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1.
J Adv Nurs ; 80(3): 1018-1029, 2024 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-37828729

RESUMO

AIM: To explain the process taken by Chinese family care partners of older adults in the Greater Toronto Area, Canada, to access health and social services in their communities. The research question was: What mechanisms and structures impact the agency of Chinese family care partners of older adults, in the process of assisting them to access health and social services? DESIGN: This qualitative study was informed by critical realism. METHODS: Chinese family care partners of older adults in the Greater Toronto Area, Canada, were interviewed from August 2020 to June 2021. Transcripts underwent thematic analysis. FINDINGS: Twenty-eight Chinese family care partners expressed a firm commitment to maintain caregiving conditions and to judiciously access health and social services. Their commitment was made up of three parts: (a) legislative and cultural norms of family, work, and society; (b) their perseverance to fill gaps with limited social and financial resources; (c) the quality of their relationship to, and illness trajectory of the older adults. The social structures created tension in how Chinese family care partners made decisions, negotiated resources, and ultimately monitored and coordinated timely access with older adults. CONCLUSION: Participants' commitment and perseverance were conceptualized as "grit," central to their agency to conform to legislative and cultural norms. Moreover, findings support grit's power to motivate and sustain family caregiving, in order for older adults to age in place as long as possible with finite resources. IMPLICATIONS FOR THE PROFESSION: This study highlights the importance of cultural awareness education for nurses, enabling continuity of care at a systems level and for a more resilient healthcare system. IMPACT: Family care partners' grit may be crucial for nurses to harness when together, they face limited access to culturally appropriate health and social services in a system grounded in values of equity and inclusion, as in Canada. REPORTING METHOD: When writing this manuscript, we adhered to relevant EQUATOR guidelines of the Consolidated Criteria for Reporting Qualitative Research (COREQ). PATIENT OR PUBLIC INVOLVEMENT AND ENGAGEMENT: No patient or public involvement.


Assuntos
Povo Asiático , Cuidadores , Acessibilidade aos Serviços de Saúde , Aceitação pelo Paciente de Cuidados de Saúde , Idoso , Humanos , Povo Asiático/psicologia , Canadá/epidemiologia , Cuidadores/psicologia , China/etnologia , Pesquisa Qualitativa , Aceitação pelo Paciente de Cuidados de Saúde/etnologia , Aceitação pelo Paciente de Cuidados de Saúde/psicologia , Intenção , Ontário/epidemiologia , Acessibilidade aos Serviços de Saúde/estatística & dados numéricos
4.
Calcif Tissue Int ; 113(2): 195-206, 2023 08.
Artigo em Inglês | MEDLINE | ID: mdl-37367955

RESUMO

Physical capacity (PC) and physical activity (PA) are associated physical performance measures, and combined, PC and PA are used to categorize physical performance in the "can do, do do" framework. We aimed to explore physical performance of patients attending the fracture liaison service (FLS). In this cross-sectional study, PC was measured by 6-min-walking-test (can't do/can do) and PA by accelerometer (don't do/do do). Following quadrants were defined based on predefined cut-off scores for poor performance: (1) "can't do, don't do"; (2) "can do, don't do"; (3) "can't do, do do"; (4) "can do, do do". Odds ratios (OR) were calculated and fall and fracture risk factors were assessed between quadrants. Physical performance of 400 fracture patients was assessed (mean age 64; female 70.8%). Patients performed as follows: 8.3% "can't do, don't do"; 3.0% "can do, don't do"; 19.3% "can't do, do do"; 69.5% "can do, do do". For the "can't do" group the OR for low PA was 9.76 (95% CI: 4.82-19.80). Both the "can't do, don't do" and "can't do, do do" group differed significantly compared to the "can do, do do" group on several fall and fracture risk factors and had lower physical performance. The "can do, do do" framework is able to identify fracture patients with an impaired physical performance. Of all FLS patients 20% "can't do, but "do do" while having a high prevalence of fall risk factors compared to persons that "can do, do do", which may indicate this group is prone to fall.


