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  • Discriminable Properties of Drugs  (1)
  • Endothelin  (1)
  • Endothelium Tissue damage  (1)
  • 1
    ISSN: 1432-1238
    Keywords: Critical illness ; Hemodynamics ; Circulation ; Vasoactive substances ; Endothelin ; Catecholamines ; Atrial natriuretic peptide ; Outcome
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Objective Regulation of circulatory homeostasis is based on several factors including various circulating vasoactive substances. Whether these regulators differ between survivors and non-survivors was investigated in critically ill patients. Design Prospective study. Setting Clinical investigation on a surgical intensive care unit of an university hospital. Patients 60 consecutive patients suffering from trauma (n=21) or postoperative complications (n=39) were studied prospectively. The patients were divided into survivors (n=27) and non-survivors (n=33). Therapy was adjusted to the standards of modern intensive care management by physicians who were not involved in the study. Measurements and results Endothelin-1, atrial natriuretic peptide (ANP), vasopressin, renin, and catecholamine (epinephrine, norepinephrine) plasma levels were measured from arterial blood samples using radioimmunoassay (RIA) or high-pressure liquid chromatography (HPLC) technique on the day of admission to ICU and during the following 5 days. Various hemodynamic parameters were also monitored during that period. The non-survivors showed elevated pulmonary artery pressure (PAP: 34.1±5.4 mmHg) and pulmonary capillary wedge pressure (PCWP: 20.3±7.3 mmHg) already at the beginning of the study. Cardiac index (CI) did not differ among the groups, whereas right ventricular ejection fraction (RVEF) decreased in the non-survivors. PaO2/FIO2 decreased only in the non-survivors, whereas VO2 increased in the survivors (from 246±48 to 331±43 ml/min). Plasma levels of renin (from 206±40 to 595±81 pg/ml) and vasopressin (from 5.78±0.82 to 7.97±0.69 pg/ml) increased significantly in the non-survivors. Epinephrine and norepinephrine plasma concentrations were elevated in the non-survivors already at baseline and tremendously increased in these patients during the following days. ANP plasma levels significantly increased also only in the non-survivors (from 188±63 to 339±55 pg/ml) (p〈0.05). Endothelin-1 decreased in the survivors, whereas it significantly increased in the non-survivors (from 3.62±0.68 to 9.37±0.94 pg/ml) during the study period (p〈0.05). Analyses of co-variance revealed overall no significant correlation between circulating vasoactive substances and hemodynamics. Conclusions Systemic and regional regulators of the circulation were markedly changed by critical illness. In survivors, these regulators almost normalized within the study period of 5 days, whereas in non-survivors these alterations were even aggravated. It can only be speculated whether these regulator systems were influenced by activation of various mediator systems or whether they themselves influenced the negative outcome in the non-survivors.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-1238
    Keywords: Trauma-sepsis ; Inflammatory response ; Soluble adhesion molecules ; Endothelium Tissue damage ; Neutrophils
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Objective The time course of circulating adhesion molecules was monitored in traumatized and sepsis patients. Design Prospective, descriptive. Setting A surgical intensive care unit of a university hospital. Patients A total of 30 consecutive critically ill patients suffering either from trauma (n=15) or postoperative sepsis (n=15). Interventions All patients were on continuous analgo-sedation and mechanical ventilation. Measurements and results From arterial blood samples, plasma levels of soluble adhesion molecules [endothelial leukocyte adhesion molecules (sELAM-1), intercellular adhesion molecule-1 (sICAM-1)], and vascular cell adhesion molecule-1 (sVCAM-1) were measured on the day of admission (trauma patients) or on the day of diagnosis of sepsis (=baseline values), and during the following 5 days. In the trauma group,sELAM-1 (57.9±11.0 ng/ml) andsVCAM-1 (698±93 ng/ml) were within normal ranges at baseline, whereas they were markedly elevated in the sepsis group (sELAM-1: 340±95 ng/ml;sVCAM-1; 1,042±449 ng/ml). In the sepsis patients,sELAM-1 significantly decreased andsVCAM-1 increased, but remained almost unchanged in the trauma patients. Non-survivors showed markedly elevated plasma levels ofsELAM-1 andsVCAM-1.sICAM-1 was elevated in both groups at baseline and was higher in the sepsis group (1,266±261 ng/ml) than in the trauma group. In the septic patients,sICAM-1 increased further (2,022±609 ng/ml) and remained unchanged in the trauma group. All non-survivors showedsICAM-1 plasma levels of 〉800 ng/ml. Conclusion Endothelial damage may result in multiple-organ dysfunction syndrome. Adhesion molecules are considered to be a cornerstone in this process. Trauma patients showed lower plasma levels of circulating adhesion molecules than did sepsis patients indicating more pronounced (inflammatory related) endothelial activation or damage in sepsis. Therapeutic modulation of circulating adhesion molecules may be of benefit to the patients outcome and therefore warrants further study.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Psychopharmacology 43 (1975), S. 229-232 
    ISSN: 1432-2072
    Keywords: LSD ; Discriminable Properties of Drugs ; Serotonin Receptors ; Rats
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Rats were initially trained to discriminate LSD from saline in two-lever operant chambers by reinforcing responses only on one lever following intraperitoneal injections of 80 Μg/ kg of LSD and only on the other lever following saline injections. Choice responding during extinction periods (no water reinforcement for either response) indicated a high level of discriminability (95% correct) following either LSD or saline. A dose-response curve for LSD, obtained by tests for lever choice after injections of 10, 20, 30, 40, 50, and 60 Μg/kg, indicated that 10 Μg/kg produced only 30% responding on the LSD lever. This percentage was increased (to 83%) by reinforcing responding on the LSD lever following injections of 10 Μg/kg. Subsequent tests indicated that doses of 5.0 and 2.5 Μg/kg produced a majority of responses on the LSD lever. Since at these low doses LSD has few measurable biochemical or behavioral effects, we hypothesize that the discriminable cue of LSD is related to direct stimulation of central serotonergic receptors.
    Type of Medium: Electronic Resource
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