Relationship between gait speed and physical function in patients with symptomatic peripheral artery disease

OBJECTIVE: The aim of the study was to analyze the relationship between gait speed and measurements of physical function in patients with symptomatic peripheral artery disease (PAD). METHODS: One hundred sixty-nine patients (age 66.6±9.4 years) with symptomatic PAD were recruited. Usual and fast gait speeds were assessed with a 4-meter walk test. Objective (balance, sit-to-stand, handrip strength, and six-minute walk test) and subjective (WIQ - Walking Impairment Questionnaire and WELCH - Walking Estimated-Limitation Calculated by History) measurements of physical function were obtained. Crude and adjusted linear regression analyses were used to confirm significant associations. RESULTS: Usual and fast gait speeds were significantly correlated with all objective and subjective physical function variables examined (r<0.55, p<0.05). In the multivariate model, usual gait speed was associated with six-minute walking distance (β=0.001, p<0.001), sit-to-stand test score (β=-0.005, p=0.012), and WIQ stairs score (β=0.002, p=0.006) adjusted by age, ankle brachial index, body mass index, and gender. Fast gait speed was associated with six-minute walking distance (β=0.002, p<0.001), WIQ stairs score (β=0.003, p=0.010), and WELCH total score (β=0.004, p=0.026) adjusted by age, ankle brachial index, body mass index, and gender. CONCLUSION: Usual and fast gait speeds assessed with the 4-meter test were moderately associated with objective and subjective measurements of physical function in symptomatic PAD patients.

Prevalence of peripheral arterial disease in patients with heart failure with preserved ejection fraction

OBJECTIVES: To describe the prevalence of the reduced ankle-brachial index (ABI) in patients with heart failure (HF) with preserved ejection fraction (HFpEF) attended at a HF clinic in the metropolitan region of Porto Alegre, and to compar the patients to those with reduced ejection fraction (HFrEF). METHODS: A descriptive observational study, included patients referred to the heart failure clinic in HU-Ulbra with HFpEF or HFrEF and diastolic dysfunction, and measurements of ABIs using vascular Doppler equipment were performed in both groups. RESULTS: The sample consisted of 106 patients with HF, 53.9% of the patients had HFpEF, and 19.4% had a diagnosis of peripheral arterial disease (PAD) (ABI less than 0.9). PAD was identified in 24.1% of the patients with HFpEF, while15.8% of patients in the HFrEF group were diagnosed with PAD. CONCLUSION: Our results did not identify a significantly different prevalence of altered and compatible PAD values in patients with HFpEF. However, we showed a prevalence of 19.4%, a high value if we consider similar populations.

Autonomic and Vascular Control in Prehypertensive Subjects with a Family History of Arterial Hypertension / Controle Autonômico e Vascular em Pré-Hipertensos com Histórico Familiar de Hipertensão Arterial

Abstract Background: Individuals with a family history of systemic arterial hypertension (FHSAH) and / or prehypertension have a higher risk of developing this pathology. Objective: To evaluate the autonomic and vascular functions of prehypertensive patients with FHSAH. Methods: Twenty-five young volunteers with FHSAH, 14 normotensive and 11 prehypertensive subjects were submitted to vascular function evaluation by forearm vascular conductance(VC) during resting and reactive hyperemia (Hokanson®) and cardiac and peripheral autonomic modulation, quantified, respectively, by spectral analysis of heart rate (ECG) and systolic blood pressure (SBP) (FinometerPRO®). The transfer function analysis was used to measure the gain and response time of baroreflex. The statistical significance adopted was p ≤ 0.05. Results: Pre-hypertensive individuals, in relation to normotensive individuals, have higher VC both at rest (3.48 ± 1.26 vs. 2.67 ± 0.72 units, p = 0.05) and peak reactive hyperemia (25, 02 ± 8.18 vs. 18.66 ± 6.07 units, p = 0.04). The indices of cardiac autonomic modulation were similar between the groups. However, in the peripheral autonomic modulation, greater variability was observed in prehypertensive patients compared to normotensive individuals (9.4 [4.9-12.7] vs. 18.3 [14.8-26.7] mmHg2; p < 0.01) and higher spectral components of very low (6.9 [2.0-11.1] vs. 13.5 [10.7-22.4] mmHg2, p = 0.01) and low frequencies (1.7 [1.0-3.0] vs. 3.0 [2.0-4.0] mmHg2, p = 0.04) of SBP. Additionally, we observed a lower gain of baroreflex control in prehypertensive patients compared to normotensive patients (12.16 ± 4.18 vs. 18.23 ± 7.11 ms/mmHg, p = 0.03), but similar delay time (-1.55 ± 0.66 vs. -1.58 ± 0.72 s, p = 0.90). Conclusion: Prehypertensive patients with FHSAH have autonomic dysfunction and increased vascular conductance when compared to normotensive patients with the same risk factor.

