Severe mitral regurgitation caused by eosinophilic endocarditis

Area of Science:

• Cardiology
• Hematology
• Genetics

Background:

• Hypereosinophilic syndrome (HES) can lead to cardiac complications, including endomyocardial fibrosis and valvular dysfunction.
• Loeffler's endocarditis is a specific manifestation of HES involving eosinophilic infiltration of the endocardium and myocardium.
• Severe mitral regurgitation and heart failure are significant potential outcomes of untreated HES affecting the heart.

Purpose of the Study:

• To present a case of Loeffler's endocarditis presenting with severe mitral regurgitation and heart failure.
• To illustrate the diagnostic process involving echocardiography, cardiac MRI, and genetic analysis.
• To demonstrate the efficacy of combined pharmacological treatment in achieving remission and reversing cardiac pathology.

Main Methods:

• Clinical presentation of a patient with heart failure and severe mitral regurgitation.
• Diagnostic imaging including echocardiography and cardiac magnetic resonance imaging (CMR).
• Laboratory investigations including eosinophil counts and genetic mutation analysis (platelet-derived growth factor receptor alpha).

Main Results:

• Diagnosis of Loeffler's endocarditis confirmed by clinical, imaging, and laboratory findings.
• Intracardiac mass, thrombi, and endomyocardial fibrosis identified.
• Successful treatment with prednisone and a tyrosine kinase inhibitor led to remission of hypereosinophilia.
• Significant improvement in mitral regurgitation from severe to mild post-treatment.

Conclusions:

• Loeffler's endocarditis, a manifestation of HES, can cause severe mitral regurgitation and heart failure.
• Early diagnosis and combined therapy with corticosteroids and tyrosine kinase inhibitors can lead to clinical improvement and reversal of cardiac damage.
• This case suggests that severe mitral regurgitation in HES may be reversible with appropriate medical management, potentially avoiding surgical intervention.