A client with acute respiratory distress syndrome (ARDS) shows no improvement despite increases in concentration in oxygen administered. What intervention should the nurse attempt which may improve ventilation-perfusion matching?

A. A heart murmur typically indicates turbulent blood flow through a heart valve. This turbulence can occur due to various reasons, such as valve stenosis (narrowing), regurgitation (leakage), or structural abnormalities of the valves. The turbulent flow produces audible sounds that can be heard with a stethoscope during cardiac auscultation.

B. A heart murmur is not caused by blood entering an inflexible chamber. Instead, it is caused by turbulent blood flow through the heart valves. The sound produced by this turbulent flow may vary depending on the underlying pathology of the valve.

C. While heart murmurs can be described based on their characteristics (such as high-pitched or low- pitched), the presence of a heart murmur does not necessarily indicate a narrow valve. Murmurs can occur due to various valve abnormalities, including stenosis (narrowing) or regurgitation (leakage). The pitch and quality of the murmur may vary depending on the underlying pathology and the location of the abnormality.

D. A heart murmur is not typically associated with inflammation around the heart. While inflammation of the heart (such as myocarditis or pericarditis) can cause symptoms and abnormal sounds, these conditions would not be described specifically as a "heart murmur."

D. Monitoring central venous pressure (CVP) is an appropriate nursing intervention for a patient with a pulmonary artery catheter. While the pulmonary artery catheter primarily provides information about pulmonary artery pressures and cardiac output, it can also be used to measure central venous pressure. Monitoring CVP can help assess the patient's fluid status, right ventricular function, and response to fluid resuscitation. This intervention is directly relevant to the presence of the pulmonary artery catheter and helps guide patient management.

A. Assist with ambulation: It's not typically appropriate to assist a patient with ambulation while they have a pulmonary artery catheter in place. This catheter is inserted into the pulmonary artery and is used to monitor various hemodynamic parameters such as pulmonary artery pressure, cardiac output, and mixed venous oxygen saturation. Ambulation could disrupt the catheter placement or lead to complications such as bleeding or dislodgement.

B. Administering a diuretic medication may not be directly related to the presence of a pulmonary artery catheter. The use of diuretics is typically based on the patient's clinical condition and the healthcare provider's assessment of their fluid status and renal function. While information obtained from the pulmonary artery catheter, such as pulmonary artery pressure and cardiac output, may inform the decision-making process regarding diuretic therapy, the catheter itself does not dictate the administration of diuretics.

C. Administering a vasopressor medication may be appropriate for a patient with a pulmonary artery catheter if they are experiencing hypotension or shock. However, the decision to administer vasopressors should be based on the patient's hemodynamic parameters as assessed through the pulmonary artery catheter monitoring, along with clinical judgment and consideration of the underlying cause of the hypotension.