Clinical Nutrition in Complex Illness
An advanced clinical guide to metabolic triage, specialized enteral and parenteral compounding, and physiological rescue in organ failure. Learn to make high-stakes feeding decisions, troubleshoot intestinal failure, and navigate immunometabolic shifts.
Like Duolingo, but for Clinical Nutrition in Complex Illness. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
23 levels across 4 sections, about 46 minutes end to end, roughly 9 days at five minutes a day. It moves through Acute Metabolic Triage in Critical Care, Complex Gut Failure and Specialized Access, Multisystem Derangements and Refeeding, and Immunometabolism and Chronic Catabolism.
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Key ideas in Clinical Nutrition in Complex Illness
- Targeting 11–14 kcal/kg actual weight (or hypocaloric delivery) while providing high protein (1.2–2.0+ g/kg) mitigates catabolic muscle wasting without exacerbating metabolic overload
- Endogenous glucose production cannot be suppressed by exogenous calories during early critical illness flow phase; full caloric feeding prompts severe hyperglycemia, steatosis, and suppresses cellular autophagy
- Acute mitochondrial dysfunction in early sepsis restricts oxidative phosphorylation, turning overfeeding into physiological stress
- Propofol is formulated in a 10% lipid emulsion delivering approximately 1.1 kcal/mL, which can yield hundreds of unanticipated daily fat calories
- Trisodium citrate utilized in CRRT circuits is metabolized into bicarbonate and generates roughly 3.0 kcal per gram of citrate absorbed
- Dextrose carrier solutions provide 3.4 kcal per gram of anhydrous dextrose (e.g., D5W at 100 mL/hr provides ~408 kcal/day)
- The metabolic cart measures VO2 and VCO2 at the mouth, assuming CO2 production matches cellular respiration; active hyperventilation washes out systemic bicarbonate as respiratory CO2, falsely elevating RQ above physiologic substrate oxidation limits
- A true steady-state physiologic RQ remains between 0.67 (ketone/fat oxidation) and 1.0–1.2 (pure carbohydrate oxidation or net de novo lipogenesis)
- Indirect calorimetry data must be vetted for non-steady-state criteria (e.g., fluctuating minute ventilation, air leaks) before adjusting nutrient ratios
- Predictive equations (e.g., Penn State, Mifflin-St Jeor, weight-based rules of thumb) deviate significantly in extreme BMI classes and cannot differentiate third-space edema fluid from metabolically active lean tissue
- Indirect calorimetry measures actual resting energy expenditure by gas exchange, avoiding the underestimation or overestimation inherent to adjusted or actual weight calculations in severe fluid overload
- Fluid retention inflates total body mass without increasing metabolic oxygen consumption proportionately
- Urinary urea nitrogen reflects catabolism only when systemic urea is at steady state; worsening azotemia traps urea in total body water, falsely showing low urinary nitrogen excretion
- Wound, fistula, and open-abdomen exudates can shed 15–30+ g of protein per liter of effluent (~2–5 g of nitrogen), which must be added to total losses
- In CRRT, nitrogen is cleared via effluent rather than bladder catheterization, requiring effluent collection or specialized clearance equations to assess total nitrogen loss
- Delivering nutrients into the gut lumen triggers local oxygen and energy demands that an under-perfused splanchnic circulation cannot meet, inducing non-occlusive mesenteric ischemia (NOMI)
You've tried the other tabs
Thirty open tabs. Four facts you actually kept.
You watched. You nodded. By Sunday it was gone.
One answer, then back to scrolling.
Eight weeks. You meant to finish. You didn't.
Tomo gives Clinical Nutrition in Complex Illness the Duolingo treatment: levels, streaks, and quick quizzes that test what you just learned. That game loop is what the tabs above never had, so it's the one you actually finish.
Here's what playing it feels like
A real question from this course. Take your best guess.
Why does full caloric feeding cause severe hyperglycemia and liver steatosis during the early acute flow phase?
Get it right to open this lesson and 22 more in the app.
Where Clinical Nutrition in Complex Illness takes you
- 1
Acute Metabolic Triage in Critical Care
- Dynamic Energy and Protein Targets in the ICU
- Enteral Delivery in Hemodynamic Instability
- 2
Complex Gut Failure and Specialized Access
- Parenteral Nutrition Formulation and Compounding
- Managing Intestinal Failure and Enterocutaneous Fistulas
- 3
Multisystem Derangements and Refeeding
- Nutritional Prescription in Continuous Dialysis and Liver Failure
- Refeeding Syndrome: Pathophysiology and Dynamic Resuscitation
- 4
Immunometabolism and Chronic Catabolism
- Pharmaconutrition and Sarcopenic Catabolism
4 sections · 7 units · 23 levels. Built to play, not to enroll.
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