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[Analyses of the risk factors for the progression of primary antiphospholipid syndrome to systemic lupus erythematosus]. ZHONGHUA NEI KE ZA ZHI 2024; 63:170-175. [PMID: 38326043 DOI: 10.3760/cma.j.cn112138-20231008-00189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Subscribe] [Scholar Register] [Indexed: 02/09/2024]
Abstract
Objectives: Analyze the clinical characteristics of patients with primary antiphospholipid syndrome (PAPS) progressing to systemic lupus erythematosus (SLE).Explore the risk factors for the progression from PAPS to SLE. Methods: The clinical data of 262 patients with PAPS enrolled in Peking Union Medical College Hospital from February 2005 to September 2021 were evaluated. Assessments included demographic data, clinical manifestations, laboratory tests (serum levels of complement, anti-nuclear antibodies, anti-double-stranded DNA antibodies), treatment, and outcomes. Kaplan-Meier analysis was used to calculate the prevalence of SLE in patients with PAPS. Univariate Cox regression analysis was employed to identify the risk factors for PAPS progressing to SLE. Results: Among 262 patients with PAPS, 249 had PAPS (PAPS group) and 13 progressed to SLE (5.0%) (PAPS-SLE group). Univariate Cox regression analysis indicated that cardiac valve disease (HR=6.360), positive anti-double-stranded DNA antibodies (HR=7.203), low level of complement C3 (HR=25.715), and low level of complement C4 (HR=10.466) were risk factors for the progression of PAPS to SLE, whereas arterial thrombotic events (HR=0.109) were protective factors (P<0.05 for all). Kaplan-Meier analysis showed that the prevalence of SLE in patients suffering from PAPS with a disease course>10 years was 9%-15%. Hydroxychloroquine treatment had no effect on the occurrence of SLE in patients with PAPS (HR=0.753, 95%CI 0.231-2.450, P=0.638). Patients with≥2 risk factors had a significantly higher prevalence of SLE compared with those with no or one risk factor (13-year cumulative prevalence of SLE 48.7% vs. 0 vs. 6.2%, P<0.001 for both). Conclusions: PAPS may progress to SLE in some patients. Early onset, cardiac-valve disease, positive anti-dsDNA antibody, and low levels of complement are risk factors for the progression of PAPS to SLE (especially in patients with≥2 risk factors). Whether application of hydroxychloroquine can delay this transition has yet to be demonstrated.
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Arousal and the pupil: why diazepam-induced sedation is not accompanied by miosis. Psychopharmacology (Berl) 2007; 195:41-59. [PMID: 17659380 DOI: 10.1007/s00213-007-0884-y] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/02/2007] [Accepted: 06/27/2007] [Indexed: 11/28/2022]
Abstract
RATIONALE There is a close relationship between arousal and pupil diameter, decrease in the level of arousal being accompanied by constriction of the pupil (miosis), probably reflecting the attenuation of sympathetic outflow as sedation sets in. Paradoxically, sedation induced by benzodiazepines is not accompanied by miosis. OBJECTIVE The objective of this study was to examine the hypothesis that diazepam may attenuate both the sympathetic and the opposing parasympathetic outflow to the iris, which may mask the miosis. Dapiprazole (sympatholytic) and tropicamide (parasympatholytic) were applied topically, together with the cold pressor test (CPT), to manipulate the sympathetic/parasympathetic balance. MATERIALS AND METHODS Sixteen healthy male volunteers participated in four weekly sessions according to a balanced double-blind protocol. Diazepam 10 mg (two sessions) and placebo (two sessions), associated with either 0.01% tropicamide or 0.5% dapiprazole eyedrops, were administered orally. Pupil diameter, light and darkness reflexes and pupillary sleepiness waves were recorded with infrared video pupillometry, alertness was measured by critical flicker fusion frequency (CFFF) and visual analogue scales (VAS), blood pressure and heart rate by conventional methods. CPT was applied after post-treatment testing. Data were analysed by analysis of variance, with multiple comparisons. RESULTS Diazepam caused sedation (reduction in VAS alertness scores and CFFF, increase in sleepiness waves), dapiprazole had a sympatholytic and tropicamide a parasympatholytic effect on the pupil. Diazepam had no effect on pupil diameter and reflexes or their modifications by the antagonists. CPT increased pupil diameter, blood pressure and heart rate, and the increase only in systolic blood pressure was attenuated by diazepam. CONCLUSIONS Diazepam-induced sedation is not accompanied by any change in either the sympathetic or parasympathetic influence on the iris.
