Initial Autonomic Parameters and Subsequent Short-Term Neurological Recovery after Inpatient Rehabilitation, in...

Area of Science:

• Neurology
• Autonomic Neuroscience
• Spinal Cord Injury Research

Background:

• The prognostic value of autonomic pathway integrity in acute traumatic cervical spinal cord injury (SCI) remains unclear.
• Assessing autonomic function may offer insights into neurological recovery following SCI.

Purpose of the Study:

• To investigate the relationship between heart rate variability (HRV) and sympathetic skin response (SSR) at initial evaluation and short-term neurological recovery in American Spinal Injury Association Impairment Scale (AIS) A/B tetraplegic patients.
• To determine if autonomic parameters predict motor/sensory score improvement or AIS grade changes.

Main Methods:

• A prospective cohort study involving 24 acute traumatic cervical AIS A/B SCI patients.
• Measured short-term HRV indices and SSR to supra-lesional stimuli at admission.
• Correlated autonomic parameters with neurological recovery using Spearman's correlation, Fisher's exact test, and Kaplan-Meier analysis.

Main Results:

• Sympathetic skin response (SSR) was present in 45.8% of patients initially.
• Only 20.8% of patients improved to AIS C; no significant association was found between SSR presence/absence and AIS improvement or time to recovery.
• Heart rate variability (HRV) indices did not correlate with improvements in motor or sensory scores.

Conclusions:

• Short-term neurological recovery in AIS A/B tetraplegic patients was not associated with initial HRV indices or SSR.
• Approximately half of patients with clinically complete SCI demonstrated preserved autonomic function.
• Findings contribute to understanding autonomic function in cervical SCI and support further research on neurophysiological parameters and recovery.