Introduction: Mitral valve (MV) apparatus is a vital structural component of the heart. The defective structure and function of any one or more components of mitral valve apparatus can lead to mitral valve dysfunction. Present study is an attempt to establish the normal reference value of mitral valve apparatus that would help in differentiating normal from diseased valve in borderline situation in clinical practice. Methods: All eligible subjects underwent detailed echo study of MV on Philips IE33 echo machine using phased array broad band 2-4 MHZ and 4-6 MHZ. The data of MV structure was analyzed in relation to predefined age groups & gender wise. Result: Mean and range of Mitral annular diameter in minor axis plane in diastole and systole was 2.3(1.4-3.0) v/s 2.2(1.5-2.9)cms recorded in Parasternal long axis (PSLAX) view, 2.3(1.6-3.5) v/s 2.2(1.6- 2.9)cms in Apical four chamber (A4C) view and 3.4(2.2-4.8) v/s 2.5(1.4-3.7)cms in major axis.The mean and range of Mitral annular area during end diastole and end systole was 6.2(3.0-9.4) v/s 4.4(2.3-7.8) cm². In overall groups mean and range of Anterior mitral leaflet (AML) and Posterior mitral leaflet (PML) length was 1.7(1.1-2.6) v/s .8(.4-1.2) cms in A4C view, 1.8(1.2-2.6) v/s .9(.5-1.3)cms in PSLAX view and 1.6(.4-2.2) v/s .8(.2-1.4) cms in Apical two chamber (A2C) view respectively, thickness of AML and PML(mean and range) was .2(.1-.4) v/s .3(.1-.5)cms respectively and chordae tendinae length attached to AML was 1.5(1.0-2.2)cms and of PML1.3(.7-1.9)cms. Conclusion: This study will help in finding the correct size of prosthesis for annuloplasty in population from hilly region.
