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C13呼气 - 版本历史
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2026年2月8日 (日) 12:37 103.220.218.7
2026-02-08T12:37:17Z
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">2026年2月8日 (日) 12:37的版本</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> <td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">2. 反应</td></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> <td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">2. 反应</td></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> <td style="padding: 10px; border: 1px solid #cbd5e1;">若胃内有 Hp，其分泌的<strong>尿素酶</strong><del class="diffchange diffchange-inline">会将尿素分解为</del><strong><del class="diffchange diffchange-inline">氨</del></strong><del class="diffchange diffchange-inline">和</del><strong><sup>13</sup>C-二氧化碳</strong<del class="diffchange diffchange-inline">>。</del></div></td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> <td style="padding: 10px; border: 1px solid #cbd5e1;">若胃内有 Hp，其分泌的<strong>尿素酶</strong><ins class="diffchange diffchange-inline">会将尿素分解。</ins></div></td></tr>
<tr><td class='diff-marker'>−</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del class="diffchange diffchange-inline"> <br>反应式：NH<sub>2</sub>-<sup>13</sup>CO-NH<sub>2</sub> + H<sub>2</sub>O $\xrightarrow{Urease}$ 2NH<sub>3</sub> + <sup>13</sup>CO<sub>2</sub</del>></td></div></td><td class='diff-marker'>+</td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline"> <br>反应式：尿素 + 水 → </ins><strong><ins class="diffchange diffchange-inline">(尿素酶)</ins></strong> <ins class="diffchange diffchange-inline">→ 氨 + </ins><strong><sup>13</sup>C-二氧化碳</strong></td></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> <td style="padding: 10px; border: 1px solid #cbd5e1;"><strong>这是关键。</strong> 没有 Hp，尿素不会被分解，直接从尿液排出。</td></div></td><td class='diff-marker'> </td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div> <td style="padding: 10px; border: 1px solid #cbd5e1;"><strong>这是关键。</strong> 没有 Hp，尿素不会被分解，直接从尿液排出。</td></div></td></tr>
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103.220.218.7
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103.220.218.6：建立内容为“<div style="padding: 0 4%; line-height: 1.8; color: #1e293b; font-family: 'Helvetica Neue', Helvetica, 'PingFang SC', Arial, sans-serif; background-color: #ffffff…”的新页面
2026-02-08T12:33:13Z
<p>建立内容为“<div style="padding: 0 4%; line-height: 1.8; color: #1e293b; font-family: 'Helvetica Neue', Helvetica, 'PingFang SC', Arial, sans-serif; background-color: #ffffff…”的新页面</p>
<p><b>新页面</b></p><div><div style="padding: 0 4%; line-height: 1.8; color: #1e293b; font-family: 'Helvetica Neue', Helvetica, 'PingFang SC', Arial, sans-serif; background-color: #ffffff; max-width: 1200px; margin: auto;"><br />
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<strong>C13呼气试验</strong>（<sup>13</sup>C-Urea Breath Test，简称 <strong><sup>13</sup>C-UBT</strong>），全称为<strong>碳-13尿素呼气试验</strong>。<br />
<br>这是目前临床检测<strong>[[幽门螺杆菌]]</strong>（<em>Helicobacter pylori</em>, Hp）现症感染的“金标准”方法。该技术利用了幽门螺杆菌产生<strong>尿素酶</strong>（Urease）的特性，通过分析受检者呼出气体中标记碳原子的比例来判断是否感染。<br />
<br>与 <strong>[[C14呼气]]</strong> 试验不同，碳-13（<sup>13</sup>C）是碳的一种<strong>稳定同位素</strong>，<strong>无放射性</strong>，对人体完全无害。因此，它是<strong>孕妇</strong>、<strong>儿童</strong>及体弱者筛查幽门螺杆菌的首选安全方案。<br />
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<div style="font-size: 1.2em; font-weight: bold; letter-spacing: 1.2px;"><sup>13</sup>C-UBT</div><br />
<div style="font-size: 0.7em; opacity: 0.85; margin-top: 4px; white-space: nowrap;">The Gold Standard for Hp (点击展开)</div><br />
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<div style="font-size: 0.8em; color: #64748b; margin-top: 12px; font-weight: 600;">吹两口气，知胃中菌</div><br />
