Validation of the Arabic version of the MADRS scale among Lebanese patients with depression

Association of Computer Vision Syndrome with Depression/Anxiety among Lebanese Young Adults: The Mediating Effect of Stress

Computers have become indispensable in daily activities. With this excess use of electronics, computer vision syndrome (CVS), a highly prevalent condition, is associated with various symptoms. Although understanding the relationship between CVS and mental health has been reported, the impact of CVS has not been explored on more than one psychological aspect. We hypothesize that higher CVS symptoms could be associated with higher levels of anxiety and depression, mediated by higher stress. Therefore, the objective of this study was to determine the association between CVS and depression and anxiety among a sample of Lebanese young adults, along with evaluating the mediating effect of stress on these associations. Between August 2020 and April 2021, 749 participants completed an online questionnaire for this cross-sectional study. Females compared to males (Beta = 3.73) and those with CVS compared to those who did not (Beta = 3.14) were significantly associated with more anxiety, whereas having a university level of education compared to secondary or less (Beta = -3.02) was significantly associated with less anxiety. Females compared to males (Beta = 2.55) and those with CVS compared to those without (Beta = 2.61) were significantly associated with more depression, whereas being of an older age (Beta = -0.18) was significantly associated with less depression. Stress partially mediated the association between CVS and anxiety and between CVS and depression. More CVS was significantly associated with more stress (Beta = 3.05). Higher stress was significantly associated with more anxiety (Beta = 0.70) and depression (Beta = 0.71), whereas more CVS was significantly and directly associated with more anxiety (Beta = 3.14) and depression (Beta = 2.61). This study is the first worldwide to evaluate an association between CVS and mental health. Our results serve as a starting point for healthcare providers (psychiatrists and psychologists, most importantly) to look deeper into CVS when looking for reasons behind mental health issues. Further studies are warranted to confirm our results and look for more factors and mediators in such associations.

Correlates of severity in a clinical staging model of schizophrenia: a cross-sectional study among 158 subjects

BACKGROUND

Clinical staging has been widely used to predict and optimize the treatment of medical disorders. Different models have been proposed to map the development, progression, and extension of psychiatric disorders over time, mainly for schizophrenia. The primary objective of this study was to classify patients with psychosis according to the McGorry staging model and compare factors between the different stages.

METHODS

This was a cross-sectional study, collecting data from 158 patients hospitalized for schizophrenia/psychosis. The survey included the Mini International Neuropsychiatric Interview (MINI), Positive and Negative Symptom Scale (PANSS), Montgomery-Asberg Depression Rating Scale (MADRS), Yong Mania Rating Scale (YMRS), Clinical Global Impression (CGI) scale, and the McGorry staging model.

RESULTS

Patients have been classified into three clinical stages: relapse of psychotic disorder (43%), multiple relapses (47.5%), and persistent and severe illness (9.5%). A higher mean duration of hospitalization, psychotic symptoms (PANSS total scale and subscales), chlorpromazine equivalent dose, and number of antipsychotic treatments were found among participants in Stage 4 as compared to the other groups. However, a significantly higher mean GAF scale was found among participants in stage 3b as compared to the other groups.

CONCLUSION

Each stage in the McGorry staging model of schizophrenia is associated with well-defined clinical presentations, which help decide the appropriate treatment. Using such models in psychiatry can improve the diagnostic process and potential therapeutic interventions for patients suffering from mental disorders.

A factor analytic comparison of three commonly used depression scales (HAMD, MADRS, BDI) in a large sample of depressed inpatients

BACKGROUND

Quantifying depression mainly relies on the use of depression scales, and understanding their factor structure is crucial for evaluating their validity.

METHODS

This post-hoc analysis utilized prospectively collected data from a naturalistic study of 1014 inpatients with major depression. Confirmatory and exploratory factor analyses were performed to test the psychometric abilities of the Hamilton Depression Rating Scale, the Montgomery Asberg Depression Rating Scale, and the self-rated Beck Depression Inventory. A combined factor analysis was also conducted including all items of all scales.

RESULTS

All three scales showed good to very good internal consistency. The HAMD-17 had four factors: an "anxiety" factor, a "depression" factor, an "insomnia" factor, and a "somatic" factor. The MADRS also had four factors: a "sadness" factor, a neurovegetative factor, a "detachment" factor and a "negative thoughts" factor, while the BDI had three factors: a "negative attitude towards self" factor, a "performance impairment" factor, and a "somatic" factor. The combined factor analysis suggested that self-ratings might reflect a distinct illness dimension within major depression.

