CAMRT Radiography Practice Exam

What anatomical feature is primarily assessed through a Swan-Ganz catheter?

1. Systemic circulation

2. Pulmonary hemodynamics

3. Ventilation status

4. Peripheral circulation

The correct answer is: Pulmonary hemodynamics

The primary purpose of a Swan-Ganz catheter is to measure pulmonary hemodynamics, which involves evaluating the pressures and blood flow within the pulmonary circulation. This catheter is inserted into a central vein, typically the internal jugular or subclavian vein, and then advanced into the right atrium, right ventricle, and finally into the pulmonary artery. Through this placement, the catheter can provide critical measurements such as the pulmonary arterial pressure, pulmonary capillary wedge pressure, and cardiac output. These measurements are essential for assessing various conditions related to heart and lung function, particularly in patients with acute respiratory distress, heart failure, or pulmonary hypertension. The other options do not reflect the primary function of the Swan-Ganz catheter. While systemic circulation (the flow of blood from the heart to the rest of the body) and peripheral circulation (flow to the limbs and tissues) are important aspects of cardiovascular health, they are not directly measured with this specific catheter. Ventilation status involves assessing air exchange in the lungs and is typically evaluated through different means, such as pulse oximetry or arterial blood gas levels, rather than through hemodynamic measurements provided by a Swan-Ganz catheter.