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1.
BMC Cancer ; 22(1): 847, 2022 Aug 03.
Artículo en Inglés | MEDLINE | ID: mdl-35922767

RESUMEN

BACKGROUND: While cancer outcomes have improved over time, in Northern Ireland they continue to lag behind those of many other developed economies. The role of comorbid conditions has been suggested as a potential contributory factor in this but issues of data comparability across jurisdictions has inhibited efforts to explore relationships. We use data from a single jurisdiction of the UK using data from - the Northern Ireland Cancer Registry (NICR), to examine the association between mortality (all-cause and cancer specific) and pre-existing cardiovascular diseases among patients with cancer. MATERIALS AND METHODS: All patients diagnosed with cancer (excluding non-melanoma skin cancer) between 2011 and 2014 were identified from Registry records. Those with a pre-existing diagnosis of cardiovascular diseases were identified by record linkage with patient hospital discharge data using ICD10 codes. Survival following diagnosis was examined using descriptive statistics and Cox proportional hazards regression analyses. Analyses examined all-cause mortality and cancer specific mortality for lung, colorectal, breast and prostate cancer. As well as cardiovascular diseases, regression models controlled for age, gender (where appropriate), deprivation (as quintiles), stage at diagnosis and other comorbidities. RESULTS: Almost 35,000 incident cancer cases were diagnosed during the study period of which approximately 23% had a prior heart condition. The pan-cancer hazard ratio for death in the presence of pre-existing cardiovascular diseases was 1.28 (95% CI: 1.18-1.40). All-cause and cancer specific mortality was higher for patients with cardiovascular diseases across lung, female breast, prostate and colorectal cancer groups after controlling for age, gender (where appropriate), deprivation (as quintiles), stage at diagnosis and other comorbidities. CONCLUSION: Pre-existing morbidity may restrict the treatment of cancer for many patients. In this cohort, cancer patients with pre-existing cardiovascular diseases had poorer outcomes than those without cardiovascular diseases. A high prevalence of cardiovascular diseases may contribute to poorer cancer outcomes at a national level.


Asunto(s)
Enfermedades Cardiovasculares , Cardiopatías , Neoplasias de la Próstata , Enfermedades Cardiovasculares/complicaciones , Enfermedades Cardiovasculares/epidemiología , Estudios de Cohortes , Cardiopatías/complicaciones , Cardiopatías/epidemiología , Humanos , Masculino , Modelos de Riesgos Proporcionales , Neoplasias de la Próstata/complicaciones
2.
Epidemiology ; 31(3): 432-440, 2020 05.
Artículo en Inglés | MEDLINE | ID: mdl-31651660

RESUMEN

BACKGROUND: Androgen deprivation therapy (ADT), with a proven role in prostate cancer management, has been associated with various cardiovascular diseases. However, few studies have investigated these associations by type of ADT, particularly for newer ADTs such as the gonadotropin-releasing hormone (GnRH) antagonist degarelix. We investigated the risk of cardiovascular disease by type of ADT in a real-world setting. METHODS: We identified men newly diagnosed with prostate cancer, from 2009 to 2015, from the Scottish Cancer Registry and ADTs from the nationwide Prescribing Information System. Cardiovascular events were based upon hospitalization (from hospital records) or death from cardiovascular disease (from death records). We used Cox regression to calculate hazard ratios (HRs) and 95% confidence intervals (CIs) for cardiovascular events with time-varying ADT exposure, comparing ADT users with untreated patients, after adjusting for potential confounders, including prior cardiovascular disease. RESULTS: The cohort contained 20,216 prostate cancer patients, followed for 73,570 person-years, during which there were 3,853 cardiovascular events. ADT was associated with a 30% increase in cardiovascular events (adjusted HR = 1.3; 95% CI = 1.2, 1.4). This reflected increases in cardiovascular events associated with GnRH agonists (adjusted HR = 1.3; 95% CI = 1.2, 1.4), degarelix (adjusted HR = 1.5; 95% CI = 1.2, 1.9), but not bicalutamide monotherapy (adjusted HR = 1.0; 95% CI = 0.82, 1.3). CONCLUSIONS: There were increased risks of cardiovascular disease with the use of GnRH agonists and degarelix, but not with bicalutamide monotherapy. This is the first study to observe increased cardiovascular risks with degarelix, but the cause of this association is unclear and merits further investigation.


