一位78歲男性抵達混亂的急診室，猛烈地抱怨只要他一躺平就有一股極度恐懼的無法呼吸感（端坐呼吸），以及經常在半夜因為要大口喘氣而突然驚醒（陣發性夜間呼吸困難）。檢傷分類護士觀察到他雙側腳踝有著具標誌性的凹陷性水腫，以及其脖子上顯著鼓起的頸靜脈。為了完美且在生化層面上區分他嚴重的呼吸窘迫到底是因為急性的心臟衰竭惡化，還是單純的肺部感染，醫療提供者必須立刻評估哪一項特定的血清實驗室數值？
A 78-year-old male arrives at the chaotic emergency department fiercely complaining of a terrifying inability to breathe whenever he lies flat (orthopnea) and frequent sudden awakenings gasping for air at night (paroxysmal nocturnal dyspnea). The triage nurse observes marked pitting edema in both ankles and prominently distended jugular veins in his neck. To flawlessly and biochemically differentiate if his severe respiratory distress is fiercely being driven by an acute Heart Failure exacerbation rather than a pulmonary infection, which specific serum laboratory blood value must the provider immediately evaluate?
- AD-dimer level, to undeniably verify that his heart failure is being solely caused by a monstrous bleeding ulcer.D-dimer 數值，以無可辯駁地證實其心臟衰竭完全是由嚴重的出血性潰瘍引起。
- BTroponin I, to meticulously calculate the exact size of his failing lung cavities.Troponin I，以精確計算其衰竭肺腔的確切大小。
- CCreatine Kinase (CK-MB), which uniquely confirms the aggressive onslaught of chronic asthma attacks.Creatine Kinase (CK-MB)，其獨特地確認了慢性氣喘發作的侵略性攻擊。
- DB-type Natriuretic Peptide (BNP), which explosively elevates precisely when the overloaded heart ventricles forcefully over-stretch.B型利鈉肽（BNP），其在超載的心室心腔被迫過度伸展時會急遽升高。正確答案
- DB型利鈉肽（BNP），其在超載的心室心腔被迫過度伸展時會急遽升高。
本題測驗以實驗室數值鑑別呼吸困難的成因。急診病人主訴喘時，區分為心因性（心衰竭導致肺水腫）或肺因性（肺炎、COPD、氣喘）會直接改變後續處置方向。B型利鈉胜肽（B-type Natriuretic Peptide, BNP）由心室肌細胞在容積負荷過重、心室壁受到牽張時分泌，具有排鈉利尿與血管擴張作用。題幹的端坐呼吸、陣發性夜間呼吸困難、雙側凹陷性水腫與頸靜脈怒張皆屬容積過載的表現；此時BNP升高（一般以100 pg/mL為切點，數值愈高愈支持心因性）即支持心衰竭急性惡化，數值正常則有助於排除心因性、將診斷導向肺部感染，故選項D為正解。選項B的肌鈣蛋白I是心肌細胞損傷壞死的標記，用於診斷急性心肌梗塞，不能用來評估心室或肺部的容積。選項C的CK-MB同為心肌損傷指標（現多由高敏感度肌鈣蛋白取代），與氣喘無關。選項A的D-dimer是纖維蛋白降解產物，臨床上用於低風險族群排除深層靜脈栓塞與肺栓塞，與消化性潰瘍出血無關。
- AD-dimer 數值，以無可辯駁地證實其心臟衰竭完全是由嚴重的出血性潰瘍引起。
D-dimer 強烈追蹤著病理性血塊（如肺栓塞）的劇烈降解，這與調查正在流血的腸胃道潰瘍完全相反。
- BTroponin I，以精確計算其衰竭肺腔的確切大小。
肌鈣蛋白是偵測急性心肌梗塞（心臟組織壞死）的終極生物標記，它缺乏機械能力去計算內部肺臟大小或是精準定位體液負荷過度。
- CCreatine Kinase (CK-MB)，其獨特地確認了慢性氣喘發作的侵略性攻擊。
CK-MB 傳統上被利用於追蹤心臟肌肉損傷，與追蹤氣喘的支氣管痙攣有著完全為零的科學交集。
- D · 正確答案B型利鈉肽（BNP），其在超載的心室心腔被迫過度伸展時會急遽升高。
BNP 是心臟衰竭絕對黃金標準的血液測試；當疲憊不堪的心室被過量體液危險地過度充填與拉伸時，它們會獨家分泌出巨量的這種胜肽。
「喘病患驗 BNP = 抓心臟衰竭積水 (Heart Failure)」。這是台灣急診與美國急診最日常的基本直覺，不分國界。
English explanation
This question tests one of the most powerful differential laboratory indicators in acute internal medicine (Reduction of risk: lab values). When a patient presents to the ED with dyspnea, distinguishing 'cardiac' (heart failure with pulmonary edema) from 'pulmonary' (such as COPD, pneumonia, or asthma) is a life-or-death decision point. B-type Natriuretic Peptide (BNP) is an endocrine 'distress' hormone uniquely released by ventricular myocardium in response to severe volume overload and excessive stretching (such as fluid backup from heart failure). The normal value is usually < 100 pg/mL. With acute exacerbation of heart failure, BNP can soar into the hundreds or thousands, making it unmistakable evidence of heart failure exacerbation (Option D is the correct answer). Option B, troponin I, is a marker of acute myocardial infarction (released when cells die) and is not used to evaluate heart failure with fluid overload. Option C, CK-MB, is also an older marker for myocardial infarction and has no relationship to asthma. Option A, A-dimer, is used to rule out deep vein thrombosis or massive pulmonary embolism and has nothing to do with bleeding ulcers.
最近修訂：2026-05-17