skills/hoc-y/references/clinical-learning-ladder.md

# Clinical Learning Ladder

> **Áp dụng cho học tập:** Mọi "ca", "bệnh nhân", "xử trí", "xét nghiệm" hay "decision" bên dưới chỉ là dữ kiện thuộc **tình huống hoàn toàn giả định, không có người bệnh thật**. Đọc cùng `educational-boundaries.md`; không sử dụng các gợi ý này trong chăm sóc, hồ sơ hoặc quyết định y tế thực tế.


Use this framework to connect foundational knowledge to clinical reasoning without forcing every learner to start at the beginning.

Core ladder:

**Basic science → Mechanism → Signs & Symptoms → Syndrome → Differential → Investigation → Management → Reassessment**

The ladder is an **adaptive route**, not a compulsory linear lecture. Enter at the lowest rung that is necessary for the learner's current goal and demonstrated performance. Skip rungs that are already secure. Step backward only when a higher-level error is caused by a missing prerequisite, then reconnect and move forward again.

## 1. The eight rungs

### Rung 1 — Basic science
Question: **What is normal, and what foundational concept must be understood first?**

Typical domains: anatomy, histology, physiology, biochemistry, microbiology, immunology, pharmacology foundations.

Observable evidence of readiness:
- explains the relevant normal structure/function in simple causal terms;
- identifies the prerequisite concept needed for the topic;
- can predict one basic consequence when the normal system is perturbed.

Do not overload the learner with all possible foundational details. Teach only what supports the current topic.

### Rung 2 — Mechanism / pathophysiology
Question: **What changes, why does it change, and what does that cause?**

Preferred chain:
**Trigger/process → physiologic/pathologic change → consequence → manifestation/test/treatment implication**.

Observable evidence:
- explains the causal chain rather than reciting isolated facts;
- uses mechanism to predict at least one sign, symptom, laboratory finding or treatment effect.

### Rung 3 — Signs & Symptoms
Question: **What would I expect to see, hear, measure or elicit?**

Prioritize:
- hallmark features;
- discriminators;
- red flags;
- severity clues;
- important negative findings.

Observable evidence:
- recognizes the typical presentation;
- identifies which findings are decisive rather than listing everything;
- does not miss safety-critical features appropriate to the learner level.

### Rung 4 — Syndrome / problem representation
Question: **What pattern do these findings form?**

Teach the learner to compress the case into a concise representation using age/context, time course, key syndrome, severity and discriminating positives/negatives.

Observable evidence:
- can name or describe the syndrome/pattern;
- produces a concise problem representation;
- avoids premature diagnosis when the data support only a syndrome.

### Rung 5 — Differential / discriminators
Question: **What else could look like this, and what separates the close alternatives?**

Prefer a prioritized differential:
- common/likely;
- dangerous cannot-miss;
- mimic/easily confused;
- context-specific.

Observable evidence:
- ranks rather than lists;
- names the decisive discriminator between close alternatives;
- keeps Must not miss conditions visible without making them automatically the most likely diagnosis.

### Rung 6 — Investigation
Question: **What clinical question does this test answer, and how would the result change the next decision?**

Use:
**Test → Clinical question → Possible result → Decision consequence**.

Observable evidence:
- chooses tests for a reason;
- distinguishes urgent, useful-later and unnecessary testing;
- interprets results in context rather than as isolated numbers.

### Rung 7 — Management
Question: **What should be done now, why, and in what sequence?**

Use:
**Situation → Priority → Decision → Rationale → Monitoring**.

For unstable patients, stabilization and escalation precede diagnostic completeness.

Observable evidence:
- prioritizes first steps;
- links intervention to the problem it addresses;
- identifies major contraindications or safety issues when relevant;
- respects supervision limits for students.

### Rung 8 — Reassessment
Question: **How do I know the plan worked, failed or needs escalation?**

Use:
**Intervention → Expected response → Monitoring endpoint → Reassess → Continue / modify / escalate / reconsider diagnosis**.

Observable evidence:
- names concrete response/failure markers;
- knows when to escalate or reconsider;
- closes the loop instead of treating management as the endpoint.

## 2. Entry-point selection by learner level

Use year only as a starting heuristic; demonstrated performance overrides it.

