RESUMO
BACKGROUND: Patients with prostate cancer suffer significant sexual dysfunction after treatment which negatively affects them and their partners psychologically, and strain their relationships. AIM: We convened an international panel with the aim of developing guidelines that will inform clinicians, patients and partners about the impact of prostate cancer therapies (PCT) on patients' and partners' sexual health, their relationships, and about biopsychosocial rehabilitation in prostate cancer (PC) survivorship. METHODS: The guidelines panel included international expert researchers and clinicians, and a guideline methodologist. A systematic review of the literature, using the Ovid MEDLINE, Scopus, CINAHL, PsychINFO, LGBT Life, and Embase databases was conducted (1995-2022) according to the Cochrane Handbook for Systematic Reviews of Interventions. Study selection was based on Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. Each statement was assigned an evidence strength (A-C) and a recommendation level (strong, moderate, conditional) based on benefit/risk assessment, according to the nomenclature of the American Urological Association (AUA). Data synthesis included meta-analyses of studies deemed of sufficient quality (3), using A Measurement Tool to Assess Systematic Reviews (AMSTAR). OUTCOMES: Guidelines for sexual health care for patients with prostate cancer were developed, based on available evidence and the expertise of the international panel. RESULTS: The guidelines account for patients' cultural, ethnic, and racial diversity. They attend to the unique needs of individuals with diverse sexual orientations and gender identities. The guidelines are based on literature review, a theoretical model of sexual recovery after PCT, and 6 principles that promote clinician-initiated discussion of realistic expectations of sexual outcomes and mitigation of sexual side-effects through biopsychosocial rehabilitation. Forty-seven statements address the psychosexual, relationship, and functional domains in addition to statements on lifestyle modification, assessment, provider education, and systemic challenges to providing sexual health care in PC survivorship. CLINICAL IMPLICATIONS: The guidelines provide clinicians with a comprehensive approach to sexual health care for patients with prostate cancer. STRENGTHS & LIMITATIONS: The strength of the study is the comprehensive evaluation of existing evidence on sexual dysfunction and rehabilitation in prostate cancer that can, along with available expert knowledge, best undergird clinical practice. Limitation is the variation in the evidence supporting interventions and the lack of research on issues facing patients with prostate cancer in low and middle-income countries. CONCLUSION: The guidelines document the distressing sexual sequelae of PCT, provide evidence-based recommendations for sexual rehabilitation and outline areas for future research. Wittmann D, Mehta A, McCaughan E, et al. Guidelines for Sexual Health Care for Prostate Cancer Patients: Recommendations of an International Panel. J Sex Med 2022;19:1655-1669.
Assuntos
Sobreviventes de Câncer , Neoplasias da Próstata , Disfunções Sexuais Fisiológicas , Saúde Sexual , Humanos , Masculino , Neoplasias da Próstata/complicações , Neoplasias da Próstata/terapia , Comportamento Sexual , Disfunções Sexuais Fisiológicas/etiologia , Disfunções Sexuais Fisiológicas/terapiaRESUMO
INTRODUCTION: Inadequate treatment of men with erectile dysfunction (ED) subjects them and their partners to lost quality of life, yet little is known about the cause and duration of symptoms that lead to penile prosthesis (PP) placement. AIM: We performed a systematic review addressing cause and duration of symptoms before implantation. METHODS: We searched PubMed, Embase, and Cochrane for articles published between January 1, 1965-July 20, 2016, reporting on PP for ED. Studies were assessed for quality. Body of evidence strength was categorized in accordance to American Urological Association (AUA) categorization: grade A (well-conducted, highly-generalizable randomized controlled trials (RCTs) or exceptionally strong observational studies with consistent findings), grade B (RCTs with some weaknesses of procedure/generalizability or moderately strong observational studies with consistent findings), or grade C (RCTs with serious deficiencies of procedure/generalizability, have small sample sizes, or other problems that potentially confound interpretation). This review was performed as part of the 2018 AUA ED Clinical Guidelines, with the support of the AUA. MAIN OUTCOME MEASURES: Cause and duration of symptoms before PP were assessed. RESULTS: We reviewed 113 articles constituting 150 study arms. All studies were observational (body of evidence strength grade C). Of these arms, only 19 reported on ED duration. Mean duration was 56 months for men undergoing inflatable penile prosthesis (IPP) placement (38.7 months for those after prostatectomy) and 72 months for those undergoing malleable penile prosthesis placement. Diabetic patients undergoing IPP had mean ED duration of 75 months. Among arms reporting on IPPs, causes of ED were vascular disease (47 arms; range 2.9-62.0%; mean 31.9%), diabetes (61 arms; range 12.8-77.8%; mean 28.3%), and pelvic surgery or trauma (49 arms; range 0.5-49.7%; mean 20.3%). CONCLUSION: Nearly all men undergoing PP have ED of organic causes, whereas diabetic patients and patients receiving malleable penile prosthesis have the longest ED duration. Factors driving this relative delay require additional investigation. Post-prostatectomy IPP placement is offered relatively late, on average. Bajic P, Mahon J, Faraday M, et al. Etiology of Erectile Dysfunction and Duration of Symptoms in Patients Undergoing Penile Prosthesis: A Systematic Review. Sex Med Rev 2020;8:333-337.