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Modulation of the acoustic startle response by the level of arousal: comparison of clonidine and modafinil in healthy volunteers. Neuropsychopharmacology 2007; 32:2405-21. [PMID: 17342169 DOI: 10.1038/sj.npp.1301363] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
A sudden loud sound evokes an electromyographic (EMG) response from the orbicularis oculi muscle in humans together with an auditory evoked potential (AEP) and an increase in skin conductance (SC). Startle responses are inhibited by weak prepulses (prepulse inhibition, (PPI)) and may also be modified by the level of alertness. We compared the sedative drug clonidine and the alerting drug modafinil on sound-evoked EMG, AEP, and SC responses, on the PPI of these responses and on level of arousal and autonomic functions. Sixteen healthy male volunteers participated in four weekly sessions (clonidine 0.2 mg, modafinil 400 mg, their combination, placebo) in a double-blind, cross-over, balanced design. Responses were evoked by sound pulses of 115 and 85 dB (PPI) for 40 ms and recorded conventionally. Level of alertness, autonomic functions (pupil diameter, blood pressure, heart rate, salivation, temperature) and the plasma levels of the hormones prolactin, thyroid-stimulating hormone and growth hormone were also measured. Data were analyzed with analysis of variance with multiple comparisons. Both prepulses and clonidine attenuated all three startle responses and modafinil antagonized clonidine's effects on the EMG and AEP responses. None of the drugs affected PPI. Clonidine showed sedative and sympatholytic effects, and modafinil showed alerting and sympathomimetic effects. In conclusion, startle responses were susceptible not only to PPI but also to the level of arousal.
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Abstract
Arousal is regulated by the interplay between wakefulness- and sleep-promoting nuclei. Major wakefulness-promoting nuclei are the histaminergic tuberomamillary nucleus (TMN) of the hypothalamus and the noradrenergic locus coeruleus (LC) of the pons, which also play a role in autonomic regulation. First generation antihistamines, such as diphenhydramine, are likely to cause sedation by blocking excitatory H1 histamine receptors in the cerebral cortex, and the anti-narcolepsy drug modafinil may promote wakefulness by activating the locus coeruleus. We compared the effects of single doses of diphenhydramine (75 mg) and modafinil (200 mg) on arousal and autonomic functions in 16 healthy male volunteers, using a placebo-controlled, balanced, double-blind design. Arousal was assessed by critical flicker fusion frequency (CFFF), visual analogue scales (VAS) and pupillary fatigue waves (Pupillographic Sleepiness Test (PST)). Autonomic functions measured included resting pupil diameter, light and darkness reflex responses, blood pressure, heart rate and salivation. Data were analysed with ANOVA, with multiple comparisons. Diphenhydramine had sedative effects as shown by reductions in CFFF, VAS alertness ratings and increases of the indices of pupillary fatigue. Modafinil had alerting effects as indicated by reductions in the measures of pupillary fatigue. Comparison of pre-post medication changes in pupil diameter showed a decrease after diphenhydramine and an increase after modafinil. Diphenhydramine reduced salivation, and modafinil increased systolic blood pressure. In conclusion, diphenhydramine and modafinil evoked opposite effects on arousal and sympathetic functions, which are likely to reflect their interaction with the central histaminergic and noradrenergic systems. Hyposalivation by diphenhydramine is likely to be due to its additional anticholinergic property.
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Comparison of pramipexole with and without domperidone co-administration on alertness, autonomic, and endocrine functions in healthy volunteers. Br J Clin Pharmacol 2007; 64:591-602. [PMID: 17578485 PMCID: PMC2203276 DOI: 10.1111/j.1365-2125.2007.02938.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
AIMS To investigate the effects of the D2-receptor agonist pramipexole with and without the co-administration of the peripherally acting D2-receptor antagonist domperidone on measures of alertness, autonomic and endocrine function. METHODS Sixteen male volunteers participated in four weekly sessions of pramipexole 0.5 mg, domperidone 40 mg, their combination, and placebo administered according to a balanced, double-blind design. Alertness (visual analogue scales (VAS), critical flicker fusion frequency, pupillographic sleepiness test), autonomic (pupil diameter, light and darkness reflexes, blood pressure, heart rate, salivation, temperature) and endocrine (prolactin, thyroid-stimulating hormone (TSH), growth hormone (GH)) functions were assessed. Data were analyzed with anova with multiple comparisons. RESULTS The pre-post treatment changes in VAS alertness were reduced by pramipexole with and without domperidone (mean difference from placebo (95% confidence interval), mm): pramipexole -15.75 (-23.38, -8.13), combination -11.84 (-20.77, -2.91). Treatment condition significantly affected pupil diameter measured in different ways (resting pupil diameter (F(3,45) = 8.39, P < 0.001), initial diameter of the light reflex response (F(3,42) = 3.78, P < 0.05), and light (F(3,45) = 5.21, P < 0.005) and dark (F(3,45) = 3.36, P < 0.05) diameters of the darkness reflex response). Pramipexole without domperidone consistently increased pupil diameter on all measures (P < 0.05), whereas with domperidone only the increase in resting and dark diameters reached significance. Pramipexole reduced light reflex amplitude and increased latency, whereas the combination affected latency only. Concentrations of prolactin and TSH were increased by domperidone. Pramipexole reduced prolactin and increased GH concentrations. CONCLUSIONS The attenuation of the central pupillary effects of pramipexole by domperidone indicates that domperidone had access to some central D2-receptors.