Asunto(s)
Antagonistas de Andrógenos , Enfermedades Cardiovasculares , Neoplasias de la Próstata , Antagonistas de Andrógenos/efectos adversos , Antagonistas de Andrógenos/uso terapéutico , Enfermedades Cardiovasculares/epidemiología , Humanos , Masculino , Neoplasias de la Próstata/tratamiento farmacológico , Neoplasias de la Próstata/epidemiología , Riesgo
3.
BMC Nephrol ; 21(1): 37, 2020 01 31.
Artículo en Inglés | MEDLINE | ID: mdl-32005180

RESUMEN

BACKGROUND: Tissue derived biomarkers may offer utility as indicators of accumulated damage. Reduced thickness of retinal neuronal tissue and the vascular choroid have previously been associated with vascular damage and diabetes. We evaluated associations between retinal thickness, retinal microvascular and choroidal measures, and renal function in a population with a high burden of comorbidity. METHODS: Participants were recruited from nuclear cardiology or renal medicine clinics. Retinal and choroidal thickness were measured from spectral-domain optical coherence tomograms. Retinal microvascular parameters were assessed from digital fundus photographs using a semi-automated software package. MAIN OUTCOME MEASURE: Chronic kidney disease (CKD) categorised as: CKD stages 1-2, eGFR ≥60 ml/min/1.73m2; CKD stage 3, eGFR 30-59 ml/min/1.73m2, and CKD stages 4-5, eGFR ≤29 ml/min/1.73m2. RESULTS: Participants (n = 241) had a mean age of 65 years and a mean eGFR of 66.9 ml/min/1.73m2. Thirty-nine % of the cohort had diabetes and 27% were using diuretics. Thinning of the inner retina and changes to its microvascular blood supply were associated with lower eGFR and CKD stages 4 and 5, while no associations were found between the outer retinal layers or their choroidal blood supply and CKD of any stage. These associations remained following adjustment for age, mean arterial blood pressure, diabetes status, low-density lipoprotein, body mass index, and sex. CONCLUSIONS: Inner retinal thinning and retinal microvascular variation is associated with advanced CKD (stages 4 & 5) independent of important confounding factors, but not with earlier stage CKD (stage 3) and, therefore, its utility as a biomarker for early CKD is not supported in this study.


Asunto(s)
Coroides/patología , Microvasos/patología , Insuficiencia Renal Crónica/fisiopatología , Retina/patología , Vasos Retinianos/patología , Anciano , Biomarcadores , Coroides/diagnóstico por imagen , Femenino , Tasa de Filtración Glomerular , Humanos , Fallo Renal Crónico/fisiopatología , Masculino , Microvasos/diagnóstico por imagen , Persona de Mediana Edad , Oftalmoscopía , Tamaño de los Órganos , Fotograbar , Retina/diagnóstico por imagen , Vasos Retinianos/diagnóstico por imagen , Tomografía de Coherencia Óptica
4.
J Cardiovasc Nurs ; 32(2): 148-155, 2017.
Artículo en Inglés | MEDLINE | ID: mdl-26829748

RESUMEN

BACKGROUND: Observational studies suggest that patients with heart failure have a tendency to a reduced status of a number of micronutrients and that this may be associated with an adverse prognosis. A small number of studies also suggest that patients with heart failure may have reduced dietary intake of micronutrients, a possible mechanism for reduced status. OBJECTIVE: The aims of this study were to assess dietary micronutrient intake and micronutrient status in a group of patients with heart failure. METHODS: Dietary intake was assessed in 79 outpatients with chronic stable heart failure with a reduced ejection fraction using a validated food frequency questionnaire. Blood concentrations of a number of micronutrients, including vitamin D, were measured in fasting blood samples, drawn at the time of food frequency questionnaire completion. RESULTS: More than 20% of patients reported intakes less than the reference nutrient intake or recommended intake for riboflavin, vitamin D, vitamin A, calcium, magnesium, potassium, zinc, copper, selenium, and iodine. More than 5% of patients reported intakes less than the lower reference nutrient intake or minimum recommended intake for riboflavin, vitamin D, vitamin A, calcium, magnesium, potassium, zinc, selenium, and iodine. Vitamin D deficiency (plasma total 25-hydroxy-vitamin D concentration <50 nmol/L) was observed in 75.6% of patients. CONCLUSIONS: Vitamin D deficiency was common in this group of patients with heart failure. Based on self-reported dietary intake, a substantial number of individuals may not have been consuming enough vitamin D and a modest number of individuals may not have been consuming enough riboflavin, vitamin A, calcium, magnesium, potassium, zinc, copper, selenium, or iodine to meet their dietary needs.


Asunto(s)
Ingestión de Energía , Insuficiencia Cardíaca/complicaciones , Micronutrientes , Estado Nutricional , Deficiencia de Vitamina D/epidemiología , Anciano , Enfermedad Crónica , Femenino , Insuficiencia Cardíaca/psicología , Humanos , Masculino , Persona de Mediana Edad , Autoinforme
5.
Palliat Med ; 29(4): 310-23, 2015 Apr.
Artículo en Inglés | MEDLINE | ID: mdl-25239128