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Disfunção Erétil/etiologia , Disfunção Erétil/cirurgia , Prótese de Pênis , Humanos , Masculino , Fatores de TempoRESUMO
PURPOSE: The purpose of this guideline is to provide a clinical framework for the diagnosis and treatment of Peyronie's disease. MATERIALS AND METHODS: A systematic review of the literature using the PubMed®, EMBASE® and Cochrane databases (search dates 1/1/1965 to 1/26/15) was conducted to identify peer-reviewed publications relevant to the diagnosis and treatment of PD. The review yielded an evidence base of 303 articles after application of inclusion/exclusion criteria. RESULTS: The systematic review was used to create guideline statements regarding treatment of PD. When sufficient evidence existed, the body of evidence for a particular treatment was assigned a strength rating of A (high quality evidence; high certainty), B (moderate quality evidence; moderate certainty), or C (low quality evidence; low certainty). Evidence-based statements of Strong, Moderate, or Conditional Recommendation were developed based on benefits and risks/burdens to patients. Additional consensus statements related to the diagnosis of PD are provided as Clinical Principles and Expert Opinions due to insufficient published evidence. CONCLUSIONS: There is a continually expanding literature on PD; the Panel notes that this document constitutes a clinical strategy and is not intended to be interpreted rigidly. The most effective approach for a particular patient is best determined by the individual clinician and patient in the context of that patient's history, values, and goals for treatment. As the science relevant to PD evolves and improves, the strategies presented here will be amended to remain consistent with the highest standards of clinical care.
Assuntos
Induração Peniana/diagnóstico , Induração Peniana/terapia , Algoritmos , Humanos , MasculinoRESUMO
PURPOSE: The purpose of this amendment is to provide an updated clinical framework for the diagnosis and treatment of interstitial cystitis/bladder pain syndrome based upon data received since the publication of original guideline in 2011. MATERIALS AND METHODS: A systematic literature review using the MEDLINE(®) database (search dates 1/1/83-7/22/09) was conducted to identify peer-reviewed publications relevant to the diagnosis and treatment of IC/BPS. This initial review yielded an evidence base of 86 treatment articles after application of inclusion/exclusion criteria. The AUA update literature review process, in which an additional systematic review is conducted periodically to maintain guideline currency with newly published relevant literature, was conducted in July 2013. This review identified an additional 31 articles, which were added to the evidence base of this Guideline. RESULTS: Newly incorporated literature describing the treatment of IC/BPS was integrated into the Guideline with additional treatment information provided as Clinical Principles and Expert Opinions when insufficient evidence existed. The diagnostic portion of the Guideline remains unchanged from the original publication and is still based on Expert Opinions and Clinical Principles. CONCLUSIONS: The management of IC/BPS continues to evolve as can be seen by an expanding literature on the topic. This document constitutes a clinical strategy and is not intended to be interpreted rigidly. The most effective approach for a particular patient is best determined by the individual clinician and patient. As the science relevant to IC/BPS evolves and improves, the strategies presented will require amendment to remain consistent with the highest standards of care.
