The key mechanical effect is separation of fused mitral commissures, the junctions where the valve leaflets meet. Balloon inflation creates a wider passage at this junction, allowing blood to move more readily from the left atrium into the left ventricle. This explains how a catheter-based intervention can improve forward flow through the narrowed valve.
By enlarging the valve opening, treatment can reduce pressure in the left atrium. Lower atrial pressure may lessen pulmonary congestion, while improved flow can support overall cardiac function. These linked effects explain the clinical goal of treating symptomatic narrowing: reducing the hemodynamic burden created by restricted movement of blood through the mitral valve.
Rheumatic disease is particularly relevant because it can produce leaflet fusion, the structural feature targeted by balloon inflation. Mitral Balloon Valvuloplasty is therefore considered mainly for patients whose stenosis is symptomatic and whose valve anatomy is suitable for commissural separation. The decision depends on clinical assessment as well as the presence of appropriate valve changes.
Imaging and clinical assessment work together before and during Mitral Balloon Valvuloplasty. Clinical findings help establish whether symptoms are associated with mitral stenosis, while imaging helps identify the valve and guide catheter positioning across it. Together, these assessments support candidacy decisions and help direct balloon inflation toward the narrowed valve opening.
During the intervention, a balloon-tipped catheter is guided into the heart and advanced across the stenotic mitral valve. Accurate positioning is essential because the balloon must span the narrowed opening before inflation. Once positioned, inflation separates fused commissures and enlarges the passage, producing the intended improvement in blood flow between the two left-sided chambers.
Clinicians primarily consider this approach for suitable patients with symptomatic mitral stenosis, especially when rheumatic disease has caused leaflet fusion. The expected outcome is not simply a larger valve opening; it is relief of the downstream effects of obstruction, including elevated left atrial pressure and pulmonary congestion, with potential improvement in cardiac function.