A simple technique for bedside estimation of left atrial pressure

Area of Science:

• Cardiology
• Cardiovascular Physiology
• Diagnostic Imaging

Background:

• Accurate measurement of left atrial pressure (LAP) is crucial for differentiating cardiac from noncardiac causes of dyspnea.
• A reliable noninvasive method for assessing LAP is needed in clinical practice.
• Current methods for LAP estimation often require invasive procedures.

Purpose of the Study:

• To evaluate a novel noninvasive method for estimating LAP.
• To assess the correlation between LAP estimates derived from central systolic blood pressure (BP) and invasively measured wedge pressure.
• To compare the accuracy of central BP-derived LAP estimates with those derived from brachial BP.

Main Methods:

• Seventy-five stable patients undergoing right heart catheterization were included.
• Central systolic BP was measured using applanation tonometry (Sphygmocor® system).
• Peak left ventricle-left atrium (LV-LA) gradient was calculated from mitral regurgitation velocity using echocardiography.

Main Results:

• LAP estimates using central BP demonstrated a strong correlation with wedge pressure (r² = 0.774, P < .0001).
• LAP estimates using brachial systolic BP showed a weak correlation with wedge pressure (r² = 0.157, P = .0006).
• The central BP method maintained accuracy across varying degrees of mitral regurgitation and ejection fraction.

Conclusions:

• Central systolic BP combined with echocardiographic LV-LA gradient offers a promising noninvasive approach for LAP estimation.
• This noninvasive technique aligns with current echocardiographic guidelines for LAP assessment.
• Improving the precision of LV-LA gradient measurement could further enhance the accuracy of this method.