CONCLUSIONS

The factors obtained in this study are comparable to those found in previous research. Self and clinician ratings are complementary and not redundant, highlighting the importance of using multiple measures to quantify depression.

The association between mental health and Bulimia Nervosa among a sample of Lebanese young adults: the indirect effect of difficulties in emotion regulation

BACKGROUND

Bulimia nervosa (BN) is defined as repeated episodes of binge eating, followed by compensatory behaviors such as self-induced vomiting. BN has been shown to be associated with many co-morbidities including depression and anxiety. BN has also been associated with stress, which was shown to trigger binge eating episodes in BN. Furthermore, difficulties in emotion regulation have been seen to play an important role in the psychopathology of eating disorders, including BN. Seeing that BN is the most prevalent eating disorder in Lebanon, which is linked to the stressful events the country has been through, the study aims to examine the indirect effect of emotional dysregulation on this relationship between mental health issues (stress, anxiety and depression) and bulimia nervosa among young adults. We hypothesize that difficulties in emotion regulation would have an indirect effect in the relationship between mental health and BN.

METHODS

This was a cross-sectional observational study, based on an online anonymous survey, which was carried out between September and December of 2020. Participants were all 18 years and above, recruited from all Lebanese governorates (n = 1175).

RESULTS

Difficulties in emotion regulation mediated the association between anxiety/stress/depression and bulimia. Higher mental health issues were significantly associated with more difficulties in emotion regulation; higher difficulties in emotion regulation were significantly associated with more bulimia. Finally, higher anxiety and higher stress, but not depression, were significantly and directly associated with higher bulimia.

CONCLUSION

Results of this study could be used by mental health professional to shed light on the difficulties in emotion regulation in patients with BN and try to use therapeutic strategies to help them better regulate their emotions.

Predicting treatment outcomes of the Empowerment group intervention for refugees with affective disorders: Findings from the MEHIRA project

BACKGROUND

Research on outcome predictors in the field of transcultural treatment for refugees and asylum seekers (RAS) is scarce. We aimed to evaluate predictors of outcome of a group intervention (Empowerment) for RAS with affective disorders which was incorporated at level three of the stratified stepped-care model within the Mental Health in Refugees and Asylum Seekers (MEHIRA) project.

METHODS

A predictor analysis was performed at level three of the MEHIRA project, where 149 refugees with moderate depressive symptoms were treated either with Empowerment or Treatment-as-usual (TAU). Outcome measures were depression severity as assessed by patient-rated Patient Health Questionnaire 9 (PHQ-9) and clinician-rated Montgomery Asberg Depression Rating Scale (MADRS). Regression models with change scores (T1-T0) of PHQ-9 and MADRS as dependent variables were fit. Predictor selection was a mixed-method approach combining testing of literature-based hypotheses and explorative hypothesis-generating analyses of multiple baseline variables.

RESULTS

Intention-to-treat (ITT) analyses revealed significant linear relationships between change in PHQ-9 and baseline depression severity (β = -0.35, t = -3.27, p = .002) and perceived self-efficacy (β = -0.24, t = -2.26, p = .027) in the treatment (verum) condition. MADRS change scores were predicted by baseline depression severity (β = -0.71, t = -8.65, p < .001) in the treatment (verum) condition.

LIMITATIONS

Due to small cell numbers, single predictors could not be evaluated reliably.

CONCLUSIONS

Severity of depression and self-efficacy at baseline were predictors of symptom improvement at level three (Empowerment) of the MEHIRA project. Comorbidity and trauma indicators did not predict outcomes in the treatment (verum) condition, pointing towards broad applicability of the Empowerment intervention in refugee populations.

Validation and psychometric properties of the Arabic version of Hamilton Depression Rating Scale 7 items (HAMD-7) among non-clinical and clinical samples of Lebanese adults

BACKGROUND

The Hamilton Depression Rating Scale (HDRS or HAMD) is widely used scale for depression assessment. A shortened version of the HDRS, composed of 7 items, was implemented. The latter is timesaving compared to the original version, while still providing similar precision. Our objective in this study was to assess the psychometric properties of the Arabic HAMD-7 scale among non-clinical and clinical samples of Lebanese adults.

