The awake craniotomy is a well-accepted surgical technique for resection of low-grade gliomas (LGGs).1 The procedure, which utilizes intraoperative electric stimulation, is able to preserve the functional integrity of structures surrounding the tumor. This asleep-awake-asleep (AAA) surgical method is associated with low rates of swelling, seizures, severe permanent deficits, and mortality. The patient, placed in a lateral decubitus position, is asleep for the often stressful surgical opening, then awakened to cooperate with the surgeon during the procedure, then asleep for the surgical closing.
The AAA technique works well for surgery on LGGs, which often affect young adults. However, the technique has its limitations. In surgery on high-grade gliomas (HGGs), the lateral decubitus position can lead to difficulties with airway management in older patients, who are more likely to develop HGGs.1
An alternative to the AAA craniotomy is the fully awake procedure, which is performed without any sedation. Obviously, there are no anesthetic-related airway limitations with this technique. Another advantage is that no time needed to wake up the patient, which can take from 10 to 40 minutes, for the patient-participation phase of the operation. However, some patients report intraoperative pain (20% to 44%), considerable discomfort (20% to 29%), anxiety (29%), and fear (14%) with the fully awake method.1 A recent study explored a novel method for reducing the perioperative discomfort and trauma associated with fully awake craniotomy, while maintaining its excellent oncologic and functional results.
Ilyess Zemmoura, MD, PhD, of the CHRU de Tours, Bretonneau Hospital, in France, and his team recently offered the option of hypnosis as sedation (hypnosedation) to all patients at their medical center who were scheduled to undergo awake craniotomy for LGG resection. They also offered the novel alternative to 2 patients scheduled for HGG resection.
Forty-three operations using hypnosedation were performed on 37 patients, ranging in age from 18 to 67 years, between May 2011 and April 2015. Six of the patients underwent repeat procedures for tumor regrowth during the study. Of the 37 patients, 5 had prior surgery under general anesthesia, and 3 had undergone the AAA technique.1
For patients undergoing hypnosedation, preparation begins 1 month before surgery. Each patient is admitted to hospital for 1 day to undergo a complete neuropsychological assessment and functional magnetic resonance imaging (fMRI). While in hospital, the patients meet with the anesthesiologist, who is also the hypnotist, and discuss their hobbies and habits. The anesthesiologist also conducts a brief hypnosis session to introduce patients to the technique. As part of the introductory session, patients learn how to create an imaginary safe place where they could feel protected and secure during surgery.
Once in the operating room, the anesthesiologist places the patient in a hypnotic trance, enhancing the trance during the more unpleasant and painful stages of surgery with instructions and storytelling imagery. He uses objective trance symptoms, such as the eye-roll sign, to evaluate the effectiveness of the hypnosis, and utilizes his knowledge of the patient’s hobbies and habits to personalize the storytelling.
The technique did not work on all the patients. Six patients could not be induced into a hypnotic trance in the first few minutes, and their procedures were immediately and successfully converted to the AAA method.
Patients completed 4 questionnaires to evaluate their surgical experience: the Cohen Perceived Stress Scale and the Posttraumatic Stress Disorder Checklist Scale provided psychological assessment; the Peritraumatic Dissociative Experience Questionnaire and a questionnaire designed specifically for this study evaluated patients’ subjective hypnosis experience.1