RESUMEN

BACKGROUND: Individualised care at the end of life requires professional understanding of the patient's perception of implantable cardioverter defibrillator deactivation. AIM: The aim was to evaluate the evidence on patients' perception of implantable cardioverter defibrillator deactivation at end of life. DESIGN: Systematic narrative review of empirical studies was published during 2008-2014. DATA SOURCES: Data were collected from six databases, citations from relevant articles and expert recommendations. RESULTS: In all, 18 studies included with collective population of n = 5810. Concept mapping highlighted three themes: (1) Diverse preferences regarding discussion and deactivation. Deactivation was rarely discussed pre-implantation, with some studies demonstrating patients' reluctance to discuss implantable cardioverter defibrillator deactivation at any stage. Two studies found the majority of patients valued such discussions. Diversity was reflected in patients' willingness to deactivate, ranging from 12% (n = 9) in Irish cohort to 79% (n = 195) in Dutch study. (2) Ethical and legal considerations were predominant in Canadian and American literature as patients wanted to contribute but felt the decision should be a doctor's responsibility. Advance directives were uncommon in Europe, and where they existed the implantable cardioverter defibrillator was not mentioned. (3) 'Living in the now' was evident as despite deteriorating symptoms many patients maintained a positive outlook and anticipated surviving more than 10 years. Several studies asserted living longer was more important than quality of life. CONCLUSION: Patients regard the implantable cardioverter defibrillator as a complex and solely beneficial device, with little insight regarding its potential impact on a peaceful death. This review confirms the need for professionals to discuss with patients and families implantable cardioverter defibrillator functionality and deactivation at appropriate opportunities.


Asunto(s)
Actitud Frente a la Salud , Desfibriladores Implantables , Cuidado Terminal , Comunicación , Investigación Empírica , Humanos , Prioridad del Paciente , Percepción , Relaciones Médico-Paciente , Calidad de Vida
6.
Cardiovasc Ultrasound ; 13: 12, 2015 Mar 20.
Artículo en Inglés | MEDLINE | ID: mdl-25888961

RESUMEN

BACKGROUND: The identification of pre-clinical microvascular damage in hypertension by non-invasive techniques has proved frustrating for clinicians. This proof of concept study investigated whether entropy, a novel summary measure for characterizing blood velocity waveforms, is altered in participants with hypertension and may therefore be useful in risk stratification. METHODS: Doppler ultrasound waveforms were obtained from the carotid and retrobulbar circulation in 42 participants with uncomplicated grade 1 hypertension (mean systolic/diastolic blood pressure (BP) 142/92 mmHg), and 26 healthy controls (mean systolic/diastolic BP 116/69 mmHg). Mean wavelet entropy was derived from flow-velocity data and compared with traditional haemodynamic measures of microvascular function, namely the resistive and pulsatility indices. RESULTS: Entropy, was significantly higher in control participants in the central retinal artery (CRA) (differential mean 0.11 (standard error 0.05 cms(-1)), CI 0.009 to 0.219, p 0.017) and ophthalmic artery (0.12 (0.05), CI 0.004 to 0.215, p 0.04). In comparison, the resistive index (0.12 (0.05), CI 0.005 to 0.226, p 0.029) and pulsatility index (0.96 (0.38), CI 0.19 to 1.72, p 0.015) showed significant differences between groups in the CRA alone. Regression analysis indicated that entropy was significantly influenced by age and systolic blood pressure (r values 0.4-0.6). None of the measures were significantly altered in the larger conduit vessel. CONCLUSION: This is the first application of entropy to human blood velocity waveform analysis and shows that this new technique has the ability to discriminate health from early hypertensive disease, thereby promoting the early identification of cardiovascular disease in a young hypertensive population. CLINICAL TRIAL REGISTRATION: Clinical Trials.gov, NCT01047423.


Asunto(s)
Arterias Carótidas/diagnóstico por imagen , Enfermedades de las Arterias Carótidas/diagnóstico por imagen , Enfermedades de las Arterias Carótidas/etiología , Hipertensión/diagnóstico por imagen , Hipertensión/etiología , Ultrasonografía/métodos , Adulto , Algoritmos , Entropía , Femenino , Humanos , Aumento de la Imagen/métodos , Interpretación de Imagen Asistida por Computador/métodos , Masculino , Persona de Mediana Edad , Reconocimiento de Normas Patrones Automatizadas/métodos , Reproducibilidad de los Resultados , Sensibilidad y Especificidad , Análisis de Ondículas
7.
BMC Med Educ ; 15: 96, 2015 Jun 02.
Artículo en Inglés | MEDLINE | ID: mdl-26031890

RESUMEN

BACKGROUND: Although the General Medical Council recommends that United Kingdom medical students are taught 'whole person medicine', spiritual care is variably recognised within the curriculum. Data on teaching delivery and attainment of learning outcomes is lacking. This study ascertained views of Faculty and students about spiritual care and how to teach and assess competence in delivering such care. METHODS: A questionnaire comprising 28 questions exploring attitudes to whole person medicine, spirituality and illness, and training of healthcare staff in providing spiritual care was designed using a five-point Likert scale. Free text comments were studied by thematic analysis. The questionnaire was distributed to 1300 students and 106 Faculty at Queen's University Belfast Medical School. RESULTS: 351 responses (54 staff, 287 students; 25 %) were obtained. >90 % agreed that whole person medicine included physical, psychological and social components; 60 % supported inclusion of a spiritual component within the definition. Most supported availability of spiritual interventions for patients, including access to chaplains (71 %), counsellors (62 %), or members of the patient's faith community (59 %). 90 % felt that personal faith/spirituality was important to some patients and 60 % agreed that this influenced health. However 80 % felt that doctors should never/rarely share their own spiritual beliefs with patients and 67 % felt they should only do so when specifically invited. Most supported including training on provision of spiritual care within the curriculum; 40-50 % felt this should be optional and 40 % mandatory. Small group teaching was the favoured delivery method. 64 % felt that teaching should not be assessed, but among assessment methods, reflective portfolios were most favoured (30 %). Students tended to hold more polarised viewpoints but generally were more favourably disposed towards spiritual care than Faculty. Respecting patients' values and beliefs and the need for guidance in provision of spiritual care were identified in the free-text comments. CONCLUSIONS: Students and Faculty generally recognise a spiritual dimension to health and support provision of spiritual care to appropriate patients. There is lack of consensus whether this should be delivered by doctors or left to others. Spiritual issues impacting patient management should be included in the curriculum; agreement is lacking about how to deliver and assess.


