Autonomic dysfunction and osteoporosis after electrical burn

Area of Science:

• Bone Metabolism and Autonomic Nervous System Function
• Burn Injury Sequelae
• Neuro-Endocrine-Skeletal Axis

Background:

• The sympathetic nervous system plays a crucial role in regulating bone metabolism.
• Electrical burn injuries can lead to prolonged sympathetic nervous system dysfunction, evidenced by impaired sympathetic skin response (SSR).
• Bone resorption increases during the acute phase of burns, raising questions about long-term bone health.

Purpose of the Study:

• To investigate the potential link between prolonged sympathetic nervous system dysfunction and bone metabolism derangement in electrical burn patients.
• To explore the correlation between abnormal SSR and areal bone mineral density (BMD) in electrical burn survivors at least 6 months post-injury.

Main Methods:

• A cohort of 42 electrical burn patients (≥6 months post-injury) and 50 healthy controls were recruited, excluding individuals with pre-existing bone/joint diseases or neuropathy.
• Both groups underwent dual-energy X-ray absorptiometry (DXA) for areal BMD assessment and sympathetic skin response (SSR) testing.
• Statistical analysis involved independent t-tests and Pearson correlation coefficients using SPSS 16.0, with P<0.05 considered significant.

Main Results:

• Electrical burn patients exhibited significantly lower areal BMD compared to the control group (P<0.001).
• Burn patients showed significantly prolonged SSR latency and reduced amplitude (P<0.001) compared to controls.
• In burn patients, reduced areal BMD (lumbar vertebrae, femur neck, total femur) inversely correlated with SSR latency and directly with SSR amplitude.

Conclusions:

• Electrical burn survivors are at an elevated risk for reduced areal BMD, persisting long after the initial injury.
• Sympathetic nervous system dysfunction, manifested as impaired SSR, is significantly correlated with decreased areal BMD in these patients.