METHODS

In study 1, 443 Lebanese citizens enrolled in this cross-sectional study (June-September 2021). The total sample in study 1 was divided into two subsamples to conduct the exploratory-to-confirmatory factor analysis (EFA-to-CFA). Another cross-sectional study was conducted in September 2022 on another sample of Lebanese patients (independent from the sample of study 1) and included 150 patients attending two psychology clinics. The Montgomery-Asberg Depression Rating Scale (MADRS), Lebanese Depression Scale (LDS), Hamilton Anxiety Scale (HAM-A) and Lebanese Anxiety Scale (LAS) were used to assess the validity of the HAMD-7 scale.

RESULTS

The results of the EFA (subsample 1; study 1) showed that the HAM-D-7 items converged into a one-factor solution (McDonald's ω = .78). The CFA (subsample 2; study 1) confirmed the one-factor solution obtained in the EFA (ω = .79). CFA indicated that fit of the one-factor model of the HAM-D-7 was acceptable: χ2/df = 27.88/14 = 1.99, RMSEA = .066 (90% CI = .028, .102), SRMR = .043, CFI = .960, TLI = .939. All indices suggested that configural, metric, and scalar invariance was supported across gender. The HAMD-7 scale score positively correlated with the MADRS (r = 0.809; p<0.001), LDS (r = 0.872; p<0.001), HAM-A (r = 0.645; p<0.001) and LAS (r = 0.651; p<0.001) scales scores. The optimal cutoff score between healthy individuals and depressive patients for the HAMD-7 was at a value = 5.50 (Se = 82.8% and Sp = 62.4%). The positive and negative predicted values for the HAMD-7 were 25.1% and 96.0%, respectively. The positive and negative likelihood ratios were 2.20 and 0.28 respectively. No significant difference was found between the non-clinical total sample (study 1) and the clinical sample (study 2) in terms of HAM-D-7 scores (5.24 ± 4.43 vs 4.54 ± 5.06; t(589) = 1.609; p = .108).

CONCLUSION

Psychometric properties of the Arabic HAMD-7 scale are satisfactory, warranting its use clinically and in research. This scale seems highly efficient for ruling out depression; however, those with positive scores need a referral to a mental health professional for deeper evaluation. HAMD-7 might be self-administered by non-clinical subjects. Future studies are recommended to additionally confirm our results.

The association between fear of COVID-19 and depression, anxiety, and psychosis among Lebanese chronic patients with schizophrenia: any moderating effect of spirituality?

AIM

To assess whether fear of coronavirus disease 2019 (COVID-19) is associated with depression, anxiety, and psychosis and to evaluate if these variables are correlated with the interaction between spirituality and fear of COVID-19.

METHODS

Between September and November 2020, this cross-sectional study enrolled 118 chronic schizophrenia patients. The interview with patients included Fear of COVID-19 Scale, Lebanese Anxiety Scale-10, Montgomery-Asberg Depression Rating Scale, Positive and Negative Syndrome Scale (PANSS), and Functional Assessment of Chronic Illness Therapy-Spiritual Well-Being-12. The results were analyzed by using linear regressions (Enter method), with anxiety, depression, total PANSS score, positive PANSS, negative PANSS, and general psychopathology PANSS subscales as dependent variables. Spirituality, fear of COVID-19, and the interaction of spirituality with fear of COVID-19 were independents variables.

RESULTS

Fear of COVID-19 was positively correlated with increased total PANSS scores (Beta=0.90, P=0.030). Higher spirituality was significantly associated with lower anxiety (Beta=-0.14, P=0.009), lower depression (Beta=-0.21, P=0.001), lower total PANSS score (Beta=-0.90, P=0.004), lower negative PANSS score (Beta=-0.23, P=0.009), and lower general psychopathology PANSS score (Beta=-0.61, P=0.001). In patients with high fear of COVID-19, having low spirituality was significantly associated with higher anxiety, depression, and psychotic symptoms.

CONCLUSION

This study suggests a positive correlation between fear of COVID-19 and higher psychosis among inpatients with schizophrenia. The interaction of spirituality with fear of COVID-19 was correlated with reduced anxiety, depression, and psychosis.

Violence Against Women During COVID-19 Pandemic

The objectives of this study were to correlate several factors - including depression, anxiety, stress and self-esteem levels in both men and women - with the occurrence of domestic violence against women (VAW) during quarantine. This cross-sectional study was carried out in April 2020, in the midst of the COVID-19 pandemic when lockdown procedures were implemented; 86 married couples participated in this study amounting to 172 responses in total. A different questionnaire was set for women and men; the couple filled out their respective questionnaire simultaneously, but privately where one did not see the answers of the other. Inclusion criteria included married couples of all ages that are living together during the lockdown of COVID-19. The results of this study showed that a higher total abuse score was found in 39 females (45.3%; CI: 0.34 - 0.56). Being a Muslim female (Beta =24.80) and females having higher anxiety (Beta=0.97) were significantly associated with higher total abuse scores, whereas higher stress score in female (Beta=-0.61) was significantly associated with lower total abuse scores. In conclusion, this study focuses on VAW as a serious problem while demonstrating its further emergence during quarantine. This study also focused on the effects brought on by lockdown policies, including social and economic factors, and their implications in the increase of VAW during this pandemic.

