Ocular microtremor in brain stem death

Area of Science:

• Neuroscience
• Medical Diagnostics

Background:

• Brain stem death diagnosis relies on clinical criteria.
• Ocular microtremor (OMT) is a physiological eye tremor originating from brain stem impulses.
• OMT recording has shown potential in assessing brain stem viability.

Purpose of the Study:

• To determine if ocular microtremor (OMT) measurement can establish brain stem death.
• To evaluate OMT as a diagnostic tool for brain stem function.

Main Methods:

• Ocular microtremor (OMT) recordings were obtained from 32 patients suspected of brain stem death.
• A piezoelectric strain gauge technique was employed, with a probe placed on the anesthetized sclera.
• Signals were recorded and analyzed using an electrocardiographic tape analyzer.

Main Results:

• No OMT activity was detected in 28 patients diagnosed with brain stem death.
• OMT activity was present in three patients initially showing brain stem function, disappearing upon subsequent diagnosis of brain stem death.
• One patient with absent clinical brain stem function showed OMT activity, later found to have bacterial cerebritis.

Conclusions:

• Ocular microtremor (OMT) appears to be a sensitive indicator of brain stem life.
• OMT measurement could become a valuable tool in the assessment of brain stem death.
• Further research into OMT's role in diagnosing brain stem death is warranted.