Question 1

Q: A pulmonary artery (Swan-Ganz) catheter measures all of the following except

Left ventricular end diastolic volume (LVEDV). ***Left ventricular end diastolic volume (LVEDV)*** - While a Swan-Ganz catheter can measure **pulmonary artery wedge pressure (PAWP)**, which is a surrogate for **left ventricular end-diastolic pressure (LVEDP)**, it cannot directly measure **left ventricular end-diastolic volume (LVEDV)**. - LVEDV requires imaging techniques like **echocardiography** or **cardiac MRI** for direct measurement. *Pulmonary artery wedge pressure (PAWP)* - The Swan-Ganz catheter can measure **PAWP**, which reflects **left atrial pressure** and, in the absence of mitral valve disease, - Is an estimate of **left ventricular end-diastolic pressure (LVEDP)**, therefore assessing left ventricular preload. *Mixed venous oxygen saturation (SvO2)* - The catheter has a fiberoptic sensor that can continuously measure **SvO2** from the pulmonary artery. - **SvO2** provides an assessment of the balance between oxygen supply and demand. *Cardiac output (CO)* - **Cardiac output** is commonly measured using the **thermodilution method** via the Swan-Ganz catheter. - A bolus of saline is injected into the right atrium, and temperature changes are detected in the pulmonary artery to calculate flow. [Practice more Anesthesiology PYQs on OnCourse]

Question

A pulmonary artery (Swan-Ganz) catheter measures all of the following except

Accepted Answer

Left ventricular end diastolic volume (LVEDV)

Answer

Pulmonary artery wedge pressure (PAWP)

Answer

Mixed venous oxygen saturation (SvO2)

Answer

Cardiac output (CO)

UPSC-CMS 2012 — Anesthesiology