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1.
Int J Cardiol ; 152(1): 88-94, 2011 Oct 06.
Artigo em Inglês | MEDLINE | ID: mdl-21397348

RESUMO

BACKGROUND: Heart failure (HF) is a major health and social problem. Internal Medicine (IM) wards admit a high proportion of patients with HF, frequently with advanced age and comorbidities. Few recent data are available in this setting, especially on predictors of in-hospital outcome. METHODS: In this observational study, we recruited patients admitted with diagnosis of HF and present in five index days, in 91 units of IM in Italy. Characteristics and management of HF, comorbidities, functional and cognitive status, and quality of life, were analyzed. RESULTS: We observed 1411 patients, with a mean age of 78.7 ± 9.6 years. At admission, 81.7% of the patients were in NYHA classes III-IV. Ninety percent of the patients had at least one comorbidity. Dementia or severely impaired functional status were registered in 21.5% and 22.8% of the patients. In 89 patients (6,3%) a negative outcome (death or clinical worsening) occurred during hospitalization. A number of variables were significantly related to negative outcome by means of univariate analysis (systolic blood pressure <100 mm Hg, pulse pressure ≥ 55 mm Hg, anaemia, brain deficit, permanent bed rest, Barthel Index ≤ 30). At multivariable analysis, significant correlation was retained by anaemia and Barthel Index ≤ 30, the latter being the strongest predictor. CONCLUSIONS: Real-world patients with HF and hospitalized in IM are frequently very old, frail and with multiple comorbidities. Functional and cognitive status significantly influence patients' outcome, and this could lead to a rethinking of the overall (in-hospital but also home-based) management of HF.


Assuntos
Nível de Saúde , Insuficiência Cardíaca/mortalidade , Insuficiência Cardíaca/fisiopatologia , Pacientes Internados/estatística & dados numéricos , Qualidade de Vida , Adulto , Idoso , Idoso de 80 Anos ou mais , Comorbidade , Feminino , Insuficiência Cardíaca/terapia , Mortalidade Hospitalar , Humanos , Medicina Interna/estatística & dados numéricos , Tempo de Internação/estatística & dados numéricos , Masculino , Pessoa de Meia-Idade , Análise Multivariada , Valor Preditivo dos Testes , Prognóstico , Recuperação de Função Fisiológica , Índice de Gravidade de Doença
2.
Audiol Neurootol ; 15(2): 111-5, 2010.
Artigo em Inglês | MEDLINE | ID: mdl-19657186

RESUMO

AIMS/HYPOTHESIS: Idiopathic sudden sensorineural hearing loss (ISSNHL) represents an acute inner ear disorder with an overall incidence of 5-20/100000 individuals per year in western countries. No clear causes for this disease have been found so far, but cochlear ischemia has been hypothesized as one of the etiopathological mechanisms. The aim of our study was to assess the role of diabetes and traditional cardiovascular risk factors in the pathogenesis of ISSNHL. MATERIALS/METHODS: Case-control study of 141 patients (75 males/66 females) matched for age and gender. Cases were affected by ISSNHL, defined as a sudden hearing loss > or =30 dB, within 3 frequencies, developing over 72 h. The control group was composed of 271 sex- and age-matched subjects (142 males/129 females) who agreed to participate in this observational study and provided blood samples for laboratory investigations. Cardiovascular risk factors examined were: diabetes mellitus, smoking history, hypercholesterolemia, hypertriglyceridemia and hypertension. RESULTS: On the univariate analysis, diabetes prevalence was higher in the ISSNHL group (15.6%) compared to controls (8.5%) (p = 0.03). Also hypercholesterolemia was significantly more frequent in the ISSNHL group compared to the control population. There were no statistically significant differences between the 2 populations concerning other cardiovascular risk factors. The risk of ISSNHL tended to increase as the number of cardiovascular risk factors increased (p for linear trend = 0.018). CONCLUSIONS: Our findings suggest that diabetes mellitus, hypercholesterolemia and a high burden of cardiovascular risk factors are associated with the risk of ISSNHL.