Assuntos
Exercício Físico , Humanos , Feminino , Pessoa de Meia-Idade , Estudos Transversais
6.
J Urol ; 209(3): 540-548, 2023 03.
Artigo em Inglês | MEDLINE | ID: mdl-36475730

RESUMO

PURPOSE: Active surveillance is widely used to manage low-risk prostate cancer, but population-level long-term outcomes are limited. Our objective was to determine long-term population-level oncological outcomes in active surveillance patients. A secondary objective examined the active surveillance discontinuation rate. MATERIALS AND METHODS: In this retrospective, population-based study using linked administrative databases from Ontario, Canada, we identified low-grade prostate cancer patients managed with active surveillance or initial treatment between 2002-2014. The 10- and 15-year metastasis-free survival, overall survival, and cancer-specific survival were compared between active surveillance and initial treatment. A landmark of 24 months was selected for the primary analysis. Long-term outcomes were examined using multivariable proportional hazards models and a propensity-based approach. RESULTS: The cohort consisted of 21,282 low-grade prostate cancer patients with a median follow-up of 9.8 years. At 10-year follow-up the survival rate of remaining on active surveillance was 39%, metastasis-free survival was 94.2%, overall survival 88.7%, and cancer-specific survival 98.1%. In adjusted models active surveillance was associated with higher risk of metastasis (HR 1.34, 95%CI 1.15-1.57), overall mortality (HR 1.12, 95%CI 1.01-1.24), and prostate cancer-specific mortality (HR 1.66, 95%CI 1.15-2.39) compared to initial treatment. Survival analysis using 7,525 propensity-matched pairs was consistent with the primary analysis for metastasis-free survival, overall survival and cancer-specific survival. CONCLUSIONS: In this large population-based study of long-term outcomes in men with low-grade prostate cancer, active surveillance is associated with excellent long-term metastasis-free survival and overall survival. However, long-term cancer-specific survival was slightly inferior (1% worse at 10 years with active surveillance), and this must be balanced against known harms of overtreatment.


Assuntos
Neoplasias da Próstata , Conduta Expectante , Masculino , Humanos , Estudos Retrospectivos , Próstata/patologia , Neoplasias da Próstata/patologia , Antígeno Prostático Específico , Ontário/epidemiologia , Gradação de Tumores
8.
Urology ; 164: 118-123, 2022 06.
Artigo em Inglês | MEDLINE | ID: mdl-35182588

RESUMO

OBJECTIVE: To compare the odds of early and prolonged post-operative opioid use in patients undergoing minimally invasive surgery (MIS) vs open surgery for nephrectomy. METHODS: For opioid-naïve patients in Ontario who underwent nephrectomy for kidney cancer (1994-2017, n = 7900), post-discharge opioid use was determined by prescriptions in the Ontario Drug Benefit database (age ≥65 years) and the Narcotics Monitoring System (all patients from 2012). Early opioid use was defined as ≥1 prescription 1-90 days after surgery. Two separate definitions of prolonged opioid use were examined: (1) prescription(s) for ≥60 days during post-operative days 90-365; (2) ≥1 prescriptions between both of: 1-90 days AND 91-180 days after surgery. Predictors of opioid use were assessed using multivariable generalized estimating equation logistic regression, accounting for surgeon clustering. RESULTS: Overall, 67.4% of patients received early opioid prescriptions; however, prolonged use was low, ranging from 1.6 to 4.4% of patients depending on the definition. In multivariable analysis, open nephrectomy was associated with higher odds of early opioid use compared to MIS nephrectomy (Odds Ratio [OR] 1.36, 95% Confidence Interval [CI] 1.19-1.55). Surgery type was not significantly associated with prolonged opioid use for either definition (OR 1.22, CI 0.79-1.89 and OR 1.06, CI 0.83-1.35). CONCLUSIONS: In this population-level study of patients undergoing nephrectomy for kidney cancer, patients who received open surgery were at increased odds of receiving early post-operative opioids compared to MIS. Prolonged opioid use was low overall and was not significantly with associated with type of surgery.