Drunkorexia behaviors and motives, eating attitudes and mental health in Lebanese alcohol drinkers: a path analysis model

BACKGROUND

Drunkorexia refers to limited intake of high-calorie food to avert gaining weight and the need to increase in alcohol excessive consumption. The present study aimed to check for an association between depression, anxiety, and stress with drunkorexia behaviors/motives among Lebanese adults, while evaluating the mediating role of inappropriate eating attitude in those associations.

METHODS

Two hundred and fifty-eight participants enrolled in this cross-sectional study, who filled an online survey (September-December 2020).

RESULTS

Drunkorexia behaviors were considered as the dependent variable; the path coefficients from stress to anxiety, from anxiety to eating attitudes, from eating attitudes to drunkorexia behaviors and from anxiety to drunkorexia behaviors were all significant. The indirect relationships showed that eating attitudes mediated the association between anxiety and drunkorexia behaviors. When taking the drunkorexia motives as the dependent variable, the path coefficients from stress to anxiety, from anxiety to eating attitudes, from eating attitudes to drunkorexia motives, and from anxiety to drunkorexia motives were all significant. The indirect relationships showed that eating attitudes mediated the association between anxiety and drunkorexia motives.

CONCLUSION

This study highlighted that individuals with more psychological problems (depression, anxiety, and stress) and inappropriate eating habits exhibit more drunkorexic motivations and behaviors.

LEVEL OF EVIDENCE

Level V, Cross-sectional study.

Phubbing among Lebanese young adults: Scale validation and association with mental health (depression, anxiety, and stress)

Mobile phones use has not been without several social and psychological problems, specifically during the fast spread of the COVID-19 infection, which imposed strict restrictions and isolation. This research principal aims were to (1) confirm the validity of the Generic Scale of Phubbing in Arabic (GSP), and (2) evaluate the association between phubbing and mental health (depression, anxiety and stress). A first cross-sectional study enrolled 203 participants to confirm the factor structure of the phubbing scale among Lebanese young adults. A confirmatory factor analysis (CFA) was carried out on the whole sample using SPSS AMOS v.24 to confirm the four-factor structure of the GSP. The root mean square error of approximation (RMSEA) statistic, the comparative fit index (CFI) and the Tucker Lewis Index (TLI) were used to evaluate the goodness-of-fit of the model. RMSEA values ≤0.08 and ≤ 0.10 indicate a good and acceptable fit respectively. CFI and TLI values ≥0.90 indicate good model fit. A second cross-sectional study enrolled 461 respondents (18-29 years old) to conduct the multivariable analysis. The fit indices values were as follows: χ2/df = 181.74/84 = 2.16, TLI = .92, CFI = .94 and RMSEA = .076 [95% CI .061-.091] respectively, indicating an excellent fit of the model. The results of the multiple linear regression using the ENTER model, when taking the phubbing score as the dependent variable, showed that female gender (β = 0.11; t(454) = 2.50; p = .013), more stress (β = 0.27; t(454) = 3.94; p < .001), more anxiety (β = 0.30; t(454) = 4.24; p < .001), and older age (β = 0.28; t(454) = 6.12; p < .001) were positively correlated with higher phubbing, or higher household crowding index (β = -0.15; t(454) = -3.62; p < .001) was significantly correlated with less phubbing. The results of this study were able to confirm the validity of the Arabic version of the GSP scale. This will allow Lebanese clinicians to use this validated tool to screen for the presence of the phubbing phenomenon within this age group. We propose finding possible correlation between phubbing and others factors (such as obsession and loneliness) and validating this scale in other Arabic-speaking countries.

Affective temperaments of Lebanese patients with schizophrenia: comparison by gender and severity of psychosis

Objectives

Our aim in this study was to identify affective temperament differences utilizing the TEMPS-A in a large sample size of Lebanese patients with schizophrenia and compare them to healthy controls. Gender differences, demographic factors and degree of psychotic symptoms were also considered. A cross‐sectional study was conducted at the Psychiatric Hospital of the Cross (PHC) from March to June 2019. Two-hundred fifty chronic patients with schizophrenia were compared to 250 healthy controls randomly chosen from the general population.

