A new method for assessing right-sided heart pressures using encapsulated microbubbles--a preliminary report.

Area of Science:

• Cardiovascular physiology
• Biomedical engineering
• Medical diagnostics

Background:

• Accurate measurement of right heart pressures is crucial for diagnosing and managing various cardiovascular conditions.
• Current methods often involve invasive catheterization, posing risks and discomfort to patients.

Purpose of the Study:

• To introduce and evaluate a novel, non-catheter method for measuring pressures on the right side of the heart.
• To explore the feasibility of using microbubble oscillations for pressure sensing in cardiac chambers.

Main Methods:

• Injection of specially manufactured carbon dioxide microbubbles into the peripheral venous system.
• Recording microbubble oscillations using a chest wall microphone.
• Analyzing oscillation frequency as a function of surrounding cardiac pressure.

Main Results:

• The method successfully recorded microbubble oscillations in canine models.
• The frequency of oscillations correlated with surrounding pressure.
• The technique demonstrated better potential for measuring higher systolic pressures compared to lower diastolic pressures.

Conclusions:

• A non-catheter method for right heart pressure measurement using CO2 microbubbles is feasible.
• Further development is required for clinical validation and optimization, particularly for diastolic pressure assessment.