Assuntos
Neoplasias Renais , Transtornos Relacionados ao Uso de Opioides , Assistência ao Convalescente , Idoso , Analgésicos Opioides/uso terapêutico , Prescrições de Medicamentos , Humanos , Neoplasias Renais/tratamento farmacológico , Neoplasias Renais/cirurgia , Nefrectomia , Ontário/epidemiologia , Dor Pós-Operatória/tratamento farmacológico , Dor Pós-Operatória/epidemiologia , Alta do Paciente , Estudos Retrospectivos , Fatores de Risco
9.
J Urol ; 206(4): 903-913, 2021 10.
Artigo em Inglês | MEDLINE | ID: mdl-34412510

RESUMO

PURPOSE: The purpose of this study was to describe the uptake, discontinuation and variation of active surveillance (AS) by provider and patient level characteristics. MATERIALS AND METHODS: This observational, population-based study used linked administrative databases and pathology reports to identify all men diagnosed with Gleason score ≤6 prostate cancer (PC) between January 1, 2008 and December 31, 2014 in Ontario, Canada. The Cochran-Armitage test was used for AS trend over time. Treatment-free survival was estimated using cumulative incidence function. Factors associated with discontinuation of AS were evaluated using Cox proportional hazard models. RESULTS: Active surveillance was the initial management strategy for 8,541 cases (51%). Use of AS significantly increased from 38% in 2008 to 69% in 2014 (p=0.001). Men on AS were significantly older (64 years, SD 8.0) than those on initial treatment (62 years, SD 7.7; p=0.001). After a median followup of 48 months, 4,337 (51%) patients had discontinued AS. Treatment-free survival for AS patients at 1, 3, and 5 years were 85%, 58% and 52%, respectively. Median time to definitive treatment after initial AS was 16 months (IQR 11-25 months). Factors associated with AS discontinuation were younger age at diagnosis, year of diagnosis, higher comorbidities, treatment at academic center, treatment by physician and institution in the highest volume tertile, and adverse cancer-specific characteristics (higher prostate specific antigen [PSA], higher number of positive cores and higher percentage of core involvement at diagnosis). CONCLUSIONS: Although the uptake of AS significantly increased over time, there has been a relatively high rate of discontinuation over 5 years. Factors associated with transition to definitive treatment were younger age, care provided by higher volume physicians and institutions, higher PSA and greater PC volume at diagnosis. These results may help guide policy making, developing quality indicators, and developing targeted continued education for physician and patients embarking on AS to establish realistic expectations.


Assuntos
Prostatectomia/estatística & dados numéricos , Neoplasias da Próstata/terapia , Conduta Expectante/estatística & dados numéricos , Fatores Etários , Idoso , Idoso de 80 Anos ou mais , Progressão da Doença , Humanos , Calicreínas/sangue , Masculino , Pessoa de Meia-Idade , Gradação de Tumores , Ontário/epidemiologia , Intervalo Livre de Progressão , Próstata/patologia , Próstata/cirurgia , Antígeno Prostático Específico/sangue , Neoplasias da Próstata/sangue , Neoplasias da Próstata/diagnóstico , Neoplasias da Próstata/mortalidade
11.
J Urol ; 206(4): 933-941, 2021 10.
Artigo em Inglês | MEDLINE | ID: mdl-34032504

