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H J Wark

Publications and source records attributed to H J Wark.

11 recordsLinked to original sources
PubMed1997

Premorbid personality in patients with uni- and bipolar affective disorders and controls: assessment by the Biographical Personality Interview (BPI).

The relationship between premorbid personality and subtypes of affective disorder was investigated by means of the Biographical Personality Interview (BPI) and by a self-rating scale. Interviewer and rater (BPI) were blind to diagnosis. A total of 52 patients with unipolar depression or bipolar II disorder (D/Dm), 32 bipolar-I patients (DM) and 39 control subjects (C) were examined. Expert rating of "typus melancholicus" features (BPI) were found to be more pronounced in D/Dm than in DM and C. "Typus manicus" features were also distinguished between both clinical groups, whereas anxious-insecure features were not significantly different between the groups of patients. In contrast to the expert-rated personality variants, self-rating of personality features did not reveal any significant differences between the two clinical groups. Potential sources of the discrepancies between the questionnaire data and the interview data are discussed. It is concluded that premorbid features of "typus manicus" and "typus melancholicus" predicted, respectively, a predominant manic and a predominant depressive course of an affective disorder.

Adult↗
PubMed1996

Increased sensitivity of the inositol-phospholipid system in neutrophils from patients with acute major depressive episodes.

Evidence from in vitro and in vivo studies suggests that the therapeutic and prophylactic effects of lithium in recurrent affective disorders are due to an attenuation of the inositol-phospholipid (IPL) second messenger system. An increased sensitivity of this signal transduction system might therefore constitute a risk factor for affective illness. The extent of the agonist-induced release of intracellular Ca2+ (Ca2+ response) can be used as an indicator of the sensitivity of the IPL system. Using this paradigm, we have measured the agonist-induced Ca2+ response in neutrophils of 17 unmedicated patients who were experiencing an acute major depressive episode. The neutrophils were stimulated by the chemotactic peptide formylmethionylleucylphenylalanine, which activates the IPL system in the cells. The sensitivity of the IPL system in these patients was significantly greater (dose-response curve shifted to the left) compared with its sensitivity in healthy age- and sex-matched control subjects. The results indicate that acute episodes of major depression are associated with an increased sensitivity of the IPL system.

Adult↗
PubMed1993

Increased sensitivity to agonist stimulation of the Ca2+ response in neutrophils of manic-depressive patients: effect of lithium therapy.

The agonist-stimulated increase of intracellular free-Ca2+ concentration, an indicator of the sensitivity of the inositol phospholipid second-messenger generating system, was measured in neutrophils from patients with manic-depressive disorder, and controls. Dose-response curves of the calcium response were determined by measuring the fluorescence of neutrophils loaded with fura-2 and stimulated with various concentrations of the chemotactic tripeptide formylmethionylleucylphenylalanine. EC50 values were obtained for 14 medication-free patients (5 acutely depressive, and 9 symptom free remitted patients with a history of manic-depression or recurrent major depression), 9 lithium-treated, euthymic manic-depressive patients and 10 drug-free healthy controls. The EC50 values of the untreated patients were significantly lower than in the controls. Lithium-treated patients had EC50 values significantly higher than controls. These results suggest that manic-depressive disorder is associated with an increased sensitivity of the inositol phospholipid second-messenger generating system, which is counteracted by lithium treatment.

Adult↗
PubMed1991

Hypothalamic-pituitary-adrenal axis function in elderly endurance athletes.

To explore the effects of repeated episodes of hypercortisolemia on hypothalamic-pituitary-adrenal axis regulation, we studied plasma ACTH and cortisol (CORT) responses to 100 micrograms human CRH (hCRH) in 10 dexamethasone (1.5 mg)-pretreated elderly endurance athletes who had abstained from physical activity for at least 48 h before testing and 13 sedentary age-matched controls. Basal CORT and ACTH levels were indistinguishable between runners and sedentary controls, whereas CORT responses to hCRH were significantly increased in endurance athletes, and ACTH responses tended to be higher in this group. Comparing the dexamethasone/hCRH test results of the runners with those of an age-matched sample of previously studied depressed patients (n = 9), similar hormone responses to CRH challenge were noted. The mechanisms underlying these alterations may either be a stepwise decrease in corticotropic sensitivity to the negative feedback signal leading to a switch to positive glucocorticoid feedback, an enhanced cosecretion of ACTH secretagogues such as vasopressin, or a combination of both. In conclusion, hypothalamic-pituitary-adrenal axis physiology seems to be determined by previous stressful events associated with hypercortisolemia, regardless of its etiology.

Adrenocorticotropic Hormone↗
PubMed1983

The safety of atropine premedication in children with Down's syndrome.

Forty-five operative procedures were performed in 32 patients with Down's syndrome at the Royal Alexandra Hospital for Children, Sydney in a single year recently. Atropine premedication was administered to 25 patients with Down's syndrome on 38 occasions. Three dosage regimes of atropine were used: 20 micrograms/kg, 12 micrograms/kg, both intramuscularly, and 10 micrograms/kg intravenously. There was no statistically significant difference in the alteration of heart rate for the three dosage groups of atropine used when children with Down's syndrome were compared with weight-matched control children having similar operative procedures performed.

Adolescent↗
PubMed1983

Postoperative jaundice in children. The influence of halothane.

At the Hospital for Sick Children, Great Ormond Street, during the 23-year period 1957 to 1979, 165400 anaesthetics were administered. Almost all of the patients anaesthetised during this time would have been exposed to halothane. Seventy-four patients became jaundiced for the first time in the post-operative period. Halothane-associated hepatitis was excluded as the cause of the postoperative jaundice in all but two of the 74 patients. In these two patients in whom the diagnosis of halothane-associated hepatitis was possible the hepatitic illness was mild and both patients made an uneventful recovery. In this survey the risk of a patient becoming jaundiced due to halothane associated hepatitis was greater than 1 in 82000. It would seem that in children halothane can be used whenever it is warranted and can be used repeatedly.

Adolescent↗
PubMed1977

An unusual complication of an inadvertent dural tap.

The report describes a case of a large arteriovenous malformation of the brain becoming manifest following an inadvertent dural tap which was achieved while performing a lumbar epidural for the relief of labour pains.

Adult↗
PubMedDate not supplied

Cholinergic REM induction test: muscarinic supersensitivity underlies polysomnographic findings in both depression and schizophrenia.

Disinhibition of rapid eye movement (REM) sleep (e.g. shortening of REM latency, heightened REM density) is frequently encountered in patients with a major depressive disorder (MDD). Administration of cholinomimetics prior to or during sleep leads to a more pronounced advance of REM sleep in depressed patients compared to healthy controls and patients with other psychiatric disorders. The present study tested whether the cholinergic REM induction test (CRIT) with 1.5 mg RS 86 (an orally acting muscarinic agonist) differentiates patients with MDD (n = 40) from those with schizophrenia (n = 43) and healthy controls (n = 36). The most pronounced shortening of REM latency after cholinergic stimulation occurred in patients with MDD. However, a significant number of patients with schizophrenia also displayed short REM latencies (REM latency < 25 minutes) under placebo conditions and after cholinergic stimulation. REM density measures more clearly differentiated patients with MDD from those with schizophrenia. It is concluded that a subgroup of patients suffering from schizophrenia displays signs of a muscarinic receptor supersensitivity.

Adolescent↗