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Biomedical subjects

J Rybakowski

Publications and source records attributed to J Rybakowski.

At least 19 recordsLinked to original sources
PubMed1992

Seasonal variations of the dexamethasone suppression test in depression compared with schizophrenia: a gender effect.

The circannual results of the dexamethasone suppression test (DST) were compared in depressed and schizophrenic patients for the periods November-February and March-October. During the winter months, female depressive and schizophrenic patients had lower rates of DST nonsuppression as well as lower concentrations of post-dexamethasone plasma cortisol, compared to the March-October period, despite similar pre-dexamethasone cortisol levels. Male depressed patients had lower pre-dexamethasone cortisol levels during the winter months while male schizophrenics had higher pre- and post-dexamethasone cortisol levels and higher rates of DST nonsuppression. This may suggest less disturbance of HPA axis function in winter months in depressed patients, mostly females, and confirms findings from some previous studies. A gender effect of DST seasonality was also demonstrated, with male schizophrenic patients presenting a reverse DST nonsuppression pattern compared with female depressive and female schizophrenic patients.

Adult↗
PubMed1992

Adding lithium to antidepressant therapy: factors related to therapeutic potentiation.

Lithium augmentation of antidepressant drugs was studied in 51 patients with endogenous refractory depression. The remission after 28 days of lithium was obtained in 28 patients (55%). Better effect of lithium was shown in bipolar than unipolar patients, with subjects with lower pre-lithium severity of depression and in those with rapid improvement (within 7 days) on lithium addition. Factors such as age, gender, number of prior antidepressant (or ECT) treatments, type of preceding antidepressant, mean plasma lithium concentration and the results of DST did not show any association with the outcome of lithium augmentation. The 'priming' effect of lithium may contribute to the mechanism of lithium potentiation in a proportion of depressed patients.

Adult↗
PubMed1992

The antidepressant effect of carbamazepine in callosal agenesis: a case report.

A dramatic resolution of severe depressive symptoms following carbamazepine administration in a patient with callosal agenesis is reported. Maintenance treatment with carbamazepine resulted in the alleviation of concomitant organic symptoms and in a marked improvement in quality of vital functions.

Agenesis of Corpus Callosum↗
PubMed1991

Clinical and biochemical heterogeneity of alcoholism: the role of family history and alexithymia.

Of 100 male patients with alcohol dependence, clinical and biochemical data were analysed in relation to family history of alcoholism and alexithymic personality traits. Family history was found in 38 patients and alexithymic personality traits in 79. No relationship was established between these two factors. In patients with a family history alcoholism began at a younger age with more severe clinical symptoms than in the remaining subjects. Patients with alexithymia had lower intensity of psychopathology but higher frequency of concomitant hypertension. Patients with family history had higher leukocyte counts and lower alcohol-induced elevations of liver enzymes and plasma lipids. In patients with alexithymia, higher values of hemoglobin and hematocrit were found. The results suggest that two predisposing factors to alcohol dependence such as family history of alcoholism and alexithymic personality determine the different clinical and biochemical features of the disease.

Adult↗
PubMed1990

A possible antiviral action of lithium carbonate in herpes simplex virus infections.

There has been considerable interest in the possibility that some psychotropic medications may possess antiviral activity. Several clinical observations suggest that lithium may inhibit the reactivation of latent herpes simplex virus, thereby reducing the number of recurrent infections. We performed a retrospective study examining the putative antiviral activity of various psychotropic agents in 177 subjects receiving lithium prophylaxis and a comparison group of 59 subjects receiving other antidepressant drugs for affective illness. Chronic lithium administration resulted in a significant reduction in the mean rate of recurrent labial herpes infections when compared to the pretreatment period (p less than 0.001). In contrast, the mean rate of herpes infections was unchanged in patients taking other antidepressants (p = 0.53). Although the overall reduction in herpes infections was not significantly different between groups, the proportion of subjects reporting a reduction in infection rate was greater in the lithium group (71%) compared with those receiving other antidepressants (52%) (p = 0.07). These data compliment prior in vitro and clinical studies demonstrating a potential antiviral activity for lithium carbonate.

Adult↗
PubMed1988

High prevalence of alexithymia in male patients with alcohol dependence.

