Swan-Ganz Catheter Measurements Analysis

A pulmonary artery catheter, commonly known as a Swan-Ganz catheter, is a tool used in critical care to provide continuous monitoring of hemodynamic status. It measures several parameters directly or indirectly.

Key Parameters Measured by Swan-Ganz Catheter

• Cardiac Output (CO): Can be measured using methods like thermodilution.
• Pulmonary Artery Wedge Pressure (PAWP): Reflects left atrial pressure and estimates left ventricular end-diastolic pressure (LVEDP).
• Mixed Venous Oxygen Saturation ($Sv_{O_2}$): Indicates the balance between oxygen delivery and consumption in the body.

Parameter NOT Directly Measured

The Swan-Ganz catheter does not directly measure Left Ventricular End Diastolic Volume (LVEDV). While PAWP provides an indirect estimate related to left ventricular filling pressures (LVEDP), the actual volume of blood in the left ventricle at the end of diastole (LVEDV) requires other imaging modalities like echocardiography or MRI for direct measurement.

Conclusion

Therefore, the Swan-Ganz catheter measures cardiac output, pulmonary artery wedge pressure, and mixed venous oxygen saturation, but it does not directly measure Left Ventricular End Diastolic Volume (LVEDV).

The correct option is 4.