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Relationship between sedation and pupillary function: comparison of diazepam and diphenhydramine. Br J Clin Pharmacol 2007; 61:752-60. [PMID: 16722841 PMCID: PMC1885114 DOI: 10.1111/j.1365-2125.2006.02632.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
AIMS To examine the relationship between sedation and pupillary function by comparing the effects of diazepam and diphenhydramine on arousal and pupillary activity. METHODS Fifteen male volunteers participated in three weekly sessions in which they received (i) diazepam 10 mg, (ii) diphenhydramine 75 mg and (iii) placebo, according to a balanced, double-blind protocol. Pupil diameter was measured with infrared pupillometry under four luminance levels. Alertness was assessed by visual analogue scales (VAS) and by critical flicker fusion frequency (CFFF). Blood pressure, heart rate and skin conductance were recorded by conventional methods. Data were analysed with analysis of variance (anova) with multiple comparisons. RESULTS There were significant effects of ambient luminance (F3,42 = 305.7, P < 0.001) and treatment condition (F2,28 = 9.0, P < 0.01) on pupil diameter; diphenhydramine caused miosis at all luminance levels (P < 0.05). The light reflex response was not affected. Both active drugs reduced the pre-post treatment changes compared with placebo [mean difference from placebo (95% confidence interval)]: in CFFF (Hz), diazepam -0.73 (-1.63, 0.17), diphenhydramine -1.46 (-2.40, -0.52); and VAS alertness (mm), diazepam -11.49 (-19.19, -3.79), diphenhydramine -19.83 (-27.46, -12.20). There were significant effects of both session (F2,26 = 145.1, P < 0.001) and treatment (F2,26 = 5.5, P < 0.01) on skin conductance; skin conductance was reduced by both drugs (P < 0.05). CONCLUSIONS The miosis by diphenhydramine and the reduction in skin conductance by both drugs may indicate central sympatholytic effects. A lack of a sympatholytic effect of diazepam on the pupil may be due to the masking of the miosis by mydriasis resulting from the inhibition of the parasympathetic output to the iris.
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Diazepam-induced disruption of classically-conditioned fear-potentiation of late-latency auditory evoked potentials is prevented by flumazenil given before, but not after, CS/US pairing. J Psychopharmacol 2007; 21:93-101. [PMID: 16533870 DOI: 10.1177/0269881106063130] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Classical fear conditioning involves pairing a neutral conditional stimulus (CS) with an aversive unconditional stimulus (US). Subsequent presentation of the CS alone induces fear responses. Acquisition of conditioned fear is thought to involve learning of the CS/US association, followed by memory consolidation. Recently we reported that the N1/P2 auditory evoked potential was enhanced by fear conditioning in humans. Diazepam 10 mg, given before CS/US pairing, prevented subsequent expression of fear potentiation when the response was elicited, 1 week later, in the presence of the CS. In this experiment, we examined whether this effect of diazepam was caused by disruption of the formation of CS/US associations or by disruption of consolidation. The benzodiazepine antagonist flumazenil was used to block the effect of diazepam either during the association period or during subsequent consolidation. Forty-two male volunteers (18-35 years) participated in two sessions separated by 7 days. In Session One, they ingested diazepam 10 mg or placebo: 60 minutes later they received flumazenil 1 mg or saline intravenously (i.v.). Then they received 20 presentations of a light (CS), 50% of which terminated with electric shock (US). This was followed by a second infusion of flumazenil or saline. Subjects received placebo/saline/saline (Group 1), diazepam/saline/saline (Group 2), diazepam/flumazenil/saline (Group 3) and diazepam/saline/flumazenil (Group 4). In Session Two, the CS was presented without the US; 50% of CS presentations terminated with a sound pulse; an equal number of sound pulses were presented without the CS. Auditory evoked potentials were recorded at Cz. In Session Two, CS presentation enhanced the auditory N1/P2 potential in placebo-treated subjects (Group 1). This enhancement was prevented by diazepam (Group 2). Flumazenil reversed diazepam's effect on fear potentiation if it was administered before conditioning (Group 3), but not if it was administered afterwards (Group 4). The results confirm that diazepam prevents the acquisition of fear conditioning in humans, and suggest that it disrupts the formation of CS/US associations, rather than the consolidation of fear memory.
