# A nurse is caring for a patient in cardiogenic shock who has an intra-aortic balloon pump in place. Which action should the nurse prioritize? > source: MyMerci (mymerci.kr) > url: https://mymerci.kr/pages/nclex_q.php?qn_id=540277 > language: ko > subject: Adult Health ## 문제 A nurse is caring for a patient in cardiogenic shock who has an intra-aortic balloon pump in place. Which action should the nurse prioritize? ## 보기 1. Increase the IABP frequency to 1:1 ratio and monitor for improved cardiac output 2. Administer prescribed inotropic agents and closely monitor hemodynamic response **✔ 정답** 3. Position the patient in Trendelenburg position to improve venous return 4. Increase fluid administration to improve preload and cardiac output **정답: 2** ## 해설 In cardiogenic shock with low CI, high PAWP, and high SVR, inotropic agents are priority to improve contractility. IABP optimization is secondary, while fluid administration and Trendelenburg position are contraindicated due to high PAWP. ## 심화 해설 Understanding the Priority in Cardiogenic Shock with IABP The core of this question lies in recognizing the primary physiological problem in cardiogenic shock and the nurse's priority action when a mechanical support device like an intra-aortic balloon pump (IABP) is already in place. Cardiogenic shock is a state of pump failure where the heart cannot deliver sufficient oxygenated blood to meet the body's demands, leading to tissue hypoperfusion. The IABP is a supportive device that reduces afterload and augments diastolic coronary perfusion, but it does not directly fix the underlying problem of a failing myocardium. Why Option 2 is the Priority Administering prescribed inotropic agents and closely monitoring the hemodynamic response is the correct priority. Inotropes like dobutamine or milrinone directly increase myocardial contractility, which is the fundamental deficit in cardiogenic shock. The provided evidence emphasizes the use of continuous arterial dP/dt pressure waveform analysis (PWA) to guide real-time management of inotropic support [1]. dP/dt, the rate of ventricular pressure rise during systole, is a sensitive marker of myocardial contractility [1]. This technology allows the nurse to titrate inotropic therapy precisely, observing the direct effect on cardiac function at the bedside. The priority is to pharmacologically improve the pump function while using advanced monitoring to assess the patient's response, a task that falls directly within the nursing scope for continuous assessment and titration of critical drips. Analysis of Incorrect Options Option 1: Increase the IABP frequency to 1:1 ratio While a 1:1 ratio (augmentation with every cardiac cycle) provides maximal support, adjusting this setting is typically a physician or advanced practice provider function based on a comprehensive assessment, not an independent nursing action. Furthermore, the IABP is already in place and functioning; the immediate priority is to address the pump failure itself with inotropes, using the IABP as a bridge to support that therapy. The nurse's role involves monitoring the IABP's timing and the patient's response, not independently changing the augmentation ratio. Option 3: Position the patient in Trendelenburg position This position is contraindicated in cardiogenic shock. Placing the patient's head down increases venous return (preload) to a heart that is already failing to pump effectively. This can lead to pulmonary congestion, worsening oxygenation, and increased myocardial oxygen demand without improving cardiac output. The failing ventricle is volume-sensitive and cannot handle a sudden increase in preload. The head of the bed should be elevated to reduce the work of breathing and optimize oxygenation, unless contraindicated by the IABP insertion site and hemodynamic instability. Option 4: Increase fluid administration to improve preload This is a dangerous action in cardiogenic shock without a clear indication of hypovolemia. The primary problem is not a lack of volume but a failure of the pump. Aggressive fluid resuscitation will increase preload, which the failing left ventricle cannot eject, leading to fluid backing up into the pulmonary circulation and causing acute pulmonary edema. Fluid management in cardiogenic shock is extremely delicate and requires assessment of volume status, often with a conservative approach. The priority is to improve contractility, not to add volume that the heart cannot handle. The new monitoring technology mentioned in the evidence, which derives dP/dt from arterial waveforms, is also sensitive to preload and afterload changes, highlighting the complexity of managing these variables [1].References (research sources) - [1]Using dP/dt Contour Analysis to Wean IABP/Inotropic Support in a Cardiogenic Shock Patient.Research articleKapadia KN, Chow N, Mcwhorter YS. (2025) · DOI: 10.1016/j.jaccas.2025.105786 ## 임상 시나리오 IABP & Inotrope Management in Cardiogenic ShockPrioritizing Pharmacological Support for the Failing Pump The priority for a patient in cardiogenic shock with an IABP is to administer prescribed inotropic agents like dobutamine. The IABP provides mechanical support, but inotropes directly treat the underlying myocardial contractility failure. Titrate inotropes based on real-time hemodynamic monitoring. Use markers like continuous arterial dP/dt to assess the drug's effect on contractility at the bedside, aiming to optimize cardiac output without excessive myocardial oxygen demand. CautionDo not independently adjust IABP settings; the frequency and timing are prescribed. Avoid Trendelenburg positioning and aggressive fluid boluses, as they increase preload on a failing pump and can precipitate pulmonary edema. ## 핵심 개념 - **Cardiogenic Shock** — A life-threatening condition in which the heart's pumping function is impaired, preventing it from maintaining adequate cardiac output and tissue perfusion. Major causes include myocardial infarction, myocarditis, and heart valve disease. - **Intra-Aortic Balloon Pump** — This is a mechanical assist device where a balloon catheter is inserted into the aorta, inflating the balloon during diastole to increase coronary artery perfusion and deflating it during systole to reduce afterload. - **Inotropic Agents** — This is a drug that increases myocardial contractility. Examples include dobutamine (primarily β1 action) and milrinone (a phosphodiesterase inhibitor), and it is used to improve low cardiac output in cardiogenic shock. - **Pulmonary Artery Wedge Pressure** — Pressure measured through a pulmonary artery catheter, indirectly reflecting left atrial pressure. When elevated (>18 mmHg), it suggests increased left ventricular filling pressure or left ventricular dysfunction. - **Systemic Vascular Resistance** — It is a hemodynamic indicator that represents the resistance of the systemic vascular system. 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