- **Y1:** usually enter at Basic science; use Mechanism and a simple clinical anchor when helpful.
- **Y2:** usually enter at Basic science or Mechanism; progress to Signs & Symptoms to connect abnormal process to manifestation.
- **Y3:** often enter at Mechanism or Signs & Symptoms; build Syndrome and basic Investigation logic.
- **Y4:** often enter at Signs & Symptoms or Syndrome; emphasize Differential and Investigation logic; step backward only if a prerequisite gap blocks reasoning.
- **Y5:** often enter at Syndrome/Differential; emphasize severity, Investigation, Management and Reassessment.
- **Y6:** often enter at Syndrome/Differential or Management in time-sensitive scenarios; emphasize prioritization, stabilization, escalation, uncertainty and Reassessment.

Never make a Y5/Y6 learner repeat Basic science by default if the foundation is already adequate.

## 3. Gate rule

At each rung, ask whether the learner has enough understanding to support the next decision.

**Pass:** reasoning is correct, independent and transferable → move forward or increase complexity.

**Fragile:** final answer is correct but explanation is weak/contradictory → one targeted probe before advancing.

**Gap:** error is caused by a missing prerequisite → step back to the narrowest relevant rung, repair briefly, reconnect, then retest.

**Safety gap:** learner misses a Must not miss feature or dangerous priority → interrupt the normal progression, repair safety logic immediately, then return to the ladder.

Avoid testing every rung mechanically. Use the minimum number of probes needed to locate the gap.

## 4. Backward and forward bridging

### Backward bridge
Use when a learner is stuck at a higher rung.

Examples:
- wrong management choice → ask what diagnosis/severity assumption drove it;
- wrong test choice → ask what clinical question they are trying to answer;
- weak differential → revisit syndrome/problem representation;
- weak syndrome recognition → revisit discriminating signs & symptoms;
- memorized signs without understanding → revisit mechanism;
- weak mechanism → revisit the specific basic-science prerequisite.

### Forward bridge
After repair, reconnect to the original task:

**Foundation → Mechanism → Expected manifestation → Pattern → Decision implication → Retest**.

Never end the repair at the prerequisite. The learner should see why the prerequisite matters clinically.

## 5. Content-priority overlay

The ladder answers **where to learn**. The content-priority framework answers **how much attention each item deserves**.

At every rung:
- **Must know:** essential for the learner's current level and next reasoning step;
- **Should know:** improves discrimination/integration;
- **Mở rộng:** enrichment after the core is secure;
- **Must not miss:** safety overlay that may appear on any rung.

A single concept may carry more than one label. Example: recognizing shock may be both **Must know** and **Must not miss**.

## 6. Topic-fit rule

Do not force the full ladder onto topics that do not need it.

- Pure anatomy/biochemistry topics may stop at Basic science → Mechanism → application anchor.
- Pharmacology topics can map Basic science → receptor/target → mechanism → effects/adverse effects → indication/decision → monitoring/reassessment.
- Public health/research topics may use a different reasoning structure if the clinical ladder is not appropriate.

The ladder is preferred when the topic is a disease, syndrome, symptom, investigation, treatment decision or clinically anchored basic-science concept.

## 7. Teaching moves by request

### “Dạy tôi chủ đề X”
Choose an entry point, give the core map, teach 1–3 adjacent rungs, then retrieve/apply before moving on.

### “Tôi không hiểu vì sao…”
Enter at Mechanism; step back to Basic science only if needed.

### “Tôi hay nhầm bệnh A và B”
Enter at Signs & Symptoms/Syndrome/Differential; identify discriminators and revisit mechanism only if it explains the difference.

### “Tôi không biết chọn xét nghiệm”
Enter at Differential/Investigation; ask the clinical question before naming the test.

### “Tôi biết chẩn đoán nhưng không biết xử trí”
Enter at Management, but verify severity/Must not miss assumptions first.

### “Ca này sau điều trị làm gì?”
Enter at Reassessment and close the loop.

## 8. Compact ladder map

When useful, show a one-line roadmap such as:

**Entry: Signs & Symptoms → Syndrome → Differential → Investigation**  
**Repair if needed: Mechanism**  
**Safety overlay: Must not miss red flags**

Do not display the full eight-rung ladder every time unless it helps orientation.