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Abstract
Background: Rheumatic mitral stenosis severity has been assessed by the systolic time interval between the QRS onset and the first heart sound (QS1) by phonocardiography. We hypothesized that non-invasive computerized acoustic cardiography could evaluate mitral stenosis severity compared with echocardiography and invasive haemodynamics in patients undergoing percutaneous transvenous mitral commissurotomy (PTMC).
Methods: 27 patients underwent computerized acoustic cardiography, echocardiography, and invasive haemodynamic measurements prior to and after PTMC.
Results: The mean age was 31 ± 10 years, and 21 (78%) were female. By echocardiography, mitral valve area increased from 0.82 ± 0.14 to 1.50 ± 0.24 cm2 (p < 0.0001). The QS1 interval decreased from 101.7 ± 12.9 to 93.2 ± 9.2 ms (p < 0.0001). The change in the QS1 interval correlated with the change in mitral valve area by echocardiography (p = 0.037), right ventricular systolic pressure (p < 0.0001), and the invasive mitral valve gradient (p = 0.076).
Conclusions: Acoustic cardiography may be used as an adjunctive non-invasive diagnostic tool to assess mitral stenosis severity.
Declaration of interest: Dr Arand is an employee of Inovise Medical. Dr Michaels has received an unrestricted educational grant from Inovise Medical.