脊髓損傷的自主神經反射異常¶

自主神經反射異常 (AD) 也稱為自主神經反射亢進，是一種危及生命的急性高血壓醫療緊急情況，影響第六胸椎或以上（T6 級及以上，包括所有頸椎四肢癱瘓/四肢癱瘓和高位胸椎截癱）的脊髓損傷 (SCI) 患者。由損傷平面以下的疼痛或刺激性刺激觸發，最常見的是膀胱過滿、導尿管扭結或堵塞，或嚴重的腸便秘，下脊髓會發出不受控制的交感神經反射，收縮腹部和腿部血管。血壓在幾分鐘內飆升20至40毫米汞柱或高於人的低基線（通常達到\(180\text{至}300\text{mmHg}\)收縮壓），導致突然劇烈頭痛、受傷處大量出汗、危險的心臟減慢（心動過緩）、癲癇發作、出血性中風、視網膜出血、心肌梗塞，如果不控制血壓（心動過緩）、癲癇發作、出血性中風、視網膜出血、心肌梗塞，如果不控制血壓

現在就這樣做¶

1. **讓患者以 90 度角坐直，並將雙腿垂下。 ** 如果患者躺在床上，請將床頭抬高至 90 度，並將雙腿放在床墊一側；如果他們乘坐可躺式電動輪椅，請將座椅完全傾斜並放下腿托。重力導致癱瘓下半身的血液直立性​​匯集，並提供最快的非藥物血壓下降。
2. **鬆開或脫掉所有緊身衣服、束帶、帶子和壓力襪。 ** 立即解開腹部束帶、胸帶、緊腰帶、鞋帶、腿袋帶、保險套導尿管和緊身褲，並脫掉彈性壓力襪（TED 軟管）。消除外部壓力可以擴大腹部和腿部的靜脈容量，並消除皮膚壓力觸發因素。
3. **每 2 至 5 分鐘檢查一次血壓，並識別較低的 SCI 基線。 ** 頸椎或高胸四肢癱瘓/截癱患者的正常靜止收縮壓自然較低，成人通常為 \(90\text{ 至 }110\text{ mmHg}\)。因此，血壓讀數為 \(120/80\text{ mmHg}\) 或 \(130/85\text{ mmHg}\)（對於未經培訓的護士或護理人員來說，這看起來完全“正常”）代表危險的 \(20\text{ 到 }40\text{ mmHg}\) 高血壓激增，並證實異常高血壓。
4. **首先檢查膀胱和泌尿系統（佔所有病例的 75% 到 85%）。 ** 如果患者留置了弗利導尿管或恥骨上導尿管，請立即追蹤從身體到收集袋的管道：解開任何扭曲的管道，提起引流環，使尿液向下流，鬆開緊的腿袋帶，並清空過滿的袋子。如果 2 至 3 分鐘內沒有尿液流過導管，請用 10 至 15 毫升（0.3 至 0.5 液量盎司） 室溫無菌生理食鹽水（如果經過訓練）輕輕沖洗（切切或使用冷水），或 **拔除堵塞的導管並立即插入新的導管，使用 2% 用力沖洗或使用冷水），或 **拔除堵塞的導管並立即插入新的導管如果患者進行間歇性導尿，請立即對膀胱進行導尿。
5. 如果膀胱排空且血壓仍然很高（\(>150\text{ mmHg}\) 收縮壓），請其次檢查腸道。 ** 糞便嵌塞（便秘）是自主神經反射異常的第二個最常見原因。 立即停止任何主動排便計劃或直腸數字刺激。 ** 在用戴手套的手指檢查直腸之前，如果血壓等於或高於 \(150\text{ mmHg}\) 收縮壓，請撥打您當地的緊急電話號碼（美國和加拿大為 911，歐盟為 112，英國為 999，或查看所有 緊急號碼）並給予患者處方的速效口服或外用抗高血壓藥物（例如舌下含服/咀嚼硝苯地平、卡托普利或外用硝酸甘油糊劑，僅在確認未使用西地那非/偉哥後）。將2% 利多卡因麻醉凝膠插入直腸後等待 5 分鐘，然後輕輕清除任何糞便，以避免惡化反射。
6. **第三步驟檢查皮膚和四肢，如果症狀持續或血壓保持 \(\ge 150\text{ mmHg}\)，請致電 911 / 112 / 999。 ** 如果膀胱和腸道都暢通無阻，請檢查損傷平面以下是否有隱藏的疼痛觸發因素：坐在錢包、電話、導管瓣膜或硬輪椅接縫上；腳趾甲向內生長；壓瘡（褥瘡）；曬傷或燙傷；隱藏的腿骨骨折；或月經痙攣/分娩。如果您找不到觸發因素、收縮壓保持在 \(150\text{ mmHg}\) 或以上，或者劇烈頭痛、視力變化、胸痛或意識模糊持續存在，請立即致電緊急醫療服務。

