Cannabinoid Receptors, Mental Pain and Suicidal Behavior: a Systematic Review.

PURPOSE OF REVIEW: The current serotonin-based biological model of suicidal behavior (SB) may be too simplistic. There is emerging evidence that other biomarkers and biological systems may be involved in SB pathophysiology. The literature on the endocannabinoid (EC) systems and SB is limited. The objective of the present article is to review all available information on the relationship between cannabinoid receptors (CB1 and CB2 receptors), and SB and/or psychological pain. RECENT FINDINGS: Our review is limited by the small number and heterogeneity of studies identified: (1) an autopsy study describing elevated levels of CB1 receptor activity in the prefrontal cortex and suicide in both depression and alcoholism and (2) studies supporting the involvement of both CB1 and CB2 receptors in the regulation of neuropathic pain and stress-induced analgesia. We conclude that cannabinoid receptors, particularly CB1 receptors, may become promising targets for the development of novel therapeutic tools for the treatment of SB.

Does the COVID-19 pandemic condition the delusional content of patients with psychosis? An observational study.

INTRODUCTION: The primary objective is to analyse the impact of the COVID-19 pandemic on the triggers of psychopathology and on the delusional content of patients with psychotic symptoms treated during the first three months of the pandemic in a tertiary hospital in Madrid. METHODS: We conducted a cross-sectional, observational and retrospective study of all patients attending the psychiatric emergency room (ER) between 11th March and 11th June 2020. Sociodemographic and clinical variables were included. The chi-squared test or Fisher's exact test were performed to compare categorical variables. The level of statistical significance was set at P<.05. RESULTS: In the first month of the pandemic, COVID-19 conditioned the delirious content of 38.5% of the admitted patients and acted as a direct trigger for 46.2% of consultations. In the second week it affected 100.0% of the patients in both cases. Subsequently, a progressive and significant decrease was observed, with COVID-19 being the triggering factor for 17.6% and 11.5% of consultations in the second and third months of the pandemic respectively. Similarly, it was the main determinant of the delusional content in 13.7% and 3.8% of cases respectively. CONCLUSIONS: The current pandemic affects delirium's pathoplasty. The delusional content of patients admitted with psychotic symptoms is quickly conditioned, which may be related to the radical change in their life, without transition or prior preparation. The patient's environmental context and events have a huge impact on the dynamics and characteristics of mental disorders.

[Does the COVID-19 pandemic condition the delusional content of patients with psychosis? An observational study]. / ¿La pandemia de COVID-19 condiciona el contenido delirante de los pacientes con psicosis? Un estudio observacional.

Introduction: The primary objective is to analyse the impact of the COVID-19 pandemic on the triggers of psychopathology and on the delusional content of patients with psychotic symptoms treated during the first three months of the pandemic in a tertiary hospital in Madrid.Methods: We conducted a cross-sectional, observational and retrospective study of all patients attending the psychiatric emergency room (ER) between 11th March and 11th June 2020. Sociodemographic and clinical variables were included. The chi-squared test or Fisher's exact test were performed to compare categorical variables. The level of statistical significance was set at p<0.05.Results: In the first month of the pandemic, COVID-19 conditioned the delirious content of 38.5% of the admitted patients and acted as a direct trigger for 46.2% of consultations. In the second week it affected 100.0% of the patients in both cases. Subsequently, a progressive and significant decrease was observed, with COVID-19 being the triggering factor for 17.6% and 11.5% of consultations in the second and third months of the pandemic respectively. Similarly, it was the main determinant of the delusional content in 13.7% and 3.8% of cases respectively.Conclusions: The current pandemic affects delirium's pathoplasty. The delusional content of patients admitted with psychotic symptoms is quickly conditioned, which may be related to the radical change in their life, without transition or prior preparation. The patient's environmental context and events have a huge impact on the dynamics and characteristics of mental disorders.

Serum endocannabinoid levels in suicide attempters: A pilot study.

The search for a biomarker for suicide risk is a longstanding pursuit in clinical psychiatry. Literature addressing the role of endocannabinoids in suicide attempters (SA) is sparse. This cross-sectional study is aimed at comparing 8 AM serum concentrations of 4 endogenous cannabinoids (anandamide, AEA; 2-arachidonoylglycerol, 2-AG; N-palmitoiletanolamida, PEA; and oleoylethanolamide, OEA) in 30 suicide attempters (SA) and 12 psychiatric controls (PC). 8 AM AEA and PEA serum levels were higher in SA compared to PC without controlling for cannabis use (n = 42) (3.58 ± 5.77 vs. 1.62 ± 2.49, F = 3.04, P = 0.089; and 3.31 ± 4.82 vs. 1.21 ± 1.20, F = 6.22, p = 0.017, respectively). Serum ACTH was higher in PC compared to SA (32.11 ± 21.60 vs. 20.05 ± 9.96, F = 9.031, p = 0.0.005). After controlling for cannabis use in the urine test (n = 28), 8 AM AEA and PEA serum levels remained higher in SA compared to PC (4.57 ± 6.38 vs. 0.64 ± 1.11, F = 4.852, P = 0.037; and 4.35 ± 5.46 vs. 1.21 ± 1.25, F = 4.125, p = 0.053, respectively). The present study offers preliminary evidence about the role of AEA and PEA in suicidal behavior (SB). Furthermore, in the context of the mental pain model of SB, our findings suggest that some endocannabinoids may play a role in the pathophysiology of SB. Our pilot study deserves replication by other studies with bigger sample sizes.

