Tier 1 - must know
Feline
Gastrointestinal
Nutrition emergencyHigh yield
Feline Hepatic Lipidosis
Anorexia in an overweight cat is a nutritional emergency, not a wait-and-see liver enzyme problem.
⏱ 6-8 min read · Topic 91 of 141
5
Practice Qs
7
Traps
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Exam freq.
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Study step
High-yield takeaways
- Recognize the classic presentation, then narrow the case using signalment, timeline, exam findings, diagnostics, and response to treatment.
- Use the decision framework, traps, differentials, and related questions to rehearse NAVLE-style next-best-step reasoning.
- This educational study page is not a clinical protocol; confirm patient-specific decisions with current references and clinician judgment.
30-second revision
Classic triggerOverweight cat + anorexia > 3-5 days + icterus.
ConfirmSupportive labs/US, confirm with lipid-laden hepatocytes when safe.
Core treatmentEnteral nutrition, usually via feeding tube, plus anti-nausea/supportive care.
Refeeding trapAdvance calories gradually and monitor phosphorus, potassium, magnesium.
Differential trapFind the disease or stressor that caused anorexia.
Procedure gateCheck coagulation risk before invasive sampling.
How NAVLE tests this topic
How NAVLE tests it → The stem usually asks for diagnosis from the obese-anorectic-icteric cat, the next best treatment, or the refeeding complication.
Diagnostic hinge → Chemistry and ultrasound support the pattern, but cytology showing lipid-laden hepatocytes confirms the diagnosis when sampling is safe.
Management hinge → Feeding-tube nutrition is the cornerstone; antiemetics and appetite stimulants are adjuncts, not substitutes.
Differential hinge → Pancreatitis, cholangitis/cholangiohepatitis, obstruction, neoplasia, CKD, diabetes, and stressors are common triggers or mimics.
Pathophysiology that changes decisions
Anorexia trigger → Cats mobilize peripheral fat during negative energy balance; obese cats mobilize enough fat to overwhelm hepatic handling.
Hepatic dysfunction → Triglyceride accumulation in hepatocytes causes cholestasis, icterus, hepatomegaly, nausea, and worsening anorexia.
Underlying disease loop → Pancreatitis, cholangitis, GI disease, diabetes, CKD, neoplasia, pain, or stress can start the anorexia and must be pursued.
Refeeding risk → Rapid nutrition restart after starvation can drive intracellular electrolyte shifts, especially hypophosphatemia with weakness or hemolysis.
NAVLE rewards the sequence: recognize the anorexia-lipidosis pattern, confirm it safely, feed enterally, and do not miss the primary trigger.
Key clinical patterns
Core pattern
overweight or recently overweight cat with anorexia longer than 3-5 daysicterus, lethargy, vomiting, dehydration, muscle wasting, or hepatomegalymarked ALT/AST and bilirubin increase with possible ALP/GGT changesultrasound showing enlarged hyperechoic liver without an obstructive patternweakness or hemolysis after aggressive feeding suggesting refeeding syndrome
Supporting clues
recent diet change, household stress, boarding, illness, pain, dental disease, or medication changepancreatic, biliary, intestinal, renal, diabetic, or neoplastic comorbidity cluesPT/PTT before invasive sampling if icteric or clinically bleedingelectrolytes before and during nutrition restartowner ability to manage feeding tube and follow-up
NAVLE trigger: If an overweight cat stops eating and becomes icteric, the answer is usually not "try appetite stimulants and wait." It is feeding-tube planning plus trigger search.
Decision framework - what NAVLE asks
Icteric anorectic overweight cat
Place hepatic lipidosis high, assess hydration/electrolytes/coagulation, image the hepatobiliary tract, and plan safe confirmation.
Inadequate voluntary intake
Choose enteral feeding support, commonly an esophagostomy tube, rather than relying on appetite stimulants alone.
Possible refeeding syndrome
Slow calorie advancement and monitor phosphorus, potassium, magnesium, glucose, and clinical strength closely.
Concurrent disease clues
Pursue pancreatitis, cholangitis, GI obstruction, CKD, diabetes, neoplasia, pain, or environmental stress as the cause of anorexia.
Coagulopathy or invasive sampling planned
Check coagulation status and correct clinically important abnormalities before biopsy-level procedures; do not make invasive sampling automatic.
Diagnostic priorities and interpretation
ALT/AST and bilirubin
Hepatic injury + cholestasis
Supports the pattern but does not explain why the cat stopped eating.
Ultrasound
Large bright liver
Supports lipidosis and screens for biliary obstruction, masses, pancreatitis, or GI disease.
Fine-needle aspirate
Lipid-laden hepatocytes
High-yield confirmation when sampling is safe and coagulation risk is acceptable.
Electrolytes
P/K/Mg monitor
Phosphorus decline after feeding is the classic refeeding danger signal.