Assuntos
Doenças Cardiovasculares/epidemiologia , Diabetes Mellitus Tipo 2/epidemiologia , Perda Auditiva Súbita/epidemiologia , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Doenças Cardiovasculares/complicações , Estudos de Casos e Controles , Causalidade , Comorbidade , Feminino , Perda Auditiva Súbita/etiologia , Humanos , Hipercolesterolemia/complicações , Hipercolesterolemia/epidemiologia , Hipertensão/complicações , Hipertensão/epidemiologia , Hipertrigliceridemia/complicações , Hipertrigliceridemia/epidemiologia , Itália , Masculino , Pessoa de Meia-Idade , Fatores de Risco , Fumar/efeitos adversos , Fumar/epidemiologia , Adulto Jovem
3.
Acta Otorhinolaryngol Ital ; 27(3): 123-5, 2007 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-17883188

RESUMO

Aim of this study was to investigate any eventual quantitative variations in the serological concentration of parathormone in a homogenous sample of patients suffering from laryngeal squamous cell carcinoma who underwent only surgery. A total of 12 patients (2 female, 10 male), aged between 58 and 76 years, were treated between June 2002 and June 2003. The patients were all affected by T2-T3 laryngeal squamous cell carcinoma. Serum intact parathyroid hormone and calcaemia were measured pre- and post-operatively. Of these patients, 2 underwent total laryngectomy (including thyroid isthmectomy), 5 patients received partial supraglottic laryngectomy, while the remaining 5 were submitted to supracricoid laryngectomy. Results showed a progressive regression of parathyroid hormone level, in only one case and was not, however, below normal limits. Contrary to data reported in the literature, this study indicated that the incidence of hypoparathyroidism following laryngeal surgery, even in radical surgical approaches, proved to be closer to zero.


Assuntos
Carcinoma de Células Escamosas/metabolismo , Neoplasias Laríngeas/metabolismo , Glândulas Paratireoides/metabolismo , Hormônio Paratireóideo/metabolismo , Idoso , Carcinoma de Células Escamosas/epidemiologia , Carcinoma de Células Escamosas/cirurgia , Feminino , Humanos , Hipercalcemia/epidemiologia , Hipoparatireoidismo/epidemiologia , Neoplasias Laríngeas/epidemiologia , Neoplasias Laríngeas/cirurgia , Laringectomia , Masculino , Pessoa de Meia-Idade
4.
Intern Emerg Med ; 2(2): 95-9, 2007 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-17622495

RESUMO

OBJECTIVE: Investigate the prevalence of difficult hospital discharges (DHD), describe clinical and social patients' characteristics as potential reasons for discharge delays in an internal medicine ward and implement tailored post-discharge care. METHODS: During the year 2005 we analysed, in a middle-sized country hospital, all the patients for which some delay for discharge, owing to their whole complexity, was presumable. Comprehensive multidimensional assessment, clinical-social risk score, specific needs of care, mean of stay and outcomes were evaluated. RESULTS: 68.5% of DHD patients were >/=80 years old, with 3.8 the mean number of diseases per patient; 57.5% presented a loss of autonomy (ADL) just before acute deterioration; 80% were functionally and/or cognitively impaired. Only 5% had suitable family support; 5.1% were living at a nursing home; 2% were living alone. The most frequent causes of admission were stroke, cognitive impairment-dementia, cardiovascular diseases, fractures and cancer. Mean length of stay was 12 days. Fifty-two percent of patients were discharged home, 30% were admitted to a long-term care facility, 1% to hospice and 17% died during their hospital stay. CONCLUSIONS: The aim of "coordinated care" (i.e., targeting "at-risk" patients with assessment of medical, functional, social and emotional needs; provision of optimal medical treatment, self-care education, integrated services, monitoring of progress and early signs of problems) is to improve health outcomes and reduce costs. More than 80% of DHDs patients, with specific tailored programmes, may be discharged from hospital, with satisfactory solutions for them and their families.