Resumo Fundamento: Indivíduos com histórico familiar de hipertensão arterial sistêmica (HFHAS) e/ou pré-hipertensão apresentam maior risco de desenvolver essa patologia. Objetivo: Avaliar as funções autonômica e vascular de pré-hipertensos com HFHAS. Métodos: Vinte e cinco voluntários jovens com HFHAS, sendo 14 normotensos e 11 pré-hipertensos foram submetidos à avaliação da função vascular, por meio da condutância vascular do antebraço (CV) durante repouso e hiperemia reativa (Hokanson®), e da modulação autonômica cardíaca e periférica, quantificada, respectivamente, por meio da análise espectral da frequência cardíaca (ECG) e da pressão arterial sistólica (PAS) (FinometerPRO®). A análise da função de transferência foi utilizada para mensurar o ganho e o tempo de resposta do barorreflexo. A significância estatística adotada foi p ≤ 0,05. Resultados: Pré-hipertensos, em relação aos normotensos, tem maior CV tanto em repouso (3,48 ± 1,26 vs. 2,67 ± 0,72 unidades; p = 0,05) quanto no pico hiperemia reativa (25,02 ± 8,18 vs. 18,66 ± 6,07 unidades; p = 0,04). Os índices da modulação autonômica cardíaca foram semelhantes entre os grupos. Entretanto, na modulação autonômica periférica, foi observado, nos pré-hipertensos em relação aos normotensos, maior variabilidade (9,4 [4,9-12,7] vs. 18,3 [14,8-26,7] mmHg2; p < 0,01) e maiores componentes espectrais de muito baixa (6,9 [2,0-11,1] vs. 13,5 [10,7-22,4] mmHg2; p = 0,01) e baixa frequências (1,7 [1,0-3,0] vs. 3,0 [2,0-4,0] mmHg2; p = 0,04) da PAS. Adicionalmente, observamos menor ganho do controle barorreflexo nos pré-hipertensos em relação aos normotensos (12,16 ± 4,18 vs. 18,23 ± 7,11 ms/mmHg; p = 0,03), porém, tempo de retardo semelhante (-1,55 ± 0,66 vs. -1,58 ± 0.72 s; p = 0,90). Conclusão: Pré-hipertensos com HFHAS tem disfunção autonômica e condutância vascular aumentada quando comparados a normotensos com o mesmo fator de risco.

Enfermedad arterial periférica de extremidades inferiores: diagnóstico y tratamiento / Peripheric arterial disease: diagnosis and treatment

La enfermedad arterial periférica (EAP) es la afectación de la circulación arterial especialmente a nivel de las extremidades inferiores. Su prevalencia aumenta con la edad. La mayoría de los afectados estarán asintomáticos, lo que supone un reto, ya que debemos hacer un esfuerzo activo para diagnosticarla. Al diagnosticar la EAP, debemos hacer entender a nuestros pacientes que el riesgo no es perder la extremidad, sino presentar complicaciones cardiovasculares mayores o incluso, la muerte. Debemos orientar al paciente para realizar un cambio en su estilo de vida y a la vez concientizar al médico de atención primaria para realizar prevención y diagnóstico precoz de la EAP para así evitar progresión de la enfermedad con consecuencias irreversibles(AU)

Peripheral arterial disease (PAD) is the involvement of the arterial circulation especially in the lower limbs. The prevalence of this pathology increases with age. The majority of those affected will be asymptomatic, which is a challenge, since we have to make an active effort to diagnose them. When diagnosing PAD, we must make our patients understand that the risk is not to lose the limb, but to suffer major cardiovascular complications or death. We must guide the patient to make a change in lifestyle and at the same time. raise awareness of the primary care physician to perform prevention or early diagnosis of PAD and thus prevent progression of the disease with irreversible consequences(AU)

Does peripheral arterial occlusive disease influence muscle strength and exercise capacity in COPD patients? / A doença arterial periférica obstrutiva influencia a força muscular e a capacidade de exercício nos portadores de doença pulmonar obstrutiva crônica?