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<th colspan="2" style="padding: 8px 12px; background-color: #e0f2fe; color: #1e40af; text-align: left; font-size: 0.9em; border-top: 1px solid #bae6fd;">技术档案</th><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0; width: 40%;">核心底物</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;"><sup>13</sup>C标记的尿素</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0;">同位素性质</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #1e40af;"><strong>稳定同位素 (无辐射)</strong></td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0;">检测仪器</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">红外光谱仪 / 质谱仪</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0;">灵敏度/特异性</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #16a34a;">> 95%</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0;">判读指标</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #0f172a;">DOB值 (超基线差值)</td><br />
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<th colspan="2" style="padding: 8px 12px; background-color: #e0f2fe; color: #1e40af; text-align: left; font-size: 0.9em; border-top: 1px solid #bae6fd;">临床优势</th><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0;">安全性</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #16a34a;">极高 (适合孕妇/儿童)</td><br />
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<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #1e40af;">无需插管 (胃镜)</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569; border-bottom: 1px solid #e2e8f0;">主要用途</th><br />
<td style="padding: 6px 12px; border-bottom: 1px solid #e2e8f0; color: #e11d48;">初筛 + 根除后复查</td><br />
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<th style="text-align: left; padding: 6px 12px; background-color: #f8fafc; color: #475569;">注意事项</th><br />
<td style="padding: 6px 12px; color: #0f172a;">需停药 (抗生素/PPI)</td><br />
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<h2 style="background: #f1f5f9; color: #0f172a; padding: 10px 18px; border-radius: 0 6px 6px 0; font-size: 1.25em; margin-top: 40px; border-left: 6px solid #0f172a; font-weight: bold;">生化原理：细菌的“分解术”</h2><br />
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人体胃内本身不产生尿素酶，只有幽门螺杆菌（Hp）能产生高活性的尿素酶。呼气试验正是利用了这一“独家特征”。<br />
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<th style="padding: 12px; border: 1px solid #cbd5e1; color: #0f172a; width: 15%;">步骤</th><br />
<th style="padding: 12px; border: 1px solid #cbd5e1; color: #1e40af; width: 45%;">反应过程</th><br />
<th style="padding: 12px; border: 1px solid #cbd5e1; color: #475569; width: 40%;">结果解读</th><br />
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<td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">1. 服用</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">受检者口服含有 <sup>13</sup>C 标记的尿素胶囊或试剂。</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">底物进入胃部。</td><br />
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<td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">2. 反应</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">若胃内有 Hp，其分泌的<strong>尿素酶</strong>会将尿素分解为<strong>氨</strong>和<strong><sup>13</sup>C-二氧化碳</strong>。<br />
<br>反应式：NH<sub>2</sub>-<sup>13</sup>CO-NH<sub>2</sub> + H<sub>2</sub>O $\xrightarrow{Urease}$ 2NH<sub>3</sub> + <sup>13</sup>CO<sub>2</sub></td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;"><strong>这是关键。</strong> 没有 Hp，尿素不会被分解，直接从尿液排出。</td><br />
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<td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">3. 呼出</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;"><sup>13</sup>CO<sub>2</sub> 穿过胃壁进入血液，经肺部循环，最终随呼吸排出体外。</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">收集受检者的呼气样本。</td><br />
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<td style="padding: 10px; border: 1px solid #cbd5e1; font-weight: 600;">4. 检测</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">仪器测量呼气中 <sup>13</sup>CO<sub>2</sub> 与正常 <sup>12</sup>CO<sub>2</sub> 的比例变化（DOB值）。</td><br />