自主神經反射異常臨床分流與逐步解決流程圖¶

按照從上到下的確切順序遵循美國癱瘓退伍軍人 (PVA) 和國際脊髓協會 (ISCoS) 的臨床演算法。

flowchart TD
    Start["T6 或以上脊髓損傷的人會出現：<br/>劇烈頭痛、損傷上方出汗/潮紅、<br/>損傷下方起雞皮疙瘩/皮膚冰冷蒼白，或鼻塞"] --> Step1SitUp["步驟 1：姿勢和服裝幹預<br/>1. 使人以 90 度直坐；小腿朝下<br/>2.鬆開所有腰帶、腹部綁帶、腿帶和緊身衣服<br/>3。脫下壓力襪（TED 軟管）<br/>4。每 2 至 5 分鐘檢查一次血壓（AD = 高於基線 >= 20 mmHg）"]

    Step1SitUp --> Step2Bladder{"步驟 2：首先檢查膀胱（85% 的病例）<br/>病人是否留置<br/>Foley 或恥骨上導管？"}

    Step2Bladder -->|"無需留置導尿管"| IntermittentCath["立即進行間歇導尿：<br/>先將2%利多卡因麻醉凝膠滴入尿道（等待2分鐘）<br/>完全排空膀胱；監測血壓是否突然下降"]

    Step2Bladder -->|"是：存在留置導管"| CheckTubing{"管道是否扭結、夾緊，<br/>或袋子是否過滿？"}
    CheckTubing -->|"是：扭結或完整"| UnkinkBag["解開管道，打開夾子，將袋子降低到膀胱水平以下，<br/>並清空收集袋。接下來 5 分鐘觀察血壓。"]
    CheckTubing -->|"否：管道直，但阻塞/無流量"| ReplaceFoley["請勿將大量液體推入阻塞的膀胱。 <br/>取出阻塞的導管並使用 2% 利多卡因凝膠插入新的導管<br/>（僅在經過培訓的情況下可選用 10 至 15 mL 室溫鹽水進行溫和沖洗）"]

    IntermittentCath --> BPCheckAfterBladder{"收縮壓是否降至<br/>150 mmHg 以下且頭痛是否緩解？"}
    UnkinkBag --> BPCheckAfterBladder
    ReplaceFoley --> BPCheckAfterBladder

    BPCheckAfterBladder -->|"是：已解決"| Monitor2Hrs["繼續每 15 至 30 分鐘監測一次血壓和症狀，持續 2 小時<br/>觀察反跳性低血壓或復發性 AD"]

    BPCheckAfterBladder -->|"否：血壓仍然升高"| Step3BPThreshold{"步驟 3：腸道檢查前檢查收縮壓<br/>收縮壓是否 >= 150 mmHg（成人）？"}

    Step3BPThreshold -->|"是：收縮壓 >= 150 mmHg"| MedAndEMS["1. 立即撥打911 / 112 / 999<br/>2.給予病人處方速效抗高血壓藥物<br/>（例如卡托普利 25 mg、硝苯地平 10 mg 或 2% 硝酸甘油糊劑<br/> 僅在確認未使用西地那非/他達拉非 PDE5 抑製劑<br/> 僅在確認未使用西地那非/他達拉非 PDE5 抑製劑 <br/>分鐘後再檢查腸道"]