Assuntos
Unidades Hospitalares/estatística & dados numéricos , Medicina Interna/estatística & dados numéricos , Alta do Paciente/estatística & dados numéricos , Idoso de 80 Anos ou mais , Feminino , Avaliação Geriátrica , Hospitais de Condado/estatística & dados numéricos , Humanos , Tempo de Internação/estatística & dados numéricos , Masculino , Admissão do Paciente/estatística & dados numéricos , Prevalência
5.
Otolaryngol Head Neck Surg ; 129(6): 733-8, 2003 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-14663443

RESUMO

OBJECTIVE: Our goal was to evaluate thyroid function before and after surgery only or radiotherapy plus surgery for laryngeal neoplasms. STUDY DESIGN AND SETTING: The study group consisted of a total of 30 patients with laryngeal cancer (22 treated with surgery only and 8 treated with surgery plus radiotherapy) who were evaluated by ultrasensitive thyroid-stimulating hormone, free T4, and antithyroid antibodies both preoperatively and at 6 and 12 months after surgery. RESULTS: All patients had normal thyroid function before treatment (1 patient had elevated antithyroid autoantibodies); after 1 year, 4 (13.34%) patients were hypothyroid. In 3 patients, it was subclinical (ie, elevated thyroid-stimulating hormone with normal free T4), and in 1 patient, it was symptomatic. CONCLUSION: Our preliminary data suggest that hypothyroidism occurs in a small but substantial proportion of patients undergoing surgery with or without adjuvant radiotherapy for laryngeal cancer. SIGNIFICANCE: Thyroid hormone dosing should be routinely included in the assessment of patients with laryngeal cancer, because it is simple and inexpensive and may allow the early diagnosis and management of hypothyroidism.


Assuntos
Hipotireoidismo/etiologia , Neoplasias Laríngeas/radioterapia , Neoplasias Laríngeas/cirurgia , Complicações Pós-Operatórias , Glândula Tireoide/fisiopatologia , Idoso , Feminino , Humanos , Hipotireoidismo/epidemiologia , Hipotireoidismo/fisiopatologia , Incidência , Neoplasias Laríngeas/complicações , Laringectomia , Masculino , Pessoa de Meia-Idade , Radioterapia Adjuvante/efeitos adversos , Testes de Função Tireóidea
6.
Recenti Prog Med ; 92(7-8): 464-6, 2001.
Artigo em Italiano | MEDLINE | ID: mdl-11475790

RESUMO

The authors describe the case of a 58 years old man, affected by severe obesity, alcohol addict, observed because of a retromandibular mass, measuring 6 cm. Clinical and instrumental findings indicated the presence of a mass apparently due to a parotid abscess; no evident lesions appeared at the examination of the ENT regions. Ultrasonography and fine needle aspiration cytology revealed the presence of a cystic cervical metastasis of a squamous cell carcinoma arising from an occult tonsillar cancer. The authors describe diagnostic procedures, differential diagnosis, treatment and peculiar aspects related to staging and follow-up.


Assuntos
Carcinoma de Células Escamosas/secundário , Neoplasias de Cabeça e Pescoço/secundário , Neoplasias Tonsilares/diagnóstico , Carcinoma de Células Escamosas/diagnóstico , Carcinoma de Células Escamosas/diagnóstico por imagem , Carcinoma de Células Escamosas/cirurgia , Diagnóstico Diferencial , Seguimentos , Neoplasias de Cabeça e Pescoço/diagnóstico , Neoplasias de Cabeça e Pescoço/diagnóstico por imagem , Humanos , Imageamento por Ressonância Magnética , Masculino , Pessoa de Meia-Idade , Fatores de Tempo , Tomografia Computadorizada por Raios X , Neoplasias Tonsilares/diagnóstico por imagem , Neoplasias Tonsilares/cirurgia , Ultrassonografia
7.
Recenti Prog Med ; 92(12): 754-5, 2001 Dec.
Artigo em Italiano | MEDLINE | ID: mdl-11822097

RESUMO

A case of a 51-year-old man admitted to the hospital for hemoptysis after a three-week history of fever and cough is presented. The chest x-ray film revealed consolidation in the left upper lobe. Because microbiologic studies of the bronchial lavage showed the grew of Pseudomonas aeruginosa, the patient was treated with piperacilline and pefloxacin. Haemoptysis and abnormal temperature was persistent for several days. Revaluation of the chest x-ray permitted to discover a little calcified nodule of 1 mm diameter. CT scan of the thorax confirmed the consolidation of the left upper lobe and the little calcification. A second fiberoptic bronchoscopy was performed in 10th day, using a bronchoscope with a smaller diameter; it was possible to observe the occlusion of the subsegment bronchus LB 1&2 due to a mobile protruding mass. The mass was gentle removed by the use of alligator bioptic forceps; it presented as a grey, hard, 2 mm diameter body with irregular surface like a "floating mine". On microscopical examination of the mass, aspergillus hyphae appeared as broad septate filaments. Culture of the samples were negative. Haemoptysis and fever stopped after FOB. Chest x-ray in 19th day was negative: consolidation and calcification were absent.