Assuntos
Cistite Intersticial/diagnóstico , Cistite Intersticial/terapia , HumanosRESUMO
PURPOSE: The purpose of this guideline was to provide a clinical framework for the use of radiation therapy after radical prostatectomy as adjuvant or salvage therapy. METHODS AND MATERIALS: A systematic literature review using PubMed, Embase, and Cochrane database was conducted to identify peer-reviewed publications relevant to the use of radiation therapy after prostatectomy. The review yielded 294 articles; these publications were used to create the evidence-based guideline statements. Additional guidance is provided as Clinical Principles when insufficient evidence existed. RESULTS: Guideline statements are provided for patient counseling, use of radiation therapy in the adjuvant and salvage contexts, defining biochemical recurrence, and conducting a restaging evaluation. CONCLUSIONS: Physicians should offer adjuvant radiation therapy to patients with adverse pathologic findings at prostatectomy (ie, seminal vesicle invastion, positive surgical margins, extraprostatic extension) and salvage radiation therapy to patients with prostate-specific antigen (PSA) or local recurrence after prostatectomy in whom there is no evidence of distant metastatic disease. The offer of radiation therapy should be made in the context of a thoughtful discussion of possible short- and long-term side effects of radiation therapy as well as the potential benefits of preventing recurrence. The decision to administer radiation therapy should be made by the patient and the multidisciplinary treatment team with full consideration of the patient's history, values, preferences, quality of life, and functional status. The American Society for Radiation Oncology and American Urological Association websites show this guideline in its entirety, including the full literature review.
Assuntos
Prostatectomia , Neoplasias da Próstata/radioterapia , Radioterapia (Especialidade)/normas , Radioterapia Adjuvante/normas , Terapia de Salvação/normas , Urologia/normas , Humanos , Masculino , Educação de Pacientes como Assunto/normas , Antígeno Prostático Específico/sangue , Radioterapia Adjuvante/efeitos adversos , Terapia de Salvação/efeitos adversos , Sociedades Médicas , Estados UnidosRESUMO
PURPOSE: The purpose of this guideline is to provide a clinical framework for the use of radiotherapy after radical prostatectomy as adjuvant or salvage therapy. MATERIALS AND METHODS: A systematic literature review using the PubMed®, Embase, and Cochrane databases was conducted to identify peer-reviewed publications relevant to the use of radiotherapy after prostatectomy. The review yielded 294 articles; these publications were used to create the evidence-based guideline statements. Additional guidance is provided as Clinical Principles when insufficient evidence existed. RESULTS: Guideline statements are provided for patient counseling, the use of radiotherapy in the adjuvant and salvage contexts, defining biochemical recurrence, and conducting a re-staging evaluation. CONCLUSIONS: Physicians should offer adjuvant radiotherapy to patients with adverse pathologic findings at prostatectomy (i.e., seminal vesicle invasion, positive surgical margins, extraprostatic extension) and should offer salvage radiotherapy to patients with prostatic specific antigen or local recurrence after prostatectomy in whom there is no evidence of distant metastatic disease. The offer of radiotherapy should be made in the context of a thoughtful discussion of possible short- and long-term side effects of radiotherapy as well as the potential benefits of preventing recurrence. The decision to administer radiotherapy should be made by the patient and the multi-disciplinary treatment team with full consideration of the patient's history, values, preferences, quality of life, and functional status. Please visit the ASTRO and AUA websites (http://www.redjournal.org/webfiles/images/journals/rob/RAP%20Guideline.pdf and http://www.auanet.org/education/guidelines/radiation-after-prostatectomy.cfm) to view this guideline in its entirety, including the full literature review.
