Which catheter measures pressure in the vena cava or right atrium?

• A. CVP line
• B. Thermodilution catheter
• C. Balloon catheter
• D. Bronchoscopy

Answer: (A)

The main idea here is understanding where a catheter is placed to measure central venous pressure, which reflects the pressure in the vena cava and right atrium and helps gauge right-sided preload.

A central venous pressure line is inserted into a central vein (such as the internal jugular or subclavian) with the catheter tip positioned near the junction of the vena cava and right atrium. This placement allows direct reading of the pressure in those central veins and the right atrium, providing a measure of venous return and right heart preload.

A thermodilution catheter, while also inserted via a central vein, is used to measure pulmonary artery pressures and cardiac output, not the central venous pressure. A balloon catheter typically refers to a catheter with a balloon used for occluding a vessel or for specific measurements in other contexts, not primarily for CVP. Bronchoscopy is an airway procedure and does not measure heart or venous pressures.

So, the catheter designed to measure pressure in the vena cava or right atrium is the central venous pressure line.