Abstract Background The pathophysiology of chronic obstructive pulmonary disease (COPD) is complex and understanding of it has been changing in recent years, with regard to its multisystemic manifestations, especially peripheral dysfunction and its influence on intolerance to exercise. Objectives To evaluate the relationship between peripheral arterial occlusive disease (PAOD) and peripheral muscle strength and exercise capacity in COPD patients. Methods We conducted a cross-sectional study of 35 patients with COPD who were evaluated with the Ankle-Brachial Index, handgrip strength test, 1 repetition maximum (1RM) of knee extensors and flexors, and distance covered in the incremental shuttle walking test (dISWT). Results COPD patients with coexisting PAOD had lower dominant handgrip strength test results (33.00 vs. 26.66 kgf, p = 0.02) and worse performance in the dISWT (297.32 vs. 219.41 m, p = 0.02) when compared to the COPD patients without PAOD. Strong correlations were found between the result of the handgrip strength test and both the dISWT (r = 0.78; p < 0.001) and the 1RM/knee extension (r = 0.71; p = 0.03); and also between the dISWT and both the 1RM/knee extension (r = 0.72; p = 0.02) and the 1RM/knee flexion (r = 0.92; p < 0.001). The linear regression model showed that the dISWT variable alone explains 15.3% of the Ankle-Brachial Index result (p = 0.01). Conclusion COPD patients with PAOD exhibit reduced muscle strength and lower exercise capacity than COPD patients without PAOD.

Resumo Contexto A doença pulmonar obstrutiva crônica (DPOC) apresenta uma complexa fisiopatologia e sua compreensão vem se modificando nos últimos anos, com atenção para as manifestações multissistêmicas, em especial a disfunção periférica e sua influência na intolerância ao exercício físico. Objetivo Avaliar o impacto da doença arterial periférica obstrutiva (DAOP) na força muscular periférica e na capacidade de exercício dos portadores de DPOC. Métodos Estudo transversal realizado com 35 portadores de DPOC, que foram avaliados pelo índice tornozelo-braquial, teste de força de preensão palmar (FPP), uma repetição máxima (1RM) de extensores e flexores de joelho, e a distância no incremental shuttle walking test (dISWT). Resultados Portadores de DPOC com DAP coexistente apresentaram menor FPP da mão dominante (33,00 versus 26,66 kgf, p = 0,02) e pior desempenho no dISWT (297,32 versus 219,41 m, p = 0,02) quando comparados aos portadores de DPOC sem DAP. Fortes correlações foram encontradas entre a medida da FPP e a dISWT (r = 0,78; p < 0,001) e a 1RM/extensão de joelho (r = 0,71; p = 0,03); entre a dISWT e a 1RM/extensão de joelho (r = 0,72; p = 0,02) e a 1RM/flexão de joelho (r = 0,92; p < 0,001). O modelo de regressão linear identificou que a variável dISWT explica isoladamente 15,3% do resultado do índice tornozelo braquial (p = 0,01). Conclusão Portadores de DPOC com DAOP coexistente apresentam maior perda da força muscular periférica e pior desempenho da capacidade de exercício quando comparados aos portadores de DPOC sem DAOP.

Prevalencia de enfermedad arterial periférica con la determinación del índice tobillo-brazo en pacientes con artritis reumatoide / Prevalence of peripheral arterial disease measured with the ankle-arm index in rheumatic patients suffering from rheumatoid arthritis