PT/PTT
Procedure gate
Icteric cats can have vitamin K-responsive coagulopathy; invasive choices should be risk-aware.
Body and muscle condition
Nutrition plan driver
Current weight, ideal weight, and muscle loss guide feeding calculations and prognosis.
Do not let one high ALT value end the workup. The decision-changing data are nutrition risk, confirmation, obstruction/comorbidity clues, and electrolyte trends.
Treatment escalation and management logic
Stabilize
Correct dehydration, nausea, electrolyte abnormalities, and perfusion problems before forcing full calories.
A cat that cannot tolerate feeding must be stabilized enough for safe enteral nutrition.
Feed enterally
Place an appropriate feeding tube when intake is inadequate and advance calories gradually toward calculated needs.
Tube feeding is the cornerstone; appetite stimulants are adjuncts only.
Monitor refeeding
Recheck phosphorus, potassium, magnesium, glucose, hydration, nausea, and weakness during early feeding escalation.
Weakness or hemolysis after feeding should trigger refeeding syndrome thinking.
Treat the trigger
Investigate and manage pancreatitis, cholangitis, intestinal disease, obstruction, CKD, diabetes, neoplasia, dental pain, or stressors.
Lipidosis can recur if the anorexia driver remains.
Follow-up
Track weight, appetite, bilirubin/liver enzymes, tube tolerance, and owner ability to deliver the plan.
Recovery is often slow but can be good when nutrition and the underlying disease are controlled.
NAVLE traps — where students lose marks
Waiting for the cat to eat voluntarily
Ongoing anorexia perpetuates hepatic lipidosis; early enteral nutrition is the core therapy.
Using appetite stimulants as the primary plan
They may help after nausea and disease are addressed, but they do not replace feeding-tube support in a cat not eating.
Starting full calories immediately
Starved cats are at risk for refeeding syndrome, especially hypophosphatemia with weakness or hemolysis.
Choosing a low-protein diet by reflex
Most hepatic lipidosis cats need adequate protein and calories unless a specific complication changes the plan.
Forgetting the underlying trigger
Pancreatitis, cholangitis, GI disease, CKD, diabetes, pain, or stress often caused the anorexia.
Biopsying an icteric cat without coagulation context
Coagulopathy can change the safest sampling approach.
Calling every icteric cat lipidosis
Biliary obstruction, cholangitis, pancreatitis, neoplasia, hemolysis, and FIP-like systemic disease remain important differentials.
Differential diagnosis framework
Fast separator: hepatic lipidosis is an anorexia-nutrition emergency. Then ask whether pancreatitis, cholangitis, obstruction, neoplasia, CKD, diabetes, pain, or stress caused the anorexia.
| Differential | Key clue | Best discriminator | Common trap |
|---|---|---|---|
| Hepatic lipidosis | Overweight cat, anorexia, icterus, hepatomegaly | Cytology plus nutrition-risk pattern | Treating with appetite stimulant only |
| Pancreatitis/triaditis | Vague illness, vomiting, abdominal discomfort, biliary/intestinal overlap | fPLI/ultrasound plus concurrent disease pattern | Missing the trigger for lipidosis |
| Cholangitis/cholangiohepatitis | Fever, inflammatory leukogram, biliary abnormalities, jaundice | Bile/liver sampling context and culture/cytology as indicated | Calling all jaundice lipidosis |
| Extrahepatic biliary obstruction | Marked cholestasis, duct/gallbladder/pancreatic obstruction clues | Ultrasound and obstruction pattern | Starting nutrition plan without obstruction screen |
| Neoplasia or FIP-like systemic disease | Mass, effusion, persistent fever, lymphadenopathy, systemic decline | Imaging/cytology and systemic pattern | Anchoring on obesity alone |
| CKD/diabetes/dental or pain trigger | PU/PD, renal or glucose changes, oral pain, weight trend | Problem list explains anorexia before liver failure | Not searching for the anorexia cause |
Calculator applications and clinical tools
Calculator use is central for nutrition planning and supportive for body-condition monitoring. These tools support the feeding plan after the diagnostic and stabilization branch is clear.
Related questions
Practice anorexia-lipidosis recognition, feeding decisions, refeeding syndrome, and trigger search.
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An overweight 9-year-old cat has not eaten for 6 days after a household move. It is icteric, dehydrated, and has hepatomegaly with high ALT and bilirubin. Which diagnosis should be prioritized?
A cat with confirmed hepatic lipidosis is still refusing food after antiemetic therapy. What is the cornerstone of management?
After rapid full-calorie feeding is started, a cat becomes weak and hemolyzes with a marked phosphorus drop. What complication is being tested?
A lipidosis-pattern cat also has pancreatic pain and ultrasound changes around the pancreas and bile duct. What should the clinician avoid?
An icteric cat with suspected hepatic lipidosis needs invasive liver sampling, but PT/PTT are prolonged. What is the safest interpretation?