LSD and ketanserin and their impact on the human autonomic nervous system
Psychophysiology – March 27, 2021
Source: OpenAlex
Summary
LSD significantly boosts sympathetic nervous system activity, while the serotonin 2A receptor antagonist ketanserin enhances parasympathetic tone. In a randomized, placebo-controlled crossover trial involving 30 participants, heart rate variability (HRV) measures revealed that increased sympathetic activity correlated positively with psychedelic effects of LSD, whereas higher parasympathetic activity showed a negative correlation. Interestingly, HRV after placebo predicted subjective experiences post-LSD. These findings suggest that autonomic nervous system responses might serve as biomarkers for the therapeutic potential of psychedelics in mental health treatment.
Abstract
Abstract The interest in lysergic acid diethylamide (LSD) has sparked again due to its supposed positive effects on psychopathological conditions. Yet, most research focuses on the actions of LSD on the central nervous system. The interaction with the autonomic nervous system (ANS) has been neglected so far. Therefore, the aim was to assess the effects of LSD and the serotonin 2A receptor antagonist ketanserin on the ANS as assessed by heart rate variability (HRV) measures and their correlation with subjective drug‐induced effects in a randomized, placebo‐controlled crossover trial. Thus, ANS activity was derived from electrocardiogram recordings after intake of placebo, LSD or ketanserin, and LSD by calculating R‐peak‐based measures of sympathetic and parasympathetic activity. Repeated measure ANOVA and partial correlation for HRV measures and subjective experience questionnaires were performed. LSD predominantly increased sympathetic activity, while ketanserin counteracted this effect on the ANS via an increase of parasympathetic tone. Sympathetic activity was positively and parasympathetic activity negatively associated with psychedelic effects of LSD. Furthermore, Placebo HRV measures predicted subjective experiences after LSD intake. The association between trait ANS activity and LSD‐induced subjective experiences may serve as a candidate biomarker set for the effectiveness of LSD in the treatment of psychopathological conditions.