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Mitral stenosis is a progressive valvular disorder most commonly caused by rheumatic heart disease, particularly in low- and middle-income countries. However, calcific degeneration in older adults also contributes to the disease burden. The narrowing of the mitral valve orifice leads to increased left atrial pressure, atrial enlargement, pulmonary venous congestion, and right-sided heart strain. Patients frequently present with dyspnea, exercise intolerance, atrial fibrillation, or thromboembolic complications. Diagnosis is established through echocardiography, which assesses valve morphology, severity of stenosis, transmitral gradients, and suitability for intervention. Percutaneous balloon mitral commissurotomy, also referred to as balloon mitral valvotomy, is the preferred minimally invasive treatment in appropriately selected patients, particularly those with pliable, non-calcified valves, minimal subvalvular involvement, and no significant mitral regurgitation or left atrial thrombus. When carefully applied, catheter-based management provides substantial symptomatic improvement, slows the progression of pulmonary hypertension, and reduces morbidity associated with untreated valvular disease. Clinicians participating in this course enhance their knowledge of the pathophysiology, diagnostic evaluation, and interventional management of mitral stenosis. Learners strengthen their ability to identify appropriate candidates for catheter-based treatment, interpret echocardiographic findings, and apply evidence-based criteria in patient selection. The course emphasizes procedural techniques, periprocedural considerations, complication recognition, and long-term follow-up strategies. By integrating these principles into practice, clinicians improve accuracy in clinical decision-making, reduce delays in treatment, and ensure optimal utilization of catheter-based therapies. Collaboration among the interprofessional team—including cardiologists, echocardiographers, anesthesiologists, interventional specialists, and nursing staff—plays a central role in enhancing procedural safety, coordinating postprocedural care, and supporting patient education. This collaborative approach fosters comprehensive, patient-centered care that improves outcomes for individuals undergoing catheter-based management of mitral stenosis. Objectives:

Clinicians participating in this course enhance their knowledge of the pathophysiology, diagnostic evaluation, and interventional management of mitral stenosis. Learners strengthen their ability to identify appropriate candidates for catheter-based treatment, interpret echocardiographic findings, and apply evidence-based criteria in patient selection. The course emphasizes procedural techniques, periprocedural considerations, complication recognition, and long-term follow-up strategies. By integrating these principles into practice, clinicians improve accuracy in clinical decision-making, reduce delays in treatment, and ensure optimal utilization of catheter-based therapies. Collaboration among the interprofessional team—including cardiologists, echocardiographers, anesthesiologists, interventional specialists, and nursing staff—plays a central role in enhancing procedural safety, coordinating postprocedural care, and supporting patient education. This collaborative approach fosters comprehensive, patient-centered care that improves outcomes for individuals undergoing catheter-based management of mitral stenosis. Objectives: Identify suitable candidates for catheter-based interventions in mitral stenosis, considering both clinical and echocardiographic criteria. Apply the procedural steps and best practices of percutaneous balloon mitral commissurotomy to ensure safe and effective treatment of patients with mitral stenosis. Interpret hemodynamic data before and after percutaneous balloon mitral commissurotomy to assess procedural success, and evaluate the Wilkin score along with other anatomical factors—including the presence and type of left atrial thrombi—that influence the appropriateness and outcomes of the procedure. Collaborate with cardiologists, interventionalists, nurses, and imaging specialists to enhance patient outcomes in the catheter-based management of mitral stenosis. Access free multiple choice questions on this topic.

Mitral stenosis is a progressive valvular disorder that results in left atrial (LA) enlargement, atrial fibrillation, and heart failure.[1] Despite advances in modern medicine, rheumatic heart disease remains the most common cause of mitral stenosis, especially in low- and middle-income countries.[2] Rheumatic mitral stenosis usually presents in patients aged between 20 and 40 years, about 10 to 15 years after the onset of rheumatic fever. In the United States, mitral stenosis secondary to rheumatic heart disease most commonly presents in the immigrant population and those with limited access to healthcare facilities.[3] Calcific degenerative mitral valve stenosis is another cause of mitral stenosis, but it is far less common and typically seen in older adults.[4] Patients with symptomatic mitral stenosis usually present with symptoms of heart failure, atrial fibrillation, or thromboembolism. Risk factors for rheumatic mitral stenosis include a history of rheumatic fever and a previously untreated streptococcus infection.[5] Some data suggest that patients with chronic kidney diseases and dialysis are at increased risk for calcific, degenerative mitral stenosis.[6] The key physical examination findings in hemodynamically significant mitral stenosis may include irregular pulse (due to atrial fibrillation), prominent a wave in the jugular venous examination, tapping apex beat, signs of pulmonary hypertension/right-heart failure, an opening snap, and the classic low-pitched, middiastolic rumbling murmur with presystolic accentuation.[7] A chest radiograph may show the prominence of the pulmonary arteries, the straightening of the left heart border, the LA, and signs of pulmonary edema.[8] The electrocardiogram may show atrial fibrillation or evidence of LA enlargement and right ventricular hypertrophy.[9] The 2-dimensional and Doppler echocardiogram is the best imaging modality for diagnosing mitral stenosis and assessing its severity and hemodynamic consequences.[10]

