Tricuspid annular geometry: a three-dimensional transesophageal echocardiographic study

Area of Science:

• Cardiovascular imaging
• Echocardiography
• Cardiac surgery

Background:

• Tricuspid annular area measurement is crucial for assessing tricuspid regurgitation (TR).
• Accurate geometric assessment of the tricuspid annulus is challenging with traditional methods.

Purpose of the Study:

• To evaluate the clinical feasibility of 3D transesophageal echocardiography (TEE) for measuring tricuspid annular area.
• To compare tricuspid annular geometry in patients with and without TR.
• To analyze the shape of the tricuspid annulus.

Main Methods:

• Prospective study at a tertiary care university hospital.
• Utilized 3D TEE in patients undergoing cardiac surgery.
• Analyzed volumetric data using specialized software (QLab, 4D Cardio-View, MATLAB) for area calculation and shape assessment.

Main Results:

• 3D TEE enabled feasible measurement of tricuspid annular area.
• Patients with significant TR exhibited eccentric annular dilation and larger annular areas.
• Planimetry measurements were more accurate than linear elliptical methods, which overestimated area.
• Confirmed the complex, saddle-shaped geometry of the tricuspid annulus.

Conclusions:

• 3D TEE is clinically feasible for accurate tricuspid annular area measurement.
• Eccentric annular dilation is a characteristic feature in patients with TR.
• The complex geometry of the tricuspid annulus necessitates advanced imaging and analysis techniques for accurate area quantification.