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1.
J Environ Qual ; 44(1): 256-64, 2015 Jan.
Artigo em Inglês | MEDLINE | ID: mdl-25602341

RESUMO

Continuous corn ( L.) production during dry years combined with high N fertilizer rates can have a high potential for NO-N loss through tile drainage water. Claypan soils can further increase the potential for NO-N loss through tile drainage water due to the claypan layer that restricts N leaching below the tile drains. The objective of this 4-yr study was to determine whether use of managed subsurface drainage (MD) in combination with a controlled-release N fertilizer could reduce the annual amount of NO-N loss through tile drainage water compared with free subsurface tile drainage (FD) with a noncoated urea application. Due to dry conditions over the summer and fall months, MD reduced the annual amount of water drained by at least 73% compared with FD in two of the four crop years. Low N loss and reduced corn N uptake possibly resulted in carry-over N and high soil N concentrations throughout the study, which may have limited the effect of N fertilizer source on annual NO-N loss in the tile drainage water. Use of MD reduced annual NO-N loss in the tile drainage water by 78 to 85% in two of the four years. High NO-N loss reduction with MD compared with FD was largely due to dry growing season conditions in combination with wet conditions over the noncropping period.

2.
J Environ Qual ; 44(2): 585-93, 2015 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-26023977

RESUMO

Installing subsurface tile drain systems in poorly drained claypan soils to improve corn ( L.) yields could potentially increase environmental phosphorus (P) loss through the tile drainage system. The objectives of the study were to quantify the average concentration and loss of ortho-P in tile drain water from a claypan soil and to determine whether managed subsurface drainage (MD) could reduce ortho-P loss in tile water compared with free subsurface drainage (FD). Flow-weighted ortho-P concentration in the tile water was significantly lower with MD (0.09 mg L) compared with that of FD (0.15 mg L). Ortho-P loss in the tile water of this study was reduced with MD (36 g ha) by 80% compared with FD (180 g ha). Contrary to previous research, reduced ortho-P loss observed over the 4-yr study was not solely due to the reduced amount of water drained annually (63%) with MD compared with FD. During the spring period, when flow was similar between MD and FD, the concentration of ortho-P in the tile water generally was lower with MD compared with FD, which resulted in significantly less ortho-P loss with MD. We speculate that MD's ability to conserve water during the dry summer months increased corn's uptake of water and P, which reduced the amount of P available for leaching loss in the subsequent springs.

3.
Europace ; 15(2): 212-8, 2013 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-22968849

RESUMO

AIMS: We sought to characterise driving habits of contemporary implantable cardioverter defibrillator (ICD) patients. METHODS AND RESULTS: We performed a multicentre prospective observational study of consecutive ICD recipients. Non-commercial drivers with a valid licence were eligible. Patient and ICD data were recorded. All patients completed an anonymous questionnaire regarding their driving habits. Among 275 patients, 25 (9.1%) stopped driving permanently after ICD implantation. During a mean follow-up of 26.5 ± 4.5 months, 25.3% of patients received an ICD shock (52.5% appropriate). The median time to first shock was 7.0 (2.5, 17.5) months and was not significantly different between primary and secondary ICD patients. However, shocks (36.5 vs. 21.3%, P = 0.027) and recurrent shock episodes (17.5 vs. 6.2%, P = 0.011) were more common in secondary ICD patients. Physician-recommended driving restrictions were not recalled by 37.9% and not followed by 23.0% of patients. Overall, the mean duration of driving abstinence was 2.2 ± 2.9 and 3.6 ± 5.3 months for primary and secondary patients, respectively. Notably, 36.5% of secondary patients drove within 1 month. Eight patients (3.3%) received a shock while driving, five of which resulted in road traffic accidents. The annual risk of a shock while driving was 1.5%. CONCLUSIONS: Patient driving behaviour following ICD implantation is variable, with over one-third not remembering and almost one-quarter not adhering to physician-directed driving restrictions. Over one-third of secondary ICD patients drive within 1 month despite physician recommendations. Further studies are required to establish the optimal duration of driving restriction in ICD recipients.