    Step3BPThreshold -->|"否：收縮壓 < 150 mmHg"| Step4Bowel["步驟 4：檢查腸道是否有糞便嵌塞<br/>1.將大量 2% 利多卡因麻醉凝膠注入直腸<br/>2.等待 5 分鐘，直腸麻木<br/>3。用潤滑的戴手套的手指輕輕檢查直腸並清除糞便<br/>（如果在數字檢查期間血壓升高，請立即停止）"]

    MedAndEMS --> Step4Bowel
    Step4Bowel --> Step5Skin["步驟 5：檢查皮膚、指甲和其他受傷以下的觸發因素<br/>檢查臀部下是否有硬物、壓瘡、內嵌的腳趾甲、<br/>鞋子過緊、燒傷、骨折、泌尿道感染或分娩。 <br/>如果 AD 持續存在或血壓 >= 150 mmHg，則送往急診室。"]

病理生理學：為什麼 T6 是關鍵的解剖分界線¶

了解為什麼自主神經反射異常僅發生在T6（第六胸椎）脊髓節段（偶爾是 T7 至 T8）或以上的脊髓損傷中，使得緊急方案的每一步都合乎邏輯。

1. 疼痛或有害刺激發生在脊髓損傷下方：儘管患者無法有意識地感受到脊髓損傷下方膀胱擴張或腳趾甲內生帶來的疼痛，但完整的感覺疼痛和來自膀胱、腸或皮膚的牽拉神經仍然將緊急求救信號傳遞到下脊髓。
2. 大量內臟交感神經流出（T5 至 L2）：一旦求救訊號進入損傷下方的脊髓，它就會向上傳播，直到到達脊髓疤痕/橫斷面。由於無法乾淨地傳遞到大腦，此訊號會觸發穿過胸腰交感鏈（T5 至 L2）的大規模、不受抑制的交感脊髓反射。至關重要的是，大內臟神經從 T5 到 T9 出現，並控制內臟血管床（胃、腸、肝、脾和腎中的巨大血管網絡，約佔人體總血量的 25% 到 30%）。
3. 為什麼T6以上會造成失控的血壓危機：當病灶處於T6或更高時，大腦的下行鎮靜（抑制）訊號無法穿過脊髓損傷到達T5至T9內臟神經。內臟血管和下半身動脈劇烈收縮，在幾秒鐘內將一公升以上的血液向上擠壓到胸部、頸部和大腦，使收縮壓升高 \(40\text{ 至}150+\text{ mmHg}\)。 （相較之下，如果一個人的損傷位於 T10 或 L1，他們的大腦保留對 T5 至 T9 內臟床的正常控制，並且可以擴張腹部血管以預防高血壓）。
4. 分體悖論（下方血管收縮，上方血管舒張和心搏過緩）：
5. 受傷上方：頸動脈竇和主動脈弓壓力感受器感知到危險的血壓峰值並向腦幹發出警報。腦幹發出兩個緊急訊號：首先，它會激發迷走神經（腦神經X），該神經從脊髓外部直接到達心臟，以減慢心率（反射性心動過緩，通常為\(40\text{至}55\text{每分鐘心跳數}\)，儘管有些患者表現出心動過速或心律失常）；其次，它會擴張血管並激活完好脊柱節段損傷水平上方的汗腺，導致血管性頭痛、面部和頸部呈鮮紅色、額頭/肩部大量出汗以及鼻塞。
6. 受傷部位下方：由於腦幹的鎮靜訊號在脊髓病變處被阻斷，下半身仍處於極度交感血管收縮狀態，顯得蒼白、寒冷、濕冷、渾身起雞皮疙瘩（立毛）。

辨識自主神經反射異常：基線血壓與危機數字¶

急診室中最致命的醫療錯誤之一發生在分診護士或護理人員測量四肢癱瘓患者的血壓為 \(135/85\text{ mmHg}\) 時，宣稱“您的血壓完全正常”*，並忽略了危及生命的自主神經反射異常危機。