Asunto(s)
Actitud del Personal de Salud , Curriculum , Educación de Pregrado en Medicina , Salud Holística/educación , Espiritualidad , Adulto , Docentes Médicos , Femenino , Humanos , Masculino , Modelos Educacionales , Estudiantes de Medicina/psicología , Encuestas y Cuestionarios , Reino Unido , Adulto Joven
8.
Front Med (Lausanne) ; 11: 1382903, 2024.
Artículo en Inglés | MEDLINE | ID: mdl-38808142

RESUMEN

Introduction: Teaching professionalism is a fundamental aspect of medical undergraduate education, delivering important domains of professional attitudes, ethics, and behaviors. The effects of educational interventions can be assessed by measuring the change in such domains, but validated assessment tools for these professionalism domains are lacking. In this study, we constructed and conducted expert validation of a modified theory of planned behavior (TPB) questionnaire to assess changes in professional behaviors (PBs) in medical students. Methods: To validate that, we modified an existing TPB questionnaire, and an 18-item questionnaire was subjected to expert panel evaluation using the content validation method. The clarity and relevance of items were assessed using a four-point rating scale (i.e., 1 = not relevant to 4 = highly relevant). Ratings of experts and free-text comments were analyzed. Quantitative evaluation of relevance and clarity was undertaken through analyses of the Item-level Content Validity Index (I-CVI) and Scale-level Content Validity Index (S-CVI). A qualitative assessment of the comments of experts was conducted to refine items, any disagreements were discussed, and a consensus decision was developed among authors for item changes. Results: Quantitative evaluation of the Item-level Content Validity Index (I-CVI) scored 0.9-1 for relevance and 0.7-1 for clarity. Qualitative evaluation resulted in (i) changes to the wording of items (e.g., choices such as "worthless/worthwhile" were replaced with "not important/important"); and (ii) suggestion of the addition of social media in the construct of subjective norms. Discussion: The proposed tool exhibits content validity and can assess TPB constructs in professionalism education. This study of content validity may help to ensure the modified TPB questionnaire accurately measures the TPB constructs, ensuring its effectiveness in accurately measuring the TPB constructs for PB in diversified educational medical institutions.

9.
Cardiol Ther ; 12(2): 227-241, 2023 Jun.
Artículo en Inglés | MEDLINE | ID: mdl-36757637

RESUMEN

Cancer and cardiovascular disease are two of the leading causes of global mortality and morbidity. Medical research has generated powerful lifesaving treatments for patients with cancer; however, such treatments may sometimes be at the expense of the patient's myocardium, leading to heart failure. Anti-cancer drugs, including anthracyclines, can result in deleterious cardiac effects, significantly impacting patients' functional capacity, mental well-being, and quality of life. Recognizing this, recent international guidelines and expert papers published recommendations on risk stratification and care delivery, including that of cardio-oncology services. This review will summarize key evidence with a focus on anthracycline therapy, providing clinical guidance for the non-oncology professional caring for a patient with cancer and heart failure.

10.
Cardiovasc Res ; 119(3): 710-728, 2023 05 02.
Artículo en Inglés | MEDLINE | ID: mdl-35640873

RESUMEN

Cancer therapeutics-related cardiac dysfunction (CTRCD) has emerged as a major cause of morbidity and mortality in cancer survivors. Effective clinical management of CTRCD is impeded by a lack of sensitive diagnostic and prognostic strategies. Circulating molecular markers could potentially address this need as they are often indicative of cardiac stress before cardiac damage can be detected clinically. A growing understanding of the underlying physiological mechanisms for CTRCD has inspired research efforts to identify novel pathophysiologically relevant biomarkers that may also guide development of cardio-protective therapeutic approaches. The purpose of this review is to evaluate current circulating biomarkers of cardiac stress and their potential role in diagnosis and management of CTRCD. We also discuss some emerging avenues for CTRCD-focused biomarker investigations.