Assuntos
Prostatectomia , Neoplasias da Próstata/radioterapia , Neoplasias da Próstata/cirurgia , Terapia de Salvação , Humanos , Masculino , Invasividade Neoplásica , Neoplasias da Próstata/patologia , Radioterapia AdjuvanteRESUMO
BACKGROUND AND PURPOSE: With the increased incidence of low-stage renal cancers, thermal ablation technology has emerged as a viable treatment option for extirpation in selected persons and is supported by the current American Urological Association guidelines. We present a 9-year, single institution experience with radiofrequency ablation (RFA) using real-time peripheral temperature monitoring of small renal masses focusing on oncologic outcomes. PATIENTS AND METHODS: We reviewed our prospectively collected database of patients with renal masses who were treated between November 2001 and January 2011 with laparoscopic (LRFA) or CT-guided percutaneous RFA (CTRFA) with simultaneous real-time peripheral fiberoptic thermometry. Patients were followed radiographically at 1 month, 6 months, 1 year, and then annually. Clinicopathologic outcomes were collected and analyzed. RESULTS: A total of 274 patients (211 male) aged 18 to 88 years (mean 67 years) with 292 renal tumors underwent LRFA (112) or CTRFA (180). Mean tumor size was 2.5 cm (0.7-5.3 cm). An intraoperative preablation biopsy showed 197 (67.4%) renal-cell carcinomas (RCC), and 77 (26.4%) benign tumors. Mean follow-up was 26 months (1-98 mos). The single ablation treatment radiographic success rate was 96% for all tumors and 94% for RCC. Metastatic RCC developed in one patient, who died. The Kaplan-Meier (KM) 3-year and 5-year cancer-specific survival was 100% and 98.6%, respectively. The KM 3-year and 5-year overall survival was 90.4% and 74.2%, respectively. CONCLUSION: RFA is a clinically effective and safe nephron-sparing treatment of patients with small renal masses. Our large cohort and intermediate-term experience adds to the building evidence for the efficacy of RFA for small renal cancers.
Assuntos
Ablação por Cateter/métodos , Sistemas Computacionais , Neoplasias Renais/cirurgia , Termometria/métodos , Adolescente , Adulto , Idoso , Idoso de 80 Anos ou mais , Ablação por Cateter/efeitos adversos , Demografia , Feminino , Humanos , Cuidados Intraoperatórios , Estimativa de Kaplan-Meier , Neoplasias Renais/diagnóstico por imagem , Neoplasias Renais/patologia , Laparoscopia , Masculino , Pessoa de Meia-Idade , Recidiva Local de Neoplasia/patologia , Complicações Pós-Operatórias/etiologia , Tomografia Computadorizada por Raios X , Resultado do Tratamento , Adulto JovemRESUMO
PURPOSE: To provide a clinical framework for the diagnosis and treatment of interstitial cystitis/bladder pain syndrome. MATERIALS AND METHODS: A systematic review of the literature using the MEDLINE® database (search dates 1/1/83-7/22/09) was conducted to identify peer reviewed publications relevant to the diagnosis and treatment of interstitial cystitis/bladder pain syndrome. Insufficient evidence-based data were retrieved regarding diagnosis and, therefore, this portion of the Guideline is based on Clinical Principles and Expert Opinion statements. The review yielded an evidence base of 86 treatment articles after application of inclusion/exclusion criteria. These publications were used to create the majority of the treatment portion of the Guideline. When sufficient evidence existed, the body of evidence for a particular treatment was assigned a strength rating of A (high), B (moderate) or C (low). Additional treatment information is provided as Clinical Principles and Expert Opinion when insufficient evidence existed. See text and algorithm for definitions, and detailed diagnostic management, and treatment frameworks. RESULTS: The evidence-based guideline statements are provided for diagnosis and overall management of interstitial cystitis/bladder pain syndrome as well as for various treatments. The panel identified first through sixth line treatments as well as developed guideline statements on treatments that should not be offered. CONCLUSIONS: Interstitial cystitis/bladder pain syndrome is best identified and managed through use of a logical algorithm such as is presented in this Guideline. In the algorithm the panel identifies an overall management strategy for the interstitial cystitis/bladder pain syndrome patient. Diagnosis and treatment methodologies can be expected to change as the evidence base grows in the future.
Assuntos
Cistite Intersticial/diagnóstico , Cistite Intersticial/terapia , HumanosRESUMO
Oleamide (cis-9-octadecenamide) is a member of an emerging class of lipid-signaling molecules, the primary fatty acid amides. A growing body of evidence indicates that oleamide mediates fundamental neurochemical processes including sleep, thermoregulation, and nociception. Nevertheless, the mechanism for oleamide biosynthesis remains unknown. The leading hypothesis holds that oleamide is synthesized from oleoylglycine via the actions of the peptide amidating enzyme, peptidylglycine alpha-amidating monooxygenase (PAM). The present study investigated this hypothesis using pharmacologic treatments, physiologic assessments, and measurements of serum oleamide levels using a newly developed enzyme-linked immunosorbant assay (ELISA). Oleamide and oleoylglycine both induced profound hypothermia and decreased locomotion, over equivalent dose ranges and time courses, whereas, closely related compounds, stearamide and oleic acid, were essentially without effect. While the biologic actions of oleamide and oleoylglycine were equivalent, the two compounds differed dramatically with respect to their effects on serum levels of oleamide. Oleamide administration (80mg/kg) elevated blood-borne oleamide by eight-fold, whereas, the same dose of oleoylglycine had no effect on circulating oleamide levels. In addition, pretreatment with the established PAM inhibitor, disulfiram, produced modest reductions in the hypothermic responses to both oleoylglycine and oleamide, suggesting that the effects of disulfiram were not mediated through inhibition of PAM and a resulting decrease in the formation of oleamide from oleoylglycine. Collectively, these findings raise the possibilities that: (1) oleoylglycine possesses biologic activity that is independent of its conversion to oleamide and (2) the increased availability of oleoylglycine as a potential substrate does not drive the biosynthesis of oleamide.
