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Hemodynamic response with passive neck flexion in brain death
Y Kuwagata1, H Sugimoto, T Yoshioka
1Department of Traumatology, Osaka University Medical School, Japan.
Neurosurgery
|August 1, 1991
Summary
Passive neck flexion in brain-dead patients can trigger a sympathetic nervous system response, causing temporary increases in blood pressure and heart rate. This hemodynamic response is blocked by trimethaphan camsilate.
Area of Science:
- Neurology
- Physiology
Background:
- Brain death diagnosis requires confirmation of absent brainstem reflexes.
- Hemodynamic monitoring is crucial in intensive care settings.
Purpose of the Study:
- To investigate the hemodynamic response to passive neck flexion in brain-dead patients.
- To determine the neural pathways involved in this response.
Main Methods:
- Studied 12 brain-dead patients over 14 months.
- Observed hemodynamic changes (blood pressure, heart rate) after passive neck flexion.
- Administered trimethaphan camsilate to assess pathway involvement.
Main Results:
- Passive neck flexion elicited a hemodynamic response in 10 of 12 patients.
- Observed increases in blood pressure and heart rate peaking around 2 minutes.
- Trimethaphan camsilate completely suppressed these responses.
Conclusions:
- Passive neck flexion can induce a transient sympathetic nervous system response in brain-dead individuals.
- The efferent pathway of this response is mediated by the sympathetic nervous system.