — EN reduces absorption by up to 70%
Warfarin: monitor INR closely — vitamin K content of EN formulas affects anticoagulation
Ciprofloxacin (oral/NG): hold EN 1 hr before and after — divalent cations chelate fluoroquinolones
Always flush tube before and after medications; use liquid formulations where possible

Daily Nutrition Monitoring Checklist Saved Locally

GCC ICU Nutrition Practice Landscape

Inconsistent Practice Across GCC

Major tertiary hospitals (King Fahad Medical City, King Abdulaziz Medical Center, Hamad Medical Corporation, Cleveland Clinic Abu Dhabi, Johns Hopkins Aramco) follow ESPEN/ASPEN guidelines closely
Smaller district hospitals and private facilities: variable adherence — often delayed EN initiation, under-assessment of nutritional status
Dietitian availability: 1 per 15–20 ICU beds in major centres; absent in many smaller facilities
ICU nutrition protocols: standardised in accredited JCI hospitals; ad hoc in others

Nurse's Role When Dietitian is Absent

Apply weight-based predictive equations (25–30 kcal/kg; 1.2–1.5 g protein/kg)
Select appropriate standard formula based on clinical condition
Initiate EN within 24–48 hrs per ICU admission protocol
Escalate to physician when disease-specific formula indicated
Document caloric intake and identify cumulative deficit (>5,000 kcal deficit correlates with worse outcomes)

Halal & Religious Considerations

Porcine Gelatine in Enteral Formulas

Many commercially available EN formulas (Ensure, Jevity, Osmolite, Glucerna) contain porcine (pig-derived) gelatine as a stabiliser or capsule material
Porcine gelatine is haram (forbidden) in Islamic jurisprudence for Muslim patients who are capable of making informed decisions
In GCC: most ICU patients are Muslim — this is a significant consideration
Many unconscious/critically ill patients: Islamic scholars differ on permissibility — majority allow non-halal formulas when no alternative available and life is at risk (darura principle)

Halal-Certified Formula Alternatives

Fresubin range (Fresenius Kabi) — many products halal-certified
Nutrison range (Nutricia) — halal-certified versions available
Peptamen (Nestlé) — halal options in GCC formulary
Verify with hospital pharmacy for current halal-certified formulary stock
Document patient/family preferences in care plan

Ramadan Fasting in ICU Patients

Islamic Jurisprudence & Critical Illness

Comatose/unconscious patients are exempt from fasting obligation — no religious duty applies to those unable to form intention (niyyah)
Critically ill patients unable to fast safely are also exempt — Quran 2:185 explicitly permits breaking fast during illness
Continuous enteral feeding is permissible during Ramadan for patients who are medically unable to fast safely
Do NOT delay or interrupt nutrition in unconscious/critically ill ICU patients for Ramadan fasting
Conscious ICU patients who wish to fast: involve physician, dietitian, and religious advisor — individual assessment required
If a conscious patient insists on fasting against medical advice: document informed refusal, ensure patient understands risks, maintain monitoring
For conscious patients fasting safely: nocturnal EN (Iftar to Suhoor schedule) is an option for step-down/ward patients — not applicable to most ICU patients

Obesity in GCC ICU Patients

Epidemiology

GCC has among the highest obesity prevalence globally — Saudi Arabia 35–40%, UAE 30–35%, Kuwait 42%. BMI >35 is common in GCC ICU admissions. Obesity paradox: mild obesity may be protective in critical illness, but extreme obesity (BMI >40) increases complications.

Hypocaloric High-Protein Strategy (BMI >30–35)

Calories: 11–14 kcal/kg actual body weight/day
Protein: 2.0–2.5 g/kg ideal body weight/day (for BMI 30–40)
Protein for BMI >40: up to 2.5 g/kg IBW/day
Aim: create mild caloric deficit while preserving lean muscle mass
Do NOT use actual body weight for protein calculations in morbid obesity — will over-calculate

Ideal Body Weight Calculations

IBW Male: 50 kg + 2.3 kg per inch over 5 feet (Devine)
IBW Female: 45.5 kg + 2.3 kg per inch over 5 feet (Devine)
Adjusted BW (for dose calculations): IBW + 0.4 × (Actual BW − IBW)
Use IBW for protein targets in obesity; use actual BW for caloric targets (hypocaloric formula)

Practical Formula Approach for Obese GCC ICU Patients

Select high-protein formula (Ensure Plus HP, Peptamen AF, Fresubin HP Energy) to meet protein targets without excessive volume
Consider adding protein modules (Protifar) to boost protein intake without caloric increase
Monitor blood glucose closely — insulin resistance exacerbated in obese critically ill
Diabetic formulas (Glucerna) may help with glycaemic control but not routinely required if insulin managed well
Vitamin D deficiency near-universal in obese GCC patients — supplement as per local protocol

GCC-Specific Nutrition Assessment Checklist Saved Locally

ICU / Critical Care Nutrition