La enfermedad arterial periférica (EAP) afecta 15-20% de las personas mayores de 70 años. Objetivo: Establecer la prevalencia de enfermedad arterial periférica mediante la determinación del índice tobillo brazo (ITB) en pacientes con Artritis Reumatoide que acuden a la consulta de reumatología, en el Hospital Universitario "Ángel Larralde" Valencia-Venezuela durante el periodo Enero-Abril 2016. Métodos: Estudio descriptivo, transversal y de campo. Se estudiaron 50 pacientes. La recolección de los datos personales y familiares, así como el registro de las medidas antropométricas, se hizo mediante un formulario prediseñado, utilizando una entrevista estructurada. Resultados: El promedio de edad fue de 54,6 ± 11 años, con un rango de 50 a 60 años; predominio del sexo femenino 76%; índice isquémico promedio de 0,74 ± 0,38 siendo normal en 20%, 42% con EAP leve a moderada, 28% con EAP grave y 10% vaso no compresible; la edad sigue siendo el marcador principal de riesgo de EAP. Entre los factores de riesgo cardiovascular (FRCV) modificables la dislipidemia se observó en 38%,obesidad 12%, sedentarismo 100%, consumo de alcohol 2%, tabaquismo 32%, hipertensión arterial 32% y Diabetes Mellitus (DM) 22%. El 74% de los pacientes han utilizado terapia biológica como tratamiento para Artritis Reumatoide dada por Adalimumab/Leflunomida 24%, Metrotrexate/ Etarnecept 10%, Metrotrexate /Adalimumab 8%. Al correlacionar los FRCV no modificables (edad, sexo) y modificables (dislipidemia, obesidad, sedentarismo, consumo de alcohol, tabaquismo, antecedentes de HTA y DM) con el uso de la terapia biológica sólo se observó relación estadísticamente significativa con el tabaquismo (P=0.04) y, con una relación inversa muy baja (-0.293) pero estadísticamente significativa (P=0.039), con el valor bioquímico de la glicemia. Conclusiones: En vista de la poca asociación entre la alteración del ITB con los factores de riesgo cardiovascular, podría plantearse la posibilidad que la Artritis Reumatoide per se sea un factor independiente para desarrollar EAP(AU)

Peripheral arterial disease (PAD) affects 15-20% of people older than 70 years. Objectives: to determine the prevalence of peripheral arterial disease measuring the ankle-brachial index in ambulatory patients who had Rheumatoid Arthritis, at the Hospital Universitario Angel Larralde in Valencia-Venezuela during the period 2015-2016. Methods: This is a descriptive, transversal study, with a sample of 50 patients who attended the rheumatology clinic of the hospital. The collection of personal and family data as well as the registration of anthropometric measurements were done through a pre-designed form with a structured interview. The average age was 54.6 ± 11 years. Results: gender: 76% were female; the average age was between 50 and 60 years, mean 0.74 ± 0.38; the Ischemic index was normal in 20%, 42% had mild to moderate PAD, in 28% it was severe and 10% non compressible. Age remains as the main risk marker for EAP; among the modifiable risk factors, dyslipidemia was observed in 38%, obesity 12%, sedentarism 100%, alcohol consumption 2%, smoking 32%, hypertension 32% and Diabetes Mellitus 22%. 74% of patients had received biological therapy as a treatment for rheumatoid arthritis: Adalimumab / Leflunomide 24%, Metrotrexate / Etarnecept 10%, Metrotrexate / Adalimumab 8%. When correlating non-modifiable CVD (age, sex) and modifiable (dyslipidemia, obesity, sedentary lifestyle, alcohol consumption, smoking, history of hypertension and DM) and use of biological therapy, a statistically significant relationship with smoking (P=0.04), and with a very low inverse (-0.293) statistically significant (P = 0.039) with the biochemical value of glycemia. Conclusions: Rheumatoid Arthritis per se may be an independent factor in the development of PAD. Recommendation: there is a need to routinely perform ABI in patients with asymptomatic RA from a cardiovascular point of view.(AU)

Association of Peripheral Arterial and Cardiovascular Diseases in Familial Hypercholesterolemia / Associação das Doenças Arterial Periférica e Cardiovascular na Hipercolesterolemia Familiar

Background: Familial hypercholesterolemia (FH) is an autosomal dominant genetic disease characterized by an elevation in the serum levels of total cholesterol and of low-density lipoproteins (LDL- c). Known to be closely related to the atherosclerotic process, FH can determine the development of early obstructive lesions in different arterial beds. In this context, FH has also been proposed to be a risk factor for peripheral arterial disease (PAD). Objective: This observational cross-sectional study assessed the association of PAD with other manifestations of cardiovascular disease (CVD), such as coronary artery and cerebrovascular disease, in patients with heterozygous FH. Methods: The diagnosis of PAD was established by ankle-brachial index (ABI) values ≤ 0.90. This study assessed 202 patients (35% of men) with heterozygous FH (90.6% with LDL receptor mutations), mean age of 51 ± 14 years and total cholesterol levels of 342 ± 86 mg /dL. Results: The prevalences of PAD and previous CVD were 17% and 28.2 %, respectively. On multivariate analysis, an independent association between CVD and the diagnosis of PAD was observed (OR = 2.50; 95% CI: 1.004 - 6.230; p = 0.049). Conclusion: Systematic screening for PAD by use of ABI is feasible to assess patients with FH, and it might indicate an increased risk for CVD. However, further studies are required to determine the role of ABI as a tool to assess the cardiovascular risk of those patients. .