Assuntos
Acidentes de Trânsito/estatística & dados numéricos , Condução de Veículo/estatística & dados numéricos , Desfibriladores Implantáveis/efeitos adversos , Desfibriladores Implantáveis/estatística & dados numéricos , Parada Cardíaca Extra-Hospitalar/epidemiologia , Parada Cardíaca Extra-Hospitalar/terapia , Idoso , Feminino , Humanos , Irlanda/epidemiologia , Estimativa de Kaplan-Meier , Masculino , Pessoa de Meia-Idade , Parada Cardíaca Extra-Hospitalar/prevenção & controle , Estudos Prospectivos , Fatores de Risco
4.
J Clin Med ; 12(4)2023 Feb 06.
Artigo em Inglês | MEDLINE | ID: mdl-36835818

RESUMO

BACKGROUND: This paper looks to validate the risk score from the Heart Failure Association of the European Society of Cardiology and the International Cardio-Oncology Society (HFA-ICOS) for predicting potential cardiotoxicity from anticancer therapy for patients positive for human epidermal growth factor receptor 2. METHODS: A total of 507 patients with at least five years since index diagnosis of breast cancer were retrospectively divided according to the HFA-ICOS risk proforma. According to level of risk, these groups were assessed for rates of cardiotoxicity via mixed-effect Bayesian logistic regression model. RESULTS: A follow-up of five years observed cardiotoxicity of 3.3% (n = 3) in the low-risk, 3.3% (n = 10) in the medium-risk, 4.4% (n = 6) in the high-risk, and 38% (n = 6) in the very-high-risk groups respectively. For cardiac events related to treatment, the risk was significantly higher for the very-high-risk category of HFA-ICOS compared to other categories (Beta = 3.1, 95% CrI: 1.5, 4.8). For overall cardiotoxicity related to treatment, the area under the curve was 0.643 (CI 95%: 0.51, 0.76), with 26.1% (95% CI: 8%, 44%) sensitivity and 97.9% (95% CI: 96%, 99%) specificity. CONCLUSIONS: The HFA-ICOS risk score has moderate power in predicting cancer therapy-related cardiotoxicity in HER2-positive breast cancer patients.

5.
J Environ Qual ; 49(4): 1000-1010, 2020 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-33016497

RESUMO

Expansion of subsurface drainage into forage production may have a deleterious effect on surface waters due to increased nitrogen and phosphorus loading. The impact of controlled subsurface drainage (CD) on nitrogen and phosphorus loss compared with free subsurface drainage (FD) in tile drainage water has been explored to a lesser extent from forage production systems. This study quantifies the effects of CD and FD on average seasonal concentrations and cumulative loads of the total suspended solids (TSS), nitrate nitrogen (NO3 -N), and dissolved reactive phosphorus (DRP) in subsurface drainage water from a poorly drained floodplain soil in a cereal rye (Secale cereale L.)-sorghum [Sorghum bicolor (L.) Moench] rotation with rotational cattle grazing. During all crop seasons of sorghum production (2010-2013), CD had 6.03-9.63 mg L-1 less NO3 -N than FD. Mean DRP concentration was significantly higher for CD than for FD during all seasons except for sorghum in 2012-2013. Average cumulative discharge was 38 and 314 m3 ha-1 less for CD than for FD during sorghum and cereal rye growing seasons, respectively. Controlled drainage had 0.68-6.14 kg ha-1 lower cumulative NO3 -N loads than FD. The DRP loads were dependent on discharge. During sorghum growing seasons, TSS and DRP loads were 79-90% lower in CD compared with FD. The ability to reduce drainage water flow from tiles and subsequent nitrogen and phosphorus loading with CD compared with FD in a floodplain soil indicates that CD can be effective best management practice for forage production systems.


Assuntos
Agricultura , Solo , Animais , Bovinos , Nitrogênio , Nutrientes , Fósforo
6.
Eur J Echocardiogr ; 10(2): 370-1, 2009 Mar.
Artigo em Inglês | MEDLINE | ID: mdl-19091792

RESUMO

Right ventricular migration of a systemic venous stent is a rare complication. We present a case of stent migration in a 65-year-old male who underwent palliative intervention for inferior vena cava compression secondary to malignant mesothelioma. Two- and three-dimensional echocardiographic images revealed evidence of a free-stent trapped in the tricuspid valvular apparatus causing severe tricuspid regurgitation.