RESUMO

PURPOSE: Phase-III randomized control trial evidence suggests intermittent androgen deprivation therapy (IADT) is not significantly inferior to continuous androgen deprivation therapy (ADT) for patients with prostate cancer (PC). However, clinical practice and guidelines differ in their recommendations. We evaluate real-world utilization and practice patterns of IADT. MATERIALS AND METHODS: Ontario men ≥65 years of age with PC who initiated ADT for ≥3 months were identified (1997-2017). Lapses in ADT ≥6 months (initial gap) and ≥3 months (subsequent gaps) were used to classify IADT. Neoadjuvant/adjuvant therapy was excluded. Disease stage adjustment was completed for patients with likely metastatic disease based on de novo presentation with ADT. Patient and physician predictors of IADT were analyzed using multivariable logistic regression. RESULTS: We identified 8,544 patients with 1,715 having previously received local therapy. Among all patients, 16.4% received IADT. This ranged from 11.4%-24.8% across health-planning regions and increased to 26.6% in those with previous local therapy. Mean followup was 8.3 years. Patients with prior local therapy (OR 1.85, 95% CI 1.59-2.17, p <0.001) and those in the highest income quintile (OR 1.32, 95% CI 1.08-1.60, p=0.005) had increased odds of receiving IADT. Radiation oncologists were more likely to use IADT than urologists (OR 1.99, 95% CI 1.59-2.50, p <0.001), as were physicians with more experience (≥10 years in practice: OR 1.44, 95% CI 1.11-1.88, p=0.007). In specialty-stratified analyses, case volume was significantly associated with IADT for radiation oncologists (highest quartile: OR 1.73, 95% CI 1.14-2.62, p=0.009). CONCLUSIONS: IADT remains underutilized for patients with PC who ≥65 years of age with only 1 in 4 to 1 in 6 eligible patients receiving this form of care. Clinical, sociodemographic and physician characteristics play an important role in treatment selection.


Assuntos
Antagonistas de Androgênios/uso terapêutico , Antineoplásicos Hormonais/uso terapêutico , Padrões de Prática Médica/estatística & dados numéricos , Neoplasias da Próstata/tratamento farmacológico , Fatores Etários , Idoso , Idoso de 80 Anos ou mais , Esquema de Medicação , Seguimentos , Humanos , Renda/estatística & dados numéricos , Masculino , Estadiamento de Neoplasias , Ontário/epidemiologia , Seleção de Pacientes , Guias de Prática Clínica como Assunto , Padrões de Prática Médica/normas , Neoplasias da Próstata/diagnóstico , Neoplasias da Próstata/mortalidade , Neoplasias da Próstata/patologia , Radio-Oncologistas/estatística & dados numéricos , Análise de Sobrevida , Resultado do Tratamento , Urologistas/estatística & dados numéricos
12.
BMC Public Health ; 21(1): 307, 2021 02 06.
Artigo em Inglês | MEDLINE | ID: mdl-33549071

RESUMO

BACKGROUND: Polytobacco product use is increasingly popular, but little is known about the prevalence, trend, and factors of such use particularly in non-western countries. METHOD: A representative sample of 1139 current cigarette smokers aged 15+ (84.1% male) were telephone interviewed in Tobacco Control Policy-related Surveys in 2015-2017. Information collected included poly-tobacco use (PTU), smoking and socio-demographic characteristics. Associations of current PTU with related factors were analyzed using logistic regression with adjustment for confounders. Prevalence was weighted by age and sex of current cigarette users in the general population. RESULTS: Eighty-four point one percent (95% CI 81.4-86.6%) were exclusive cigarette smokers. Fifteen point nine percent (13.4-18.6%) were current polytobacco product users, 12.3% (10.2-14.8%) used one tobacco product and 2.52% (1.59-3.97%) used two tobacco products in addition to cigarette. Cigarette use with cigar was more common (6.28%, 4.75-8.27%), and the least used product with cigarette was e-cigarette (1.05%, 0.44-2.50%). The changes in overall prevalence of PTU by number of products use varied in 3 years. Current PTU was associated with being male (AOR 2.01, 95% CI 1.12-3.61), younger age (AORs range from 1.34-4.65, P for trend < .001) and less ready to quit (2.08, 1.09-3.97). CONCLUSIONS: Prevalence of PTU increased slowly by year, one tobacco product use with cigarette was more common. The most used tobacco product with cigarette was cigar. Being male, younger and less ready to quit were associated with current PTU.


