# A nurse is caring for a patient in cardiogenic shock following acute myocardial infarction. Which nursing intervention should be the highest priority?

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## 문제

A nurse is caring for a patient in cardiogenic shock following acute myocardial infarction. Which nursing intervention should be the highest priority?

## 보기

1. Administer high-flow oxygen via non-rebreather mask to maintain oxygen saturation
2. Insert a urinary catheter to monitor hourly urine output and renal perfusion
3. Prepare for immediate fluid resuscitation with normal saline to increase preload
4. Position the patient in modified Trendelenburg and prepare for hemodynamic monitoring **✔ 정답**

**정답: 4**

## 해설

In cardiogenic shock, optimizing venous return without excessive preload (via modified Trendelenburg) and initiating hemodynamic monitoring are immediate priorities to guide therapy. Other options address supportive care but do not directly manage the compromised cardiac output.

## 심화 해설

Understanding Cardiogenic Shock After Myocardial Infarction

Cardiogenic shock is a state of profound tissue hypoperfusion resulting from the heart’s inability to pump effectively. In the context of an acute myocardial infarction (MI), this often stems from extensive left ventricular damage or a catastrophic mechanical complication. The provided case studies highlight three such structural failures: ventricular septal rupture (VSR) [1], papillary muscle rupture leading to acute mitral regurgitation [2], and left main spontaneous coronary artery dissection (SCAD) [3]. In all these scenarios, the central hemodynamic problem is a critical loss of forward flow, not primarily a volume deficit or a simple oxygenation issue.

Why Option 4 is the Highest Priority

The immediate priority for a nurse is to support the patient's hemodynamic status and facilitate definitive diagnosis and therapy. Positioning the patient appropriately and preparing for hemodynamic monitoring directly addresses this.

- Positioning and Preload Optimization: The modified Trendelenburg position (lying flat with legs elevated) is a temporary measure to promote venous return and augment preload in a profoundly hypotensive patient. While fluid resuscitation (Option 3) might seem logical, in cardiogenic shock—especially when caused by a mechanical complication like VSR or acute mitral regurgitation—aggressive volume loading can be catastrophic. It can worsen pulmonary edema and further distend the failing ventricle, increasing wall stress and oxygen demand without improving forward output. The case of VSR management explicitly describes a state of "refractory shock" requiring mechanical support, not just fluids [1].

- Facilitating Definitive Diagnosis: The case studies universally emphasize the critical role of invasive hemodynamic monitoring. For instance, in the SCAD case, "Catheterization with pulmonary artery catheter placement was crucial in revealing left main SCAD with severe cardiogenic shock" [3]. This monitoring provides real-time data on cardiac filling pressures, cardiac output, and systemic vascular resistance, which are essential to differentiate cardiogenic shock from other shock states and to guide the use of vasopressors and mechanical circulatory support (MCS). The nurse’s preparation for this monitoring is a direct step toward life-saving interventions like Impella or VA-ECMO, which are now central to managing refractory shock [2][3].

Analysis of Other Options

| Option | Rationale for Lower Priority |

| :--- | :--- |

| 1. Administer high-flow oxygen | While maintaining oxygen saturation is important, it is not the highest priority. Oxygen delivery is a product of cardiac output and arterial oxygen content. In cardiogenic shock, the primary defect is the cardiac output. Administering oxygen without addressing the pump failure will not correct the underlying tissue hypoxia. The ECPELLA study on prone positioning demonstrates that even in cases with severe hypoxemic respiratory failure, the management is layered on top of mechanical circulatory support, not as an isolated first step [4]. |

| 2. Insert a urinary catheter | Monitoring urine output is a vital indicator of renal perfusion and cardiac output, but it is an assessment and monitoring tool, not an immediate, life-preserving intervention. The priority is to first stabilize the patient’s hemodynamics and initiate the diagnostic pathway that will lead to reversing the shock state. |

| 3. Prepare for fluid resuscitation | This is a potentially dangerous intervention in cardiogenic shock from an MI. The cases describe a failing pump with "refractory shock" requiring mechanical support [1] and "severe cardiogenic shock" managed with an Impella device [3]. Fluids can precipitate acute pulmonary edema, especially in the setting of acute mitral regurgitation from papillary muscle rupture, where the left atrium is already volume-overloaded [2]. The correct initial approach is cautious preload augmentation via positioning while preparing for advanced diagnostics and MCS. |

The nurse’s immediate action must bridge the gap between recognizing the shock state and initiating the advanced, definitive therapies that the evidence now supports, such as emergent surgical repair [1], transcatheter edge-to-edge repair under ECMO support [2], or Impella-supported percutaneous coronary intervention [3]. Positioning the patient and preparing for invasive monitoring is the critical first step that enables all subsequent, life-saving interventions.References (research sources)

- [1]Successful Emergent Surgical Repair of Post-Myocardial Infarction Ventricular Septal Rupture With Cardiogenic Shock.Research articleBraga Lima MM, Maia da Silva W, Aguiar JF, Poppi NT, Vilela de Salis LV, Zoé de Medeiros Brito J, Veronese ET, Diniz Freire AF, Soares PR, Scudeler TL. (2026) · DOI: 10.1016/j.jaccas.2026.107927

- [2]Emergency mitral valve transcatheter edge-to-edge repair in cardiogenic shock due to papillary muscle rupture.Research articleAhmed U, Kim C, De Souza CM, Noor F, Laham R, Liu DC, Mahmood F. (2026) · DOI: 10.1016/j.jccase.2026.02.002

- [3]Left Main Spontaneous Coronary Artery Dissection Complicated by Cardiogenic Shock.Research articlePelletier M, Abraham K, Kallur A, Wessells D, Chen O. (2026) · DOI: 10.1016/j.jaccas.2026.107865

- [4]Prone Positioning During ECPELLA Support for Cardiogenic Shock: A Single-Center Retrospective Study.Research articleKajiura H, Sawamura A, Taniguchi T, Nishio K, Imaeda R, Tanahashi R, Yamauchi R, Tashiro H, Umemoto N, Ishiguro H, Shimizu K. (2026) · DOI: 10.3390/jcm15103626

## 임상 시나리오

Priorities in Cardiogenic ShockImmediate Nursing Actions Post-MI
The primary goal is to support cardiac output and facilitate definitive diagnosis. The modified Trendelenburg position can temporarily augment preload by promoting venous return, but use it cautiously as a bridge to advanced therapy.

Preparing for hemodynamic monitoring is critical to differentiate the shock etiology and guide precise interventions. Invasive arterial pressure monitoring and assessment for mechanical complications like papillary muscle rupture are essential.

Caution with FluidsAvoid aggressive fluid resuscitation in cardiogenic shock unless hypovolemia is confirmed. Volume loading can precipitate pulmonary edema and worsen ventricular wall stress, particularly in right ventricular infarction or acute mitral regurgitation.

## 핵심 개념

- **Cardiogenic Shock** — A state of tissue hypoperfusion due to the heart's inability to pump effectively, often from extensive MI or mechanical complications.
- **Modified Trendelenburg Position** — A supine position with legs elevated to passively increase venous return and preload in hypotensive patients.
- **Hemodynamic Monitoring** — Invasive assessment of cardiac function and vascular pressures to guide therapy in shock states.

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