A nurse is caring for a patient in the intensive care unit who has a pulmonary artery catheter in place. The nurse obtains the following hemodynamic readings: pulmonary artery pressure (PAP) 45/25 mmHg, pulmonary capillary wedge pressure (PCWP) 22 mmHg, cardiac output (CO) 3.2 L/min, and systemic vascular resistance (SVR) 1800 dynes/sec/cm⁵. What is the priority nursing assessment for this patient?
1Assess for signs and symptoms of left-sided heart failure including dyspnea, crackles, and decreased oxygen saturation.✓ 정답
2Monitor for signs of right-sided heart failure such as jugular venous distention and peripheral edema.
3Evaluate for signs of hypovolemic shock including decreased urine output and altered mental status.
4Check for manifestations of septic shock such as fever, increased white blood cell count, and hypotension.
해설
Elevated PCWP (22 mmHg) indicates left-sided heart failure with pulmonary congestion, requiring priority assessment for dyspnea and crackles. Other options do not align with the hemodynamic pattern of left heart failure.
Core Nursing ExplanationKey Concept Analysis: This question tests the interpretation of Hemodynamic monitoring data from a Pulmonary artery catheter (PAC) and the clinical application of that data to guide priority nursing assessment. The core theme is linking elevated Pulmonary capillary wedge pressure (PCWP) to the pathophysiology of Left-sided heart failure (Left HF). PCWP is an indirect measure of Left ventricular end-diastolic pressure (LVEDP). When the left ventricle fails, pressure backs up into the left atrium and pulmonary veins, increasing PCWP and causing Pulmonary venous congestion.
Answer Rationale: The correct answer is ① Assess for signs and symptoms of left-sided heart failure including dyspnea, crackles, and decreased oxygen saturation. The patient's PCWP of 22 mmHg is significantly elevated (normal: 8-12 mmHg). This is the most critical finding, directly indicating elevated pressure in the left side of the heart and pulmonary circulation. Key Point! In clinical practice, an elevated PCWP is a hallmark of Pulmonary edema risk. The priority nursing action is to assess for the physical manifestations of this congestion: Dyspnea, Crackles (rales) on lung auscultation, and Hypoxemia (decreased SpO2). This assessment is urgent to prevent respiratory failure.
Distractor Analysis:
Watch out for confusion! Option ② (right-sided heart failure) is incorrect because while the Pulmonary artery pressure (PAP) is also elevated (45/25 mmHg; normal systolic: 15-25 mmHg), this is a consequence of the left-sided failure (post-capillary pulmonary hypertension). The primary problem indicated by the data is left-sided failure. Signs like JVD and edema would be secondary or indicate biventricular failure, but the PCWP points directly to the left side as the initial issue.
Option ③ (hypovolemic shock) is incorrect because the data suggests volume overload, not deficit. A low PCWP (< 6 mmHg) and low CO would suggest hypovolemia. Here, the CO is low-normal/borderline low, but the high PCWP and high SVR indicate the heart is failing against a high afterload, not from lack of volume.
Option ④ (septic shock) is incorrect because septic shock is characterized by Low systemic vascular resistance (SVR) and a high cardiac output (CO) in the early, hyperdynamic phase. This patient has a high SVR (1800; normal: 800-1200) and a low CO, which is the opposite pattern (cardiogenic shock).
Related Concepts: This hemodynamic profile (High PCWP, High SVR, Low CO) is classic for Cardiogenic shock secondary to left ventricular failure. The nurse's role extends beyond assessment to interventions like administering prescribed diuretics, nitrates, inotropes, and ensuring optimal oxygenation.
Nursing Clinical Practice GuideClinical Scenario: You are the ICU nurse for Mr. Johnson, a 68-year-old with a history of ischemic cardiomyopathy, admitted with acute shortness of breath. A pulmonary artery catheter was placed to guide therapy. You obtain the above readings.
Nursing Intervention Strategy:
1Immediate Assessment (ABCs)Listen to lung sounds bilaterally (expect crackles, possibly wheezes). Check oxygen saturation via pulse oximetry. Assess work of breathing (use of accessory muscles, tripod positioning). Auscultate heart sounds (S3 gallop may be present).
2PositioningPlace the patient in High Fowler's position to improve ventilation and reduce venous return to the heart.
3Oxygen TherapyApply supplemental oxygen as ordered and titrate to maintain SpO2 > 92%. Be prepared for non-rebreather mask or BiPAP/mechanical ventilation if respiratory distress worsens.
4Medication AdministrationAnticipate and administer IV diuretics (e.g., Furosemide) to reduce preload, nitrates (e.g., Nitroglycerin) to reduce preload and afterload, and possibly inotropes (e.g., Dobutamine) to improve contractility. Monitor urine output closely after diuretics.
Patient Safety and Precautions:
- Ensure the PAC transducer is correctly leveled and zeroed at the phlebostatic axis for accurate readings.
- Maintain the patency of the PAC lumen with a continuous heparinized saline flush under pressure to prevent clotting.
- Never inject fluid rapidly into the balloon port when obtaining a wedge pressure; inflate slowly until the waveform changes.
- Monitor the insertion site for signs of infection and ensure the dressing is intact and dated.
Nursing Procedure & Medication FlowProcedure: Obtaining a Pulmonary Capillary Wedge Pressure (PCWP)
1. Confirm the patient is supine with the head of bed flat or up to 30 degrees.
2. Ensure the pressure transducer is leveled at the phlebostatic axis (4th intercostal space, mid-axillary line).
3. Zero the transducer to atmospheric pressure.
4. Slowly inflate the balloon at the catheter tip with the specified amount of air (usually 1.5 mL) using a syringe. Stop immediately when the pulmonary artery waveform changes to a damped, atrial-looking waveform.
5. Hold inflation for only 2-3 respiratory cycles, record the pressure, then deflate the balloon completely. The balloon must never remain inflated.
6. Document the value and the patient's position.
A Word from Your Senior Nurse
"Numbers on a monitor are meaningless without connecting them to your patient. That PCWP of 22 isn't just a number—it's the feeling of fluid filling Mr. Johnson's lungs, making every breath a struggle. Your priority is to translate that number into action: listen, position, oxygenate, and diurese. In the ICU, you are the integrator of technology and human response. Mastering hemodynamics means you can anticipate problems before they become crises, making you an invaluable member of the critical care team."
Pulmonary Capillary Wedge Pressure — The pressure measured when the balloon of a pulmonary artery catheter is inflated, occluding a branch of the pulmonary artery. It reflects left atrial pressure and is an indirect measure of left ventricular end-diastolic pressure (LVEDP). Normal is 8-12 mmHg.
Systemic Vascular Resistance — The resistance against which the left ventricle must pump. Calculated from hemodynamic values. High SVR increases cardiac workload. Normal range is 800-1200 dynes/sec/cm⁵.
Cardiogenic Shock — A state of inadequate tissue perfusion due to primary cardiac dysfunction, characterized by low cardiac output and evidence of tissue hypoxia (e.g., altered mental status, cool clammy skin, oliguria), often with pulmonary congestion.
Pulmonary Edema — Life-threatening accumulation of fluid in the alveoli and interstitial spaces of the lungs, most commonly caused by left ventricular failure leading to increased pulmonary capillary pressure.
Preload and Afterload — Preload is the volume of blood in the ventricles at the end of diastole (estimated by PCWP for the left ventricle). Afterload is the resistance the ventricle must overcome to eject blood (estimated by SVR for the left ventricle).