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Feasibility of eliciting the H reflex in the masseter muscle in patients under general anesthesia
Sedat Ulkatan1, Ana Maria Jaramillo1, Maria J Téllez1
1Department of Intraoperative Neurophysiology, Mount Sinai West Hospital, New York, NY, USA.
Objective:
To explore the feasibility of eliciting the brainstem H reflex in the masseter muscle in patients under general anesthesia.
Methods:
We electrically stimulated the masseteric nerve, a branch of the trigeminal nerve, and recorded ipsilateral masseteric and temporalis muscle responses. We tested eight patients who presented with trigeminal neuralgia; one patient had a temporal bone tumor and one patient had a brainstem arteriovenous malformation. All responses were elicited when patients were under general anesthesia and before the initiation of surgery.
Results:
The H reflex in the masseter muscle was reliably elicited in 70% of the patients. The reflexes met the usual criteria for the H reflex because they were elicited below the threshold of the direct M response, and their amplitudes decreased when the M response increased with stronger stimuli. The mean onset latencies of the masseter H reflex and the M response were 5.4±1.3ms and 2.6±0.6ms, respectively.
Conclusions:
In the present study, we provide evidence of the feasibility of eliciting the H reflex in the masseter muscles of patients under general anesthesia.
Significance:
The H reflex of the masseter muscle may represent a new method available for intraoperative monitoring. Specifically, this method may be important for the monitoring of brainstem functional integrity, particularly in the midbrain and mid-pons, in addition to the trigeminal nerve path.
