| Drug | Dose | Route | Notes |
|---|---|---|---|
| Lactulose (Kristalose) 1ST LINE | 30 mL PO q1โ2h until first BM โ titrate to 3โ4 soft stools/day | PO/NG/PR | Cornerstone of HE treatment. Acidifies colon โ traps NH4+ โ reduces ammonia absorption. Enema (300 mL in 700 mL water) if unable to take PO. Titrate to stool output, NOT ammonia level. |
| Rifaximin (Xifaxan) | 550 mg PO BID | PO | Non-absorbable antibiotic. Added to lactulose for recurrence prevention -reduces HE recurrence by 58% RFHE, 2010. Not just for acute treatment. Well tolerated, minimal systemic absorption. |
| Zinc sulfate | 220 mg PO daily | PO | Zinc deficiency impairs the urea cycle, worsening ammonia metabolism. Adjunctive therapy. Common deficiency in cirrhosis. |
| LOLA (L-ornithine L-aspartate) | Per protocol | PO/IV | Adjunct therapy. Provides substrates for ammonia metabolism (urea cycle and glutamine synthesis). Evidence modest -use as add-on when lactulose + rifaximin insufficient. |
| Metronidazole (Flagyl) | 250 mg PO TID | PO | Only if rifaximin unavailable. Reduces ammonia-producing gut bacteria. Limit duration -neurotoxicity with prolonged use (peripheral neuropathy, cerebellar dysfunction). Not first-line. |
Patient: 61M with alcohol-related cirrhosis (Child-Pugh B), presents with confusion and asterixis. Found to have melena. Family reports increasing somnolence over 24 hours.
Key findings: Temp 37.4ยฐC, HR 104, BP 102/58. Disoriented to time and place, asterixis present, no focal neurological deficits. West Haven Grade III. Hgb 7.8 (baseline 10.2), ammonia 142, Cr 1.6. CT head: no acute abnormality.
Management:
Teaching point: Always identify and treat the precipitant. GI bleed is a common trigger because blood in the gut is a massive protein/nitrogen load that gut bacteria convert to ammonia. The ammonia level does NOT guide treatment -- treat the clinical grade.
Patient: 58F with NASH cirrhosis, admitted 3 days ago with Grade III HE. On lactulose 30 mL q6h with 3-4 stools/day but remains persistently confused and intermittently combative.
Key findings: Still disoriented, asterixis present, no improvement in West Haven grade despite adequate lactulose. All precipitants addressed: no infection, electrolytes corrected, no offending medications. Ammonia trending down but mental status unchanged.
Management:
Teaching point: When HE does not respond to lactulose, broaden the differential. Cirrhotic patients can have multiple simultaneous causes of altered mental status. Do not anchor on HE alone.
Patient: 64M with compensated HCV cirrhosis (Child-Pugh A), referred by hepatologist for cognitive complaints. Wife reports he has become forgetful, has difficulty managing finances, and had a minor car accident last month. No overt confusion or asterixis.
Key findings: Alert, oriented x3, no asterixis. However, psychometric testing (Stroop test, number connection test) is abnormal. Ammonia 68. MRI brain: no structural abnormality. Diagnosis: Covert (minimal) hepatic encephalopathy.
Management:
Teaching point: Covert HE affects up to 80% of cirrhotic patients and significantly impairs quality of life. Protein restriction is a harmful myth -- adequate protein intake is essential. Always screen for driving safety concerns.
| Parameter | Frequency | Target / Action |
|---|---|---|
| West Haven grade | q4โ8h (more frequent if worsening) | Track mental status: orientation, asterixis, somnolence. Grade 3โ4 โ consider ICU for airway protection. |
| Asterixis | Each assessment | Negative myoclonus ("liver flap"). Presence confirms HE. Disappearance suggests improvement. |
| Orientation | Each assessment | Person, place, time, situation. Serial number connection test if able to participate. |
| Lactulose stool output | Strict I&O tracking | Target 3โ4 stools/day. Too few โ increase lactulose. Excessive diarrhea โ dehydration โ worsens HE. |
| Ammonia level | On admission only | Do NOT trend ammonia -it does NOT correlate with severity. An initial elevated ammonia supports the diagnosis but serial levels do not guide treatment. Treat clinically. |
| BMP (K+, Na+, Cr, BUN) | Daily | Hypokalemia โ metabolic alkalosis โ increased renal ammonia production โ worsens HE. Hyponatremia worsens cerebral edema. Cr for HRS surveillance. |
| Infection workup | On admission + any worsening | CBC, blood cultures, UA/UCx, CXR, diagnostic paracentesis (rule out SBP -most commonly missed precipitant). Repeat paracentesis with any AMS change. |