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The Challenge of Assessing Heart Valve Prostheses by Doppler Echocardiography

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The Challenge of Assessing Heart Valve Prostheses by Doppler Echocardiography Editorial Comment The Challenge of Assessing Heart Valve Prostheses by Doppler Echocardiography Helmut Baumgartner, MD, Muenster, Germany The assessment of prosthetic valve function remains challenging. by continuous-wave Doppler measurement. Using these velocities Echocardiography has become the key diagnostic tool not only be- for the calculation of transvalvular gradients results in marked overes- cause of its noninvasive nature and wide availability but also because timation of the actual pressure drop across the prostheses.6 The fact of limitations inherent in alternative diagnostic techniques. Invasive that this phenomenon more or less disappears in malfunctioning bi- evaluation is limited particularly in mechanical valves that cannot leaflet prostheses when the funnel-shaped central flow channel ceases be crossed with a catheter, and in patients with both aortic and mitral to exist because of restricted leaflet motion makes the interpretation valve replacements, full hemodynamic assessment would even of Doppler data and their use for accurate detection of prosthesis mal- require left ventricular puncture. Although fluoroscopy and more function even more complicated.7 Furthermore, the lack of a flat ve- recently computed tomography allow the visualization of mechanical locity profile and the central high velocities described above cause valves and the motion of their occluders, the evaluation of prosthetic erroneous calculations of valve areas when the continuity equation valves typically relies on Doppler echocardiography. incorporates such measurements.8 For these reasons, the analysis of Although Doppler echocardiography has become an ideal nonin- occluder motion using fluoroscopy (in mitral prostheses, this may vasive technique for the evaluation of native heart valves and their also be obtained on transesophageal echocardiography) remains es- function, the assessment of prosthetic valves has remained more dif- sential to avoid the misinterpretation of high Doppler velocities across ficult. Although the evaluation of secondary effects on heart cham- bileaflet prosthetic valves. bers, ventricular function, and pulmonary circulation can in general The second specific problem that complicates the interpretation of be provided accurately, the evaluation of prostheses themselves has Doppler data in prosthetic heart valves is that most normally function- major limitations. The assessment of valve morphology as well as val- ing prostheses slightly obstruct the flow compared with normal native vular and perivalvular regurgitation is complicated by artifacts and valves. This means that velocities, corresponding gradients, and pres- shadowing caused by the prosthetic material.1 This is particularly sure half-time measures are generally higher than in normal native the case when transthoracic echocardiography is used, but it also re- valves. This frequently makes it difficult to differentiate between nor- mains a major limitation for transesophageal echocardiography.2,3 Al- mal and abnormal prosthetic valve function; in other words, to decide though the latter may provide important information on bioprosthetic when elevated velocities, gradients, or pressure half-times indicate pros- valve function by visualizing leaflet morphology and motion, and on thetic valve malfunction. The meaningful interpretation of Doppler mechanical valve function in mitral prostheses in which it frequently data requires first of all the knowledge of the type and size of the valve allows the diagnostic evaluation of occluder motion, prosthetic valve that is interrogated. A stented bioprosthesis causes more flow obstruc- function is primarily assessed using Doppler echocardiography tion than a stentless valve, and a smaller sized valve causes more ob- (mainly using transthoracic echocardiography). As for native valves, struction than a larger valve. Normally functioning bileaflet valves Doppler echocardiography can be used to measure transvalvular ve- present with higher Doppler velocities than tilting disc valves, and so locities and gradients and to calculate effective orifice areas in patients on.9,10 In addition, transvalvular velocities and gradients are highly with valve prostheses. However, major differences and some limita- flow dependent.10 Thus, even when looking at a specific size of a certain tions must be considered when interpreting Doppler measures of valve type, the measurements reported for normally functioning valves transprosthetic flow velocities and orifice areas. vary markedly,9,10 and additional consideration of the individual flow First, transvalvular velocities cannot be used to accurately calculate rate may be required to decide