Asunto(s)
Antineoplásicos , Cardiopatías , Neoplasias , Humanos , Antineoplásicos/efectos adversos , Cardiotoxicidad/tratamiento farmacológico , Cardiopatías/inducido químicamente , Cardiopatías/diagnóstico , Cardiopatías/terapia , Biomarcadores , Ecocardiografía , Neoplasias/diagnóstico , Neoplasias/tratamiento farmacológico
11.
Radiother Oncol ; 186: 109762, 2023 09.
Artículo en Inglés | MEDLINE | ID: mdl-37348608

RESUMEN

INTRODUCTION: Radiation cardiotoxicity is a dose-limiting toxicity and major survivorship issue for patients with non-small cell lung cancer (NSCLC) completing curative-intent radiotherapy, however patients' cardiovascular baseline is not routinely optimised prior to treatment. In this study we examined the impact of statin therapy on overall survival and post-radiotherapy cardiac events. METHODS: Patients treated between 2015-2020 at a regional center were identified. Clinical notes were interrogated for baseline patient, tumor and cardiac details, and both follow-up cancer control and cardiac events. Three cardiologists verified cardiac events. Radiotherapy planning scans were retrieved for application of validated deep learning-based autosegmentation. Pre-specified Cox regression analyses were generated with varying degrees of adjustment for overall survival. Fine and Gray regression for the risk of cardiac events, accounting for the competing risk of death and cardiac covariables was undertaken. RESULTS: Statin therapy was prescribed to 59% of the 478 included patients. The majority (88%) of patients not prescribed a statin had at least one indication for statin therapy according to cardiovascular guidelines. In total, 340 patients (71%) died and 79 patients (17%) experienced a cardiac event. High-intensity (HR 0.68, 95%CI 0.50-0.91, p = 0.012) and medium-intensity (HR 0.70, 95%CI 0.51-0.97, p = 0.033) statin therapy were associated with improved overall survival after adjustment for patient, cancer, treatment, response and cardiovascular clinical factors. There were no consistent differences in the rate or grade of cardiac events according to statin intensity. CONCLUSIONS: Statin therapy is associated with improved overall survival in patients receiving curative-intent radiotherapy for NSCLC, and there is evidence of a dose-response relationship. This study highlights the importance of a pre-treatment cardiovascular risk assessment in this cohort. Further studies are needed to examine if statin therapy is cardioprotective in patients undergoing treatment for NSCLC with considerable incidental cardiac radiation dose and a low baseline cardiac risk.


Asunto(s)
Carcinoma de Pulmón de Células no Pequeñas , Inhibidores de Hidroximetilglutaril-CoA Reductasas , Neoplasias Pulmonares , Humanos , Carcinoma de Pulmón de Células no Pequeñas/tratamiento farmacológico , Carcinoma de Pulmón de Células no Pequeñas/radioterapia , Inhibidores de Hidroximetilglutaril-CoA Reductasas/efectos adversos , Cardiotoxicidad/etiología , Neoplasias Pulmonares/tratamiento farmacológico , Neoplasias Pulmonares/radioterapia , Corazón , Estudios Retrospectivos
12.
J Physiol ; 590(5): 1181-97, 2012 Mar 01.
Artículo en Inglés | MEDLINE | ID: mdl-22183724

RESUMEN

Intermedin (IMD) protects rodent heart and vasculature from oxidative stress and ischaemia. Less is known about distribution of IMD and its receptors and the potential for similar protection in man. Expression of IMD and receptor components were studied in human aortic endothelium cells (HAECs), smooth muscle cells (HASMCs), cardiac microvascular endothelium cells (HMVECs) and fibroblasts (v-HCFs). Receptor subtype involvement in protection by IMD against injury by hydrogen peroxide (H2O2, 1 mmol l⁻¹) and simulated ischaemia and reperfusion were investigated using receptor component-specific siRNAs. IMD and CRLR, RAMP1, RAMP2 and RAMP3 were expressed in all cell types.When cells were treated with 1 nmol l⁻¹ IMD during exposure to 1 mmol l⁻¹ H2O2 for 4 h, viability was greater vs. H2O2 alone (P<0.05 for all cell types). Viabilities under 6 h simulated ischaemia differed (P<0.05) in the absence and presence of 1 nmol l⁻¹ IMD: HAECs 63% and 85%; HMVECs 51% and 68%; v-HCFs 42% and 96%. IMD 1 nmol l⁻¹ present throughout ischaemia (3 h) and reperfusion (1 h) attenuated injury (P<0.05): viabilities were 95%, 74% and 82% for HAECs, HMVECs and v-HCFs, respectively, relative to those in the absence of IMD (62%, 35%, 32%, respectively). When IMD 1 nmol l⁻¹ was present during reperfusion only, protection was still evident (P<0.05, 79%, 55%, 48%, respectively). Cytoskeletal disruption and protein carbonyl formation followed similar patterns. Pre-treatment (4 days) of HAECs with CRLR or RAMP2, but not RAMP1 or RAMP3, siRNAs abolished protection by IMD (1 nmol l⁻¹) against ischaemia-reperfusion injury. IMD protects human vascular and cardiac non-vascular cells from oxidative stress and ischaemia-reperfusion,predominantly via AM1 receptors.