The personality trait of alexithymia was assessed in 100 male inpatients with alcohol dependence using the Schaling-Sifneos Personality Scale. The score indicative of alexithymia (below 50 points) was found in 78 patients, a prevalence which exceeds that found in psychosomatic subjects. Patients with alexithymia did not differ from non-alexithymics in regard to demographic factors and severity of alcohol dependence. They were younger and had a shorter duration of illness what may indicate that alexithymia is not a result of the dependence. Alcoholic patients with concomitant hypertension had greater alexithymic scores. It is hypothesized that psychological and biological features of alexithymic subjects may render them more vulnerable to alcohol and more prone to subsequent development of the dependence.

Adult↗
PubMed1986

Erythrocyte lithium transport during lithium treatment in patients with affective disorders.

Erythrocyte lithium transport mechanisms--lithium-sodium countertransport (LSC), lithium-potassium cotransport (LPC) and passive lithium efflux (PLE)--were measured in 46 patients with bipolar affective disorder on prophylactic lithium therapy and in 20 healthy control subjects. Maximal velocity of LSC measured at saturating intracellular lithium concentration was lower in the patients than in the controls; this may concur with previous reports on possible links between impaired activity of LSC and bipolar affective illness. When measured at therapeutic lithium concentration, LSC was 4 times lower and Km for LSC was 5 times higher in lithium-treated affective patients than in control subjects. The in vivo erythrocyte:plasma lithium ratio was inversely correlated with LSC in lithium-treated patients; higher ratios were found in females than in males. No differences were found between affective patients and control subjects in other erythrocyte lithium transport measurements. The values for lithium transport were not related to age, duration of lithium therapy, concomitant neuroleptic treatment, hypertension or obesity. Lower activity of LSC was found in patients with lithium-induced thyroid enlargement than in the other patients. The results obtained are discussed in the light of contemporary findings concerning erythrocyte lithium transport mechanisms in affective disorders and other conditions.

Adult↗
PubMed1978

Erythrocyte concentrations of the lithium ion: clinical correlates and mechanisms of action.

When lithium carbonate is administered to individuals, there is considerable intersubject variation in the extent of accumulation of Li+ by erythrocytes. The primary reason for this is differences in the activity of a Li+-Na+ counterflow system, which, under clinical conditions, removes Li+ from the cell. It appears that some bipolar patients accumulate more Li+ in their red cells than either unipolar depressives or normal controls. The precise clinical characteristics of the bipolar patients who accumulate relatively large amounts of erythrocyte Li+ need to be clarified in future research. Finally, the measurement of red cell concentrations of Li+, in addition to the usual plasma measurement, can be used as an indicator of patient compliance.

Biological Transport, Active↗
PubMed1977

Prediction of the lithium ratio in man by means of an in vitro test.

The movement of the lithium ion (Li+) across the membrane of intact erythrocytes incubated in vitro was assessed under two different experimental conditions in which such transfer occurred primarily due to the activity of a lithium-sodium countertransport system. The 13 subjects on whom the in vitro procedures were done subsequently received lithium carbonate for 14 to 56 days, and the extent of accumulation of Li+ by erythrocytes in vivo was measured. While both in vitro procedures yielded data that correlated with the extent of accumulation of Li+ by erythrocytes in vivo, a system measuring the efflux of Li+ from Li+-loaded cells produced a much higher correlation (0.976). The magnitude of this correlation suggests that this in vitro system can be used for further investigations into the relevance of the erythrocyte accumulation of Li+ to the pathogenesis and treatment of affective disorders.

Adult↗
PubMed1976

Lithium-magnesium relationship in red blood cells during lithium prophylaxis.

The authors investigated lithium and magnesium levels in serum and RBC in 30 patients with affective disorders during lithium prophylaxis. No differences in magnesium levels were found in relation to diagnosis (unipolar, bipolar), sex and age. Mean RBC lithium index was higher in females than in males, particularly in bipolar patients. Magnesium levels in erythrocytes showed a significant negative correlation with RBC lithium and RBC lithium index. Serum magnesium levels did not correlate of lithium concentrations. It was concluded that RBC magnesium may play a role in lithium penetration of RBC and this was discussed in relation to clinical and pathogenetic factors.

Adolescent↗