<td style="padding: 10px; border: 1px solid #cbd5e1;">若 <strong>DOB ≥ 4.0</strong>，判定为阳性（感染）。</td><br />
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<h2 style="background: #f1f5f9; color: #0f172a; padding: 10px 18px; border-radius: 0 6px 6px 0; font-size: 1.25em; margin-top: 40px; border-left: 6px solid #0f172a; font-weight: bold;">C13 vs. C14：一字之差，天壤之别</h2><br />
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尽管两者原理相同，但在安全性上存在本质区别。选择哪一种，取决于受检者的身份。<br />
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<li style="margin-bottom: 12px;"><strong>C13 (高端/安全)：</strong> <br />
<br>• <strong>稳定同位素：</strong> 自然界中本身就存在，<strong>无放射性</strong>。<br />
<br>• <strong>适用：</strong> 所有人，特别是<strong>孕妇</strong>、<strong>哺乳期妇女</strong>、<strong>儿童</strong>。<br />
<br>• <strong>成本：</strong> 设备昂贵（需红外光谱或质谱），价格相对较高。</li><br />
<li style="margin-bottom: 0;"><strong>C14 (经济/受限)：</strong><br />
<br>• <strong>放射性同位素：</strong> 具有微量放射性（β射线）。虽然剂量极低（相当于吃几根香蕉），但在医学伦理上<strong>禁用于孕妇和儿童</strong>。<br />
<br>• <strong>适用：</strong> 普通成年人。<br />
<br>• <strong>成本：</strong> 仪器便宜，检测费用较低。</li><br />
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<span style="color: #0f172a; font-weight: bold; font-size: 1.05em; display: inline-block; margin-bottom: 15px;">关键相关概念 [Key Concepts]</span><br />
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<strong>1. Washout Period (药物清洗期)：</strong> 呼气试验最怕“假阴性”。以下药物会抑制 Hp 活性，导致检测不准，检查前必须停用：<br />
<br>• <strong>抗生素：</strong> 停药至少 <strong>4周</strong>。<br />
<br>• <strong>PPI (质子泵抑制剂) / 铋剂：</strong> 停药至少 <strong>2周</strong>。<br />
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<strong>2. DOB (Delta Over Baseline)：</strong> 检测结果的计量单位。指服用尿素后呼气中 <sup>13</sup>C 丰度相对于服用前基线的增加值。通常以 4.0 作为 Cut-off 值。<br />
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<strong>3. Eradication Confirmation (根除复查)：</strong> 服用“四联药物”杀菌治疗结束后，不能马上复查。必须等待<strong>至少 4 周</strong>（最好 6-8 周）再进行 C13 呼气试验，以确认细菌是被彻底“杀灭”了，而不仅仅是被“抑制”了。<br />
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<span style="color: #0f172a; font-weight: bold; font-size: 1.05em; display: inline-block; margin-bottom: 15px;">学术参考文献 [Academic Review]</span><br />
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[1] <strong>Malfertheiner P, et al. (2017).</strong> <em>Management of Helicobacter pylori infection—the Maastricht V/Florence Consensus Report.</em> <strong>[[Gut]]</strong>. <br><br />
<span style="color: #475569;">[点评]：全球 Hp 诊治的最高指南（马斯特里赫特共识）。明确推荐 <sup>13</sup>C-UBT 为“检测和治疗”策略中的首选非侵入性检测方法。</span><br />
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[2] <strong>Gisbert JP, et al. (2004).</strong> <em>The urea breath test for the diagnosis of Helicobacter pylori infection: a systematic review and meta-analysis.</em> <strong>[[Helicobacter]]</strong>. <br><br />
<span style="color: #475569;">[点评]：系统综述。证实了 UBT 的敏感性和特异性均超过 95%，且不受胃内病变分布呈灶状（Patchy）的影响，优于胃镜活检的取样误差。</span><br />
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消化内科 · 知识图谱<br />
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<td style="width: 85px; background-color: #f8fafc; color: #334155; font-weight: 600; padding: 10px 12px; text-align: right; vertical-align: middle;">上级分类</td><br />
<td style="padding: 10px 15px; color: #334155;">[[无创筛查]] • 呼气检测</td><br />
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<td style="width: 85px; background-color: #f8fafc; color: #334155; font-weight: 600; padding: 10px 12px; text-align: right; vertical-align: middle;">竞品对比</td><br />
<td style="padding: 10px 15px; color: #334155;">[[C14呼气]] (有辐射) • [[快速尿素酶试验]] (RUT, 有创) • [[粪便抗原]]</td><br />
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<td style="width: 85px; background-color: #f8fafc; color: #334155; font-weight: 600; padding: 10px 12px; text-align: right; vertical-align: middle;">关联疾病</td><br />
<td style="padding: 10px 15px; color: #334155;">[[幽门螺杆菌]] • [[胃炎]] • [[胃癌]]</td><br />
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