Assuntos
Aspergilose/complicações , Broncopatias/complicações , Cálculos/complicações , Hemoptise/etiologia , Pneumopatias Fúngicas/complicações , Pneumonia/etiologia , Broncopatias/diagnóstico , Broncopatias/diagnóstico por imagem , Broncopatias/terapia , Broncoscopia , Cálculos/diagnóstico , Cálculos/diagnóstico por imagem , Cálculos/terapia , Seguimentos , Humanos , Masculino , Pessoa de Meia-Idade , Radiografia Torácica , Fatores de Tempo , Tomografia Computadorizada por Raios X
8.
Recenti Prog Med ; 90(5): 264-6, 1999 May.
Artigo em Italiano | MEDLINE | ID: mdl-10380554

RESUMO

Recent works show an increase of the incidence of extrapulmonary tuberculosis with a peculiar localization to the middle ear, until now considered a rare clinical manifestation. At the Ear, Noise, Throat Clinic of the University of Ferrara a total of 5 cases of tuberculous otitis media were observed during the last 25 years. Aim of the present study is to describe their clinical manifestations, their symptomatic aspects and the way to reach a careful diagnosis and more rapid therapeutic choice.


Assuntos
Otite Média/diagnóstico , Tuberculose/diagnóstico , Adulto , Antibacterianos , Antibióticos Antituberculose/uso terapêutico , Terapia Combinada , Quimioterapia Combinada/uso terapêutico , Feminino , Transtornos da Audição/diagnóstico , Transtornos da Audição/etiologia , Transtornos da Audição/terapia , Humanos , Masculino , Pessoa de Meia-Idade , Otite Média/complicações , Otite Média/terapia , Reoperação , Tuberculose/complicações , Tuberculose/terapia , Timpanoplastia
9.
J Endocrinol Invest ; 19(3): 170-4, 1996 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-8743283

RESUMO

Patients with Retinitis Pigmentosa (RP) show hemeralopia, restricted field of vision and reduced visual acuity, owing to the degeneration and proliferation of photoreceptors and a retinal pigment epithelium. The prevalence in Italy is 1:4,000. A certain number of "syndromic" associations have been described, and, in particular, also that with hypothyroidism, but very few cases have been studied. We describe a family of 40 people, spanning four generations, in which we have recorded the presence of autosomic dominant RP, associated with autoimmune hypothyroidism or with circulating antithyroid autoantibodies (ATA), currently considered as the expression of active autoimmune thyroiditis or a risk factor for this complaint. We measured, in all members, TSH, FT3, FT4, antithyroglobulin and antithyroperoxidase autoantibodies. A fundus oculi examination was performed in every subject, as well as a careful examine of the anterior region on the neck. A control population of 100 healthy people was also studied. Our data show a higher prevalence of ATA, statistically significant, in the patients with RP and in their relatives, compared with the control population and the data from the literature (13 cases over 40 = 32.5%; p < 0.01). 3 patients with RP and ATA were affected by clinically evident hypothyroidism. 10 patients with ATA were clinically euthyroid; 8 patients affected by RP did not show circulating ATA at the time of the study. The interest for the physician in this "syndromic" retinal distrophy reflects the need, emerging from our data, to test the thyroid function in the subjects with RP and in members of their families, since circulating ATA are considered a risk factor for the development of autoimmune hypothyroidism.