Assuntos
Corpos Estranhos , Migração de Corpo Estranho/diagnóstico por imagem , Mesotelioma/diagnóstico por imagem , Pneumotórax/diagnóstico por imagem , Stents/efeitos adversos , Veia Cava Inferior/diagnóstico por imagem , Idoso , Ecocardiografia , Ecocardiografia Tridimensional , Evolução Fatal , Migração de Corpo Estranho/patologia , Humanos , Masculino , Mesotelioma/diagnóstico , Mesotelioma/patologia , Pneumotórax/patologia
7.
Eur Heart J ; 29(11): 1418-23, 2008 Jun.
Artigo em Inglês | MEDLINE | ID: mdl-18424446

RESUMO

AIMS: There is a paucity of published data on prospectively identified rates of out-of-hospital sudden cardiac death (SCD). We sought to determine the incidence, survival and aetiology of out-of-hospital SCD in the West of Ireland for the year 2005. METHODS AND RESULTS: Data from emergency room resuscitation records were collected throughout the year from all hospitals in the West of Ireland and recorded according to pre-specified criteria. Hospital records of survivors were analysed. Simultaneously, autopsy reports from all pathology laboratories in the region were systematically reviewed and cases of SCD identified. Cardiac arrest associated with non-cardiac pathology was excluded. The population base was 414,277. There were 212 recorded cases of out-of-hospital SCD; 160 (75.5%) were male and the mean age was 63.3 years. The incidence rate was 51.2/100,000/year. The most common aetiology was coronary artery disease (161 cases; 75.9%). The majority of cases occurred in the home (152, 71.7%). Thirteen (6.1%) patients survived to admission of whom eight (3.8%) were alive at discharge. All survivors had ventricular fibrillation as the presenting rhythm. CONCLUSION: The burden of SCD in the West of Ireland is considerable. The vast majority of cases occur in the home. Survival rates in this rural population cohort remain low.


Assuntos
Morte Súbita Cardíaca/epidemiologia , População Rural/estatística & dados numéricos , Reanimação Cardiopulmonar/estatística & dados numéricos , Morte Súbita Cardíaca/etiologia , Serviços Médicos de Emergência/estatística & dados numéricos , Métodos Epidemiológicos , Feminino , Humanos , Irlanda/epidemiologia , Masculino , Pessoa de Meia-Idade , Fatores de Tempo
8.
Am J Cardiol ; 96(2): 257-62, 2005 Jul 15.
Artigo em Inglês | MEDLINE | ID: mdl-16018853

RESUMO

The prognostic values of tissue Doppler imaging and color M-mode diastolic indexes were studied in 225 patients who had symptomatic systolic heart failure in the ADEPT study. The primary end point of death, transplantation, or hospitalization due to heart failure occurred in 65 patients and was independently predicted by shorter deceleration time, lower ratio of pulmonary vein systolic to diastolic velocity, and increasing levels of the ratios of early transmitral velocity to early annular velocity or velocity of propagation. For the ratio of early transmitral velocity to early annular velocity, this prediction was additive to deceleration time. Newer diastolic indexes provide an independent prediction of clinical outcomes.


Assuntos
Ecocardiografia Doppler em Cores/métodos , Ecocardiografia Doppler de Pulso/métodos , Insuficiência Cardíaca/diagnóstico por imagem , Disfunção Ventricular Esquerda/diagnóstico por imagem , Fatores Etários , Idoso , Feminino , Seguimentos , Insuficiência Cardíaca/mortalidade , Insuficiência Cardíaca/fisiopatologia , Humanos , Masculino , Pessoa de Meia-Idade , Valor Preditivo dos Testes , Estudos Prospectivos , Medição de Risco , Sensibilidade e Especificidade , Índice de Gravidade de Doença , Fatores Sexuais , Taxa de Sobrevida , Disfunção Ventricular Esquerda/mortalidade , Disfunção Ventricular Esquerda/fisiopatologia
9.
J Heart Lung Transplant ; 24(2): 229-30, 2005 Feb.
Artigo em Inglês | MEDLINE | ID: mdl-15701443

