The Left Atrium is associated with which normal pressure range?

The Left Atrium is associated with which normal pressure range?

• A. 0-8 mmHg
• B. 90-140 mmHg
• C. 4-12 mmHg
• D. 20-30 mmHg

Answer: (C)

The left atrium operates at a relatively low filling pressure, serving as a reservoir for pulmonary venous return before the left ventricle fills. In a healthy heart, the mean left atrial pressure is about 4–12 mmHg. In practice, this is often inferred from the pulmonary capillary wedge pressure, which mirrors LA pressure, and the normal wedge/LA range is roughly 6–12 mmHg. So the range of 4–12 mmHg fits as the normal interval. Pressures well above this, like 20–30 mmHg, indicate elevated left-sided filling pressures (diastolic dysfunction, volume overload, or mitral valve disease), while values near or at zero are not consistent with normal physiology. The 0–8 mmHg range is too low to encompass typical normal values, which is why 4–12 mmHg is the best match.

The left atrium operates at a relatively low filling pressure, serving as a reservoir for pulmonary venous return before the left ventricle fills. In a healthy heart, the mean left atrial pressure is about 4–12 mmHg. In practice, this is often inferred from the pulmonary capillary wedge pressure, which mirrors LA pressure, and the normal wedge/LA range is roughly 6–12 mmHg. So the range of 4–12 mmHg fits as the normal interval.

Pressures well above this, like 20–30 mmHg, indicate elevated left-sided filling pressures (diastolic dysfunction, volume overload, or mitral valve disease), while values near or at zero are not consistent with normal physiology. The 0–8 mmHg range is too low to encompass typical normal values, which is why 4–12 mmHg is the best match.