Assuntos
Depressores do Sistema Nervoso Central/farmacologia , Glicina/análogos & derivados , Hipotermia/metabolismo , Atividade Motora/efeitos dos fármacos , Ácidos Oleicos/sangue , Ácidos Oleicos/farmacologia , Animais , Depressores do Sistema Nervoso Central/administração & dosagem , Depressores do Sistema Nervoso Central/síntese química , Relação Dose-Resposta a Droga , Ensaio de Imunoadsorção Enzimática , Glicina/administração & dosagem , Glicina/síntese química , Glicina/farmacologia , Hipotermia/induzido quimicamente , Masculino , Atividade Motora/fisiologia , Ácidos Oleicos/administração & dosagem , Ácidos Oleicos/síntese química , Ratos , Ratos Sprague-Dawley , Fatores de TempoRESUMO
The Reactive Irritability Scale (RIS) uses magnitude estimation to measure reactive irritability. Respondents rate target sounds in comparison to a neutral reference sound. The RIS proved more sensitive than self-report measures to detect irritability associated with withdrawal from cigarette smoking and with exposure to a stressful environment, but was too long (30 min) for routine use. We report here on a shortened version (13 min)--RIS-II. The RIS-II exhibited robust test-retest reliability and correlated strongly with the original RIS (Study 1). In Study 2, the RIS-II was administered to subjects who experienced psychological stress and then were exposed to progressive relaxation, music, cognitive tasks, or silence; the Progressive Relaxation group was the most irritable. In Study 3, the RIS-II was administered to chronic pain patients. Pain patients found the sounds less irritating than did controls with the exception of the reference sound; repeated presentation of the reference sound increased irritability. These studies indicate that the RIS-II is a reliable instrument that may have utility for the measurement of irritability in laboratory and clinical settings. In addition, these studies indicate that the RIS-II is understandable by individuals of different ages who are from educationally- and culturally-diverse backgrounds and individuals who are healthy as well as individuals suffering from chronic medical conditions who are on multiple medications.
Assuntos
Humor Irritável , Dor/psicologia , Inquéritos e Questionários , Adolescente , Adulto , Idoso , Demografia , Feminino , Frequência Cardíaca/fisiologia , Humanos , Masculino , Pessoa de Meia-Idade , Psicofísica , Reprodutibilidade dos Testes , Estatísticas não Paramétricas , Percepção VisualRESUMO
More than 90% of cigarette smokers begin smoking during adolescence. This between-subjects repeated-measures experiment examined: (1) nicotine's acute effects on activity in adolescent and adult female Sprague-Dawley rats (Drug Phase I); (2) the effects of age of initial nicotine exposure on activity when nicotine was not administered (Interim Phase); and (3) the effects of age of initial nicotine exposure on later responses to nicotine (Drug Phase II). The experiment consisted of three separate phases. In Drug Phase I, animals were administered either 0 (saline), 0.01, 0.10, 0.50, or 1.0 mg/kg nicotine via subcutaneous injections for 12 days and horizontal activity was measured daily. During the Interim Phase (no drug phase), activity was measured but nicotine was not administered. During Drug Phase II, the same animals were administered the same nicotine dosages as in Drug Phase I for 12 days and activity was measured daily. Drug Phase I revealed dose-response differences between adolescent and adult female rats. In addition, animals initially exposed to nicotine in adolescence exhibited greater sensitivity to nicotine's activity-increasing effects than did females initially exposed to nicotine in adulthood (i.e., Drug Phase II).
