Evaluation of echocardiography and computed tomography characteristics related to aortic valve replacement technique through the right anterior thoracotomy at the 2nd intercostal space

Abstract

Objective: evaluate echocardiographic and computed tomography characteristics related to minimally invasive aortic valve replacement technique through the right anterior thoracotomy at the 2nd intercostal space. Methods: study on 74 patients undergoing aortic valve replacement surgery through the right anterior thoracotomy at the 2nd intercostal space at Hanoi Heart Hospital and 108 Military Central Hospital, from October 2019 to December 2022. Patients underwent preoperative echocardiography and multiple slices computed tomography to assess the lessons of aortic valve, valve annulus diameter, and intercostal space width. Results: The ratio of aortic valve stenosis is 55.4%, stenosis combined with regurgitation is 31.1%, and aortic regurgitation is 13.5%. The average valve annulus diameter on computed tomography scans is 26.5 ± 3.1 mm (smallest 20; largest 36); average 2nd intercostal space width 18.1 ± 3.1 mm (smallest 11; largest 25). Valve annulus diameter measured by computed tomography correlates closely with actual prosthetic valve size (r = 0.54, p < 0.001); measured by echocardiography had a weak correlation and not statistically significant. The prosthetic valve size to be replaced is smaller than the valve annulus diameter measured on computed tomography, with an average of 4.8 ± 2.7 mm in aortic valve stenosis, 5.7 ± 2.0 mm in combined stenosis and regurgitation, and 7.2 ± 2.9 mm in aortic regurgitation, in which the difference between valve stenosis and regurgitation is statistically significant (p = 0.01). Conclusions: Minimally invasive aortic valve replacement technique through the 2nd intercostal space right thoracotomy, with cutting the 3rd rib, is suitable for Vietnamese anatomy. Valve annulus diameter measured by computed tomography has a good linear correlation and can be a predictor for prosthetic valve size before surgery.