Ali Haider, MD on Instagram: "Mitral stenosis is when the mitral valve is severely narrowed, which is classically caused by rheumatic heart disease. One of the risks of this is developing atrial fibrillation which increases stroke risk, but folks with MS have a much higher stroke risk than run-of-the-mill afib with huge atria and more stagnant flow. This crazy TEE shows how this can happen. When the valve is so narrow, it increases pressure in the left atrium, and can cause stagnation of blood f