Assuntos
Doenças Autoimunes , Hipotireoidismo/imunologia , Retinose Pigmentar/imunologia , Autoanticorpos/sangue , Feminino , Humanos , Itália , Masculino , Linhagem , Retinose Pigmentar/genética , Fatores de Risco , Glândula Tireoide/imunologia
10.
Recenti Prog Med ; 84(4): 263-71, 1993 Apr.
Artigo em Italiano | MEDLINE | ID: mdl-8488331

RESUMO

Community-acquired pneumonias represent the first cause of mortality due to a infectious disease, and determine more than 500,000 hospitalizations per year in the USA: moreover, they are the terminal event in many geriatric patients. Although the etiological microbial agents responsible for the majority of such pneumonias, Haemophilus influenzae and Streptococcus pneumoniae, are still sensitive to traditional antibiotics, as ampicillin, many doctors treat community acquired pneumonias with more recent and expensive antibiotics, as the third generation cephalosporins or other beta-lactamines, so enhancing the cost of the treatments, without a known, real advantage with respect to the older therapies. In this study, to evaluate whether the use of the latter antibiotics improves the outcome of community acquired pneumonias of the elderly with respect to the traditional therapy with ampicillin, we studied 123 hospitalized patients older than 65 years, affected by community-acquired pneumonia, simple or complicated. We also evaluated the cost/benefit ratio of every single treatment. Our data demonstrate that the recent antibiotics do not influence the outcome of the disease of the elderly: in particular, they do not affect the duration of the hospitalization, do not have a lower incidence of side effects, do not show a better efficacy versus ampicillin. The cost of the treatment with ampicillin is about one third of the cost of a third-generation cephalosporin treatment. We conclude that the treatment of choice for community acquired pneumonias of the elderly is ampicillin; only in few cases, as in nosocomial or in nursing homes pneumonias, third-generation cephalosporins or other antibiotics are necessary.


Assuntos
Antibacterianos/economia , Broncopneumonia/economia , Idoso , Idoso de 80 Anos ou mais , Antibacterianos/uso terapêutico , Broncopneumonia/tratamento farmacológico , Broncopneumonia/epidemiologia , Distribuição de Qui-Quadrado , Análise Custo-Benefício , Humanos , Itália/epidemiologia , Tempo de Internação/economia , Tempo de Internação/estatística & dados numéricos , Indução de Remissão , Fatores de Tempo
13.
Horm Metab Res ; 19(6): 275-7, 1987 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-3623417

RESUMO

Calcitonin is a potent inhibitor of bone resorption and in both sexes, plasma levels progressively decrease with age: therefore, a relative deficiency of calcitonin may be involved in the pathogenesis of osteoporosis in the elderly. Calcitonin plasma levels of young hypogonadic men with osteoporosis are significantly lower than controls: the hypothesis that the decreased calcitonin plasma levels in the elderly are due to a reduced secretory capacity of the "C" cells of the thyroid gland, related to age, does not explain the low calcitonin plasma levels found in young hypogonadic osteoporotic men. Our hypothesis is that gonadal steroid deficiency may participate in the mechanisms regulating calcitonin secretion. Therefore, we studied ten males affected by hypogonadotropic hypogonadism and ten normal men, of comparable age, as controls: we measured plasma levels of testosterone, 17 beta estradiol, androstenedione and calcitonin, and the response of calcitonin to an i.v. bolus of pentagastrin, a well known "C" cells stimulatory drug. Testosterone and calcitonin plasma levels and the response of calcitonin to pentagastrin were also evaluated after 6 months of replacement therapy with testosterone. Basal levels of testosterone, 17 beta estradiol, androstenedione and calcitonin, and the response of calcitonin to pentagastrin, are significantly lower in our patients than in controls, demonstrating that hypogonadotropic hypogonadic subjects have a lower secretory reserve of calcitonin. After testosterone therapy the basal calcitonin plasma levels and its response to pentagastrin stimulus did not differ from controls, suggesting that gonadal steroids influence the calcitonin secretion and reserve. Our data cannot clarify whether osteoporosis of hypogonadotropic hypogonadic patients is related to androgen or estrogen deficiency; however, they suggest that the mechanisms by which gonadal steroid influence bone metabolism may involve calcitonin secretion.


