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Understanding mitral valve prolapse (MVP)
1Department of Medicine, University of Hawaii, John A. Burns School of Medicine, Honolulu.
Abstract:
In asymptomatic or symptomatic patients with an audible click and late systolic murmur, mitral valve prolapse can be assumed to be present, the pathologic-anatomical substrate of which is characterized by myxomatous changes in the mitral valve leaflets and collagen degeneration of the chordae tendineae. The conclusion that all persons with a systolic click have a diseased mitral valve and are at risk of complications is probably excessive. In the presence of an unequivocally-audible click and/or late systolic murmur, an echocardiogram for confirmation of the diagnosis is not necessary. If the auscultatory findings are uncertain, an M-mode recording and, because of its high sensitivity and specificity, a two-dimensional display from the parasternal long-axis view should be obtained. From the apical four-chamber view, false-positive findings may be incurred. A small percentage of patients with mitral valve prolapse have complaints which can be assumed attributable to disturbances in the neuroendocrine system (Tables 1 and 3). To what extent a relationship actually exists between autonomic dysfunction and mitral valve prolapse and whether or not this is coincidental, remains unclear. Treatment of the symptoms with anxiolytic drugs or beta-adrenergic receptor blocking agents is only indicated for disabling complaints if reassurance and psychological support are ineffective. Complaints of chest pain are atypical for angina pectoris. Supraventricular and ventricular arrhythmias may be observed (Table 3), the initial step in the management of which is to advise avoidance of irritants such as coffee, tobacco and emotional stress. Medical treatment is only indicated for hemodynamically-meaningful arrhythmias and in those patients in whom an increased risk of sudden death is present.(ABSTRACT TRUNCATED AT 250 WORDS)
Insights
Mitral valve prolapse diagnosis relies on audible clicks and murmurs, but echocardiograms aren't always needed. Management focuses on symptoms and arrhythmias, with medication reserved for severe cases.
Area of Science:
- Cardiology
- Cardiac Auscultation
- Echocardiography
Background:
- Mitral valve prolapse (MVP) is often diagnosed based on clinical findings like systolic clicks and late systolic murmurs.
- The underlying pathology involves myxomatous changes in valve leaflets and chordae tendineae degeneration.
- The association between MVP and symptoms like autonomic dysfunction requires further clarification.
Purpose of the Study:
- To evaluate the diagnostic necessity of echocardiography in suspected mitral valve prolapse.
- To discuss the management of symptoms and arrhythmias associated with MVP.
- To clarify the relationship between MVP and neuroendocrine disturbances.
Main Methods:
- Clinical auscultation for audible clicks and late systolic murmurs.
- Echocardiography (M-mode and 2D) for uncertain auscultatory findings.
- Review of patient complaints and management strategies for arrhythmias.
Main Results:
- An audible click and late systolic murmur suggest MVP, but echocardiography is not always required for diagnosis.
- Echocardiography, particularly 2D from the parasternal long-axis view, is sensitive and specific; apical views may yield false positives.
- A small subset of MVP patients experience symptoms potentially linked to neuroendocrine issues; the exact relationship is unclear.
- Arrhythmias are observed, with initial management involving lifestyle modifications; medical treatment is reserved for hemodynamically significant cases or high-risk patients.
Conclusions:
- Clinical findings alone can suggest MVP, reducing the routine need for echocardiography.
- Management of MVP should address associated symptoms and arrhythmias, with a cautious approach to pharmacological interventions.
- Further research is needed to elucidate the connection between autonomic dysfunction and mitral valve prolapse.