RESUMO

Refusal of treatment can have fatal consequences for heart failure patients who could otherwise benefit from ventricular assist device therapy. Ethical dilemmas arise when treatment refusals seem based on unsound reasoning by patients. Using a clinical case from our medical center, we explored the complex ethical issues associated with patient refusal of ventricular assist device therapy due to the patient's perception of large device size as compared to other mechanical heart technologies. Early on, the medical team must assess a patient's refusal of therapy by reflecting on the decisionmaking capacity of the patient to determine whether such refusal is truly "informed," and all incidents of informed refusal should be clearly documented in the patient's chart.


Assuntos
Insuficiência Cardíaca/cirurgia , Coração Auxiliar , Consentimento Livre e Esclarecido/ética , Recusa do Paciente ao Tratamento , Adulto , Tomada de Decisões , Desenho de Equipamento , Ética Médica , Evolução Fatal , Humanos , Masculino , Futilidade Médica , Defesa do Paciente , Prognóstico
10.
Am J Cardiol ; 93(11): 1443-4, A12, 2004 Jun 01.
Artigo em Inglês | MEDLINE | ID: mdl-15165938

RESUMO

Two hundred sixty-three consecutive patients with hypertrophic cardiomyopathy underwent stress testing. Major complications occurred in 0.04% of patients and minor events occurred in 23%.


Assuntos
Cardiomiopatia Hipertrófica/diagnóstico , Teste de Esforço , Contraindicações , Ecocardiografia , Eletrocardiografia , Teste de Esforço/efeitos adversos , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Consumo de Oxigênio , Estudos Prospectivos , Fatores de Risco , Segurança , Obstrução do Fluxo Ventricular Externo/diagnóstico por imagem
11.
Am J Cardiol ; 94(3): 409-11, 2004 Aug 01.
Artigo em Inglês | MEDLINE | ID: mdl-15276123

RESUMO

Transthoracic echocardiography (TTE) is often technically difficult on patients in intensive care units. Contrast echocardiography can improve left ventricular wall visualization and the assessment of regional and global left ventricular wall motion. Our study undertook to determine what proportion of nondiagnostic TTE studies on patients in intensive care units could be salvaged (i.e., converted to diagnostic studies) with contrast. Ninety-two patients with nondiagnostic TTEs had a repeat study after contrast. Using predefined criteria, 51% of studies were salvaged with contrast. Female gender emerged as the only factor associated with less likelihood of salvaging a study.


Assuntos
Meios de Contraste , Unidades de Cuidados Coronarianos , Ecocardiografia Transesofagiana/métodos , Aumento da Imagem/métodos , Disfunção Ventricular Esquerda/diagnóstico por imagem , Idoso , Ecocardiografia Transesofagiana/efeitos adversos , Feminino , Humanos , Masculino , Pessoa de Meia-Idade , Estudos Prospectivos , Sensibilidade e Especificidade
12.
Am J Cardiol ; 94(7): 964-6, 2004 Oct 01.
Artigo em Inglês | MEDLINE | ID: mdl-15464691

RESUMO

Real-time 3-dimensional echocardiography was performed in 10 patients with obstructive hypertrophic cardiomyopathy (HC) before and after myectomy and in 6 controls. The exact location of systolic anterior motion of the mitral leaflet was shown in all patients with HC with a predominant involvement of the medial portion in 4 patients and the middle portion in 6 patients. The smallest area of the left ventricular outflow tract was significantly smaller in patients with HC than in controls (1.4 +/- 0.7 vs 5.1 +/- 1.2 cm(2), p <0.01), significantly increased after myectomy (4.8 +/- 1.8 cm2, p <0.01) and was associated with a reduction of the pressure gradient at rest from 63 +/- 41 to 15 +/- 5 mm Hg (p <0.01).


