A nurse is caring for a patient with acute decompensated heart failure who has a pulmonary artery catheter in place. Which assessment finding would be the MOST concerning and require immediate intervention?

Elevated PAWP with decreased cardiac output indicates severe left heart failure and high risk of pulmonary edema, requiring immediate intervention. Other parameters are less urgent in this context.

Core Nursing Explanation Key Concept Analysis: This question tests the critical interpretation of hemodynamic monitoring data in a patient with Acute Decompensated Heart Failure (ADHF). The key is understanding which parameter most directly indicates an immediate, life-threatening complication—specifically, the risk of pulmonary edema due to left ventricular failure. The Pulmonary Artery Wedge Pressure (PAWP), also known as Pulmonary Capillary Wedge Pressure (PCWP), is the gold standard for assessing left ventricular filling pressure and pulmonary venous pressure.

Answer Rationale: Key Point! In the context of ADHF, an elevated PAWP is the most concerning finding. It directly reflects pressure in the left atrium and left ventricle at the end of diastole. A significantly elevated PAWP (>18 mmHg, with critical levels often >25-30 mmHg) indicates severe pulmonary venous congestion, which can rapidly progress to life-threatening pulmonary edema and respiratory failure. This requires immediate intervention such as diuretics, vasodilators, or inotropic support to reduce preload and afterload.

Distractor Analysis:
Watch out for confusion! While an elevated Central Venous Pressure (CVP) (option 2) indicates right-sided heart failure or fluid overload, it is a measure of right atrial pressure and is less immediately life-threatening than left-sided failure leading to pulmonary edema. It is important, but not the most concerning in this acute left-heart failure scenario.
An elevated Systemic Vascular Resistance (SVR) (option 3) indicates increased afterload, which worsens heart failure. However, it is a calculated parameter and its urgency is typically secondary to addressing the direct pressure overload in the lungs (PAWP).
A Mixed Venous Oxygen Saturation (SvO₂) of 55% with tachycardia (option 4) is abnormal (normal is 60-80%) and indicates decreased oxygen delivery or increased consumption. While concerning and a sign of poor cardiac output, a low SvO₂ is often a consequence of the pump failure. The immediate threat to airway and breathing (from pulmonary edema signaled by high PAWP) takes priority over the threat to circulation signaled by low SvO₂, following the ABC (Airway, Breathing, Circulation) priority framework.

Related Concepts: This integrates knowledge of hemodynamics, pathophysiology of heart failure, and nursing prioritization. Remember: In left-sided heart failure, think "LUNGS." The pressure backs up into the pulmonary circulation, and PAWP is your direct window into that pressure. Concept Summary

Parameter	Normal Range	What It Measures	Clinical Significance in HF
PAWP (PCWP)	4-12 mmHg	Left ventricular end-diastolic pressure (LVEDP)	Key Point! Primary indicator of pulmonary congestion and risk for pulmonary edema.
CVP	2-6 mmHg	Right atrial pressure	Indicator of right ventricular preload and fluid status.
SVR	800-1200 dynes/sec/cm⁻⁵	Resistance against which the left ventricle pumps	High SVR increases cardiac workload (afterload).
SvO₂	60-80%	Oxygen saturation in pulmonary artery (mixed venous blood)	Global indicator of tissue oxygen extraction; low value suggests inadequate cardiac output.

Side-by-Side Comparison!

