**17. Conclusions**

Deformation imaging, particularly in the form of global longitudinal strain, has evolved as a powerful tool in the evaluation of ventricular function in patients with aortic valve disease. GLS is particularly suited to detect subclinical LV dysfunction, before a drop in LV ejection fraction, providing the opportunity to intervene earlier to prevent serious and permanent LV dysfunction. The role of GLS in the management of aortic stenosis is quite robust, illuminating nuances of LV dysfunction in aortic valve disease such as impact in severity of AS, prognosis, timing for surgery and interventions, low gradient aortic stenosis and presence of associated coronary artery disease, among others. Similar added value has been demonstrated in the application of GLS in the detection of subclinical LV dysfunction in patients with aortic regurgitation. Very little information exists in the use of GLS in patients with mixed aortic valve disease providing an opportunity for future research in this important group of patients with aortic valve disease.
