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Heart-rate variability in chronic traumatic brain injury
M L King1, S W Lichtman, G Seliger
1Department of Internal Medicine, Helen Hayes Hospitall, West Haverstraw, New York 10993, USA.
Brain Injury
|June 1, 1997
Summary
Heart-rate variability (HRV) abnormalities are present in traumatic brain injury (TBI) patients during recovery. This study found significant differences in HRV measures between TBI patients and controls, indicating autonomic nervous system dysfunction.
Area of Science:
- Neurology
- Cardiology
- Autonomic Neuroscience
Background:
- Heart-rate variability (HRV) assesses autonomic nervous system balance and cardiovascular tone.
- Neurological injuries, including traumatic brain injury (TBI), can impact autonomic function.
- Understanding HRV in TBI patients during recovery is crucial for managing cardiovascular health.
Purpose of the Study:
- To investigate the presence of abnormal heart-rate variability (HRV) in patients with traumatic brain injury (TBI).
- To determine if HRV alterations persist during the post-acute recovery phase following TBI.
Main Methods:
- Prospective, case/control study design.
- 24-hour ambulatory ECG monitoring was conducted.
- Seven TBI patients and seven healthy controls participated.
Main Results:
- Significant differences in time-domain HRV measures (RMSSD) were observed between TBI patients and controls (p=0.04).
- Four TBI patients exhibited abnormal standard deviation of RR intervals, compared to one control.
- Frequency-domain HRV analysis revealed significant differences in total power, low frequency, and high frequency between groups (all p < 0.05).
Conclusions:
- Abnormalities in both time and frequency domains of heart-rate variability are present in TBI patients during the post-acute recovery phase.
- These findings suggest persistent autonomic nervous system dysfunction following TBI.
- HRV analysis is a valuable tool for assessing cardiovascular tone and autonomic balance in TBI recovery.