Results

Patients with schizophrenia significantly had higher mean depressive, cyclothymic, irritable and anxious temperament scores compared to healthy controls. Healthy controls significantly had a higher mean hyperthymic temperament score compared to patients with schizophrenia. In the group of patients with schizophrenia exclusively, females scored higher in terms of depressive, cyclothymic and anxious temperaments compared to males. In the group of healthy controls, males scored higher in terms of hyperthymic and irritable temperaments compared to females, whereas a higher mean depressive and anxious temperament scores were significantly found in females compared to males. In addition, higher PANSS total scores, as well as higher positive, negative and general subscales scores were significantly associated with higher depressive, cyclothymic, irritable and anxious temperament scores.

Supplementary Information

The online version contains supplementary material available at 10.1186/s13104-021-05854-8.

Cyberchondria severity and quality of life among Lebanese adults: the mediating role of fear of COVID-19, depression, anxiety, stress and obsessive-compulsive behavior-a structural equation model approach

BACKGROUND

This study highlights the significant association between cyberchondria and quality of life among the Lebanese population in the time of COVID-19. The aim was to assess the association between cyberchondria and quality of life (QOL) of Lebanese community during the COVID-19 pandemic and assess the mediating effect of fear of COVID-19, depression, anxiety, stress and Yale-Brown Obsessive-Compulsive Scale in this association.

METHODS

This cross-sectional study was carried out between December 2020 and January 2021, during the COVID-19 pandemic. A total of 449 persons participated in this study by filling the online questionnaire. Structural equation modeling (SEM) was performed to examine the structural relationship between cyberchondria severity, the mediator (anxiety, stress, depression, obsessive-compulsive disorder (OCD) and fear of COVID-19) and physical/mental QOL.

RESULTS

Having a university level of education and older age were significantly associated with higher physical QOL scores, whereas higher obsession-compulsion disorder, higher stress and higher anxiety were significantly associated with lower physical QOL scores. Higher anxiety was significantly associated with lower mental QOL scores. The results of the SEM showed that stress, fear of COVID-19 and to a lesser limit OCD, mediated the association between cyberchondria severity and physical QOL, whereas anxiety, stress and fear of COVID-19 mediated the association between cyberchondria severity and mental QOL.

CONCLUSION

This research reported interesting results encouraging more exploration of cyberchondria and its association with quality of life during this unique period of the pandemic. However, this virus has altered the lives of individuals all across the world, and the consequences will last for a long time. Along with all of the steps done to stop the development of COVID-19 and improve physical outcomes, mental health requires immediate care. More research is needed to determine the coping techniques people are employing to deal with the pandemic.

Treatment satisfaction and its association with anxiety, depression and fear of COVID-19 among Lebanese inpatients with schizophrenia

Background:

The patient’s evaluation of treatment and its associated outcomes define the treatment satisfaction. The quality of treatment satisfaction and healthcare service has been affected by depression, anxiety and fear of the current coronavirus disease 2019 (COVID-19) pandemic.

Objective:

Therefore, this study aimed to assess factors associated with treatment satisfaction among Lebanese inpatients with schizophrenia, namely depression, anxiety and fear of COVID-19.

Methods:

A cross-sectional study was conducted between September and November 2020, enrolled 118 patients with chronic schizophrenia consecutively admitted to Psychiatric Hospital of the Cross, Lebanon. The Functional Assessment of Chronic Illness Therapy-Treatment Satisfaction-Patient Satisfaction Scale (FACIT-TS-PS) was used to assess treatment satisfaction, the Lebanese Anxiety Scale -10 (LAS-10) was used to assess anxiety, Montgomery-Asberg Depression Rating Scale (MADRS) to assess depression and the Fear of COVID-19 Scale to assess the level of fear of the COVID-19 pandemic.

Results:

The mean scores of the scales were as follows: treatment satisfaction (65.20; SD 16.11; median=71), LAS-10 (13.65; SD 6.02), MADRS (9.09; SD 6.69) and fear of COVID-19 (18.59; SD 6.78). Higher depression (r= -0.46, p<0.001) was significantly associated with lower treatment satisfaction. Female gender (beta=7.51, p=0.029) was significantly associated with higher treatment satisfaction score. Fear of COVID-19 did not show any significant association with the treatment satisfaction score.