Assuntos
Procedimentos Cirúrgicos Cardíacos , Cardiomiopatia Hipertrófica/diagnóstico por imagem , Cardiomiopatia Hipertrófica/cirurgia , Sistemas Computacionais , Ecocardiografia Tridimensional , Adulto , Aorta/diagnóstico por imagem , Aorta/fisiopatologia , Cateterismo Cardíaco , Cardiomiopatia Hipertrófica/fisiopatologia , Ecocardiografia , Ecocardiografia Doppler , Feminino , Septos Cardíacos/diagnóstico por imagem , Septos Cardíacos/fisiopatologia , Ventrículos do Coração/diagnóstico por imagem , Ventrículos do Coração/fisiopatologia , Humanos , Masculino , Pessoa de Meia-Idade , Insuficiência da Valva Mitral/diagnóstico por imagem , Insuficiência da Valva Mitral/fisiopatologia , Insuficiência da Valva Mitral/cirurgia , Sístole/fisiologia , Resultado do Tratamento , Obstrução do Fluxo Ventricular Externo/diagnóstico por imagem , Obstrução do Fluxo Ventricular Externo/fisiopatologia , Obstrução do Fluxo Ventricular Externo/cirurgia
13.
Med Sci Sports Exerc ; 34(8): 1234-41, 2002 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-12165676

RESUMO

PURPOSE: The purpose of this study was to evaluate the meaningfulness of exercise training responses in patients with end stage renal disease (ESRD). METHODS: Eighteen ESRD patients [(mean +/- SD); 54.3 +/- 17.1 yr] completed a training regime progressing to accumulate 40 min of stationary cycling, three times per week for 6 months. .VO(2peak) determined via incremental cycle ergometer protocol, and .VO(2) kinetics determined from a transition from unloaded pedalling to an exercise intensity corresponding to 90% of VT, were assessed at baseline and at 3 and 6 months of training. RESULTS: Repeated measures analysis of variance revealed significant changes (P < 0.05) on the time factor for .VO(2peak), VO(2)-V(T), and .VO(2) kinetics. Post hoc analysis revealed that .VO(2peak) and .VO(2) kinetics significantly (P < 0.05) improved at 3 months of training with no further improvements thereafter. Analysis of individual subject response data revealed that after 3 months of training, 61% of the patients improved .VO(2peak) by greater than the standard error of measurement (SEM = 0.07 L.min(-1)). At 6 months of training, approximately 89% of the patients improved by more than the SEM .VO(2) kinetics improved by more than the SEM (12.3 s) at 3 months of training in approximately 55% of the patients, with no increase in the number of patients exhibiting faster time constants after 6 months of training. CONCLUSION: Although conventional statistical analyses indicate that exercise training favorably alters .VO(2peak) and oxygen uptake kinetics of patients with ESRD, it is apparent that considerable interindividual variability exists in the response to training. Consideration of the SEM data underscores the heterogeneity of adaptive response in this patient group and may be valuable in assessing the efficacy of therapeutic exercise rehabilitation.


Assuntos
Exercício Físico/fisiologia , Falência Renal Crônica/reabilitação , Adulto , Idoso , Análise de Variância , Análise Química do Sangue , Índice de Massa Corporal , Fenômenos Fisiológicos Cardiovasculares , Estudos de Casos e Controles , Estudos de Coortes , Feminino , Humanos , Falência Renal Crônica/fisiopatologia , Masculino , Pessoa de Meia-Idade , Estado Nutricional , Consumo de Oxigênio/fisiologia , Resistência Física , Probabilidade , Valores de Referência , Testes de Função Respiratória , Resultado do Tratamento
15.
Ann Thorac Surg ; 79(5): 1473-9, 2005 May.
Artigo em Inglês | MEDLINE | ID: mdl-15854918

