医疗CDSS开发模式
构建可集成至EMR工作流的临床决策支持系统的模式。CDSS模块关乎患者安全——对假阴性零容忍。
适用场景
- 实现药物相互作用检查
- 构建剂量验证引擎
- 实现临床评分系统（NEWS2、qSOFA、APACHE、GCS）
- 设计异常临床值警报系统
- 构建带安全校验的用药医嘱录入
- 结合临床上下文解读检验结果
工作原理
CDSS引擎是一个无副作用的纯函数库。输入临床数据，输出警报。这使得它完全可测试。
三个核心模块：
checkInteractions(newDrug, currentMeds, allergies)— 检查新药物与现有用药及已知过敏的冲突。返回按严重程度排序的InteractionAlert[]。使用DrugInteractionPair数据模型。validateDose(drug, dose, route, weight, age, renalFunction)— 根据体重、年龄和肾功能调整规则验证处方剂量。返回DoseValidationResult。calculateNEWS2(vitals)— 基于NEWS2Input计算国家早期预警评分2。返回包含总分、风险等级和升级指导的NEWS2Result。
EMR UI ↓ (用户输入数据)CDSS 引擎（纯函数，无副作用） ├── 药物相互作用检查器 ├── 剂量验证器 ├── 临床评分（NEWS2、qSOFA 等） └── 警报分类器 ↓ (返回警报)EMR UI（内联显示警报，严重时阻止操作）药物相互作用检查
typescript
interface DrugInteractionPair { drugA: string; // generic name drugB: string; // generic name severity: 'critical' | 'major' | 'minor'; mechanism: string; clinicalEffect: string; recommendation: string;}
function checkInteractions( newDrug: string, currentMedications: string[], allergyList: string[]): InteractionAlert[] { if (!newDrug) return []; const alerts: InteractionAlert[] = []; for (const current of currentMedications) { const interaction = findInteraction(newDrug, current); if (interaction) { alerts.push({ severity: interaction.severity, pair: [newDrug, current], message: interaction.clinicalEffect, recommendation: interaction.recommendation }); } } for (const allergy of allergyList) { if (isCrossReactive(newDrug, allergy)) { alerts.push({ severity: 'critical', pair: [newDrug, allergy], message: `Cross-reactivity with documented allergy: ${allergy}`, recommendation: 'Do not prescribe without allergy consultation' }); } } return alerts.sort((a, b) => severityOrder(a.severity) - severityOrder(b.severity));}相互作用对必须双向：若药物A与药物B相互作用，则药物B与药物A相互作用。
剂量验证
typescript
interface DoseValidationResult { valid: boolean; message: string; suggestedRange: { min: number; max: number; unit: string } | null; factors: string[];}
function validateDose( drug: string, dose: number, route: 'oral' | 'iv' | 'im' | 'sc' | 'topical', patientWeight?: number, patientAge?: number, renalFunction?: number): DoseValidationResult { const rules = getDoseRules(drug, route); if (!rules) return { valid: true, message: 'No validation rules available', suggestedRange: null, factors: [] }; const factors: string[] = [];
// SAFETY: if rules require weight but weight missing, BLOCK (not pass) if (rules.weightBased) { if (!patientWeight || patientWeight <= 0) { return { valid: false, message: `Weight required for ${drug} (mg/kg drug)`, suggestedRange: null, factors: ['weight_missing'] }; } factors.push('weight'); const maxDose = rules.maxPerKg * patientWeight; if (dose > maxDose) { return { valid: false, message: `Dose exceeds max for ${patientWeight}kg`, suggestedRange: { min: rules.minPerKg * patientWeight, max: maxDose, unit: rules.unit }, factors }; } }
// Age-based adjustment (when rules define age brackets and age is provided) if (rules.ageAdjusted && patientAge !== undefined) { factors.push('age'); const ageMax = rules.getAgeAdjustedMax(patientAge); if (dose > ageMax) { return { valid: false, message: `Exceeds age-adjusted max for ${patientAge}yr`, suggestedRange: { min: rules.typicalMin, max: ageMax, unit: rules.unit }, factors }; } }