Assuntos
Calcitonina/sangue , Hipogonadismo/sangue , Osteoporose/sangue , Adulto , Androstenodiona/sangue , Estradiol/sangue , Humanos , Hipogonadismo/tratamento farmacológico , Masculino , Pentagastrina/farmacologia , Testosterona/sangue , Testosterona/uso terapêutico
14.
Andrologia ; 19(2): 148-52, 1987.
Artigo em Inglês | MEDLINE | ID: mdl-2891322

RESUMO

Ex-cryptorchid subjects are frequently affected by infertility, even if the usually determined seminal parameters are still within the normal range. We evaluated in this study, in 14 ex-unilateral cryptorchid adult males (22-28 years), with normal sperm concentration, morphology and viability, the resistance of sperm nuclear chromatin to denaturation, using the fluorochrome acridine orange, which fluorescences green when bound to native DNA (double stranded) and red when bound to denaturated DNA (single stranded). Our findings demonstrate that the percentage of green-stained cells with acridine orange was significantly lower in our patients than in controls (p less than 0.001). We therefore suggest that the chromatin of ex-cryptorchid subjects' spermatozoa has a decreased resistance to denaturation and we hypothesize that this finding may explain the infertility of these patients, when the common seminal parameters are still within the normal range.


Assuntos
Cromatina/ultraestrutura , Criptorquidismo/genética , Cabeça do Espermatozoide/ultraestrutura , Espermatozoides/ultraestrutura , Laranja de Acridina , Adulto , Criptorquidismo/complicações , Hormônio Foliculoestimulante/sangue , Humanos , Infertilidade Masculina/etiologia , Hormônio Luteinizante/sangue , Masculino , Motilidade dos Espermatozoides
16.
J Endocrinol Invest ; 8(4): 377-9, 1985 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-4067209

RESUMO

The aim of this study was to ascertain whether there was an interrelationship between male osteoporosis, calcitonin and androgens. Ten young hypogonadal osteoporotic men were studied: testosterone and calcitonin plasma levels were measured before and after therapy with testosterone enanthate (200 mg im every three weeks for four months). In these patients testosterone and calcitonin plasma levels were significantly lower than controls, before therapy (p less than 0.001 and p less than 0.01 respectively). Testosterone treatment significantly increased (p less than 0.05) serum calcitonin. The conclusion was that androgen deficiency may cause osteoporosis also by decreasing calcitonin secretion.


Assuntos
Calcitonina/sangue , Hipogonadismo/complicações , Osteoporose/etiologia , Testosterona/sangue , Adulto , Androstenodiona/sangue , Estradiol/sangue , Humanos , Hipogonadismo/sangue , Síndrome de Klinefelter/sangue , Síndrome de Klinefelter/complicações , Masculino , Osteoporose/sangue
17.
Horm Metab Res ; 17(6): 319-20, 1985 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-4018722

RESUMO

The aim of this study was to ascertain whether there is a correlation between gonadal steroids and opioid control of prolactin (PRL) secretion. Four castrated men, aged 18 to 24 years were submitted to intravenous injection of 250 ug of a met-enkephalin analog (D-Ala2-Mephe4-Met-(o)-ol-Enkephalin, FK 33824) (DAMME). In normal men DAMME injection was also performed on the 6th day after treatment with clomiphene citrate (CC) (200 mg/day for 5 days), a specific nonsteroidal estrogen receptor blocker. In castrated men and in normal men after CC treatment, there was a lower PRL response to DAMME than in controls (P less than 0.0005). These results suggest that gonadal steroid deficiency seems to cause a change in the opioid system and/or dopaminergic control of prolactin secretion.


Assuntos
Castração , D-Ala(2),MePhe(4),Met(0)-ol-encefalina/farmacologia , Prolactina/metabolismo , Adolescente , Adulto , Clomifeno/farmacologia , Estradiol/sangue , Humanos , Masculino , Taxa Secretória/efeitos dos fármacos , Testosterona/sangue
18.
Clin Endocrinol (Oxf) ; 22(4): 539-43, 1985 Apr.
Artigo em Inglês | MEDLINE | ID: mdl-3987071

RESUMO

In order to ascertain whether there is a relation between opioids and the serotoninergic system in prolactin (PRL) secretion increase, we investigated in seven healthy men (21 to 26 years of age) the effect of naloxone, a specific opioid antagonist, on PRL secretion induced by fenfluramine, a drug that stimulates serotonin release and inhibits its re-uptake. We observed that subjects receiving fenfluramine (60 mg orally) had a significantly (P less than 0.001) higher increase in PRL plasma levels than the controls receiving placebo. In all subjects naloxone infusion at a dose of 15 mg caused a significant reduction (P less than 0.0005) in the PRL response to fenfluramine. Higher doses of naloxone (30 mg) do not further inhibit the PRL secretion induced by fenfluramine. These results suggest that naloxone may interact with opiate receptors on serotonin neurons thereby reducing the synthesis and release of serotonin. It seems that in man, therefore, there is an interplay between opiates and the serotoninergic system in the facilitatory influence on PRL release.


