Muscle wasting in young patients with dilated cardiomyopathy

Area of Science:

• Cardiology
• Clinical Medicine
• Body Composition Analysis

Background:

• Muscle wasting (sarcopenia) is a significant complication of chronic diseases like heart failure, contributing to adverse outcomes.
• It is a major cause of disability, morbidity, and mortality in heart failure patients.
• The incidence and factors associated with muscle wasting in younger dilated cardiomyopathy patients are not well understood.

Purpose of the Study:

• To investigate the incidence of muscle wasting in patients with dilated cardiomyopathy younger than 55 years.
• To identify factors associated with muscle wasting in this specific patient population.

Main Methods:

• A cohort of symptomatic patients with non-ischaemic dilated cardiomyopathy was studied.
• Dual-energy X-ray absorptiometry (DXA) was used to assess body composition and define muscle wasting based on appendicular skeletal muscle mass relative to height squared.
• Specific diagnostic thresholds for muscle wasting were applied: <5.45 kg/m² for women and <7.26 kg/m² for men.

Main Results:

• Nearly half (47.3%) of the 55 included patients (mean age 37.3 years) exhibited muscle wasting.
• Patients with muscle wasting had significantly lower left ventricular ejection fraction (mean 21.4%), reduced 6-minute walk distance, and higher New York Heart Association functional class.
• A higher hospitalization rate was observed in patients with muscle wasting.

Conclusions:

• Muscle wasting is prevalent in younger patients diagnosed with dilated cardiomyopathy.
• The presence of muscle wasting correlates with poorer clinical status, including reduced heart function and increased disease severity.
• These findings underscore the importance of assessing muscle mass in younger heart failure patients to identify those at higher risk.