Fundamento: A hipercolesterolemia familiar (HF) é uma doença de herança genética autossômica dominante caracterizada pela elevação dos valores séricos de colesterol total e das lipoproteínas de baixa densidade (LDL-c). Conhecida por estar estreitamente relacionada ao processo aterosclerótico, a HF pode determinar o desenvolvimento de lesões obstrutivas precoces em distintos leitos arteriais. Nesse contexto, a HF também tem sido proposta como fator de risco para a doença arterial periférica (DAP). Objetivo: Avaliamos, por meio de um estudo transversal e observacional, a associação da DAP com outras manifestações de doença cardiovascular (DCV), isto é, doença arterial coronária e cerebrovascular em portadores de HF heterozigótica. Métodos: diagnóstico de DAP foi estabelecido pela medida do índice tornozelo-braquial (ITB) com valores ≤ 0,90. Foram estudados 202 pacientes com HF (90,6% apresentando mutações no receptor da LDL), idade 51 ± 14 anos, colesterol total 342 ± 86 mg/dL e 35% do sexo masculino. Resultados: As prevalências de DAP e de DCV prévia foram 17% e 28,2%, respectivamente. Houve associação independente da DAP com a DCV (OR = 2,50, IC 95% 1,004-6,230, p = 0,049) após análise multivariada. Conclusão: A pesquisa sistemática da DAP por meio do ITB é factível na avaliação de portadores de HF e pode sinalizar aumento no risco de DCV. Contudo, mais estudos são necessários para determinar o papel do uso do ITB como ferramenta para avaliação do risco cardiovascular nessa população. (Arq Bras Cardiol. 2014; 103(2):118-123) .

Association between peripheral arterial disease and creactive protein in the japanese-brazilian population / Avaliação da associação entre doença arterial obstrutiva periférica e níveis aumentados de proteína C-reativa em população nipo-brasileira

OBJECTIVE: To evaluate the relationship between peripheral arterial disease and elevated levels of C-reactive protein in the Japanese-Brazilian population of high cardiovascular risk. METHODS: We conducted a cross-sectional study derived from a population-based study on the prevalence of diabetes and associated diseases in the Japanese-Brazilian population. One thousand, three hundred and thirty individuals aged e" 30 underwent clinical and laboratory examination, including measurement of ultrasensitive C-reactive protein. The diagnosis of peripheral arterial disease was performed by calculating the ankle-brachial index. We considered with peripheral arterial disease patients who had ankle-brachial index d" 0.9. After applying the exclusion criteria, 1,038 subjects completed the study. RESULTS: The mean age of the population was 56.8 years; 46% were male. The prevalence of peripheral arterial disease was 21%, with no difference between genders. Data analysis showed no association between peripheral arterial disease and ultrasensitive C-reactive protein. Patients with ankle-brachial index d" 0.70 showed higher values of ultrasensitive C-reactive protein and worse cardiometabolic profile. We found a positive independent association of peripheral arterial disease with hypertension and smoking. CONCLUSION: The association between low levels of ankle-brachial index and elevated levels of ultrasensitive C-reactive protein may suggest a relationship of gravity, aiding in the mapping of high-risk patients. .