Assuntos
Fenfluramina/farmacologia , Naloxona/farmacologia , Prolactina/sangue , Adulto , Humanos , Masculino , Prolactina/metabolismo
19.
Fertil Steril ; 43(3): 447-50, 1985 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-3979585

RESUMO

Endogenous opioid peptides exert a tonic inhibition on gonadotropin secretion at the hypothalamic level, but the mechanisms by which they act are still unknown. Previous experimental studies suggest that the endogenous opioid peptides change dopaminergic and serotoninergic tones at the hypothalamic level. We have investigated whether the stimulatory effect of naloxone on luteinizing hormone (LH) secretion is due to its influence on these neurotransmitters. Two experimental models were studied, and two sets of effects on LH secretion induced by intravenous naloxone infusion (20 mg over 2 hours) in 14 normal men 20 to 25 years of age were evaluated: the effect of oral sulpiride (150 mg), a potent dopaminergic antagonist, and the effect of oral fenfluramine (60 mg), a drug that stimulates the serotoninergic receptors by releasing serotonin and inhibiting its reuptake. The study demonstrated that naloxone infusion significantly stimulated the LH secretion throughout the period of observation (P less than 0.01 versus saline). The pretreatment with sulpiride did not change the LH response to naloxone. After fenfluramine pretreatment, naloxone failed to induce any rise in LH secretion. Follicle-stimulating hormone did not show any important variation in either test. The data suggest that in man the stimulatory ability of the opiate receptor antagonist naloxone to elicit a rise in LH plasma levels may involve the serotoninergic, but not the dopaminergic, hypothalamic system. This hypothesis, however, does not exclude the involvement of other hypothalamic neurotransmitters.


Assuntos
Dopamina/fisiologia , Hormônio Luteinizante/metabolismo , Naloxona/farmacologia , Serotonina/fisiologia , Adulto , Fenfluramina/farmacologia , Humanos , Hipotálamo/fisiologia , Masculino , Receptores Dopaminérgicos/efeitos dos fármacos , Receptores de Serotonina/efeitos dos fármacos , Sulpirida/farmacologia
20.
Fertil Steril ; 42(6): 942-5, 1984 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-6437880

RESUMO

The aim of this study was to ascertain whether an interrelationship exists between gonadal steroids and the inhibition of gonadotropin secretion by dopamine. The effect of dopamine infusion (4 micrograms/kg/minute intravenously) on gonadotropin plasma levels in four castrated men (18 to 23 years of age) and in four age-matched normal men was studied. Normal subjects were studied before and after treatment with a specific nonsteroidal estrogen receptor antagonist, CC. LH plasma levels in normal subjects receiving CC had a maximum decrease percentage and a net decrease significantly greater (P less than 0.005 and P less than 0.012, respectively) than those before CC treatment. In castrated subjects the maximum decrease percentage was significantly greater (P less than 0.005) than in control subjects, but it did not show any difference from that of normal subjects receiving CC. In none of the group were significant changes in FSH concentration observed. The findings suggest that whenever there is a gonadal steroid deficiency, dopamine infusion causes an increased sensitivity to LH inhibition. This may be due to a lower endogenous dopaminergic influence on LH secretion.


Assuntos
Dopamina/farmacologia , Hormônio Foliculoestimulante/metabolismo , Hormônios Esteroides Gonadais/fisiologia , Hormônio Luteinizante/metabolismo , Adolescente , Adulto , Androgênios/fisiologia , Castração , Clomifeno/farmacologia , Antagonistas de Estrogênios , Estrogênios/fisiologia , Hormônio Foliculoestimulante/sangue , Humanos , Hormônio Luteinizante/sangue , Masculino , Radioimunoensaio
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