// Renal adjustment (when rules define eGFR brackets and eGFR is provided) if (rules.renalAdjusted && renalFunction !== undefined) { factors.push('renal'); const renalMax = rules.getRenalAdjustedMax(renalFunction); if (dose > renalMax) { return { valid: false, message: `Exceeds renal-adjusted max for eGFR ${renalFunction}`, suggestedRange: { min: rules.typicalMin, max: renalMax, unit: rules.unit }, factors }; } }
// Absolute max if (dose > rules.absoluteMax) { return { valid: false, message: `Exceeds absolute max ${rules.absoluteMax}${rules.unit}`, suggestedRange: { min: rules.typicalMin, max: rules.absoluteMax, unit: rules.unit }, factors: [...factors, 'absolute_max'] }; } return { valid: true, message: 'Within range', suggestedRange: { min: rules.typicalMin, max: rules.typicalMax, unit: rules.unit }, factors };}临床评分：NEWS2
typescript
interface NEWS2Input { respiratoryRate: number; oxygenSaturation: number; supplementalOxygen: boolean; temperature: number; systolicBP: number; heartRate: number; consciousness: 'alert' | 'voice' | 'pain' | 'unresponsive';}interface NEWS2Result { total: number; // 0-20 risk: 'low' | 'low-medium' | 'medium' | 'high'; components: Record<string, number>; escalation: string;}评分表必须严格符合皇家内科医师学会规范。
警报严重程度与UI行为
| 严重程度 | UI行为 | 临床医生操作要求 |
|---|---|---|
| 危急 | 阻止操作。不可关闭的模态框。红色。 | 必须记录覆盖原因才能继续 |
| 主要 | 行内警告横幅。橙色。 | 必须确认后才能继续 |
| 次要 | 行内信息提示。黄色。 | 仅需知晓，无需操作 |
危急警报绝不能自动关闭或实现为Toast通知。覆盖原因必须存储在审计追踪中。
测试CDSS（对假阴性零容忍）
typescript
describe('CDSS — Patient Safety', () => { INTERACTION_PAIRS.forEach(({ drugA, drugB, severity }) => { it(`detects ${drugA} + ${drugB} (${severity})`, () => { const alerts = checkInteractions(drugA, [drugB], []); expect(alerts.length).toBeGreaterThan(0); expect(alerts[0].severity).toBe(severity); }); it(`detects ${drugB} + ${drugA} (reverse)`, () => { const alerts = checkInteractions(drugB, [drugA], []); expect(alerts.length).toBeGreaterThan(0); }); }); it('blocks mg/kg drug when weight is missing', () => { const result = validateDose('gentamicin', 300, 'iv'); expect(result.valid).toBe(false); expect(result.factors).toContain('weight_missing'); }); it('handles malformed drug data gracefully', () => { expect(() => checkInteractions('', [], [])).not.toThrow(); });});通过标准：100%。一次遗漏的相互作用即构成患者安全事件。
反模式
- 使CDSS检查变为可选或可跳过且无记录原因
- 将相互作用检查实现为Toast通知
- 使用
any类型处理药物或临床数据 - 硬编码相互作用对而非使用可维护的数据结构
- 静默捕获CDSS引擎错误（必须大声暴露失败）
- 在体重数据缺失时跳过基于体重的验证（必须阻止，而非通过）
示例
示例1：药物相互作用检查
typescript
const alerts = checkInteractions('warfarin', ['aspirin', 'metformin'], ['penicillin']);// [{ severity: 'critical', pair: ['warfarin', 'aspirin'],// message: 'Increased bleeding risk', recommendation: 'Avoid combination' }]示例2：剂量验证
typescript
const ok = validateDose('paracetamol', 1000, 'oral', 70, 45);// { valid: true, suggestedRange: { min: 500, max: 4000, unit: 'mg' } }
const bad = validateDose('paracetamol', 5000, 'oral', 70, 45);// { valid: false, message: 'Exceeds absolute max 4000mg' }
const noWeight = validateDose('gentamicin', 300, 'iv');// { valid: false, factors: ['weight_missing'] }示例3：NEWS2评分
typescript
const result = calculateNEWS2({ respiratoryRate: 24, oxygenSaturation: 93, supplementalOxygen: true, temperature: 38.5, systolicBP: 100, heartRate: 110, consciousness: 'voice'});// { total: 13, risk: 'high', escalation: 'Urgent clinical review. Consider ICU.' }