Assuntos
Sistemas Eletrônicos de Liberação de Nicotina , Produtos do Tabaco , Adolescente , China/epidemiologia , Feminino , Hong Kong/epidemiologia , Humanos , Masculino , Fumantes , Uso de Tabaco/epidemiologia
13.
Int Nurs Rev ; 67(4): 484-494, 2020 Dec.
Artigo em Inglês | MEDLINE | ID: mdl-32869285

RESUMO

AIM: The purpose of this paper is to report on the evaluation of the online Global Leadership Mentoring Community, a programme designed to build relationships across seven global regions and promote leadership development for emerging nurse leaders. BACKGROUND: There is a pressing need and opportunity for sustainable global leadership mentoring programmes. This programme of Sigma Theta Tau International (Sigma) brought mentors and mentees together from across the world to build leadership capacity, understand global leadership issues and build networks. Community coordinators purposively selected mentors from each of Sigma's seven Global Regions, and mentees were chosen through a process of snowball sampling. Mentors and mentees met monthly with quarterly group calls. METHODS: The study followed a programme evaluation, outcomes-focused approach. All eleven pairs of mentors-mentees were invited to complete online surveys at the outset and end of programme capturing both quantitative and qualitative data. Quantitative data were analysed using descriptive statistics and for qualitative data, a thematic analysis. FINDINGS: Quantitative data confirmed that all 22 participants gained from the experience. From qualitative analysis, themes emerged illustrating the scope of achievements: 1. facilitation of successful outcomes for both mentors and mentees, 2. challenges of global mentoring and 3. strategies for successful global mentoring. DISCUSSION/CONCLUSION: Participants reported that creating global leadership is a longitudinal process that needs sustained attention to effect change. This evaluation identified many strengths of the programme and recommended its continuation to help further development of global leaders, particularly through focusing more purposefully on policy issues. IMPLICATIONS FOR NURSING POLICY: Empowerment of nurses globally through a Global Leadership Mentoring Community can improve leadership at all levels, thus emboldening their voices to influence nursing and health policy and ultimately improve patient care.


Assuntos
Tutoria , Fortalecimento Institucional , Humanos , Liderança , Mentores , Avaliação de Programas e Projetos de Saúde
14.
East Asian Arch Psychiatry ; 29(2): 63-65, 2019 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-31237248

RESUMO

On 25 to 26 August 2017, the 'Compulsory Mental Health Treatment in Hong Kong: Which Way Forward?' conference was held in Hong Kong. Academics and practitioners from the United Kingdom, United States, New Zealand, and Hong Kong came together to discuss such important topics as the philosophical justifications for compulsory treatment, constitutional and human rights, and how compulsory powers are and should be used in practice. Speakers and conference participants then engaged in roundtable discussions on various issues that arose, in particular how reform of the law regulating compulsory mental health treatment in Hong Kong should proceed.


Assuntos
Tratamento Psiquiátrico Involuntário , Transtornos Mentais/terapia , Congressos como Assunto , Hong Kong , Humanos , Tratamento Psiquiátrico Involuntário/ética , Tratamento Psiquiátrico Involuntário/métodos , Saúde Mental/ética , Saúde Mental/normas
16.
J Perinatol ; 35(7): 464-8, 2015 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-25719544

RESUMO

BACKGROUND: If an infant fails to initiate spontaneous breathing after birth, international guidelines recommend a positive pressure ventilation (PPV). However, PPV by face mask is frequently inadequate because of leak between the face and mask. Despite a variety of available face masks, none have been prospectively compared in a randomized fashion. We aimed to evaluate and compare leak between two commercially available round face masks (Fisher & Paykel (F&P) and Laerdal) in preterm infants <33 weeks gestational age in the delivery room. METHODS: Infants born at the Royal Alexandra Hospital from April to September 2013 at <33 weeks gestational age who received mask PPV in the delivery room routinely had a flow sensor placed between the mask and T-piece resuscitator. Infants were randomly assigned to receive PPV with either a F&P or Laerdal face mask. All resuscitators were trained in the use of both face masks. We compared mask leak, airway pressures, tidal volume and ventilation rate between the two groups. RESULTS: Fifty-six preterm infants (n=28 in each group) were enrolled; mean±s.d. gestational age 28±3 weeks; birth weight 1210±448 g; and 30 (52%) were male. Apgar scores at 1 and 5 min were 5±3 and 7±2, respectively. Infants randomized to the F&P face mask and Laerdal face mask had similar mask leak (30 (25-38) versus 35 (24-46)%, median (interquartile range), respectively, P=0.40) and tidal volume (7.1 (4.9-8.9) versus 6.6 (5.2-8.9) ml kg(-1), P=0.69) during PPV. There were no significant differences in ventilation rate, inflation time or airway pressures between groups. CONCLUSION: The use of either face mask during PPV in the delivery room yields similar mask leak in preterm infants <33 weeks gestational age.