RESUMO

BACKGROUND: There is increasing interest in the role of valve repair for patients with isolated severe aortic regurgitation. Those with bicuspid aortic valves are suggested as most suitable for repair. Morphologic features of these valves that suggest feasibility of repair are not well defined. METHODS: Perioperative echocardiograms on 132 consecutive patients (mean age 42 +/- 12 years; 94% male), with bicuspid valves and isolated aortic regurgitation undergoing surgery at our institution were reviewed. Seventy-five patients (57%) underwent successful valve repair. Repair was attempted but unsuccessful for another 8 patients (6 intraoperatively and 2 before discharge). RESULTS: Cusp prolapse was the most common primary mechanism of regurgitation (88 patients [67%]), with 81 patients having primarily eccentrically directed regurgitation. Echocardiographic examination of 72 (55%) had evidence of cusp thickening with 40 (30%) having cusp calcification. By multivariate analysis, an eccentric regurgitant jet direction (odds ratio = 14.3; 95% confidence interval [CI] = 3.4 to 59.6), lack of cusp thickening (odds ratio = 5.9 [1.7 to 20]), lack of cusp calcification (odds ratio = 4.2; [1.1 to 16.7]) and the absence of commissural thickening (odds ratio = 4.8 [1.3 to 16.7]) were independently associated with a greater likelihood of successful valve repair. Greater cusp thickening was the only factor associated with attempted but failed repair. CONCLUSIONS: Successful repair of regurgitant bicuspid aortic valves was more feasible for those patients with eccentric regurgitant jets, those without cusp or commissural thickening or cusp calcification. Recognition of these features may enhance patient selection and improve procedural outcomes with aortic valve repair.


Assuntos
Insuficiência da Valva Aórtica/cirurgia , Valva Aórtica/cirurgia , Implante de Prótese de Valva Cardíaca/métodos , Valva Mitral/cirurgia , Adulto , Insuficiência da Valva Aórtica/diagnóstico por imagem , Dispneia/etiologia , Eletrocardiografia , Feminino , Prolapso das Valvas Cardíacas/etiologia , Humanos , Masculino , Pessoa de Meia-Idade , Seleção de Pacientes , Reprodutibilidade dos Testes , Resultado do Tratamento , Ultrassonografia
16.
J Chem Phys ; 120(7): 3348-52, 2004 Feb 15.
Artigo em Inglês | MEDLINE | ID: mdl-15268488

RESUMO

We study the transient response of a Brownian particle with general damping in a system of metastable potential well. The escape rate is evaluated as a function of time after an infinite wall is removed from the potential barrier. It takes a relaxation time for the rate to reach its limit value and this rate relaxation time differs from the relaxation time of the majority of the probability around the bottom of the potential well. The rate relaxation time is found to depend on the temperature as well as the damping constant. It involves the diffusion time and the instanton time, in general agreement with recent studies of the overdamped case by Bier et al. [Phys. Rev. E 59, 6422 (1999)].

17.
Am J Transplant ; 4(7): 1200-3, 2004 Jul.
Artigo em Inglês | MEDLINE | ID: mdl-15196083

RESUMO

Human herpesvirus-6 (HHV-6), a beta herpesvirus closely related to cytomegalovirus (CMV), infects the majority of the population in childhood. Human herpesvirus-6 can be reactivated in the immunosuppressed patient. After bone marrow and orthotopic liver transplant, it has been linked to various clinical syndromes, including undifferentiated febrile illness, encephalitis, pneumonitis and bone marrow suppression. To date its infectious role after orthotopic heart transplant has not been well documented. We present the case of a 32-year-old cardiac transplant recipient who initially presented 8 weeks after his transplant with high fever and headache. He developed increasing confusion, pulmonary infiltrates and neutropenia. Cytomegalovirus viral loads were negative. Polymerase chain reaction (PCR) of blood and cerebrospinal fluid detected HHV-6 DNA, consistent with HHV-6-related encephalitis, pneumonitis and bone marrow suppression. He was treated with foscarnet with gradual improvement in clinical status. We review the literature on the significance of this virus post cardiac transplant.


Assuntos
Encefalite/etiologia , Transplante de Coração/métodos , Infecções por Herpesviridae/etiologia , Herpesvirus Humano 6/metabolismo , Adulto , Antivirais/farmacologia , Citomegalovirus/metabolismo , DNA Viral/análise , Encefalite/patologia , Encefalite/virologia , Foscarnet/uso terapêutico , Transplante de Coração/efeitos adversos , Humanos , Imunossupressores/farmacologia , Leucocitose/líquido cefalorraquidiano , Leucocitose/metabolismo , Masculino , Neutropenia/terapia , Reação em Cadeia da Polimerase
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