Mitral Regurgitation is NOT a Recognized Primary Complication of Dengue
Mitral regurgitation is not listed among the established cardiac complications of dengue infection. The most frequent cardiac manifestations of dengue are arrhythmias, pericarditis, myocarditis, and deterioration in myocardial function—not valvular disease 1.
Recognized Cardiac Complications of Dengue
According to the most recent 2025 European guidelines on cardiac imaging in tropical diseases, cardiac involvement in dengue occurs in 12-50% of hospitalized patients and includes 1:
- Arrhythmias (most common)
- Pericarditis and pericardial effusion
- Myocarditis with LV systolic dysfunction
- Deterioration in myocardial function
- Rare complications: myocardial infarction, coronary dissection, intramural hematoma
Recent research confirms these findings, with a 2026 cross-sectional study of 919 dengue patients showing pericardial effusion (26%), elevated troponin (38%), and ECG abnormalities (10%)—but no mention of mitral regurgitation as a complication 2.
Important Clinical Context
When Mitral Regurgitation Appears with Dengue
The evidence shows mitral regurgitation occurring in dengue patients only in these specific scenarios:
Pre-existing mitral valve disease: A 2025 case report described dengue myocarditis in a patient who already had prosthetic mitral and aortic valves from prior valve replacement 3
Secondary infective endocarditis: A 2026 case report documented dengue-related immunosuppression leading to secondary bacterial infective endocarditis with mitral valve vegetation and resultant mitral regurgitation 4
These represent complications OF complications—not direct dengue-related valvular pathology.
Clinical Pitfalls to Avoid
Do not attribute new mitral regurgitation directly to dengue infection—look for alternative explanations including pre-existing valve disease or secondary bacterial endocarditis
Dengue-associated immunosuppression can predispose to secondary bacterial infections, including infective endocarditis 4
Cardiac involvement in dengue is significantly underdiagnosed in endemic areas, with only a small percentage of patients receiving cardiac evaluation 1
Any echocardiographic abnormality in dengue is associated with adverse outcomes 1, so cardiac assessment should be performed in high-risk patients
Who Needs Cardiac Evaluation in Dengue
Based on 2026 research identifying predictors of cardiac involvement 2:
- Age >60 years
- Presence of warning signs
- Anemia
- Thrombocytopenia
- Elevated serum creatinine
- Hypoalbuminemia
- Elevated D-dimer levels
Echocardiography should be performed in patients with ECG abnormalities, hemodynamic instability, or elevated cardiac biomarkers 5.