Assuntos
Recém-Nascido Prematuro , Máscaras , Respiração com Pressão Positiva/instrumentação , Desenho de Equipamento , Feminino , Frequência Cardíaca , Humanos , Recém-Nascido , Recém-Nascido Prematuro/fisiologia , Doenças do Prematuro/epidemiologia , Masculino , Oxigênio/sangue , Ressuscitação/métodos
17.
Allergy ; 70(2): 171-9, 2015 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-25377909

RESUMO

BACKGROUND: Several studies have demonstrated the time course of inflammatory mediators in nasal fluids following nasal allergen challenge (NAC), whereas the effects of NAC on cells in the periphery are unknown. We examined the time course of effector cell markers (for basophils, dendritic cells and T cells) in peripheral blood after nasal grass pollen allergen challenge. METHODS: Twelve participants with seasonal allergic rhinitis underwent a control (diluent) challenge followed by NAC after an interval of 14 days. Nasal symptoms and peak nasal inspiratory flow (PNIF) were recorded along with peripheral basophil, T-cell and dendritic cell responses (flow cytometry), T-cell proliferative responses (thymidine incorporation), and cytokine expression (FluoroSpot assay). RESULTS: Robust increases in nasal symptoms and decreases in PNIF were observed during the early (0-1 h) response and modest significant changes during the late (1-24 h) response. Sequential peaks in peripheral blood basophil activation markers were observed (CD107a at 3 h, CD63 at 6 h, and CD203c(bright) at 24 h). T effector/memory cells (CD4(+) CD25(lo) ) were increased at 6 h and accompanied by increases in CD80(+) and CD86(+) plasmacytoid dendritic cells (pDCs). Ex vivo grass antigen-driven T-cell proliferative responses and the frequency of IL-4(+) CD4(+) T cells were significantly increased at 6 h after NAC when compared to the control day. CONCLUSION: Basophil, T-cell, and dendritic cell activation increased the frequency of allergen-driven IL-4(+) CD4(+) T cells, and T-cell proliferative responses are detectable in the periphery after NAC. These data confirm systemic cellular activation following a local nasal provocation.


Assuntos
Alérgenos/imunologia , Poaceae/imunologia , Pólen/imunologia , Rinite Alérgica Sazonal/imunologia , Adulto , Idoso , Basófilos/imunologia , Basófilos/metabolismo , Contagem de Linfócito CD4 , Linfócitos T CD4-Positivos/imunologia , Linfócitos T CD4-Positivos/metabolismo , Células Dendríticas/imunologia , Células Dendríticas/metabolismo , Feminino , Humanos , Imunoglobulina E/sangue , Imunoglobulina E/imunologia , Interleucina-4/metabolismo , Ativação Linfocitária/imunologia , Masculino , Pessoa de Meia-Idade , Testes de Provocação Nasal , Testes de Função Respiratória , Rinite Alérgica Sazonal/diagnóstico , Rinite Alérgica Sazonal/metabolismo , Índice de Gravidade de Doença , Testes Cutâneos , Adulto Jovem
18.
Transfus Med ; 24(5): 269-73, 2014 Oct.
Artigo em Inglês | MEDLINE | ID: mdl-25066199

