The effects of a diet enriched with alpha-lactalbumin on mood and cortisol response in unmedicated recovered depressed subjects and controls

Alpha-lactalbumin is a tryptophan-rich protein fraction. A diet enriched with alpha-lactalbumin increases the ratio of tryptophan to the other large neutral amino acids, which may in turn increase brain serotonin content. In stress-vulnerable individuals, alpha-lactalbumin improved mood and attenuated the cortisol response after experimental stress. The aim of the present study was to investigate the effects of an alpha-lactalbumin-enriched diet on mood and stress response in recovered depressed subjects and healthy controls. Forty-three subjects (twenty-three recovered depressed and twenty healthy subjects) received alpha-lactalbumin and casein (placebo) on separate days, in a double-blind randomised crossover design. On both occasions, subjects underwent a stress test (an unsolvable mental arithmetic task with loud noise). The stress test affected mood in both conditions. Although the alpha-lactalbumin diet led to the expected rises in tryptophan and tryptophan:large neutral amino acids ratio, only minimal effects were found on mood and cortisol response to experimental stress. The results were the same for recovered depressed patients and controls. A 1 d diet enriched with alpha-lactalbumin is not sufficient to prevent a stress-induced mood deterioration or a cortisol response in unmedicated, recovered depressed subjects. Future studies may investigate the effects of longer-term diets or may investigate different samples (e.g. medicated patients).     

Effects of PhD examination stress on allopregnanolone and cortisol plasma levels and peripheral benzodiazepine receptor density

Peripheral benzodiazepine receptor (PBR) density in blood platelets and plasma allopregnanolone concentration in humans were determined following acute stress as represented by PhD examination. Fifteen healthy PhD students participated. Heart rate, blood pressure, plasma allopregnanolone, plasma cortisol, and PBR density were measured at different time points.

Allopregnanolone and cortisol concentration and PBR density were significantly increased during examination. A positive correlation between allopregnanolone and PBR density was found.     

Dispositional optimism and all-cause and cardiovascular mortality in a prospective cohort of elderly dutch men and women

BACKGROUND: Major depression is known to be related to higher cardiovascular mortality. However, epidemiological data regarding dispositional optimism in relation to mortality are scanty. OBJECTIVE: To test whether subjects who are optimistic live longer than those who are pessimistic. DESIGN: Our analysis formed part of a prospective population-based cohort study in the Netherlands (Arnhem Elderly Study). SETTING: General community. PARTICIPANTS: Elderly subjects aged 65 to 85 years (999 men and women) completed the 30-item validated Dutch Scale of Subjective Well-being for Older Persons, with 5 subscales: health, self-respect, morale, optimism, and contacts. A total of 941 subjects (466 men and 475 women) had complete dispositional optimism data, and these subjects were divided into quartiles. MAIN OUTCOME MEASURE: Number of deaths during the follow-up period. RESULTS: During the follow-up period of 9.1 years (1991-2001), there were 397 deaths. Compared with subjects with a high level of pessimism, those reporting a high level of optimism had an age- and sex-adjusted hazard ratio of 0.55 (95% confidence interval, 0.42-0.74; upper vs lower quartile) for all-cause mortality. For cardiovascular mortality, the hazard ratio was 0.23 (95% confidence interval, 0.10-0.55) when adjusted for age, sex, chronic disease, education, smoking, alcohol consumption, history of cardiovascular disease or hypertension, body mass index, and total cholesterol level. Protective trend relationships were observed between the level of optimism and all-cause and cardiovascular mortality (P<.001 and P = .001 for trend, respectively). Interaction with sex (P = .04) supported a stronger protective effect of optimism in men than women for all-cause mortality but not for cardiovascular mortality. CONCLUSIONS: Our results provide support for a graded and independent protective relationship between dispositional optimism and all-cause mortality in old age. Prevention of cardiovascular mortality accounted for much of the effect.     

Cross-validation,predictive validity,and time course of the Benzodiazepine Dependence Self-Report Questionnaire in a benzodiazepine discontinuation trial

The Benzodiazepine Dependence Self-Report Questionnaire (Bendep-SRQ) measures the severity of benzodiazepine (BZ) dependence on four domains: awareness of problematic use, preoccupation with the availability of BZ, lack of compliance with the therapeutic regimen, and withdrawal. Although promising results of the Bendep-SRQ have been obtained in cross-sectional studies, no attention has been paid to its clinical relevance during BZ withdrawal, i.e., predictive validity and time course. We performed cross-validation and evaluated the predictive validity and time course on 180 long-term BZ users who were taking part in a general practice BZ discontinuation trial. Three of the four domains had good scalability. Some concerns arose about the preoccupation scale, which emphasizes the need for cross-validation in clinically relevant populations. All scales showed excellent reliability (subject discriminability, item discriminability), while construct and discriminant validity were adequate. All four scales contributed significantly to the prediction of whether complete abstinence would be achieved directly after taking part in the discontinuation program. This prediction was independent of the other prognostic variables, except for those in the domain problematic use. The scales problematic use and preoccupation showed good sensitivity to changes during follow-up. The insensitivity of the scale, lack of compliance can be explained by low baseline scores in our population, while the insensitivity of the withdrawal scale was probably the result of the study design. In conclusion, our study indicated the clinical relevance of the Bendep-SRQ before and during a BZ discontinuation trial. We recommend the use of the Bendep-SRQ in discontinuation therapy and research into the field of BZ addiction.     

Penile malignant melanoma in association with squamous cell carcinoma of the penis

We report a case of malignant melanoma of the penis in association with penile squamous cell cancer. Previous regional lymphadenectomy did not prevent subsequent development of regional recurrence. This clinical presentation and the literature are discussed.     

Latent trait standardization of the benzodiazepine dependence self-report questionnaire using the Rasch scaling model

The aim of the present study was to obtain standardized scores that correspond with the raw scores on the four Rasch scales of the Benzodiazepine Dependence-Self Report Questionnaire (Bendep-SRQ). The eligible normative group for standardization of the Bendep-SRQ scales consisted of 217 general practice (GP) patients, all using benzodiazepines. Two standardization methods were used and compared: "classical standardization," which transforms raw scores into standard scores on the unit normal distribution, and "latent trait standardization," which transforms raw scores into latent trait scores. The latter requires the Rasch model with the additional assumption of a normally distributed latent trait, which held true for the scales "problematic use," "lack of compliance," and "withdrawal," but not for "preoccupation." The observed unequal item spacing on the "preoccupation" scale was hypothesized to induce a response tendency of nondeviation, causing a local violation of the assumption of a normally distributed latent trait. Nevertheless, comparison of the results of the two standardization methods revealed such a high degree of resemblance, that latent trait standardization could be used for "preoccupation" just as well as classical standardization. The presented standard scores and corresponding percentile ranks make raw Bendep-SRQ scores clinically interpretable in relation to the normative GP sample. Incorporation of the Rasch scaling methodology into the development of the Bendep-SRQ marks the adoption of the item response theory in the field of applied test methodology. In this process, it appears that equal item spacing has to be taken into account to prevent local violations of the Rasch model with the additional assumption of a normally distributed latent trait.