Association between left ventricular function and paraprotein type in patients with multiple myeloma.

Area of Science:

• Cardiology
• Hematology
• Oncology

Background:

• Multiple myeloma (MM) can cause cardiac damage, but the specific impact of different monoclonal (M) protein types remains unclear.
• Understanding the relationship between M protein levels and cardiac function is crucial for managing MM patients.

Purpose of the Study:

• To investigate the association between serum M protein levels and echocardiographic measures of cardiac structure and function in MM patients.
• To differentiate the cardiac effects based on the type of M protein (intact M protein vs. free light chains).

Main Methods:

• Echocardiography was performed on 184 MM patients undergoing pre-transplant screening.
• Serum levels of intact immunoglobulin M protein and free light chains (kappa/lambda) were measured.

Main Results:

• In non-light chain MM (non-LCMM), M protein correlated with left atrial volume index, E/e', and systolic pulmonary arterial pressure.
• In light chain MM (LCMM), FLC-λ correlated with left ventricular ejection fraction, end-systolic dimension, and end-systolic volume.
• Serum M protein and hematocrit were independent predictors of left atrial volume index in non-LCMM patients.

Conclusions:

• Increased serum M protein is associated with left ventricular diastolic dysfunction in MM.
• Increased serum FLC-λ concentration correlates with impaired left ventricular systolic function.
• The type of paraprotein influences the effect of M protein on left ventricular function in MM.