A nurse is monitoring the pulmonary artery wedge pressure (PAWP) for a client. The nurse should identify that a reading of 17 mm Hg is an indication of which of the following conditions?
A.
Right ventricular failure
B.
Fluid volume deficit
C.
Mitral regurgitation
D.
Afterload reduction
The correct answer and Explanation is :
The correct answer is C. Mitral regurgitation.
Explanation:
Pulmonary artery wedge pressure (PAWP), also known as pulmonary capillary wedge pressure (PCWP), is an important hemodynamic parameter used to assess left atrial pressure and indirectly reflect left ventricular (LV) function. Normal PAWP values typically range from 6 to 12 mm Hg. A PAWP reading of 17 mm Hg indicates elevated left atrial pressure, which can occur in several conditions, but it is particularly associated with mitral regurgitation.
Mitral Regurgitation:
In mitral regurgitation, the mitral valve fails to close completely during systole, allowing blood to flow back from the left ventricle into the left atrium. This backflow increases the volume and pressure in the left atrium, which subsequently raises the pressure in the pulmonary circulation, as reflected in the PAWP. As the left atrial pressure rises, the pulmonary venous pressure also increases, leading to pulmonary congestion and symptoms of heart failure.
Other Options:
- A. Right Ventricular Failure: While right ventricular failure can influence pulmonary pressures, it primarily affects the right heart and typically results in elevated central venous pressure rather than a direct increase in PAWP.
- B. Fluid Volume Deficit: A fluid volume deficit would generally lead to decreased PAWP due to reduced blood volume returning to the heart.
- D. Afterload Reduction: This is more related to systemic vascular resistance and affects blood flow dynamics, but does not directly cause an elevated PAWP.
In conclusion, a PAWP of 17 mm Hg is indicative of increased left atrial pressure, commonly seen in conditions like mitral regurgitation, making it the best answer in this scenario. Monitoring PAWP can guide treatment decisions and assess the effectiveness of interventions in managing heart failure and related conditions.