由於頸椎或高胸段脊髓損傷的人缺乏基線交感血管張力，因此他們的正常靜止血壓是神經源性低血壓。使用此參考表按年齡組準確解釋血壓（基於脊髓醫學聯盟/美國癱瘓退伍軍人指南）：

Classic signs and symptoms above and below the level of injury¶

• Sudden, severe pounding headache (bifrontal or occipital): Feels like a jackhammer inside the skull as cerebral arteries stretch under high pressure.
• Profuse sweating (diaphoresis) above the level of injury: Sweat pours down the forehead, face, neck, and upper shoulders while the lower body stays bone-dry.
• Red blotchy skin flushing (erythema) above the level of injury: Bright red patches across the face, neck, and upper chest.
• Cold, pale, clammy skin and goosebumps (cutis anserina / piloerection) below the level of injury (and sometimes across the arms in high cervical injuries).
• Sudden nasal congestion (stuffy nose): Caused by parasympathetic vasodilation of the nasal mucosa.
• Visual disturbances: Blurred vision, seeing spots (scotomata), or sensitivity to light.
• Cardiac symptoms: A slow, heavy pounding pulse in the neck (bradycardia below 60 beats per minute) or sudden irregular heartbeats, chest tightness, and overwhelming anxiety or a feeling of impending doom.
• "Silent" Autonomic Dysreflexia: Up to 30 to 40 percent of documented blood pressure spikes during urodynamic testing or bowel care occur with minimal or zero headache, meaning caregivers should check blood pressure whenever a patient shows unexplained facial flushing, sweating, or increased muscle spasms (spasticity).

Comprehensive checklist of autonomic dysreflexia triggers (The 3 Bs: Bladder, Bowel, Body)¶

When hunting for the cause of an autonomic dysreflexia episode, never search at random. Work systematically through the Bladder (75% to 85% of all cases), then the Bowel (10% to 15% of cases), and finally the Skin/Body (5% to 10% of cases).

Detailed urinary catheter troubleshooting without worsening the crisis¶

Because roughly 4 out of 5 autonomic dysreflexia episodes stem from the bladder, knowing what not to do with a urinary catheter is just as important as knowing what to do:

1. Never forcefully irrigate or syringe more than 10 to 15 milliliters (0.3 to 0.5 fluid ounces) into a distended bladder: If a patient's bladder is already stretched with 600 milliliters of trapped urine and you forcefully push 50 milliliters of saline through a blocked Foley catheter, you stretch the bladder wall even further and trigger an instant, massive surge in blood pressure. If a gentle 10 to 15 milliliter room-temperature sterile normal saline flush does not immediately restore free drainage, stop flushing, deflate the balloon, remove the blocked catheter, and insert a brand-new catheter.
2. Always use room-temperature (or body-temperature) saline, never cold liquid: Cold fluid touching the bladder urothelium stimulates cold-receptor C-fibers and can trigger or worsen autonomic dysreflexia.
3. Instill intra-urethral 2% lidocaine (lignocaine) anesthetic gel before catheterizing: Before inserting a replacement Foley catheter or an intermittent catheter during an active AD crisis, squeeze 5 to 10 milliliters of sterile 2% lidocaine hydrochloride jelly into the urethra and wait 2 minutes if possible. The local anesthetic numbs the urethral sphincter and prevents the mechanical act of passing the catheter from causing a secondary blood pressure spike.
4. Watch for post-decompression hypotension and hematuria: Once a severely distended bladder is drained, the reflex vasoconstriction stops abruptly. Combined with the patient sitting upright at 90 degrees (and especially if they also took a blood pressure pill), blood pressure can suddenly plummet below \(70/40\text{ mmHg}\), causing dizziness or fainting. As soon as urine flows freely and systolic blood pressure drops back toward the patient's normal baseline (\(90\text{ to }110\text{ mmHg}\)), you can recline the backrest slightly to 30 or 45 degrees while monitoring blood pressure every 10 to 15 minutes for at least 2 hours.

