Effects of hand catalepsy on subjective trance perception and relative parasympathetic tone in healthy volunteers during pleasant hypnotic session: a randomized controlled study.

This study was designed to evaluate the effects on hand catalepsy on parasympathetic tone assessed using Analgesia/Nociception Index (ANI) and on subjective rating of absorption, dissociation, and time perception among healthy volunteers. This was a randomized controlled trial including participants to a medical hypnosis congress in France. Ninety volunteers were randomized in two arms, all receiving a fifteen-minute positive hypnotic trance, with or without hand catalepsy. The relative parasympathetic tone assessed by ANI (Analgesia/Nociception Index), heart rate and respiratory rate were recorded at different times of the study protocol. The actual duration of the hypnotic session, calculated from eye closing to eye opening, was also recorded. At the end of the hypnotic trance, participants subjectively rated their level of absorption and dissociation on a 0-10 scale. They were also asked to estimate the duration of the hypnotic session from eye closing to eye opening. In total, ninety subjects were included in the study. One subject was excluded because of deviation in the protocol standard, leaving eighty-nine subjects for analysis. Subject characteristics were similar between groups. There was a statistically different increase in ANI and decrease in both heart rate and respiratory rate over time with no difference with or without hand catalepsy. There was no statistically significant difference in absorption and dissociation subjective scales between groups. The median [Q1-Q3] actual duration of hypnotic sessions was similar between the catalepsy and the control groups (9 [8-10] min vs. 8 [7-10] min, respectively). However, subjects in the catalepsy group estimated a longer duration of the hypnotic session (12 [10-15] min) than in the control group (10 [5-10] min) with a mean ± SD overestimation of 3 ± 4 min (p < 0.001). Parasympathetic comfort increased during the hypnotic trance with no difference between groups. However, adding hand catalepsy to a pleasant hypnotic trance did not appear to increase feelings of absorption or dissociation but created time distortion on the longer side that could be useful in some clinical settings. Nevertheless, further study is still needed to determine more precisely the physiological and psychological effects on hand catalepsy during the hypnotic trance.

[Training of healthcare professionals in clinical hypnosis: A qualitative study]. / Étude qualitative de l'expérience de la formation en hypnose clinique pour les professionnels de santé.

OBJECTIVE: Training in clinical hypnosis leads to important transformations in healthcare professionals, in their professional practices as well as in their personal lives. The objective of this study was to explore how health professionals experience the transformations that result from such a training. METHOD: Semi-structured interviews with health professionals from France and Europe were conducted. The qualitative method used was Interpretative Phenomenological Analysis. Purposive sampling required to include participants from different professions, experience and regions of origin. They had already completed training in clinical hypnosis at different teaching institutions. RESULTS: Ten participants were included. The analysis showed four meta-themes of experience. First, it revealed participants' motivations for training in clinical hypnosis as one's desire to improve one's practice, leading to extraordinary discoveries, at a particular timing in their life. Second, participants described that hypnosis sometimes set the ground for a relationship verging on the more "intimate", therefore requiring greater caution so as not to disrupt the patient/healthcare professional relationship. Third, some participants experienced unforeseen personal fulfilment, better self-regulation of emotions and improved quality of life as well as greater comfort at the workplace. Finally, this study shed light on two limitations of training in clinical hypnosis as it can sometimes generate stress for the participants and/or result in bring about potential harmful effects: one of the risks being that the trainer might cross some ethical lines. DISCUSSION: The level of personal change experienced by the participants is similar to some changes induced by personal psychotherapy. For several participants, issues of power and vulnerability in the relationship using hypnosis were associated with a feeling of instability during the training. In hypnosis, the management of an asymmetrical relationship involves a two-way risk: vulnerability of the hypnotized person to the all-powerful relationship of their therapist as well as destabilization of therapists by the reduction of power asymmetry during hypnotic work with their patients.