Psychic euosmia and obsessive compulsive personality disorder

Patients with obsessive compulsive personality disorder(OCPD) often refer to a prompt mood improvement upon encountering good scents in general, or fresh laundry borax on their clothes, pillows or home settings. The Authors propose the new term psychic euosmia in the mean of an overstated psychological predisposition for a real pleasant smell that elicits an immediate sense of pleasure, order and calm. The prompt reactions to a pleasant odor might be explained by the involvement of rhinencephalon and its proximity to mood-related limbic circuits, which bypass the cognitive awareness. Cleanliness may not preclude a subject to enjoy a good smell, even if we are representing smells that resemble freshness, in other words order. A potentially even more important argument is given by the continuum of personality disorders and their variability. Not all personality characteristics led to disturbed behaviors. In evolutionary perspectives having the ability to differentiate between unpleasant and pleasant odors should have made the difference in surviving. On the other hand, psychic euosmia could be considered a normal reaction, but in our clinical experience it is over-represented among OCPD subjects with marked orderliness and disgust. Therefore, detecting psychic euosmia might vicariously confirm the relevance of disgust as a cognitive driver of OCPD. Hereby we support research to characterize psychic euosmia as a feature of orderliness and cleanliness for OCPD.

Psychic euosmia among obsessive-compulsive personality disorder patients:A case control study

BACKGROUND Psychic euosmia(PE)has been described as a supposed psychological predisposition for which pleasant smells elicit an immediate sense of pleasure,order and calmness in obsessive-compulsive personality disorder(OCPD).In this study we tried to verify the interpretation that PE is the counterpart of disgust that has been associated to contamination and moral purity.Disgust and morality are significantly associated in people with obsessive-compulsive personality traits.We expected that OCPD patients would experience higher levels of PE.AIM To investigate the PE frequency in OCPD patients and healthy controls(HC)and to evaluate the relationship between PE and disgust.METHODS A single-center,case-control study was conducted in an outpatient service for obsessive-compulsive and related disorders.The sample consisted of 129 subjects:45 OCPD patients and 84 HC.In both groups we submitted the Disgust Scale Revised(DS-R)and the self-report Structured Clinical Interview for DSM-5 Screening Personality Questionnaire to which we added an additional yes or no question to investigate the presence of PE.In order to verify differences between groups,t-test was employed for continuous variables and 2 test for categorical variable;odds ratio was employed to analyze group differences in the PE survey.Correlation was explored with Pearson r correlations.RESULTS No differences were observed between groups in gender composition or education.A slight significant difference was found in mean age(t=1.988;P=0.049).The present study revealed significantly higher proportions of PE among OCPD patients when compared to HC(OR:5.3,2.28-12.46).Patients with OCPD were more likely to report PE(n=36;80%)whereas a much lower proportion endorsed PE in the HC group(n=36;42.9%).Interestingly,no differences were observed between groups in mean score for the Disgust Scale.There was also no difference between the two groups in any of the Disgust Scale Revised subscales.Moreover,no significant correlations were observed in the OCPD group between PE and Disgust Scale Revised subscales.CONCLUSION Results suggested that PE might be part of the clinical spectrum of OCPD,and it does not reflect the counterpart of disgust.This could also indicate that this phenomenon is a manifestation of orderliness or incompleteness.Further studies will need to be undertaken to better understand PE and its significance in OCPD.

Antiglutamatergic agents for obsessive-compulsive disorder:Where are we now and what are possible future prospects?

Recent data suggest that obsessive-compulsive disorder(OCD)is driven by an imbalance among the habit learning system and the goal-directed system.The frontostriatal loop termed cortico-striatal-thalamo-cortical(CSTC)circuitry loop is involved in habits and their dysfunction plays an important role in OCD.Glutamatergic neurotransmission is the principal neurotransmitter implicated in the CSTC model of OCD.Hyperactivity in the CSTC loop implies a high level of glutamate in the cortical-striatal pathways as well as a dysregulation of GABA ergic transmission,and could represent the pathophysiology of OCD.Moreover,the dysregulation of glutamate levels can lead to neurotoxicity,acting as a neuronal excitotoxin.The hypothesis of a role of neurotoxicity in the pathophysiology of OCD clinically correlates to the importance of an early intervention for patients.Indeed,some studies have shown that a reduction of duration of untreated illness is related to an earlier onset of remission.Although robust data supporting a progression of such brain changes are not available so far,an early intervention could help interrupt damage from neurotoxicity.Moreover,agents targeting glutamate neurotransmission may represent promising therapeutical option in OCD patients.