一位70歲男性最近接受了永久性心臟心律調節器植入手術，以嚴厲糾正一個極度致命的第三度房室傳導阻滯。在他常規的術後遙測門診追蹤時，護理師沉重地仔細審視他的 12 導程心電圖數據。護理師敏銳地記錄到：畫面上出現了極具侵略性的規律、且輪廓極端清晰的電子『起搏尖峰 (pacer spikes)』，它們正精準地按照排程持續發射；然而，在這些銳利的尖釘之後，竟『完全沒有』緊隨出現任何的 QRS 複合波。個案緩慢地呻吟著他突然感到令人難以置信的頭暈且眼前發黑。這項特定的心電圖現象，究竟代表了哪一種確切、驚悚的「心律調節器-心肌」機制的生化學故障？
A 70-year-old male recently underwent surgical implantation of a permanent cardiac pacemaker to rigorously correct a deeply lethal third-degree atrioventricular (AV) block. During his routine post-operative telemetry clinic visit, the nurse heavily scrutinizes his 12-lead EKG readout. The nurse sharply documents that there are aggressively regular, sharply defined electronic "pacer spikes" continuously firing precisely on schedule; however, absolutely zero QRS complexes follow immediately after these sharp spikes. The client slowly groans that he suddenly feels incredibly dizzy and blacking out. What exact terrifying technical pacemaker-myocardial physiological failure does this specific EKG phenomenon represent?
- AFailure to pace, actively indicating the battery unit logic board has catastrophically died and completely stopped generating any electrical sparks whatsoever.無法起搏，明確表示電池單元的邏輯板已災難性損毀並完全停止產生任何電氣脈衝
- BFailure to capture, violently indicating the artificial electrical voltage is firing perfectly but failing brutally to actually force the heart muscle to depolarize.✓ 正解無法捕捉，強烈表示人工電氣電壓正在正常發放，但未能成功迫使心肌去極化
- CSuccessful absolute physiological hyper-capture, confirming the heart is beating so furiously fast and functionally efficiently that QRS waves naturally vanish into the baseline.成功的絕對生理過度捕捉，確認心臟跳動如此猛烈且功能高效，以致QRS波自然消失於基線中
- DFailure to sense, where the machine aggressively wildly ignores and fires over the client's own natural underlying heartbeats.無法感應，機器激烈地無視並覆蓋客戶自身的自然基礎心跳
本題測驗心臟血管系統的進階生理適應與重症儀器判讀：心律調節器異常。裝設心律調節器（Pacemaker）後，心電圖上會多出一根人工電流釘：『起搏尖峰 (Pacer spikes)』。這台機器最可怕的併發故障之一是「能放電、但心臟不鳥它」。當心電圖上「確實出現了一根根規律放電的釘子 (Spikes)，可是每一根釘子後面卻沒有帶出象徵心室收縮跳動的『QRS 複合波』」時，醫學上的正式術語稱這為一場災難：「無法捕捉 (Failure to Capture)」（選項B完美正解）。這通常是因為心臟肌肉裡的導線脫落、心臟組織因為水腫使得電組太大、或機器的電壓毫安培數太低，導致這股人工電流不足以『捕獲』心肌去發生收縮去極化。因此病患如同處於心跳停止的深淵，當然會開始頭暈眼前發黑。護理師必須立刻通知團隊來調高電壓。選項D（Failure to sense，感應失敗）是指機器瞎了，亂電一通跟病患自己的真本心跳撞在一起。選項A（Failure to pace，起搏失敗）是指電池沒電或完全壞死，連針尖 (spikes) 放電的影子都看不到，與題幹矛盾。選項C更是神話般的無聲心跳死亡理論。
This item assesses advanced cardiovascular physiology and critical-care device interpretation: pacemaker malfunction. After pacemaker implantation, additional artificial electrical signals known as pacer spikes appear on the ECG. One of the most concerning complications of this device is when it discharges but the heart fails to respond. When the ECG shows regular, well-defined spikes but no QRS complex (representing ventricular contraction) follows each spike, the formal medical term for this disaster is Failure to Capture (option B is the exact correct answer). This typically occurs because of lead dislodgement from the myocardium, increased electrical impedance from edematous tissue, or insufficient voltage/milliamperage from the device, leaving the artificial current too weak to capture the myocardium and depolarize it. The client effectively has no cardiac output and naturally becomes dizzy and presyncopal. The nurse must immediately notify the team to increase the voltage. Option D (Failure to Sense) means the device is "blind" and fires asynchronously, colliding with the client's own intrinsic beats. Option A (Failure to Pace) means the battery has died or the device has completely failed, so no spikes are visible at all, which contradicts the stem. Option C is an implausible "silent heartbeat" theory.
「Spike後面沒有QRST波 = Failure to Capture (無法捕獲)」。全世界心內科專科護理師或加護病房必背的經典 Pacemaker 判讀。只要遇到，馬上推急救車並 Call 醫生來調大機器伏特數 (mA)。