Persisting Muscle Dysfunction in Cushing's Syndrome Despite Biochemical Remission

Area of Science:

• Endocrinology
• Neuromuscular Disorders
• Clinical Research

Background:

• Glucocorticoid-induced myopathy is a hallmark of endogenous Cushing's syndrome (CS).
• The long-term prognosis of muscle function following CS remission remains largely uncharacterized.

Purpose of the Study:

• To evaluate the long-term muscle function in patients after achieving remission of endogenous CS.
• To identify factors predicting persistent muscle dysfunction.

Main Methods:

• An observational, longitudinal cohort study was conducted within the German Cushing's Registry.
• Muscle strength was assessed using hand grip strength and chair rising tests in 88 patients at diagnosis and up to 4 years post-remission.

Main Results:

• Hand grip strength decreased significantly after 6 months of remission and did not improve over 4 years.
• Chair rising test performance showed initial improvement but remained impaired compared to controls.
• Age, waist-to-hip ratio, and HbA1c at baseline predicted long-term muscle dysfunction.

Conclusions:

• Cushing's syndrome-associated myopathy does not resolve spontaneously following remission.
• Persistent muscle dysfunction negatively impacts quality of life.
• Effective interventions are needed to address long-term muscle dysfunction in CS patients.