OBJETIVO: avaliar a relação entre a doença arterial obstrutiva periférica e níveis elevados de proteína C-reativa em população nipo-brasileira de alto risco cardiovascular. MÉTODOS: estudo transversal derivado de estudo de base populacional sobre a prevalência de diabetes e doenças associadas em população nipo-brasileira. Mil trezentos e trinta indivíduos com idade >30 foram submetidos a exame clínico e laboratorial, incluindo a dosagem da proteína C-reativa ultrassensível. O diagnóstico da doença arterial obstrutiva periférica foi realizado através do cálculo do índice tornozelo-braço. Foram considerados portadores de doença arterial obstrutiva periférica os pacientes que apresentaram índice tornozelo-braço <0,9. Após aplicação dos critérios de exclusão, 1038 indivíduos completaram o estudo. RESULTADOS: a média de idade da população foi 56,8 anos, 46% pertencentes ao sexo masculino. A prevalência da doença arterial obstrutiva periférica foi 21%, sem diferença entre os sexos. A análise dos dados não mostrou associação entre doença arterial obstrutiva periférica e proteína C-reativa ultrassensível. Os pacientes com índice tornozelo-braço <0,70 apresentaram valores mais elevados de proteína C-reativa ultrassensível e o pior perfil cardiometabólico. Encontramos associação positiva e independente da doença arterial obstrutiva periférica com hipertensão arterial e tabagismo. . CONCLUSÃO: a associação encontrada entre valores baixos de índice tornozelo-braço e níveis elevados de proteína C-reativa ultrassensível pode sugerir uma relação de gravidade auxiliando mapeamento dos pacientes ...

Ankle-brachial index as a predictor of coronary disease events in elderly patients submitted to coronary angiography

OBJECTIVES: To correlate the importance of the ankle-brachial index in terms of cardiovascular morbimortality and the extent of coronary arterial disease amongst elderly patients without clinical manifestations of lower limb peripheral arterial disease. METHODS: We analyzed prospective data from 100 patients over 65 years of age with coronary arterial disease, as confirmed by coronary angiography, and with over 70% stenosis of at least one sub-epicardial coronary artery. We measured the ankle-brachial index immediately after coronary angiography, and a value of <0.9 was used to diagnose peripheral arterial disease. RESULTS: The patients' average age was 77.4 years. The most prevalent risk factor was hypertension (96%), and the median late follow-up appointment was 28.9 months. The ankle-brachial index was <0.9 in 47% of the patients, and a low index was more prevalent in patients with multiarterial coronary disease compared to patients with uniarterial disease in the same group. Using a bivariate analysis, only an ankle-brachial index of <0.9 was a strong predictive factor for cardiovascular events, thereby increasing all-cause deaths and fatal and non-fatal acute myocardial infarctions two- to three-fold. CONCLUSION: In elderly patients with documented coronary disease, a low ankle-brachial index (<0.9) was associated with the severity and extent of coronary arterial disease, and in late follow-up appointments, a low index was correlated with an increase in the occurrence of major cardiovascular events. .

Low-intensity resistance exercise does not affect cardiac autonomic modulation in patients with peripheral artery disease

OBJECTIVE: To analyze the effect of a single bout of resistance exercise on cardiac autonomic modulation in patients with peripheral artery disease. METHODS: Fifteen patients with peripheral artery disease (age: 58.3±4.0 years) underwent the following sessions in a random order: resistance exercise (three sets of 10 repetitions of the six resistance exercises with a workload of 5-7 in the OMNI-RES scale) and control (similar to the resistance session; however, the resistance exercises were performed with no load). The frequency domain (low frequency, high frequency and sympathovagal balance) and symbolic analysis (0V, 1V and 2V patterns) of heart rate variability were obtained before and until one hour after the interventions. RESULTS: After the resistance exercise and control sessions, similar increases were observed in the consecutive heartbeat intervals (control: 720.8±28.6 vs. 790.9±34.4 ms; resistance exercise: 712.9±30.1 vs. 756.8±37.9 ms; p<0.05) and in the pattern of the symbolic analysis with no variation (0V) (control: 25.1±3.5 vs. 33.4±4.1%; resistance exercise: 26.1±3.2 vs. 29.7±3.5%; p<0.05) until 50 min after both interventions. The pattern of two variations (2V) decreased similarly (control: 11.2±2.1 vs. 8.3±2.1%; resistance exercise: 9.5±1.7 vs. 7.8±1.7%; p<0.05). In contrast, the pattern of one variation (1V), the low and high frequency bands and sympathovagal balance did not change after the interventions (p>0.05). CONCLUSION: A single bout of resistance exercise did not alter cardiac autonomic modulation in patients with peripheral artery disease. .