血壓達到150毫米汞柱時的緊急藥物管理¶

如果讓患者坐直、寬鬆衣服並排空膀胱不會使收縮壓低於 \(150\text{ mmHg}\)，或者如果在嘗試緩解便秘腸道之前收縮壓為 \(150\text{ mmHg}\) 或更高，脊髓醫學聯盟 (PVA) 和國際脊髓協會的臨床實踐指南建議快速起效、患者已為其家庭抗血**

• Topical 2% Nitroglycerin Ointment (Nitro Paste): Typically applied as a 2.5 to 5 centimeter (1 to 2 inch) strip on the skin above the level of the spinal cord injury (such as the upper chest or forehead, where blood vessels are not constricted). Its major safety advantage for home caregivers is that as soon as the bladder or bowel trigger is relieved and blood pressure begins dropping, you can immediately wipe the nitroglycerin paste off the skin with a tissue and soap/water to stop further drug absorption and prevent rebound hypotension. (Strictly contraindicated if sildenafil/vardenafil was used within 24 hours or tadalafil within 48 hours).
• Oral Captopril: Typically \(25\text{ milligrams}\) placed under the tongue (sublingually) or chewed and swallowed. Captopril is an ACE inhibitor that begins lowering blood pressure within 15 to 30 minutes without the PDE5 inhibitor contraindication of nitrates, making it a first-line choice in many North American and European spinal centers.
• Immediate-Release Nifedipine: Historically used as \(10\text{ milligrams}\) capsule bitten and swallowed (note: many modern guidelines prefer captopril or topical nitrates first because immediate-release nifedipine can occasionally cause a steep, non-reversible blood pressure drop after the bladder is drained, though it remains widely carried in patient emergency kits).

Advocating with paramedics and emergency room staff: The AD Wallet Card¶

Because autonomic dysreflexia is unique to spinal cord injuries above T6, general paramedics and emergency room triage staff who do not specialize in neurotrauma frequently make three dangerous mistakes: 1. They try to lay the patient flat on the ambulance stretcher (which spikes brain blood pressure). 2. They see a blood pressure of \(135/85\text{ mmHg}\) and dismiss the patient's pounding headache as a "migraine" because they do not know that a tetraplegic patient's normal blood pressure is \(90/60\text{ mmHg}\). 3. They give long-acting intravenous antihypertensives without first checking for a blocked catheter or impacted bowel, causing hours of severe hypotension once the catheter is finally unblocked.

Every person with an SCI at T6 or above should carry a laminated Autonomic Dysreflexia Medical Alert Wallet Card (available from the Christopher & Dana Reeve Foundation, Paralyzed Veterans of America, Spinal Injuries Association UK, and Spinal Cord Injury Canada) clipped to their wheelchair bag and stored on their phone lock screen, and caregivers should hand it directly to the lead paramedic and triage physician.

常見問題¶

來源已檢查¶

• Consortium for Spinal Cord Medicine and Paralyzed Veterans of America (PVA, United States): Clinical Practice Guideline: Evaluation and Management of Autonomic Dysreflexia and Other Autonomic Dysfunctions: Preventing the Highs and Lows (2020/2021 edition).
• International Spinal Cord Society (ISCoS) and American Spinal Injury Association (ASIA): International Standards to Document Autonomic Function Following Spinal Cord Injury (ISAFSCI) and acute emergency management protocols.
• National Health Service (NHS, United Kingdom), Spinal Injuries Association (SIA, United Kingdom), and Royal College of Physicians (United Kingdom): Chronic Spinal Cord Injury: Management of Patients in Acute Hospital Settings and Emergency Treatment of Autonomic Dysreflexia.
• Christopher & Dana Reeve Foundation Paralysis Resource Center (United States) and Spinal Cord Injury Model Systems (SCIMS, United States): Autonomic Dysreflexia Consumer and Emergency Medical Services (EMS) Wallet Card Guidelines.

相關指南¶

• Spinal injuries: neck and back stabilization
• Stroke recognition (FAST) and emergency response
• Seizures first aid and management
• Disabilities and medical needs emergency planning
• 緊急號碼和國際調度