The key physical examination findings in hemodynamically significant mitral stenosis may include irregular pulse (due to atrial fibrillation), prominent a wave in the jugular venous examination, tapping apex beat, signs of pulmonary hypertension/right-heart failure, an opening snap, and the classic low-pitched, middiastolic rumbling murmur with presystolic accentuation.[7] A chest radiograph may show the prominence of the pulmonary arteries, the straightening of the left heart border, the LA, and signs of pulmonary edema.[8] The electrocardiogram may show atrial fibrillation or evidence of LA enlargement and right ventricular hypertrophy.[9] The 2-dimensional and Doppler echocardiogram is the best imaging modality for diagnosing mitral stenosis and assessing its severity and hemodynamic consequences.[10] Medical therapy is used as an initial symptomatic treatment for severe mitral stenosis; however, it does not improve the long-term outcomes of the disease.[11] As assessed by echocardiography, percutaneous mitral balloon commissurotomy (PMBC) is recommended as the first-line treatment for rheumatic mitral stenosis in patients with suitable mitral valve anatomy. Meanwhile, surgical mitral valve repair/replacement is limited to patients whose valves are unsuitable (see StatPearls' references "Mitral Valve Repair" and "Minimally Invasive Mitral Valve Surgery").[12][13] Valves designed for transcatheter aortic valve replacement have been used in a percutaneous transcatheter mitral valve replacement technique to treat degenerative mitral stenosis.[14] PMBC treats mitral stenosis by splitting the fusion of the mitral valve commissures, and it is most effective in rheumatic mitral stenosis and certain forms of congenital mitral stenosis.[15] This activity will provide a detailed description of the mitral valve, the pathology of mitral stenosis, and possible options for catheter management, including indications, contraindications, complications, and the clinical significance of catheter management.

The complications of PMBC depend on the operator's expertise and patient selection. Vascular access site complications are the most common complications in PMBC, which are compatible with a right heart catheterization. The common vascular access-related complications include hematoma, retroperitoneal bleeding, arteriovenous fistulae, and pseudoaneurysm.[42] The complications specific to PMBC are rare and may include: thromboembolic events (0%-4%), cardiac tamponade (0%-2%), MR (1%-9%), and procedure-related mortality is less than 0.5%.[25] The interatrial septal defect after transseptal puncture usually results in a trace intracardiac shunt, and the hemodynamically significant shunt is very rare.[43][44]

Effective catheter management of mitral stenosis requires clinicians to integrate advanced procedural skills with evidence-based strategies for patient selection, periprocedural care, and postprocedural monitoring. Physicians and advanced practitioners must be proficient in interpreting echocardiographic findings, recognizing hemodynamic instability, and coordinating anticoagulation strategies. Nurses play a vital role in patient education, procedural preparation, and hemodynamic monitoring, while pharmacists ensure safe and effective medication management, particularly with anticoagulation and adjunctive therapies. Each professional must apply critical thinking and clinical judgment to anticipate complications, intervene early, and support recovery. Percutaneous transcatheter mitral valve procedures are complex procedures that require evaluation from multiple specialties to determine the best procedural approach for optimal outcome.[49] Interprofessional communication and structured care coordination are essential to optimizing outcomes. Seamless collaboration between cardiologists, interventionalists, anesthesiologists, nurses, and pharmacists fosters shared decision-making and minimizes errors. Strategies such as multidisciplinary valve team discussions, standardized communication tools, and protocol-driven follow-up care enhance patient safety and continuity of care. By working together in a coordinated manner, the care team not only improves technical success and reduces complications but also strengthens patient trust, satisfaction, and long-term outcomes.