Overview
Mitral anulus calcification (MAC) involves the deposition of calcium in the mitral valve annulus, often associated with hemodynamic, valvular, rhythm, and conduction abnormalities, particularly in elderly populations 13.Diagnosis
Key Diagnostic Criteria: Presence of dense echogenic bands posterior to the mitral valve on echocardiography 3.
Recommended Tests:
- Echocardiography: Essential for grading severity (minimal/mild <5 mm, moderate/severe ≥5 mm) 3.
- Electrocardiogram (ECG): To detect conduction disturbances such as left bundle branch block, intraventricular conduction delay, and atrial fibrillation 23.
Grading:
- Type I MAC: Near the conduction system, associated with higher prevalence of conduction defects 2.
- Severity: Mild (<5 mm) vs. moderate/severe (≥5 mm), correlating with increased clinical implications 3.Management
First-Line Treatments:
- Symptomatic Relief: Address underlying conditions like atrial fibrillation and congestive heart failure 3.
- Pacemaker Placement: Indicated for symptomatic bradyarrhythmias, particularly in patients with MAC 4.
Adjunctive Treatments:
- Rate Control/Rhythm Control Medications: For atrial fibrillation (e.g., beta-blockers, antiarrhythmics) 3.
- Heart Failure Management: Diuretics, ACE inhibitors, or ARBs as indicated 3.Special Populations
Elderly: Higher risk of stroke, conduction disturbances, and bradyarrhythmias 1234.
Comorbidities: MAC significantly correlates with left atrial enlargement, aortic valve sclerosis, and mitral regurgitation 3.Key Recommendations
Echocardiographic Assessment for Severity: Regular echocardiographic evaluation to assess MAC severity (≥5 mm) is crucial for prognostic purposes (Evidence: Moderate) 3.
Monitoring Conduction Abnormalities: Routine ECG monitoring is recommended in patients with MAC, especially those with Type I calcification near the conduction system (Evidence: Moderate) 2.
Pacemaker Consideration for Bradyarrhythmias: Patients with symptomatic bradyarrhythmias and MAC should be evaluated for pacemaker implantation (Evidence: Moderate) 4.References
1 Malaterre HR, Habib G, Leude E, Malmejac C, Vaillant A, Djiane P. Embolic thrombus on mitral anulus calcification. Journal of the American Society of Echocardiography : official publication of the American Society of Echocardiography 1996. link90487-3)
2 Takamoto T, Nitta M, Taniguchi K. Conduction disturbances associated with mitral anular calcification. The Bulletin of Tokyo Medical and Dental University 1987. link
3 Mellino M, Salcedo EE, Lever HM, Vasudevan G, Kramer JR. Echographic-quantified severity of mitral anulus calcification: prognostic correlation to related hemodynamic, valvular, rhythm, and conduction abnormalities. American heart journal 1982. link90495-1)
4 Nair CK, Sketch MH, Desai R, Mohiuddin SM, Runco V. High prevalence of symptomatic bradyarrhythmias due to atrioventricular node-fascicular and sinus node-atrial disease in patients with mitral anular calcification. American heart journal 1982. link90496-3)