Finding	Indicates	Urgency in ADHF	Typical Immediate Nursing Action
High PAWP (>18 mmHg)	Imminent pulmonary edema	HIGHEST (Threat to Airway/Breathing)	Elevate HOB, administer ordered IV diuretics (e.g., furosemide), prepare for possible intubation.
Low SvO₂ ( 임상 시나리오 Nursing Clinical Practice Guide Clinical Scenario: You are the nurse on a cardiac step-down unit. Mr. Johnson, 68, with a history of ischemic cardiomyopathy, was admitted yesterday with ADHF. He has a pulmonary artery catheter in place. During your morning assessment, he becomes increasingly restless and short of breath. You check his hemodynamic monitor. Nursing Intervention Strategy: Immediate Assessment (Look at the numbers!): You see: PAWP 26 mmHg, CVP 10 mmHg, SvO₂ 58%, heart rate 112 bpm. Your brain should immediately flag the PAWP as critical. First Actions (Within seconds): Call for help (alert the charge nurse/respiratory therapist). Position: Sit the patient upright in High Fowler's position to improve lung expansion. Oxygen: Apply non-rebreather mask at 15 L/min to maximize oxygenation. Reassure the patient: "Mr. Johnson, I'm here. I'm going to help you breathe easier." Notify and Implement Orders: Immediately notify the physician/NP with SBAR: "S: Mr. Johnson is acutely dyspneic. B: History of ADHF. A: PAWP is 26, SpO₂ is 88% on room air, crackles bilaterally. R: Requesting stat orders for IV Lasix and possibly nitroglycerin." Administer IV furosemide as ordered. Monitor urine output closely (expect diuresis). If ordered, titrate a nitroglycerin drip to reduce preload/afterload, monitoring BP closely for hypotension. Ongoing Monitoring & Evaluation: Continuous pulse oximetry and cardiac monitoring. Auscultate lung sounds frequently for improvement/worsening of crackles. Reassess hemodynamics (goal: decreasing PAWP). Monitor for electrolyte imbalances (especially hypokalemia) from diuresis. Patient Safety and Precautions: PA Catheter Specifics: Ensure the transducer is leveled at the phlebostatic axis (4th intercostal space, mid-axillary line) for accurate readings. Never flush aggressively if the waveform is dampened—this could indicate a wedged catheter; notify the provider. Medication Caution: Diuretics and vasodilators can cause rapid hypotension. Obtain a baseline BP and monitor frequently during and after administration. Infection Control: Maintain sterile technique with all catheter ports and dressing changes to prevent catheter-related bloodstream infection (CRBSI). Nursing Procedure & Medication Flow Administering IV Furosemide for High PAWP: Verify: Order, patient, drug, dose, route, time. Check for sulfa allergy (cross-sensitivity possible). Prepare: Draw up medication. Often given IV push slowly (over 1-2 minutes) for rapid effect. Administer: Inject into a patent IV line. Have a urinal or bedpan ready. Monitor: Output: Measure urine output hourly. Expected: >30 mL/hr after diuretic. Lungs: Listen for decrease in crackles. Labs: Monitor potassium, sodium, and creatinine levels. Vitals: Watch for orthostatic hypotension. A Word from Your Senior Nurse "In the fast-paced world of cardiac nursing, numbers tell a story. That PAWP isn't just a number on a screen; it's the pressure flooding your patient's lungs. Your ability to recognize which number is the villain in that moment—and to act swiftly on that knowledge—is what separates a task-completer from a life-saving nurse. On the NCLEX, they're testing if you can think like that nurse. Don't just memorize normal values; internalize the story behind the abnormal ones. Ask yourself: 'If I saw this, what would I be afraid is happening to my patient right now?' That clinical reasoning is your most powerful tool, for the exam and for the bedside." 핵심 개념 Pulmonary Artery Wedge Pressure — Also called PCWP. It is an estimate of left atrial pressure and left ventricular end-diastolic pressure (LVEDP). It is the key hemodynamic parameter for assessing pulmonary venous pressure and risk of pulmonary edema. Acute Decompensated Heart Failure — A sudden or worsening of symptoms and signs of heart failure, often requiring urgent therapy. It is characterized by pulmonary and/or systemic congestion due to impaired cardiac output. Mixed Venous Oxygen Saturation (SvO₂) — The oxygen saturation of blood in the pulmonary artery, representing the balance between oxygen delivery and consumption by the tissues. A low value suggests inadequate cardiac output. Pulmonary Edema — A life-threatening condition where fluid accumulates in the alveoli and interstitial spaces of the lungs, most commonly due to left ventricular failure causing elevated pulmonary venous pressure (high PAWP). Preload and Afterload — Preload is the volume of blood in the ventricles at the end of diastole (related to PAWP/CVP). Afterload is the resistance the ventricle must overcome to eject blood (related to SVR). Heart failure management often targets reducing both. 마이메르시로 국가고시 완벽 대비 기출문제와 상세 해설을 무료로. 내 약점을 분석하고 진도를 관리하며 더 똑똑하게 공부하세요. 무료로 시작하기 App Store Google Play 학습 참고용입니다. 실제 임상은 최신 지침과 소속 기관 프로토콜을 따르세요.