The pressure in the Right Atrium is:

The pressure in the Right Atrium is:

• A. Pv
• B. Venous Pressure
• C. Right Atrial Pressure (Pra)
• D. Plasma

Answer: (C)

The pressure inside a specific heart chamber is its own chamber pressure. For the right atrium, that filling pressure is called right atrial pressure, abbreviated Pra. This is the exact pressure within the RA as it fills with venous blood from the body and before the right ventricle pumps it forward. Pra is typically a low pressure (roughly 0–8 mmHg in a healthy adult) and can vary with breathing and body position. Clinically, Pra is closely related to central venous pressure, which is used to assess fluid status and is measured near the RA. The term Pv refers more generally to venous pressure in the systemic veins, not the pressure inside the right atrium specifically, and plasma is not a pressure at all.

The pressure inside a specific heart chamber is its own chamber pressure. For the right atrium, that filling pressure is called right atrial pressure, abbreviated Pra. This is the exact pressure within the RA as it fills with venous blood from the body and before the right ventricle pumps it forward. Pra is typically a low pressure (roughly 0–8 mmHg in a healthy adult) and can vary with breathing and body position. Clinically, Pra is closely related to central venous pressure, which is used to assess fluid status and is measured near the RA. The term Pv refers more generally to venous pressure in the systemic veins, not the pressure inside the right atrium specifically, and plasma is not a pressure at all.