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[Mitral valve prolapse]
A Schmeisser1, F A Flachskampf
1Medizinische Klinik II mit Poliklinik Universität Erlangen.
Insights
Mitral valve prolapse is common but rarely causes severe complications like stroke. New diagnostic criteria help differentiate between asymptomatic cases and those with potential risks, clarifying its true prevalence and impact.
Area of Science:
- Cardiology
- Diagnostic Imaging
- Epidemiology
Context:
- Mitral valve prolapse (MVP) diagnosis has historically been challenging due to high prevalence and varied clinical outcomes.
- Previous associations with severe cardiovascular events like embolic insults and sudden cardiac death created a diagnostic dilemma.
- Advancements in echocardiography (M-mode and 2D) led to increased detection, particularly in younger populations.
Purpose:
- To clarify the actual prevalence and clinical significance of mitral valve prolapse using refined diagnostic criteria.
- To investigate the association between mitral valve prolapse and severe cardiovascular complications, including cerebrovascular insults in young patients.
- To re-evaluate the risk stratification for patients diagnosed with mitral valve prolapse.
Summary:
- Recent studies utilizing stricter diagnostic criteria for mitral valve prolapse (MVP) indicate a population prevalence of 2-3% (1.3% for classic MVP), with no significant age or sex predilection.
- The study found that MVP patients do not exhibit higher rates of cerebrovascular insults, congestive heart failure, or atrial fibrillation compared to the general population.
- Mitral insufficiency was noted as more frequent in MVP patients, and importantly, young patients with a history of cerebrovascular insult did not show increased rates of MVP.
Impact:
- The implementation of refined, morphology-based diagnostic criteria for mitral valve prolapse has resolved the previous diagnostic dilemma.
- Findings suggest that most mitral valve prolapse cases are asymptomatic and do not significantly increase the risk for major cardiovascular events like stroke.
- This research aids in more accurate patient management and reduces unnecessary anxiety associated with a previously over-diagnosed condition.
Abstract:
Mitral valve prolapse has previously been found to be associated with severe cardiovascular complications such as embolic insults, infectious endocarditis, and sudden cardiac death. However, at the same time, in particular after adopting M-mode and 2D echo for diagnosis, prevalence of the disease was found to be very high, especially in the young. The dilemma of a disease which is frequent and mostly asymptomatic, but in some cases has catastrophic complications, has been solved by implementation of more restrictive diagnostic criteria based on an appreciation of the spatial morphology of the mitral annulus. These criteria call for diagnosis exclusively based on long axis views and a prolapse of > 2 mm beyond a line connecting the leaflet insertion points. "Classic prolapse" additionally requires diastolic thickness of the mitral leaflets of at least 5 mm. Two recent studies, a population-based study of mitral valve prolapse prevalence, and a case-control study of juvenile stroke patients compared to a group of young patients without a history of stroke, shed further light on this disease. The authors found that prevalence of mitral valve prolapse in an average population is 2-3% (1.3% for classic prolapse), without age or sex preponderance; the rate of cerebrovascular insults, congestive heart failure, and atrial fibrillation of patients with prolapse does not exceed that of the rest of the population; however, mitral insufficiency is more frequent; young patients with a history of cerebrovascular insult do not have higher mitral valve prolapse rates than young patients without previous insult.