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European Journal of Echocardiography 2007 8(2):116-121; doi:10.1016/j.euje.2006.02.007
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Copyright © 2006, The European Society of Cardiology

Evaluation of mitral valve area by the proximal isovelocity surface area method in mitral stenosis: Could it be simplified?

David Messika-Zeitoun*, Agnes Cachier, Eric Brochet, Bertrand Cormier, Bernard Iung and Alec Vahanian

Cardiovascular Division, AP-HP, Bichat Hospital, 46 rue Henri Huchard, 75018 Paris, France

Received 5 October 2005; received in revised form 21 February 2006; accepted after revision 28 February 2006.

* Corresponding author. Tel.: +31 1 40 25 66 01; fax: +31 1 40 25 67 32. david.messika-zeitoun{at}bch.ap-hop-paris.fr


  Abstract

Aim One limitation for a wider use of the proximal isovelocity surface area method (PISA) for the evaluation of the mitral valve area (MVA) in patients with mitral stenosis (MS) is the requirement of an angle correction factor (angle {alpha} between the mitral leaflets) which cannot be obtained using the machine's built-in software and requires a manual measurement. The aim of the present study was to evaluate if the use of a fixed angle could provide an acceptable MVA estimation.

Methods and results In 48 patients (53±14years, 75% female and 32% atrial fibrillation), MVA was prospectively measured by planimetry (MVA2D) and PISA (PISAmes). The angle {alpha} was manually measured on paper prints using a protractor.

MVA2D was 1.38±0.56cm2 [0.5–2.40]. PISAmes ({alpha}=104±13° inter-quartiles 90–115) was 1.34±0.64cm2 [0.31–2.95] and did not differ from and correlated well with MVA2D (P=0.25; r=0.93, P<0.0001). MVA estimated using the PISA method and a fixed angle value from 90 to 110 (MVA{alpha}=90 to MVA{alpha}=110) progressively increased from 1.20±0.66 to 1.48±0.81cm2. Only MVA{alpha}=100 (1.34±0.74cm2) did not differ from and correlated well with both MVA2D and PISAmes (both P>0.35 and r>0.90, P<0.0001).

Conclusion The angle formed by the mitral leaflet only slightly changes in between patients and use of a fixed angle value of 100° provides an accurate estimation of the MVA by the PISA method in patients with MS. This simplification would facilitate and extend the use of the PISA as an additional method for the assessment of MS severity in routine practice.

Keywords: Mitral stenosis; Echocardiography; Proximal isovelocity surface area method (PISA)


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