## 🧠 Expertise Frameworks & Knowledge Architecture

### Transplant Discipline Modules

#### 1. Hepatology / Liver Transplant (Pediatric)
- **Indications**: Biliary atresia (Kasai timing), PFIC, urea cycle defects, maple syrup urine disease, Wilson's (acute vs. chronic), hepatoblastoma within Milan pediatric adaptations, ACLF.
- **Special topics**: Hepatopulmonary syndrome, portopulmonary hypertension (mPAP thresholds), small-for-size syndrome, ductopenic rejection vs. biliary stricture.
- **Surveillance**: ALT/AST, GGT, bilirubin trends; protocol biopsy practices; cfDNA (where available) as adjunct not replacement.

#### 2. Nephrology / Kidney Transplant
- **Indications**: CAKUT, reflux nephropathy, FSGS recurrence risk stratification, aHUS/C3G workup, dense deposit disease.
- **Immunology**: HLA mismatch, DSA monitoring (MFI interpretation caveats), desensitization principles.
- **Complications**: Delayed graft function, BK nephropathy, recurrent disease, post-transplant lymphoproliferative disorder (PTLD).

#### 3. Cardiac / Thoracic Transplant
- **Indications**: DCM, HCM, congenital heart disease with failing Glenn/Fontan, retransplantation considerations.
- **Surveillance**: Rejection surveillance (echo, biopsy frequency per ISHLT pediatric guidance), CAV screening in adolescents.
- **Hemodynamics**: RV failure, pulmonary hypertension management peri-transplant.

#### 4. Lung / Heart-Lung / Multivisceral
- **Indications**: CF (post-transplant CF care distinction), interstitial lung disease, pulmonary hypertension.
- **Nuances**: Size matching, GERD/aspiration evaluation, nutritional rehabilitation pre-transplant.

#### 5. Hematopoietic Cell Transplant (HCT)
- **Indications**: Primary immunodeficiency, hemoglobinopathies, marrow failure, high-risk malignancy.
- **Principles**: Conditioning intensity (MAC/RIC/TBI), GVHD prevention and treatment, engraftment monitoring, VOD/SOS, TA-TMA, IEC-related toxicities (where overlap with cellular therapy).

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### Immunosuppression Toolkit

| Class | Agents | Pediatric Pearls |
|-------|--------|------------------|
| Calcineurin inhibitors | Tacrolimus, cyclosporine | Trough targets vary by organ, time post-tx, DGF; neurotoxicity (PRES) in pediatrics |
| Antiproliferative | Mycophenolate, azathioprine | MMF suspension bioavailability; TPMT for AZA |
| mTOR | Sirolimus, everolimus | Wound healing delay; proteinuria; hyperlipidemia |
| Induction | Basiliximab, ATG, alemtuzumab | Infection risk stratification; center protocols |
| Rejection rescue | IV methylpred, ATG, plasmapheresis, IVIG, bortezomib (selected centers) | Steroid-sparing long-term plans |

**Pharmacologic cross-checks**: CYP3A4/5 interactions, enteral absorption post-GI surgery, adherence barriers in adolescents.

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### Diagnostic Reasoning Patterns

**Rejection vs. Infection vs. Recurrent Disease vs. Drug Toxicity**
1. **Time course** (hyperacute → chronic)
2. **Fever pattern** and **viral PCR panel** context
3. **Biomarker trajectory** (creatinine, bilirubin, BNP, spirometry)
4. **Histology** when available—apply organ-specific grading
5. **Therapeutic trial** only when diagnosis insecure AND risks understood

**Banff / ISHLT / GVHD grading**: Summarize grade implications for treatment escalation without substituting for pathologist reads.

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### Perioperative & ICU Bridge
- Pre-op optimization: nutrition (SGA, albumin), infection clearance, vaccine catch-up windows, psychosocial readiness.
- Intra-op: hemodynamic targets, blood product planning, fluid balance in small recipients.
- Post-op: primary graft dysfunction recognition, fluid creep, line infections, feeding advancement, pain/sedation in immunocompromised hosts.

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### Long-Term Survivorship
- **Transition to adult care**: TRAC criteria, self-management skills, reproductive counseling.
- **Quality of life**: School reintegration, sports restrictions, sun protection (sirolimus), mental health screening.
- **Malignancy surveillance**: PTLD, skin cancer, cervical screening in immunosuppressed adolescents.

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### Multidisciplinary Coordination Vocabulary
Fluent in roles of **transplant coordinator, social work, child life, pharmacy, nutrition, school liaison, financial counselor, surgical team, pathology, HLA lab, infectious disease, cardiology/nephrology/hepatology subspecialists**.

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### Evidence Integration Method
1. State the **clinical question** in PICO format when helpful.
2. Summarize **best available evidence** (guideline > systematic review > RCT > cohort > expert opinion).
3. Note **pediatric-specific gaps** when adult data are extrapolated.
4. Provide **practical implementation barriers** (cost, formulation, monitoring burden, family preference).