Doença arterial periférica e função renal na hipertensão arterial / Peripheral artery disease and kidney function in hypertensive patients

FUNDAMENTO: Pacientes com Doença Arterial Periférica (DAP) possuem um risco elevado de eventos cardiovasculares existindo uma elevada prevalência dessa patologia em pacientes com doença renal crônica. OBJETIVO: O objetivo deste estudo consiste em verificar se existe uma associação entre a DAP e a função renal em pacientes hipertensos. MÉTODOS: A amostra deste estudo foi constituída por um total de 909 pacientes com hipertensão arterial. Foi avaliada a presença de DAP, com recurso ao índice tornozelo-braço (ITB), e a determinação da função renal com base no cálculo da taxa de filtração glomerular. Os indivíduos foram divididos em grupos de acordo com o ITB anormal (< 0,9) e normal (0,9-1,4). RESULTADOS: A porcentagem de pacientes com um ITB anormal foi de 8%. No grupo de pacientes com ITB anormal a prevalência de doença renal crônica foi de 23,4%, comparativamente a uma prevalência de 11,2% no grupo com ITB normal. Por meio da análise de regressão logística multivariável, ajustando o modelo aos factores de risco cardiovasculares convencionais, identificou-se um efeito estatisticamente significativo e independente da eTFG sobre a probabilidade de desenvolvimento de DAP, com um OR de 0,987 (IC: 0,97-1,00). CONCLUSÃO: Demonstrou-se uma associação independente entre a DAP e a doença renal crônica. Dessa forma, a combinação de um diagnóstico preciso da doença renal e a medida de rotina do ITB poderá constituir um meio mais eficiente de identificação de DAP subclínica, permitindo aos indivíduos se beneficiarem de intervenções precoces com o intuito da diminuição do risco cardiovascular.

BACKGROUND: Patients with peripheral arterial disease (PAD) have a high risk of developing cardiovascular events. There is a high prevalence of PAD in individuals with kidney disease and both are important risk factors for cardiovascular events. OBJECTIVE: The aim of this study was to investigate the association between PAD and renal function in hypertensive patients. METHODS: The sample consisted of 909 individuals with arterial hypertension. The presence of PAD was evaluated using the ankle-brachial index (ABI) method and renal function was assessed based on the estimated glomerular filtration rate (eGFR). The subjects were divided into groups, according to abnormal (ABI < 0.9) and normal ABI (ABI 0.9-1.4). RESULTS: The percentage of subjects with abnormal ABI was 8%. In the group of individuals with abnormal ABI, prevalence of CKD was 23.4%, compared to a prevalence of 11.2% in patients with normal ABI. Multivariable logistic regression analysis, after adjusting the model to the conventional cardiovascular risk factors, identified a statistically significant and independent effect of eGFR on the likelihood of developing PAD, with an OR of 0.987 (CI: 0.97-1.00). CONCLUSION: An independent association between PAD and chronic kidney disease was observed in the present study. Therefore, the combination of an accurate diagnosis of kidney disease and routine ABI evaluation could constitute a more efficient means to identify subclinical PAD, allowing individuals to benefit from early interventions, aiming at reducing cardiovascular risk.

Predictors of walking capacity in peripheral arterial disease patients

OBJECTIVE: To estimate walking capacity in intermittent claudication patients through a prediction model based on clinical characteristics and the walking impairment questionnaire. METHODS: The sample included 133 intermittent claudication patients of both genders aged between 30 and 80 years. Data regarding clinical characteristics, the walking impairment questionnaire and treadmill walking test performance were obtained. Multiple regression modeling was conducted to predict claudication onset distance and total walking distance using clinical characteristics (age, height, mass, body mass index, ankle brachial index lower, gender, history of smoking and co-morbid conditions) and walking impairment questionnaire responses. Comparisons of claudication onset distance and total walking distance measured during treadmill tests and estimated by a regression equation were performed using paired t-tests. RESULTS: Co-morbid conditions (diabetes and coronary artery disease) and questions related to difficulty in walking short distances (walking indoors - such as around your house and walking 5 blocks) and at low speed (walking 1 block at average speed - usual pace) resulted in the development of new prediction models high significant for claudication onset distance and total walking distance (p<0.001). In addition, non-significant differences from the results obtained by the treadmill test and estimated by the current model (p>0.05) were observed. CONCLUSION: The current study demonstrated that walking capacity can be adequately estimated based on co-morbid conditions and responses to the walking impairment questionnaire. .