RESUMO

BACKGROUND AND OBJECTIVES: Blood transfusion is a frequent medical intervention in hospitals. The benefits of, risks of and alternatives to blood transfusions are not consistently understood by patients. The objective of this study was to assess gaps in knowledge and comfort with the current process of consenting patients for blood transfusions. A standardised video regarding the risk and benefits of blood transfusions was developed and feedback regarding this tool was assessed. METHODS: After informed consent had been obtained, 25 patients receiving their first transfusion at a single academic centre were asked to complete a survey, watch a standardised educational video and complete a follow-up survey. RESULTS: The patient survey revealed that the information recollected from informed consent discussions was variable and incomplete. After the informed consent discussion, the majority of patients were comfortable with having a blood transfusion, although one-third did express concerns or worry about having a blood transfusion. After viewing the video, patients felt that the video improved their understanding of the risks (7·3 of 10), benefits (6·9 of 10) and alternatives (7·1 of 10) to transfusion, but it did not change their comfort with blood transfusion consent. CONCLUSION: Patients experienced a variable informed consent process prior to blood transfusion. Although the video improved their understanding of risks, it did not improve patient comfort towards giving consent for transfusion as the level of comfort was already high. The video is available online (http://www.youtube.com/watch?v=RxaPnLkgh-0) as an optional resource for patients (and physicians) who wish to receive standardised and accurate information about blood transfusions.


Assuntos
Transfusão de Sangue , Aceitação pelo Paciente de Cuidados de Saúde , Educação de Pacientes como Assunto/métodos , Inquéritos e Questionários , Adulto , Idoso , Idoso de 80 Anos ou mais , Feminino , Seguimentos , Humanos , Masculino , Pessoa de Meia-Idade , Ontário , Risco
19.
Phytomedicine ; 21(4): 391-9, 2014 Mar 15.
Artigo em Inglês | MEDLINE | ID: mdl-24192211

RESUMO

Danshen and Gegen are two commonly used Chinese herbal medicines for treatment of cardiovascular diseases. The aim of the present study was to elucidate the combination effects of these two herbs on cerebral vascular tone and their underlying mechanisms of actions. Basilar artery rings were obtained from rats and precontracted with U46619. Cumulative administrations of aqueous extracts of Danshen, Gegen, or the two herbs combined (DG; ratio 7:3) produced concentration-dependent relaxation of the artery rings. Statistical analysis on these findings produced a combination index (CI) of 1.041 at ED50, which indicates the two herbs produced additive vasodilator effects when used as a combined decoction. Removal of the endothelium had no effect on the vasodilator properties of Danshen, Gegen, and DG. However, their maximum effects (Imax) were significantly blunted by a KATP channel inhibitor glibenclamide, a non-selective K(+) channel inhibitor tetraethylammonium (TEA), and by a combination of K(+) channel inhibitors (glibenclamide+TEA+iberiotoxin+4-aminopyridine+barium chloride). In addition, Danshen, Gegen, and DG produced augmentation of KATP currents and inhibited Ca(2+) influx in vascular smooth muscle cells isolated from rat basilar arteries. Furthermore, these agents inhibited CaCl2-induced contraction in the artery rings. In conclusion, the present study showed that Danshen and Gegen produced additive vasodilator effects on rat cerebral basilar arteries. These effects were independent of endothelium-derived relaxant factors (EDRF), but required the opening of KATP channels and inhibition of Ca(2+) influx in the vascular smooth muscle cells. It is suspected that the cerebral vasodilator effects of Danshen and Gegen produced either on their own or in combination, can help patients with obstructive cerebrovascular diseases.


Assuntos
Artéria Basilar/efeitos dos fármacos , Medicamentos de Ervas Chinesas/farmacologia , Vasodilatação/efeitos dos fármacos , Ácido 15-Hidroxi-11 alfa,9 alfa-(epoximetano)prosta-5,13-dienoico , Animais , Canais de Cálcio/efeitos dos fármacos , Endotélio Vascular/efeitos dos fármacos , Canais KATP/efeitos dos fármacos , Microscopia Confocal , Pueraria , Ratos , Salvia miltiorrhiza
20.
J Ethnopharmacol ; 137(3): 1366-72, 2011 Oct 11.
Artigo em Inglês | MEDLINE | ID: mdl-21855622