Conclusions:

Results of this study found that depression and gender were associated with treatment satisfaction among inpatients with schizophrenia. No association has been found between fear of COVID-19 and treatment satisfaction among those patients. More research is warranted to evaluate treatment satisfaction and associated factors among chronic inpatients with schizophrenia, specifically during the COVID-19 pandemic, in order to improve treatment satisfaction and subjective well-being of patients.

Sleep disorders in a sample of Lebanese children: the role of parental mental health and child nutrition and activity

BACKGROUND

Sleep habits are an important component of a child's health and it is affected by parent-child relationship. Also, child's diet and nutrition appear to be an important factor affecting sleep health. Few studies have addressed the effect of parental emotional disturbance that can leave on children's sleep. Therefore, the objective of our study was to assess the prevalence of sleep disorders in pre- and school-aged children and evaluate its relation with parental mental health and child's nutrition and activity.

METHODS

A cross-sectional study, conducted between October 2020 and January 2021, which enrolled 402 Lebanese parents from all over Lebanon. The questionnaire was distributed online using the snowball technique. The Pediatric Sleep Questionnaire (PSQ) was used to assess pediatric sleep behaviors and the Family Nutrition and physical activity questionnaire was used to assess parental behaviors that might predispose children for obesity.

RESULTS

A total of 76 (19%) children had sleep disorders (PSQ scores of 8 or more). The multivariable analysis showed that higher paternal depression (Beta = 0.079, p = 0.010), maternal depression (Beta = 0.089, p = 0.001) and higher anxiety in the father (Beta = 0.064, p = 0.021) were significantly associated with higher PSQ scores (worse sleep) in the child. Higher Family Nutrition and Physical Activity Screening Tool scores in the child (Beta = -0.161, p < 0.001) was significantly associated with lower PSQ scores (better sleep).

CONCLUSION

Paternal anxiety and depression, as well as maternal depression, were factors associated with children's sleeping disorders. Future studies are needed to assess parental influence on child's development.

The Lebanese Depression Scale: A scale to screen for depression in the Lebanese population

OBJECTIVE

To create a Lebanese Depression Scale (LDS) and evaluate its performance on a group of Lebanese individuals.

METHODS

This cross-sectional analysis enrolled 997 residents (January-December 2018).

RESULTS

The elements in the Lebanese Depression Scale-19 items (LDS-19) scale converged over a combination of four factors (α_Cronbach  = .864). The correlation was positive between the LDS-19 and both the Hamilton Anxiety Scale score (r = .637; P < .001) and Lebanese Anxiety Scale score (r = .694; P < .001). According to the receiver-operating characteristics curve, the optimal score for the LDS-19 scale, which was a cutoff between healthy controls and depressive patients, was 18.50 (80.3% and 75.8%, respectively); the scale's positive predictive value was 31.0%, while the negative predictive value was 96.5%.

PRACTICE IMPLICATIONS

The LDS-19 is a useful tool to screen for depression in the Lebanese population, in both clinical and research settings.

Olfactory markers for depression: Differences between bipolar and unipolar patients

OBJECTIVES

The aim of the study was to compare olfactory functions between unipolar and bipolar patients according to the thymic states (depressed, euthymic) and determine specific olfactory variations between these different states.

METHODS

We recruited 176 participants in 5 groups: depressed bipolar (DB), euthymic bipolar (EB), depressed unipolar (DU), euthymic unipolar (EU), and controls (HC). They were assessed using the Sniffin' sticks threshold and identification tests. Odors' pleasantness, intensity, familiarity and emotion were assessed. Clinical evaluation explored dimensions of depression, mania, anxiety, and anhedonia.

RESULTS

Smell identification was lower in DU compared to EU patients and controls. Pleasant odors received lower hedonic rating in DU and DB patients compared to EU and EB patients respectively. Negative correlation was found in EB patients between hedonic rating and social anhedonia. In EU patients hedonic rating was negatively correlated with anxiety-state, and anhedonia.

CONCLUSIONS

Odor identification of pleasant odors is altered in both depressive states. Only unipolar patients would recover a regular identification level in symptomatic remission, while bipolar subjects would keep their deficits. Hedonic rating is lower in bipolar depressed patients compared to unipolar ones, and these deficits improve after remission. Hedonic rating of pleasant odors may distinguish bipolar depression from unipolar depression during periods of decompensation and phases of remission. Olfactory assessment may be useful to screen unipolar and bipolar depression, leading to possible future sensory markers in mood disorders.