Serum ß-endorphin levels are associated with addiction to suicidal behavior: A pilot study.

The literature provides partial support for the hypothesis that some suicide attempters develop a behavioral addiction to suicidal behavior (SB). We hypothesized that major suicide repeaters (MR) (≥5 lifetime suicide attempts) are addicted to suicide attempts as measured by modified DSM-IV criteria for substance dependence. In this cross-sectional study with 13 psychiatric controls (PC), 55 non-major suicide attempters (NMR), and 9 MR we found that MR are characterized by emotional abuse and neglect, as well as higher scores on the Personality and Life Event scale (short version). The levels of 8 AM serum ACTH, cortisol and ß-endorphin were elevated in all three groups. Serum ß-endorphin (pg/mL) was particularly high in PC diagnosed with schizophrenia 220.34 (±56.30). The level of 8 AM serum ß-endorphin rose with increased numbers of criteria met for addiction to SB from 130.31 (±88.16) (≥ 3 criteria met for addiction to SB) to 174.84 (±114.93) (≥ 6 criteria met for addiction to SB) whereas serum ACTH and cortisol did not change. SB addicts (≥ 6 criteria) displayed higher serum ß-endorphin concentrations than non-addicts (174.84 ± 114.93 vs. 116.93 ± 61.70, FET p = 0.09). The present study brings some support to the addictive hypothesis of SB. Our results delineate ß-endorphin as a promising biomarker of SB addiction, and offer a good basis for future studies that test whether buprenorphine can be used to prevent repetitive suicide attempts, non-suicidal-self-injury (NSSI), and the development of an addiction to SB.

Análisis de la demanda asistencial en la urgencia y unidad de hospitalización psiquiátrica en el contexto de pandemia por COVID-19 / Analysis of the demand for care in a psychiatric emergency room and an acute inpatient unit in the context of the COVID-19 pandemic

INTRODUCCIÓN: El objetivo consiste en analizar el impacto del COVID-19 en la demanda asistencial de las urgencias y en los ingresos psiquiátricos durante el primer mes de la pandemia. MÉTODOS: Realizamos un estudio transversal observacional retrospectivo en pacientes que acuden a urgencias psiquiátricas entre el 11 de marzo y el 11 de abril de 2019 y 2020 respectivamente. Se incluyeron variables sociodemográficas y clínicas en el estudio. Se realizaron las pruebas de Chi Cuadrado o Test exacto de Fisher para el contraste de hipótesis de variables categóricas y la prueba U Mann-Whitney para el contraste de variables cuantitativas. El nivel de significación estadística se estableció en p<0.05. Los análisis se realizaron con IBM SPSS Statistics. RESULTADOS: Se observa un descenso significativo de la media de pacientes atendidos al día en urgencias entre ambos periodos, siendo esta de 5,91 (±2,53) en 2019 y de 2,41 (±1,81) en 2020 (p<0.001). Se ha visto una disminución significativa de la ocupación media de camas en la UHB, ocupándose un 91,84% (±7,72) de camas en 2019 y un 58,85% (±13,81) en 2020 (p<0,001). En cuanto a la proporción de ingresos de los pacientes que acuden a urgencias, se ha visto un aumento significativo en el año 2020 respecto al año anterior. CONCLUSIONES: La demanda en la urgencia de pacientes psiquiátricos y la ocupación media de camas se ha reducido durante el primer mes tras la declaración de la pandemia. El miedo al contagio puede actuar como modulador de la demanda psiquiátrica.

INTRODUCTION: The aim is to analyze the impact of COVID-19 on the demand for emergency care and psychiatric admissions during the first month of the pandemic. METHODS: We conducted a retrospective, observational and cross-sectional study. We reviewed the clinical records of all patients attending the psychiatric emergency room (ER) between March 11th and April 11th, of both 2019 and 2020. Sociodemographic and clinical variables were included in the study. Chi-square test or Fisher's exact test were performed to compare categorical variables, while U Mann-Whitney U test was used for quantitative variables. The level of statistical significance was set at p<0.05. Analysis were conducted using IBM SPSS Statistics. RESULTS: The was a significant decrease in the number of patients attended in the ER. An average of 5.91 (±2.53) patients were treated per day in 2019 compared to 2.41 (±1.81) in 2020 (p<0.001). There was also a significant decrease in the occupancy rate at the inpatient psychiatric unit, with a 91.84% (±7.72) of beds occupied in 2019 and only 58.85% (±13.81) in 2020 (p<0.001). Regarding the percentage of patients admitted after assessment in the ER, there was a significant increase in 2020 compared to the previous year. CONCLUSIONS: The demand for care in the psychiatric emergency room and the average bed occupancy have decreased during the first month after the declaration of the pandemic. Fear of contagion may act as a modulator of psychiatric demand.