RESUMO

ETHNOPHARMACOLOGICAL RELEVANCE: Radix Salviae miltiorrhizae (Danshen) and Radix Puerariae lobatae (Gegen) have long been used in traditional Chinese Medicine and serve as the principal herbs in treating cardiovascular disease. AIMS OF THE STUDY: In the present study, an aqueous extract comprising Danshen and Gegen in the ratio of 7:3 (DG) was investigated for its anti-hypertension in vivo and vasodilative activities ex vivo. MATERIALS AND METHODS: The anti-hypertensive effect of DG extract was investigated in spontaneously hypertensive rat (SHR) by measuring systolic blood pressure (SBP). Oral administration of DG extract was started at age of 6 weeks and 14 weeks for the preventive and therapeutic studies, respectively. Blood pressure was measured by tail-cuff method biweekly for 12 weeks. The ex vivo vasodilative activities of DG extract, its dependency on endothelium and the involvement of nitric oxide, prostacyclin and potassium channels were investigated using isolated rat aorta ring in organ bath. RESULTS: For in vivo study, systolic blood pressure was significantly reduced in DG extract-treated groups (90.2 and 300 mg/kg) as compared with the SHR control in both preventive and therapeutic studies. However, DG extract was unable to suppress or delay the onset of hypertension in the preventive study. For ex vivo study, the results showed that DG extract induced a concentration-dependent relaxation in aorta and persisted response was observed with the removal of endothelium. Besides, pretreatment with a non-selective potassium channel inhibitor tetraethylammonium (TEA) also significantly inhibited DG extract-induced vasodilation. Further investigations on specific potassium channel blockers revealed that ATP-sensitive potassium (K(ATP)) channel inhibitor glibenclamide, inward rectifier potassium (Kir) inhibitor barium chloride and voltage-dependent potassium (K(v)) channel inhibitor 4-aminopyridine, but not BK(Ca) channel inhibitor iberiotoxin, exerted significant inhibition on DG extract-induced vasodilation. CONCLUSIONS: The results of in vivo SHR animal model suggested that DG aqueous extract possessed blood pressure lowering effect on both pre- and post-hypertensive rats, which could be explained by its endothelium-independent vasodilation via the opening of K(ATP), Kir and K(v) channels.


Assuntos
Anti-Hipertensivos/farmacologia , Aorta Torácica/efeitos dos fármacos , Pressão Sanguínea/efeitos dos fármacos , Medicamentos de Ervas Chinesas/farmacologia , Hipertensão/tratamento farmacológico , Pueraria , Salvia miltiorrhiza , Vasodilatação/efeitos dos fármacos , Vasodilatadores/farmacologia , Administração Oral , Animais , Anti-Hipertensivos/administração & dosagem , Anti-Hipertensivos/isolamento & purificação , Aorta Torácica/metabolismo , Aorta Torácica/fisiopatologia , Modelos Animais de Doenças , Relação Dose-Resposta a Droga , Medicamentos de Ervas Chinesas/administração & dosagem , Medicamentos de Ervas Chinesas/isolamento & purificação , Epoprostenol/metabolismo , Hipertensão/metabolismo , Hipertensão/fisiopatologia , Hipertensão/prevenção & controle , Canais KATP/efeitos dos fármacos , Canais KATP/metabolismo , Masculino , Óxido Nítrico/metabolismo , Plantas Medicinais , Bloqueadores dos Canais de Potássio/farmacologia , Canais de Potássio Corretores do Fluxo de Internalização/efeitos dos fármacos , Canais de Potássio Corretores do Fluxo de Internalização/metabolismo , Canais de Potássio de Abertura Dependente da Tensão da Membrana/efeitos dos fármacos , Canais de Potássio de Abertura Dependente da Tensão da Membrana/metabolismo , Pueraria/química , Ratos , Ratos Endogâmicos SHR , Ratos Endogâmicos WKY , Ratos Sprague-Dawley , Salvia miltiorrhiza/química , Fatores de Tempo , Vasodilatadores/administração & dosagem , Vasodilatadores/isolamento & purificação
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