A patient in the ICU has a pulmonary artery catheter in plac… | 마이메르시 MyMerci
Critical Care
문제

A patient in the ICU has a pulmonary artery catheter in place for hemodynamic monitoring. The nurse notes the following readings: CVP 18 mmHg, PAWP 22 mmHg, cardiac output 3.2 L/min, and blood pressure 88/52 mmHg. Which nursing intervention should be the priority?

해설
Elevated CVP (18 mmHg) and PAWP (22 mmHg) with low cardiac output (3.2 L/min) and hypotension indicate cardiogenic shock, requiring immediate physician notification for inotropic support. Other interventions (diuretics, dopamine, positioning) are not first-line for this presentation.

심화 해설

Core Nursing Explanation Key Concept Analysis: This question assesses the interpretation of hemodynamic monitoring data from a Pulmonary artery catheter (PAC or Swan-Ganz catheter) and the priority nursing action for a patient in Cardiogenic shock. The key is to synthesize the numbers: high filling pressures (CVP, PAWP), low cardiac output (CO), and low blood pressure (BP). This classic triad indicates the heart is failing as a pump, leading to inadequate tissue perfusion despite adequate or excessive preload.

Answer Rationale: Key Point! The priority is notifying the physician immediately. The data reveals a life-threatening condition: CVP 18 mmHg (normal: 2-6 mmHg), PAWP 22 mmHg (normal: 4-12 mmHg), CO 3.2 L/min (normal: 4-8 L/min), and hypotension. This profile is diagnostic for Cardiogenic shock. The nurse's critical role is to recognize this emergency, communicate it to the provider, and prepare for interventions like Inotropic support (e.g., dobutamine, milrinone) to improve the heart's contractility and CO.

Distractor Analysis:
Watch out for confusion! Option ① (Administer furosemide): Furosemide is a diuretic that reduces preload. While the PAWP is high, indicating pulmonary congestion, the primary problem is pump failure with shock. Diuretics would reduce blood volume and could worsen the already critical hypotension and low CO.
Option ② (Increase dopamine): Dopamine is an inotrope/vasopressor. While it might seem logical, increasing the rate without a new order based on this new data is unsafe. Furthermore, dopamine's effects are dose-dependent; at higher doses, it causes significant vasoconstriction, which could increase afterload and further strain the failing heart. The priority is assessment and communication before adjusting potent IV drips.
Option ④ (Trendelenburg position): This position (head down) is sometimes used for hypovolemic shock to increase venous return. For this patient, the problem is not lack of volume (CVP/PAWP are high) but the heart's inability to pump that volume. This position could worsen pulmonary congestion and respiratory status.

Related Concepts: This scenario integrates hemodynamics, shock management, and the nursing process. The nurse must prioritize based on the ABCs (Airway, Breathing, Circulation). The compromised circulation (low CO, hypotension) is the immediate threat. Understanding the different types of shock (cardiogenic, hypovolemic, distributive, obstructive) and their hemodynamic profiles is essential for correct intervention. Concept Summary
ParameterPatient ValueNormal RangeInterpretation
CVP (Central Venous Pressure)18 mmHg2-6 mmHgHigh right-sided filling pressure
PAWP (Pulmonary Artery Wedge Pressure)22 mmHg4-12 mmHgHigh left-sided filling pressure (pulmonary congestion)
Cardiac Output (CO)3.2 L/min4-8 L/minLow pump function
Blood Pressure (BP)88/52 mmHgVaries, but systolic 18 mmHg) indicates Left ventricular failure and pulmonary edema risk.
Inotropes vs. Diuretics: Inotropic agents (dobutamine, milrinone) increase myocardial contractility to raise CO. Diuretics (furosemide) reduce preload by promoting diuresis; they treat symptoms of congestion but do not fix the pump.
Cardiac Output (CO) Formula: CO = Heart Rate (HR) x Stroke Volume (SV). SV is determined by Preload, Afterload, and Contractility. In this case, contractility is the main issue. Memory Tips Mnemonic for Cardiogenic Shock Hemodynamics: "High Pressure, Low Output" (HPLO). The heart is full (high CVP/PAWP) but can't pump (low CO).
Think of the heart as a pump: If the inlet hose is full (high preload) and the outlet pressure is low (hypotension), the pump motor (myocardium) must be broken. High-Frequency NCLEX Topics Interpreting hemodynamic waveforms and values is a classic Core and High Yield topic for the NCLEX-RN, especially in critical care scenarios. The exam tests your ability to analyze data clusters, not just single numbers, and to prioritize actions based on that analysis. Recognizing shock states is fundamental. Watch Out for Question Variations! * Instead of asking for the priority intervention, the question might ask: "Which finding is most consistent with the patient's condition?" (Answer: Pulmonary edema). * It could shift to pharmacology: "The physician orders dobutamine. The nurse understands this drug is chosen primarily to:" (Answer: Increase myocardial contractility). * It might test safety: "When preparing to administer a prescribed inotropic agent, which patient parameter requires closest monitoring?" (Answer: Heart rate and rhythm, due to risk of tachycardia and arrhythmias).

