# AI指示CPR按压深度为2英寸，但AHA 2020指南要求成人2-2.4英寸

- **ID:** `emergency/cpr-compression-depth-2-inches`
- **领域:** emergency
- **类别:** life_safety
- **错误码:** `CPR-DEPTH-ERR-004`
- **验证级别:** ai_generated
- **修复率:** 82%

## 根因

AI依赖过时的2015年前CPR按压深度建议（2英寸），而非当前AHA 2020指南中成人胸外按压的2-2.4英寸（5-6厘米），导致灌注不足。

## 版本兼容性

| 版本 | 状态 | 引入 | 弃用 |
|------|------|------|------|
| AHA 2020 | active | — | — |
| ERC 2021 | active | — | — |
| ILCOR 2020 | active | — | — |

## 解决方案

1. ```
   Update prompt to specify 'Push at least 2 inches but no more than 2.4 inches (5-6 cm) at a rate of 100-120 compressions per minute'
   ```
2. ```
   Reference AHA 2020 directly in system prompt: 'According to AHA 2020 guidelines, adult CPR compression depth is 2-2.4 inches (5-6 cm).'
   ```
3. ```
   Use a chain-of-thought check: 'Verify compression depth against current year guidelines before responding. If uncertain, state the range and recommend training.'
   ```

## 无效尝试

- **Recommending 1.5 inches depth as 'adequate for children'** — 1.5 inches is specific to infants (4 cm); for adults it is dangerously shallow (75% 失败率)
- **Telling users to 'push as hard as you can'** — Overly vague; can cause rib fractures or insufficient depth if rescuer is weak (60% 失败率)
- **Using 2.5 inches as 'better'** — Exceeds 2.4 inch upper limit, increasing risk of injury without proven benefit (85% 失败率)