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Computer aided analysis of heart rate variability in brain death
D Knüttgen1, K zur Nieden, M R Müller-Gorges
1Department of Anesthesiology, Kliniken der Stadt Köln, Cologne, Germany.
International Journal of Clinical Monitoring and Computing
|February 1, 1997
Summary
Brain death significantly alters heart rate patterns, drastically reducing heart rate variability (HRV). This computer-analyzed ECG method may aid in diagnosing brain death by quantifying these changes.
Area of Science:
- Neurosurgery
- Cardiology
- Neurology
Background:
- Brain death signifies the irreversible loss of all brain functions, including the brainstem.
- Assessing brain death often involves complex neurological examinations.
- Heart rate variability (HRV) reflects autonomic nervous system function.
Purpose of the Study:
- To investigate changes in heart rate and HRV in brain dead patients.
- To evaluate the potential of HRV analysis as an adjunct diagnostic tool for brain death.
Main Methods:
- Surface electrocardiography (ECG) was recorded for five minutes in 40 neurosurgical patients.
- Patients were divided into two groups: 20 brain dead and 20 non-brain-dead controls.
- Computer analysis (ProSciCard, Medisyt, Germany) determined mean heart rate and HRV indices.
Main Results:
- Brain dead patients exhibited a significantly higher mean heart rate compared to controls.
- All measured HRV parameters were drastically reduced in brain dead individuals.
- These HRV changes indicate a loss of brainstem-mediated autonomic regulation.
Conclusions:
- Brain death is associated with distinct, quantifiable alterations in heart rate patterns.
- Reduced HRV is a significant indicator following the manifestation of brain death.
- Computer-aided HRV analysis presents a potentially valuable, non-invasive method for brain death diagnosis.