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Comparison of pramipexole and modafinil on arousal, autonomic, and endocrine functions in healthy volunteers. J Psychopharmacol 2006; 20:756-70. [PMID: 16401653 DOI: 10.1177/0269881106060770] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The noradrenergic locus coeruleus is a major wakefulness-promoting nucleus of the brain, which is also involved in the regulation of autonomic and endocrine functions. The activity of the locus coeruleus is believed to be tonically enhanced by a mesocoerulear dopaminergic pathway arising from the ventral tegmental area of the midbrain. Both modafinil, a wakefulness-promoting drug, and pramipexole, a D(2)/D(3)receptor agonist with sedative properties, may act on this pathway, with modafinil increasing and pramipexole decreasing locus coeruleus activity. The aim of this study was to compare the two drugs on alertness, autonomic and endocrine functions in healthy volunteers. Pramipexole (0.5mg), modafinil (200mg), and their combination were administered to 16 healthy males in a double-blind, placebo-controlled design. Methods included tests of alertness (pupillographic sleepiness test, critical flicker fusion frequency, visual analogue scales), autonomic functions (resting pupil diameter, light and darkness reflex responses, heart rate, blood pressure, salivation, core temperature), and endocrine functions (blood concentrations of prolactin, growth hormone, and thyroid stimulating hormone). Data were analysed by ANOVA. Pramipexole reduced alertness, caused pupil dilatation, increased heart rate, reduced prolactin and thyroid stimulating hormone, and increased growth hormone level. Modafinil caused small increases in blood pressure and core temperature, and reduced prolactin levels. The sedative effect of pramipexole and the autonomic effects of modafinil are consistent with altered activity in the mesocoerulear pathway; the pupil dilatation following pramipexole suggests reduced dopaminergic excitation of the Edinger-Westphal nucleus.
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Comparison of pramipexole and amisulpride on alertness, autonomic and endocrine functions in healthy volunteers. Psychopharmacology (Berl) 2006; 187:498-510. [PMID: 16802163 DOI: 10.1007/s00213-006-0443-y] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/27/2006] [Accepted: 05/15/2006] [Indexed: 10/24/2022]
Abstract
RATIONALE In a previous study in healthy volunteers, the anti-Parkinsonian drug pramipexole caused sedation and pupil dilatation, consistent with the stimulation of inhibitory D(2)/D(3) autoreceptors on the ventral tegmental area dopaminergic neurones. The sedation may be related to the removal of the dopaminergic excitation of the locus coeruleus (via the meso-coerulear pathway), whereas the pupil dilatation may be due to the removal of the dopaminergic excitation of the Edinger-Westphal nucleus (via a putative meso-pupillomotor pathway). OBJECTIVES We investigated the hypothesis that amisulpride, a D(2)/D(3) receptor antagonist, would have effects opposite to those of pramipexole on alertness, pupillary and endocrine functions. MATERIALS AND METHODS Pramipexole (0.5 mg), amisulpride (50 mg), and their combination were administered to 16 healthy males in a balanced, cross-over, double-blind design. Tests included measures of alertness (Pupillographic Sleepiness Test, critical flicker fusion frequency, visual analogue scales), pupillary functions (resting pupil diameter, light and darkness reflex responses), non-pupillary autonomic functions (heart rate, blood pressure, salivation, core temperature), and endocrine functions [blood concentrations of prolactin, growth hormone (GH) and thyroid stimulating hormone (TSH)]. Data were analysed by ANOVA. RESULTS Pramipexole reduced alertness and pupillary light reflex response amplitude, tended to reduce core temperature, reduced prolactin levels and increased GH levels. Amisulpride reduced pupil diameter, increased the amplitude of the light reflex response and prolactin and TSH levels. CONCLUSIONS The opposite effects of pramipexole and amisulpride on alertness, pupillary function and pituitary hormone levels are consistent with their interactions with inhibitory D(2)/D(3) receptors on VTA neurones and in the tuberoinfundibular system.