임상 시나리오

Nursing Clinical Practice Guide Clinical Scenario: You are the nurse in a Cardiac ICU. Your patient, Mr. Johnson, is 72 hours post-Myocardial Infarction (MI). He has a PAC, arterial line, and is on a low-dose dopamine drip. During your assessment, you note he is increasingly lethargic, his skin is cool and clammy, and his urine output has dropped to 15 mL/hr over the last two hours. You check the hemodynamic monitor and obtain the values from the question.

Nursing Intervention Strategy: 1. Immediate Assessment (ABCs): Assess airway and breathing (listen for crackles, check SpO2). Check circulation (palpate pulses, assess capillary refill >3 seconds?). 2. Validate Data & Notify: Ensure transducer is leveled and zeroed. Immediately call the physician or rapid response team. Report using SBAR: Situation ("I'm calling about Mr. Johnson, he's showing signs of shock"), Background (post-MI), Assessment (state the vital signs and hemodynamic values verbatim), Recommendation ("I think he's in cardiogenic shock and needs inotropic support"). 3. Prepare for Orders: Have emergency equipment ready. Anticipate orders for: * Arterial blood gas (ABG) to assess for acidosis. * Electrolyte panel (especially potassium and magnesium before starting inotropes). * Preparation of inotropic drips (dobutamine, milrinone). * Possible transfer to a higher level of care. 4. Ongoing Monitoring: Continuous ECG, BP, and pulse oximetry. Strict intake and output (I&O). Frequent respiratory and neuro assessments.

Patient Safety and Precautions: * Do not leave the patient unattended. Delegate tasks like gathering equipment to other staff. * Contraindication: Avoid aggressive diuresis or nitrates in this hypotensive state, as they can precipitate cardiovascular collapse. * Medication Caution: Inotropes increase myocardial oxygen demand. Use an infusion pump, titrate slowly per protocol, and monitor for worsening ischemia (chest pain, ST-segment changes). Nursing Procedure & Medication Flow Managing a Patient on Inotropic Support: 1. Preparation: Use a dedicated IV line or central lumen. Label the line clearly "Vasoactive Medication." 2. Administration: Use an infusion pump. Double-check the dose and rate with another nurse. 3. Titration: Titrate based on specific parameters (e.g., MAP >65 mmHg, improved CO). Change only one parameter at a time and allow time for effect. 4. Monitoring: Monitor BP every 5-15 minutes during titration. Watch for side effects: tachycardia, arrhythmias, headache (with some vasopressors). 5. Weaning: Wean gradually to avoid rebound hypotension. A Word from Your Senior Nurse "Numbers on a monitor tell a story. Your patient's story here is, 'My heart is too weak to keep up.' Your most powerful tool in that moment is not your ability to titrate a drip—it's your clinical judgment to recognize the crisis and your communication skills to activate the team. In the ICU, you are the guardian of that data stream. Never ignore a cluster of abnormal values, especially when they paint a clear picture of deterioration. On the NCLEX and at the bedside, thinking like a nurse means connecting the dots between pathophysiology, assessment data, and timely action."

핵심 개념

  • Pulmonary Artery Catheter (Swan-Ganz Catheter) — A catheter inserted into the pulmonary artery to measure pressures in the right side of the heart and pulmonary circulation, including Cardiac Output (CO), Central Venous Pressure (CVP), and Pulmonary Artery Wedge Pressure (PAWP).
  • Cardiogenic Shock — A state of inadequate tissue perfusion due to primary cardiac dysfunction (pump failure), characterized by low cardiac output, hypotension, and evidence of end-organ hypoperfusion despite adequate intravascular volume.
  • Inotropic Support — Pharmacological therapy using medications (e.g., dobutamine, milrinone) that increase the force of myocardial contraction (positive inotropy) to improve cardiac output.
  • Pulmonary Artery Wedge Pressure — Pressure measured when the balloon of the PAC is inflated, occluding a branch of the pulmonary artery. It reflects the pressure in the left atrium and is an indirect measure of left ventricular end-diastolic pressure (preload).
  • Preload and AfterloadPreload: The volume of blood in the ventricles at the end of diastole (stretching of the heart muscle before contraction), reflected by CVP (right) and PAWP (left). Afterload: The resistance the ventricle must overcome to eject blood, primarily determined by systemic vascular resistance (SVR).

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