Detection of prosthetic mitral valve leak: a comparative study using transesophageal echocardiography, transthoracic...

Paravalvular leakage is a major complication of prosthetic valve dysfunction. Sixty-one subjects with valvular heart disease who had received prosthetic mitral valve replacement 5 months to 5 years before (43 received a porcine prosthesis and 18 received Bjork-Shiley valve prostheses) were evaluated for this complication. Careful auscultation was performed by two experienced cardiologists followed by transthoracic and transesophageal echocardiography. Physiologic leaks were detected in all Bjork-Shiley valves, but in only 30% of porcine valves using transesophageal echocardiography. These regurgitant jets were flame-like, with mean low velocities of 50 +/- 12.3 cm/sec and 48 +/- 18.2 cm/sec in the two types of valves. Neither transthoracic echocardiography nor auscultation could detect physiological regurgitant jets. Ten cases with paravalvular leak were detected by transesophageal echocardiography and subsequently demonstrated by left ventriculography (7 porcine, 3 Bjork-Shiley valves). Pathologic regurgitant jets were seen as high-velocity, systolic-retrograde turbulent flow across the prosthesis. However, only 6 cases of prosthetic valve dysfunction were detected by transthoracic echocardiography, 4 cases of mild paravalvular leakage went undetected. Thirteen of the 61 subjects had an apical systolic murmur and suspected prosthetic valve leakage; in 10 of the 13 cases the findings corresponded to those obtained by transesophageal echocardiography. In 3 cases of double valve replacement with Bjork-Shiley valves the magnitude of the leakage was overestimated by auscultation.