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Why patients with Alzheimer's disease may show increased sensitivity to tropicamide eye drops: role of locus coeruleus. Psychopharmacology (Berl) 2006; 184:95-106. [PMID: 16308726 DOI: 10.1007/s00213-005-0227-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/12/2005] [Accepted: 10/05/2005] [Indexed: 11/29/2022]
Abstract
RATIONALE Patients suffering from Alzheimer's disease (AD) may show increased sensitivity to tropicamide, a muscarinic cholinoceptor antagonist. AD is associated with a severe loss of noradrenergic neurones in the locus coeruleus (LC), which can be "switched off" experimentally by the alpha(2)-adrenoceptor agonist clonidine. The possibility arises that increased pupillary sensitivity to tropicamide in AD may be due to diminished LC activity. OBJECTIVE To examine the hypothesis that clonidine may potentiate tropicamide-evoked mydriasis. MATERIALS AND METHODS Sixteen healthy male volunteers participated in two experimental sessions (0.2 mg clonidine or placebo) conducted 1 week apart. In each session tropicamide (0.01% 10 microl x 2) was applied to the left eye and artificial tear (10 microl x 2) was applied to the right eye. Pupillary functions (resting pupil diameter and light and darkness reflexes), alertness and non-pupillary autonomic functions (blood pressure, heart rate, core temperature and salivary output) were measured. Data were analysed by ANOVA, with multiple comparisons. RESULTS Tropicamide increased resting pupil diameter, velocity and amplitude of the darkness reflex response, and decreased recovery time of the light reflex response. Clonidine affected all these pupillary measures in the opposite direction with the exception of the recovery time. The mydriatic response to tropicamide was potentiated by pre-treatment with clonidine. Clonidine reduced critical flicker fusion frequency, subjective alertness, blood pressure, salivation and temperature. CONCLUSIONS The potentiation of tropicamide-evoked pupil dilatation by clonidine may be due to the abolition of the increase in parasympathetically mediated pupil constriction due to reduced LC activity.
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Does modafinil activate the locus coeruleus in man? Comparison of modafinil and clonidine on arousal and autonomic functions in human volunteers. Psychopharmacology (Berl) 2005; 181:537-49. [PMID: 15983798 DOI: 10.1007/s00213-005-0013-8] [Citation(s) in RCA: 90] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2004] [Accepted: 03/31/2005] [Indexed: 11/29/2022]
Abstract
RATIONALE Modafinil is a wakefulness-promoting drug which is likely to activate some wakefulness-promoting and/or inhibit sleep-promoting neurones in the brain. The locus coeruleus (LC) is a wakefulness-promoting noradrenergic nucleus whose activity can be "switched off" by the alpha2-adrenoceptor agonist clonidine, leading to sedative and sympatholytic effects. OBJECTIVE The aim of the study is to compare the effects of single doses of modafinil and clonidine on arousal and autonomic functions in human volunteers. METHODS Sixteen healthy male volunteers participated in four experimental sessions (modafinil 200 mg; clonidine 0.2 mg; modafinil 200 mg + clonidine 0.2 mg; placebo) at weekly intervals, according to a balanced double-blind protocol. Arousal [pupillary "fatigue waves" (PFW), critical flicker fusion frequency, self-ratings of alertness] and autonomic functions (pupil diameter, pupillary light and darkness reflex responses, blood pressure, heart rate, salivation) were recorded. Data were analyzed with ANOVA, with multiple comparisons. RESULTS Clonidine reduced subjective alertness, pupil diameter, the initial velocity and amplitude of the darkness reflex response, systolic and diastolic blood pressure and salivation, prolonged the recovery time of the light reflex response and increased PFW. Modafinil reduced PFW, increased pupil diameter and the initial velocity of the darkness reflex response and tended to reduce the effect of clonidine on pupil diameter and PFW. Modafinil had no effect on non-pupillary autonomic functions. CONCLUSIONS Clonidine exerted sympatholytic and sedative effects, whereas modafinil had sympathomimetic and some alerting effects. Modafinil may activate noradrenergic neurones in the LC involved in arousal and pupillary control, without affecting extracoerulear noradrenergic neurones involved in cardiovascular and salivary regulation.
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The histaminergic system of the brain: its roles in arousal and autonomic regulation. NEUROPSYCHOPHARMACOLOGIA HUNGARICA : A MAGYAR PSZICHOFARMAKOLOGIAI EGYESULET LAPJA = OFFICIAL JOURNAL OF THE HUNGARIAN ASSOCIATION OF PSYCHOPHARMACOLOGY 2004; 6:163-4. [PMID: 15816307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/02/2023]
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