Right atrial pressure

Right atrial pressure (RAP) is the blood pressure in the right atrium of the heart. It is an important factor in the function of the heart and the overall circulatory system.

Overview

The right atrial pressure is a key component in the assessment of cardiac function and fluid status in the body. It is typically measured in millimeters of mercury (mmHg) and can be influenced by several factors including the volume of blood in the body, the function of the right atrium and ventricle, and the pressure in the pulmonary artery.

Measurement

Right atrial pressure can be measured directly by inserting a catheter into the right atrium. This is typically done in a hospital setting and is known as a right heart catheterization. It can also be estimated non-invasively using echocardiography, which uses sound waves to create images of the heart and its function.

Clinical significance

Abnormal right atrial pressure can be a sign of several medical conditions. High right atrial pressure, or right atrial hypertension, can be caused by conditions such as congestive heart failure, pulmonary hypertension, and tricuspid valve disease. Low right atrial pressure, or right atrial hypotension, can be caused by conditions such as dehydration, blood loss, and certain types of shock.

See also

• Central venous pressure
• Heart
• Blood pressure