Asunto(s)
Hormonas Peptídicas/fisiología , Receptores de Adrenomedulina/fisiología , Daño por Reperfusión/fisiopatología , Adulto , Aorta/citología , Péptido Relacionado con Gen de Calcitonina/fisiología , Células Cultivadas , Células Endoteliales/fisiología , Endotelio Vascular/citología , Fibroblastos/fisiología , Humanos , Miocardio/citología , Miocitos del Músculo Liso/fisiología , ARN Mensajero/metabolismo , ARN Interferente Pequeño/genética , Proteínas Modificadoras de la Actividad de Receptores/fisiología , Transfección
13.
Microcirculation ; 18(7): 532-40, 2011 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-21554488

RESUMEN

OBJECTIVE: Waveform analysis has been used to assess vascular resistance and predict cardiovascular events. We aimed to identify microvascular abnormalities in patients with IGT using ocular waveform analysis. The effects of pioglitazone were also assessed. METHODS: Forty patients with IGT and 24 controls were studied. Doppler velocity recordings were obtained from the central retinal, ophthalmic, and common carotid arteries, and sampled at 200 Hz. A discrete wavelet-based analysis method was employed to quantify waveforms. The RI was also determined. Patients with IGT were randomized to pioglitazone or placebo, and measurements were repeated after 12-week treatment. RESULTS: In the ocular waveforms, significant differences in power spectra were observed in frequency band 4 (corresponding to frequencies between 6.25 and 12.50 Hz) between groups (p < 0.05). No differences in RI occurred. No association was observed between waveform parameters and fasting glucose or insulin resistance. Pioglitazone had no effect on waveform structure, despite significantly reducing insulin resistance, fasting glucose, and triglycerides (p < 0.05). CONCLUSIONS: Analysis of ocular Doppler flow waveforms using the discrete wavelet transform identified microvascular abnormalities that were not apparent using RI. Pioglitazone improved glucose, insulin sensitivity, and triglycerides without influencing the contour of the waveforms.


Asunto(s)
Ojo , Hipoglucemiantes/administración & dosificación , Resistencia a la Insulina , Microcirculación/efectos de los fármacos , Microvasos/anomalías , Microvasos/fisiopatología , Tiazolidinedionas/administración & dosificación , Adulto , Anciano , Glucemia/metabolismo , Ojo/irrigación sanguínea , Ojo/fisiopatología , Ayuno , Femenino , Humanos , Masculino , Persona de Mediana Edad , Pioglitazona
14.
Clin Sci (Lond) ; 121(3): 129-39, 2011 Aug.
Artículo en Inglés | MEDLINE | ID: mdl-21345174

RESUMEN

Impaired FMD (flow-mediated dilatation) has traditionally been recognized as an indirect marker of NO bioactivity, occurring in disease states such as DM (diabetes mellitus). Endothelium-dependent FMD is a homoeostatic response to short-term increases in local shear stress. Microvascular dysfunction in DM influences blood flow velocity patterns. We explored the determinants of the FMD response in relation to evoked DSS (diastolic shear stress) and forearm microcirculation haemodynamics by quantifying changes in Doppler flow velocity waveforms between groups. Forty patients with uncomplicated Type 1 DM and 32 controls underwent B-mode and Doppler ultrasound scanning to interrogate the brachial artery. Postischaemic Doppler velocity spectral envelopes were recorded and a wavelet-based time-frequency spectral analysis method was employed to track change in distal microcirculatory haemodynamics. No difference in baseline brachial artery diameter was evident between the groups (4.15 compared with 3.94 mm, P=0.23). FMD was significantly impaired in patients with Type 1 DM (3.95 compared with 7.75%, P<0.001). Endothelium-independent dilatation in response to GTN (glyceryl trinitrate) was also significantly impaired (12.07 compared with 18.77%, P<0.001). DSS (dyn/cm2) was significantly reduced in the patient group (mean 20.19 compared with 29.5, P=0.001). Wavelet interrogation of postischaemic flow velocity waveforms identified significant differences between groups. In conclusion, DSS, microcirculatory function and endothelium-independent vasodilatation in response to GTN are important determinants that impact on the magnitude of FMD response and are impaired in patients with Type 1 DM. Impaired FMD response is multifactorial in origin and cannot be attributed solely to a diminished NO bioavailability.


Asunto(s)
Diabetes Mellitus Tipo 1/sangre , Diabetes Mellitus Tipo 1/patología , Microcirculación , Adulto , Velocidad del Flujo Sanguíneo , Presión Sanguínea , Enfermedades Cardiovasculares/patología , Estudios de Casos y Controles , Electrocardiografía/métodos , Femenino , Frecuencia Cardíaca , Humanos , Masculino , Persona de Mediana Edad , Nitroglicerina/farmacología , Resistencia al Corte , Estrés Mecánico
15.
Cardiovasc Drugs Ther ; 25(1): 99-104, 2011 Feb.
Artículo en Inglés | MEDLINE | ID: mdl-21136284

RESUMEN

HMG Co-A reductase inhibitors (statins) are a group of drugs which lower cholesterol by inhibiting the conversion of HMG Co-A to mevalonate early in the cholesterol synthetic pathway. They are used in the primary and secondary prevention of cardiovascular events in patients deemed to be at increased risk and their benefit in patients with ischaemic heart disease is well supported. Their use in patients with heart failure (HF) however, is controversial. Evidence from observational and mechanistic studies suggests that statins should benefit patients with HF. However, larger randomised controlled trials have failed to demonstrate these expected benefits. The aim of this review article is to summarise the data from trials of statin use in patients with HF and attempt to explain the apparent conflict between recent placebo controlled trials and earlier observational and mechanistic studies.