Assuntos
Envelhecimento/psicologia , Atividade Motora/efeitos dos fármacos , Nicotina/farmacologia , Agonistas Nicotínicos/farmacologia , Análise de Variância , Animais , Relação Dose-Resposta a Droga , Ciclo Estral/fisiologia , Feminino , Ratos , Ratos Sprague-DawleyRESUMO
Gender and genotype result in differential sensitivity to stress and to nicotine. Male and female Sprague-Dawley and Long-Evans rats exhibit different behavioral responses to immobilization stress and to chronically-administered nicotine, suggesting that these animals may be useful to model human variability in stress and nicotine sensitivity. It is possible that differences in sensitivity of the hypothalamo-pituitary-adrenocortical (HPA) axis might account for these sex and strain differences. This experiment examined corticosterone (CORT) and adrenocorticotropin hormone (ACTH) responses of male and female Sprague-Dawley (n=117) and Long-Evans (n=120) rats administered 0, 6, or 12 mg/kg/day nicotine for 14 days; half of each treatment group was exposed to immobilization stress (20 min/day). Feeding and body weight also were measured. Nicotine increased CORT and ACTH levels of Sprague-Dawley females only. Stress increased CORT and ACTH levels of all groups except for Long-Evans females. Nicotine and stress decreased feeding and body weight with greatest effects in Long-Evans females. CORT, feeding, and body weight were positively correlated among stressed females. These findings suggest that strain differences in HPA axis, body weight, and feeding responses to nicotine and to stress are robust among females but not among males. CORT reactivity and female sex hormones may explain these differences.
Assuntos
Corticosteroides/sangue , Peso Corporal/fisiologia , Comportamento Alimentar/fisiologia , Sistema Hipotálamo-Hipofisário/fisiologia , Hormônios Hipofisários/sangue , Sistema Hipófise-Suprarrenal/fisiologia , Estresse Psicológico/fisiopatologia , Estresse Psicológico/psicologia , Hormônio Adrenocorticotrópico/sangue , Animais , Corticosterona/sangue , Ingestão de Alimentos/fisiologia , Feminino , Genótipo , Masculino , Nicotina/farmacologia , Agonistas Nicotínicos/farmacologia , Ratos , Ratos Long-Evans , Ratos Sprague-Dawley , Restrição Física , Caracteres Sexuais , Especificidade da EspécieRESUMO
Over 4500 adolescents start smoking every day in the United States. Of these, one-third will die prematurely from smoking-related diseases. The current experiment examined the effects of repeated-acute nicotine administration (saline, 0.1, 0.5, or 1.0 mg/kg daily) on elevated plus maze (EPM) and locomotor behaviors of 160 adolescent and adult male and female Sprague-Dawley rats. Nicotine's effects depended on age and sex of animal. On the EPM, nicotine exerted anxiolytic effects (increased percentage of time in the open arms) in adolescent males, but exerted anxiogenic effects (decreased percentage of time in the open arms) in adolescent females and in adult males and females. For adults, peak locomotor activity occurred at the 0.5-mg/kg dosage, and the 1.0-mg/kg dosage reduced activity below the saline level on Day 1 and below the 0.5-mg/kg level on Days 1, 3, and 5. For adolescents, peak locomotor activity occurred at the 1.0-mg/kg dosage and there were no activity-depressant effects. These findings suggest there are age differences in sensitivity to nicotine that may affect vulnerability to long-term tobacco use.
Assuntos
Aprendizagem em Labirinto/efeitos dos fármacos , Atividade Motora/efeitos dos fármacos , Nicotina/farmacologia , Caracteres Sexuais , Animais , Relação Dose-Resposta a Droga , Feminino , Masculino , Aprendizagem em Labirinto/fisiologia , Atividade Motora/fisiologia , Ratos , Ratos Sprague-DawleyRESUMO
The adverse effects of tobacco smoking on the cardiovascular system are well established. Effects of nicotine on the heart, in contrast, are not well characterized. Understanding specific effects of nicotine on the heart and on blood volume is relevant to (a) elucidating the mechanisms by which nicotine may contribute to heart disease and (b) determining potential risks associated with nicotine products used in smoking cessation or to treat various medical conditions. The present experiment investigated effects of continuous nicotine administration for 14 days (0, 6, or 12 mg/kg/day) on heart histopathology and blood volume (a measure of hemoconcentration) in 59 male and 59 female rats of two strains (Sprague-Dawley and Long-Evans). Following nicotine administration, animals were sacrificed and blood volume was measured. Heart length; heart weight; left ventricle, right ventricle, lateral wall, anterior wall, and posterior wall thicknesses; and intraventricular width (i.e., septum) were measured. Nicotine reduced heart weight, heart length, and overall blood volume. Females were more sensitive than males to the effects of nicotine on heart weight. In contrast, males were more sensitive than females to the effects of nicotine on heart length. Together, these findings suggest that males and females differ in their sensitivity to nicotine's cardiac effects.