whether a certain value of velocity or the pressure drop across certain valve types, because of the rather gradient must be considered abnormal or if it is still consistent with nor- complex flow velocity profiles in mechanical valves.4,5 This is partic- mal prosthetic valve function. In any case, the availability of normal ularly the case in bileaflet prostheses, in which flow contraction causes values for Doppler measurements, gathered in large groups of patients a low-pressure field followed by significant pressure recovery within with apparently normally functioning valves, and specifying valve type the central orifice and flow channel between the two leaflets.6 This and valve size, are essential for assessing heart valve prostheses in daily phenomenon results in high central velocities, which are detected practice. Such data have been provided in the past11,12 but have always been more or less incomplete, considering the great and constantly in- creasing number of different valve products and the relatively small From the Adult Congenital and Valvular Heart Disease Center, University Hospital Muenster, University of Muenster, Muenster, Germany. number of patients in most published reports. In this issue of the Journal of the American Society of Echocardiography, Editorial Comments published in the Journal of the American Society of Echocar- 13 diography (JASE) reflect the opinions of their author(s), and do not necessarily Blauwet et al add important new information in this respect by pro- represent the views of JASE, its editors, or the American Society of Echocardiog- viding comprehensive echocardiographic data from a large group of raphy. patients with Carpentier-Edwards Duraflex mitral bioprostheses (Ed- Reprint requests: Helmut Baumgartner, MD, Adult Congenital and Valvular Heart wards Lifesciences, Irvine, CA), a type of prosthesis for which few Disease Center, University Hospital Muenster, University of Muenster, Albert- data have been published on normal Doppler values. In a retrospec- Schweitzer-Strasse 33, 48149 Muenster, Germany (E-mail: helmut.baumgartner@ tive analysis, the authors report comprehensive echocardiographic ukmuenster.de). data from 240 patients studied early after valve replacement. All 0894-7317/$36.00 patients had either ratios of the time-velocity integral (TVI) for the Copyright 2009 by the American Society of Echocardiography. mitral valve prosthesis to the TVI for the left ventricular outflow tract doi:10.1016/j.echo.2009.02.012 < 3.9 or E velocities < 2.8 m/s. Pressure half-times were <130 ms 394 Journal of the American Society of Echocardiography Baumgartner 395 Volume 22 Number 4 in all patients, and 97% had TVI ratios < 3.9 and E velocities < 2.8 m/ some degree, serial follow-up measurements with well-defined base- s, regardless of bioprosthesis size, left ventricular function, heart rate, line measurements for later comparison, together with careful consid- hemoglobin, or hematocrit. Blauwet et al conclude that these cutoff eration of valve type, valve size, flow situation, and the presence of values may therefore be useful in identifying on Doppler echocardi- additional valvular regurgitation, are required for appropriate individ- ography prosthetic valve dysfunction in patients with this type of mi- ual prosthetic valve function assessment. Additional fluoroscopy or tral bioprosthesis. computed tomography for the analysis of occluder motion may be Although it is true that patients with measurements beyond these required in mechanical valves. reported cutoff values are very likely to have prosthetic valve dysfunc- tion, caution is required when applying these results and conclusions in clinical practice. The major limitation of Blauwet et al’s13 study was that only normal valves were included. Thus, the authors can only re- REFERENCES port the range of measurements found in a group of patients assumed to have normal prosthetic valve function. Clinically valid cutoff values 1. Sprecher DL, Adamick R, Adams D, Kisslo J. In vitro color flow, pulsed and for the distinction between normal and malfunctioning valves, how- continuous wave Doppler ultrasound masking of flow by prosthetic valves. ever, cannot be identified in such a patient group. It remains uncertain J Am Coll Cardiol 1987;9:1306-10. from these data how frequently valve malfunction can be encoun- 2. Khandheria BK, Seward JB, Oh JK, Freeman WK, Nichols BA, Sinak LJ, et al. Value and limitations of transesophageal echocardiography in assess- tered in patients with values below the reported cutoffs. In other ment of mitral valve prostheses. Circulation 1991;83:1956-68. words, these cutoffs may have reasonable specificity for diagnosing 3. Daniel WG, Mugge A, Grote J, Hausmann D, Nikutta P, Laas J, et al. Com- prosthesis malfunction but insufficient sensitivity. In fact, on the basis parison of transthoracic and transesophageal echocardiography
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