Asunto(s)
Insuficiencia Cardíaca/tratamiento farmacológico , Inhibidores de Hidroximetilglutaril-CoA Reductasas/efectos adversos , Inhibidores de Hidroximetilglutaril-CoA Reductasas/uso terapéutico , Animales , Ensayos Clínicos como Asunto , Humanos , Ensayos Clínicos Controlados Aleatorios como Asunto
16.
J Electrocardiol ; 44(4): 432-8, 2011.
Artículo en Inglés | MEDLINE | ID: mdl-21529821

RESUMEN

UNLABELLED: Of patients who present with ischemic-type chest pain and a negative cardiac troponin T (cTnT) at first medical contact, there are patients at a very early stage of infarction. The aim of this research was to assess heart fatty acid-binding protein (H-FABP), a novel marker of myocyte necrosis, in combination with the 80-lead body surface potential map (BSPM) in the early diagnosis of acute myocardial infarction (AMI). METHODS: In this prospective study, consecutive patients presenting with acute ischemic-type chest pain between 2003 and 2006 were enrolled. At first medical contact, blood was sampled for cTnT and H-FABP; in addition, a 12-lead electrocardiogram (ECG) and BSPM were recorded. A second cTnT was sampled 12 hours or more after presentation. Peak cTnT 0.03 µg/L or higher diagnosed AMI. Elevated H-FABP was 5 ng/mL or higher. A cardiologist blinded to both the clinical details and 12-lead ECG interpreted the BSPM. RESULTS: Enrolled were 407 patients (age 62 ± 13 years; 70% men). Of these 407, 180 had cTnT less than 0.03 µg/L at presentation. Acute myocardial infarction occurred in 52 (29%) of 180 patients. Of these 180 patients, 27 had ST-segment elevation (STE) on ECG, 104 had STE on BSPM (sensitivity, 88%; specificity, 55%), and 95 (53%) had H-FABP elevation. The proportion with elevated H-FABP was higher in the AMI group compared with non-AMI group (P < .001). Body surface potential map STE was significantly associated with H-FABP elevation (P < .001). Of those with initial cTnT less than 0.03 µg/L, the c-statistic for the receiver operating characteristic curve distinguishing AMI from non-AMI using H-FABP alone was 0.644 (95% confidence interval [CI], 0.521-0.771), using BSPM alone was 0.716 (95% CI, 0.638-0.793), and using the combination of BSPM and H-FABP was 0.812 (95% CI, 0.747-0.876; P < .001). CONCLUSION: In patients with acute ischemic-type chest pain who have a normal cTnT at presentation, the combination of H-FABP and BSPM at first assessment identifies those with early AMI (c-statistic, 0.812; P < .001), thus allowing earlier triage to reperfusion therapy and secondary prevention.


Asunto(s)
Mapeo del Potencial de Superficie Corporal/métodos , Proteínas de Unión a Ácidos Grasos/sangre , Infarto del Miocardio/sangre , Infarto del Miocardio/diagnóstico , Anciano , Biomarcadores/sangre , Distribución de Chi-Cuadrado , Diagnóstico Precoz , Electrocardiografía , Proteína 3 de Unión a Ácidos Grasos , Femenino , Humanos , Masculino , Persona de Mediana Edad , Estudios Prospectivos , Curva ROC , Factores de Tiempo , Troponina T/sangre
17.
Echo Res Pract ; 8(1): G1-G18, 2021 03 31.
Artículo en Inglés | MEDLINE | ID: mdl-34106116

RESUMEN

The subspecialty of cardio-oncology aims to reduce cardiovascular morbidity and mortality in patients with cancer or following cancer treatment. Cancer therapy can lead to a variety of cardiovascular complications, including left ventricular systolic dysfunction, pericardial disease, and valvular heart disease. Echocardiography is a key diagnostic imaging tool in the diagnosis and surveillance for many of these complications. The baseline assessment and subsequent surveillance of patients undergoing treatment with anthracyclines and/or human epidermal growth factor (EGF) receptor (HER) 2-positive targeted treatment (e.g. trastuzumab and pertuzumab) form a significant proportion of cardio-oncology patients undergoing echocardiography. This guideline from the British Society of Echocardiography and British Cardio-Oncology Society outlines a protocol for baseline and surveillance echocardiography of patients undergoing treatment with anthracyclines and/or trastuzumab. The methodology for acquisition of images and the advantages and disadvantages of techniques are discussed. Echocardiographic definitions for considering cancer therapeutics-related cardiac dysfunction are also presented.