Assuntos
Volume Sanguíneo/efeitos dos fármacos , Estimulantes Ganglionares/efeitos adversos , Coração/anatomia & histologia , Nicotina/efeitos adversos , Fumar/efeitos adversos , Animais , Modelos Animais de Doenças , Feminino , Coração/efeitos dos fármacos , Masculino , Ratos , Ratos Long-Evans , Ratos Sprague-DawleyRESUMO
More than 90% of cigarette smokers begin smoking during adolescence, suggesting that adolescents may be particularly vulnerable to nicotine's effects. This experiment examined: (1) nicotine's acute effects on locomotion in adolescent and adult male Sprague-Dawley rats (Drug Phase I); (2) the effects of age of initial nicotine exposure on locomotion when nicotine was not administered (Interim Phase); and (3) the effects of age of initial nicotine exposure on later responses to nicotine (Drug Phase II). In Drug Phase I, animals were administered 0, 0.01, 0.10, 0.50, or 1.0 mg/kg nicotine sc for 12 days and horizontal activity was measured daily. During the Interim Phase, activity was measured but nicotine was not administered. During Drug Phase II, animals were administered the same nicotine dosages as in Drug Phase I for 12 days, and activity was measured daily. Drug Phase I revealed dose-response differences between adolescents and adults such that adolescents exhibited peak activity at both the 0.50- and 1.0-mg/kg dosages, but adults exhibited peak activity at the 0.50-mg/kg dosage. Initial nicotine exposure in adolescence (0.50 and 1.0 mg/kg), but not in adulthood, resulted in hyperactivity in adulthood in the absence of nicotine (Interim Phase). Reexposure to nicotine when all animals were adults (Drug Phase II) revealed that initial nicotine exposure in adolescence compared to adulthood resulted in dose-response differences in adulthood similar to those in Drug Phase I. In addition, animals initially exposed in adolescence exhibited sensitization to nicotine's activity-increasing effects in adulthood. These findings suggest that there are age differences in nicotine sensitivity that could predispose individuals initially exposed to nicotine in adolescence to long-term smoking.
Assuntos
Tolerância a Medicamentos/fisiologia , Atividade Motora/efeitos dos fármacos , Atividade Motora/fisiologia , Nicotina/administração & dosagem , Fatores Etários , Animais , Masculino , Ratos , Ratos Sprague-DawleyRESUMO
Locomotor activity is widely used to study nicotine effects, including genotypic differences, in rodents. In rats, chronic nicotine's (administered via osmotic minipump) effects on locomotion may differ based on animal strain, with Long-Evans rats more sensitive than Sprague-Dawley rats. Males and females also may differ in sensitivity. No studies, however, have compared males and females of the two strains. In addition, stress relief is a frequently cited reason for smoking, but the behavioral consequences of nicotine-stress interactions have rarely been examined. This experiment evaluated locomotor responses of male and female Sprague-Dawley and Long-Evans rats to 0, 6, or 12 mg/kg/day nicotine administered by minipump. Half of the animals in each drug condition were exposed to 20 min/day of immobilization stress to examine nicotine-stress interactions. Horizontal and vertical activities were measured on Drug Days 4 and 10. Stress effects were minimal and stress did not alter effects of nicotine. Nicotine (6 mg/kg/day) increased horizontal activity among Long-Evans but not among Sprague-Dawleys, with greater effects in Long-Evans females. Nicotine (6 mg/kg/day) increased vertical activity of all groups and 12 mg/kg/day decreased vertical activity of all groups except for Sprague-Dawley males. Results indicate that genotype and sex are relevant to understand nicotine's behavioral actions.