Impact of mitral annular calcification on hemodynamic effect in mitral stenosis in multiple valve disease: relevant or not

Abstract

Abstract Funding Acknowledgements Type of funding sources: None. Introduction Prevalence of mitral annulus calcification (MAC) and degenerative mitral stenosis thus elevated transmitral gradient (TMG) is increased with age and multivalve involvement. The management of degenerative multivalve disease is challenging, as is identification of the presence of multivalve involvement and its hemodynamic impact because of interaction between two or more valve lesions especially in degenerative valve disease. Hemodynamic interaction between significant aortic stenosis and mitral annular calcification is often combined with diastolic disfunction which can result in LA enlargement and abnormal atrioventricular coupling and left atrial and ventricular remodeling. Purpose Study aimed to assess the effect of MAC on mitral valve stenosis in patients with multiple valve disease of degenerative origin. Method We retrospectively analyzed 78 patients with elevated transmitral gradient defined as an elevated TMG >4mmHg, MAC in multivalve involvement, mainly degenerative significant aortic valve stenosis who were treated in our clinic from 2018 to 2021. We excluded patients with prior cardiac surgery, congenital heart disease, hypertrophic obstructive cardiomyopathy and with heart rate >100 bpm at time of study and significant mitral regurgitation. Baseline demographic data were extracted from the electronic medical record and echocardiographic data were analyzed from electronic saved data. Results Study identified a total of 78 patients (average age 71,89 years, 64% females). Of 57 analyzed patients 32% patients had severe MAC and calcification of chordae, and 68% patients had MAC and mild or no significant chordae calcification. Patients with aortic gradients, severe aortic stenosis (AVAi 0,80 cm/m2) were observed more often in patients with severe MAC and significant chordae calcification than in those with nonsevere MAC (p < 0.043).There was no significant difference in mitral annular distension between groups. Baseline mean MV gradients were 6,5+-1.5 mm Hg. Mean MVA (continuity equation) was 1,5+-0.4 cm2, and MVAi 0,8+-0,2 cm/m2, mean LA volume 70 ml/m2, mean E/e 35, mean EF LV 68% and mean GLS -14. Conclusion Result suggest that increasing transmitral gradient if superimposed on severe MAC with only modest mitral stenosis will result in a high mean transmitral gradient. The presence of elevated pressure transmitral gradient in patients with more severe aortic stenosis and more severe MAC combined with chordae calcification may imply hemodynamic effect or stress on mitral valve degeneration in multiple valve involvement. Other imaging modalities and further investigation for better understanding effect of hemodynamic stress in multiple valve disease are needed. These observations need to be evaluated on larger cohorts of patients during a longer period of time.