18.
JACC CardioOncol ; 3(1): 1-16, 2021 Mar.
Artículo en Inglés | MEDLINE | ID: mdl-34396303

RESUMEN

The subspecialty of cardio-oncology aims to reduce cardiovascular morbidity and mortality in patients with cancer or following cancer treatment. Cancer therapy can lead to a variety of cardiovascular complications, including left ventricular systolic dysfunction, pericardial disease, and valvular heart disease. Echocardiography is a key diagnostic imaging tool in the diagnosis and surveillance for many of these complications. The baseline assessment and subsequent surveillance of patients undergoing treatment with anthracyclines and/or human epidermal growth factor receptor (HER) 2-positive targeted treatment (e.g., trastuzumab and pertuzumab) form a significant proportion of cardio-oncology patients undergoing echocardiography. This guideline from the British Society of Echocardiography and British Cardio-Oncology Society outlines a protocol for baseline and surveillance echocardiography of patients undergoing treatment with anthracyclines and/or trastuzumab. The methodology for acquisition of images and the advantages and disadvantages of techniques are discussed. Echocardiographic definitions for considering cancer therapeutics-related cardiac dysfunction are also presented.

19.
South Med J ; 103(12): 1204-9, 2010 Dec.
Artículo en Inglés | MEDLINE | ID: mdl-20978457

RESUMEN

OBJECTIVE: This Student Selected Component (SSC) was designed to equip United Kingdom (UK) medical students to engage in whole-person care. The aim was to explore students' reactions to experiences provided, and consider potential benefits for future clinical practice. METHODS: The SSC was delivered in the workplace. Active learning was encouraged through facilitated discussion with and observation of clinicians, the palliative team, counselling services, hospital chaplaincy and healing ministries; sharing of medical histories by patients; and training in therapeutic communication. Assessment involved reflective journals, literature appraisal, and role-play simulation of the doctor-patient consultation. Module impact was evaluated by analysis of student coursework and a questionnaire. RESULTS: Students agreed that the content was stimulating, relevant, and enjoyable and that learning outcomes were achieved. They reported greater awareness of the benefit of clinicians engaging in care of the "whole person" rather than "the disease." Contributions of other professions to the healing process were acknowledged, and students felt better equipped for discussion of spiritual issues with patients. Many identified examples of activities which could be incorporated into core teaching to benefit all medical students. CONCLUSION: The SSC provided relevant active learning opportunities for medical students to receive training in a whole-person approach to patient care.


Asunto(s)
Educación Médica/métodos , Espiritualidad , Curriculum , Educación Médica/organización & administración , Salud Holística , Humanos , Evaluación de Programas y Proyectos de Salud , Estudiantes de Medicina , Reino Unido
20.
Peptides ; 126: 170267, 2020 04.
Artículo en Inglés | MEDLINE | ID: mdl-32017948

RESUMEN

Proliferation of pulmonary fibroblasts (PF) and distal migration of smooth muscle cells (PSM) are hallmarks of pulmonary arterial hypertension (PAH). Intermedin/adrenomedullin-2 (IMD/AM2) belongs to the Calcitonin Gene-Related Peptide (CGRP)/Adrenomedullin (AM) superfamily. These peptides act via Calcitonin-Like Receptors (CLR) combined with one of three Receptor activity-modifying proteins (RAMPs). IMD/AM2 is a potent pulmonary vasodilator in animal studies. The aim was to describe expression of IMD/AM2, AM and receptor components in human pulmonary vascular cells and to elucidate effects of IMD/AM2 on human PSM migration and PF proliferation. Gene expression was detected by immunofluorescence, immunoblotting and qRT-PCR. Normotension and hypertension were simulated by applying pulsatile mechanical stretch (Flexcell® apparatus). Viable cell numbers were determined by dye exclusion. PSM chemotaxis was measured via Dunn chamber. IMD/AM2 protein was co-expressed with AM and their receptor components in pulmonary artery and microvascular endothelial (PAEC, PMVEC) and non-endothelial cells (PF, PSM), and localised to vesicles. IMD/AM2 was secreted under basal conditions, most abundantly from PF and PMVEC. Secretion from PF and PSM was enhanced by stretch. IMD/AM2 mRNA expression increased in response to hypertensive stretch of PSM. IMD/AM2 inhibited PDGF (10-7 M)-mediated PSM migration maximally at 3 × 10-10 M and PF proliferation maximally at 3 × 10-9 M. Angiotensin II (5 × 10-8 M), normotensive and hypertensive stretch augmented PF proliferation. IMD/AM2 (10-9 M) abolished the proliferative effects of Angiotensin II and normotensive stretch and attenuated the proliferative effect of hypertensive stretch alone and combined with angiotensin II. These findings indicate an important counter-regulatory role for IMD/AM2 in PAH.


Asunto(s)
Fibroblastos/patología , Pulmón/patología , Hormonas Peptídicas/metabolismo , Hipertensión Arterial Pulmonar/metabolismo , Hipertensión Arterial Pulmonar/patología , Fenómenos Biomecánicos , Movimiento Celular/fisiología , Proliferación Celular/fisiología , Fibroblastos/metabolismo , Humanos , Pulmón/metabolismo , Miocitos del Músculo Liso/metabolismo , Miocitos del Músculo Liso/patología , Hormonas Peptídicas/genética
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