1. Criteria for De-escalation of Intensive Therapies

Discontinue antidotes and extracorporeal removal once toxic metabolites and acidosis resolve, guided by laboratory and clinical endpoints.

Laboratory Endpoints for Antidote Discontinuation

• Serum methanol or ethylene glycol < 20 mg/dL
• Anion gap < 12 mEq/L
• Blood pH ≥ 7.30 without bicarbonate infusion

Clinical Endpoints

• Stable mental status (return to baseline Glasgow Coma Scale)
• Hemodynamic stability (Mean Arterial Pressure ≥ 65 mmHg without escalating support)

Stopping Fomepizole/Ethanol

• Fomepizole: Administer the last dose once laboratory and clinical criteria are met on two consecutive occasions.
• Ethanol: Taper the infusion over several hours to avoid iatrogenic alcohol withdrawal.

Hemodialysis Cessation

• Pre-dialysis toxin level < 20 mg/dL and a normalized anion gap.
• Arterial pH ≥ 7.30 and lactate < 2 mmol/L.
• Evidence of adequate intrinsic renal clearance or planned ongoing renal replacement therapy (RRT) for underlying kidney injury.
• Observe for at least 4 hours post-dialysis to confirm metabolic stability and rule out rebound toxicity.

2. Conversion from IV to Enteral Medications

Transition to enteral therapy when gastrointestinal function returns, accounting for absorption kinetics, formulation properties, and feeding tube compatibility.

Assess GI Function

• Presence of bowel sounds
• Tolerance of trophic or full enteral nutrition
• Absence of clinical signs of ileus or significant abdominal distension

Pharmacokinetic Considerations

• Be aware of bioavailability changes due to critical illness (e.g., delayed gastric emptying, altered gut perfusion).
• Adjust doses as needed to account for the recovery of first-pass metabolism.

Formulation Selection

• Prefer immediate-release tablets that can be crushed or liquid formulations.
• Only crush film-coated tablets if known to be safe; never crush enteric-coated or extended-release products.

Tube-Feeding Compatibility

• Flush the feeding tube with 15–30 mL of water before and after medication administration.
• Avoid administering oil-based or high-viscosity suspensions that can clog tubes.

Monitoring

• Check therapeutic drug levels when available and indicated (e.g., phenobarbital).
• Monitor for clinical signs of malabsorption (subtherapeutic effect) or intolerance (e.g., diarrhea).

3. Post-ICU Syndrome (PICS) Risk Identification and Mitigation

PICS encompasses new or worsened physical, cognitive, and psychological deficits following critical illness. Proactive implementation of the ABCDEF bundle is the most effective strategy to reduce its incidence and severity.

PICS Components

• Physical: ICU-acquired weakness, impaired pulmonary function, muscle wasting.
• Cognitive: Deficits in memory, attention, and executive function.
• Psychological: Post-traumatic stress disorder (PTSD), anxiety, depression.

4. Medication Reconciliation and Discharge Planning

A thorough, stepwise medication reconciliation process is essential to prevent errors. Effective patient education and scheduling of critical follow-up appointments are vital for a safe transition.

Reconciliation Process

• Compare the pre-admission medication list, all medications administered in the ICU, and the proposed discharge medication list.
• Explicitly address any dose adjustments, discontinuations, and potential drug-drug interactions.

Patient/Caregiver Education

• Provide clear, printed medication schedules that include drug names, doses, indications, and common side effects.
• Use the “teach-back” method to confirm understanding.
• Highlight specific signs of recurrent toxicity or withdrawal syndromes to watch for at home.

Outpatient Follow-up Scheduling

• Vision: Schedule with ophthalmology within 1–2 weeks after significant methanol exposure.
• Renal: Schedule with nephrology or primary care for eGFR and urinalysis checks, typically every 1–3 months initially.
• Neurologic/Cognitive: Schedule follow-up with neuropsychology or primary care at 3 months for cognitive screening.

5. Monitoring for Long-Term Sequelae

Survivors of severe toxic alcohol or small-molecule poisoning require ongoing surveillance for delayed or persistent vision, kidney, and neurologic complications.

Vision Surveillance (especially post-methanol)

• Baseline and follow-up testing of visual acuity and color vision.
• Fundoscopic examination to assess for optic disc pallor or edema.
• Optical Coherence Tomography (OCT) imaging, if available, to quantify retinal nerve fiber layer thickness.

Renal Surveillance (especially post-ethylene/diethylene glycol)

• Monitor serum creatinine and eGFR trends over time.
• Perform annual urinalysis to screen for proteinuria or other signs of chronic kidney disease.

Neurologic/Cognitive Surveillance

• Administer cognitive screening tools (e.g., Montreal Cognitive Assessment – MoCA) at follow-up visits.
• Screen for depression and anxiety using validated questionnaires (e.g., PHQ-9, GAD-7).

6. Coordination of Care Pathways

Multidisciplinary collaboration and the use of clear communication tools are paramount to ensure safe and effective continuity of care across different settings.

Team Roles and Responsibilities

• Pharmacy: Leads medication reconciliation, provides final dose adjustments, and delivers patient counseling.
• Nephrology: Manages ongoing renal follow-up and long-term RRT planning if required.
• Ophthalmology: Conducts specialized vision monitoring and directs treatment for ocular toxicity.
• Social Work/Case Management: Arranges follow-up appointments, addresses barriers to care, and connects patients with community resources.

Communication Strategies

• Include a detailed summary from multidisciplinary rounds in the discharge summary.
• Initiate direct, “warm handoff” calls to key outpatient providers for complex cases.
• Utilize EHR-based discharge alerts and shared care pathway templates to ensure all team members are aware of the plan.

7. Quality Improvement and Protocol Review

Systematically evaluate patient outcomes and update local protocols by establishing key performance metrics and consistent feedback loops.

Key Performance Metrics to Track

• Rate of hospital readmissions within 30 days of discharge.
• Incidence of PICS and measurement of functional status scores (e.g., Barthel Index) at follow-up.
• Detection rates of new-onset vision or renal impairment post-discharge.
• Medication errors or discrepancies identified at the first outpatient visit.

Feedback Loops for Continuous Improvement

• Conduct quarterly multidisciplinary debriefings to review complex cases and outcomes.
• Formally review and update toxicology treatment and discharge protocols based on outcome data and new evidence from the literature.