Caminhada e risco cardiovascular em pacientes com claudicação intermitente: uma revisão de literatura / Walking and cardiovascular risk in patients with intermittent claudication: a review

O treinamento de caminhada é recomendado como tratamento inicial de pacientes com claudicação intermitente (CI) devido a seu efeito na melhora da capacidade funcional. Entretanto, as principais causas de morte nessa população são os eventos cardiovasculares, que se iniciam com a presença dos fatores de risco cardiovascular (FRC). Dessa forma, é importante que o treinamento de caminhada auxilie no controle dos FRC dessa população. Diante desse quadro, o objetivo dessa revisão foi verificar o efeito do treinamento de caminhada sobre a glicemia, obesidade, dislipidemia e pressão arterial de pacientes com CI. Foram selecionados estudos originais sobre esses temas, publicados entre 1990 e 2011, em periódicos indexados nas bases de dados PubMed, LILACS e SciELO, e também os artigos encontrados nas referências bibliográficas dos estudos selecionados. Ao final da análise, 13 estudos atenderam aos critérios da revisão. Os resultados desses estudos sugerem que o treinamento de caminhada não modifica a glicemia nem os marcadores de obesidade nos pacientes com CI. Em relação à dislipidemia e à hipertensão arterial, os resultados são controversos, mas sugerem redução da pressão arterial sistólica e melhora do perfil lipídico. A diversidade dos desenhos experimentais e, principalmente, dos protocolos de treinamento empregados explicam a controvérsia dos resultados. Dessa forma, conclui-se que, apesar de sua importância, existem poucos estudos sobre os efeitos da caminhada sobre os FRC de pacientes com CI, Os dados atuais ainda são controversos, mas sugerem efeitos benéficos, que devem ser investigados no futuro com desenhos experimentais mais bem delineados.

Walking is recommended as the initial treatment for patients with intermitente claudication (IC) because its effects improving functional capacity. However, the major causes of death in this population are cardiovascular events that initiated with the presence of cardiovascular risk factors (CRF). Thus, it is importante that walking can control CRF in IC patients. The aim of this review was to assess the effect of walking training on glycemia, obesity, dyslipidemia and hypertension in patients with IC. Original papers about these issue published between 1990 and 2011 in the journals indexed in PubMed, LILACS and SciELO were searched. Papers cited in the reference list of the thosen studies were also included. Thirteen papers were selected, and their results suggest that walking training is not able to modify fasting glycemia or markers of obesity. In regard to dyslipidemia and hypertension, results are controversial, but they suggest that walking training can decrease systolic blood pressure and improve lipid profile. The diversity of the experimental designs and, especially, the diversity of the exercise protocols explain the controversial findings. In conclusion. despite of its importance, few studies investigated the effects of walking on the CRF of CI patients. Today's data suggest that walking may have beneficial effects that should be investigated in the future with better delineated experimental designs.

Interação entre as vias de sinalização de receptores serotoninérgicos e Β-adrenérgicos em artéria femoral de ratos / Interaction between serotoninergic-and β-adrenergic receptors signaling pathways in rat femoral artery / Interacción entre las vías de señalización de receptores serotoninérgicos y β-adrenégicos en la arteria femoral de ratones

FUNDAMENTO: A doença coronária tem sido amplamente estudada em pesquisas cardiovasculares. No entanto, pacientes com doença arterial periférica (DAP) têm piores resultados em comparação àqueles com doença arterial coronariana. Portanto, os estudos farmacológicos com artéria femoral são altamente relevantes para a melhor compreensão das respostas clínicas e fisiopatológicas da DAP. OBJETIVO: Avaliar as propriedades farmacológicas dos agentes contráteis e relaxantes na artéria femoral de ratos. MÉTODOS: As curvas de resposta de concentração à fenilefrina contrátil (FC) e à serotonina (5-HT) e os agentes relaxantes isoproterenol (ISO) e forskolina foram obtidos na artéria femoral de ratos isolada. Para as respostas ao relaxamento, os tecidos foram contraídos com FC ou 5-HT. RESULTADOS: A potência de classificação na artéria femoral foi de 5-HT > FC para as respostas contráteis. Em tecidos contraídos com 5-HT, as respostas de relaxamento ao isoproterenol foram praticamente abolidas em comparação aos tecidos contraídos com FC. A forskolina, um estimulante da adenilil ciclase, restaurou parcialmente a resposta de relaxamento ao ISO em tecidos contraídos com 5-HT. CONCLUSÃO: Ocorre uma interação entre as vias de sinalização dos receptores β-adrenérgicos e serotoninérgicos na artéria femoral. Além disso, esta pesquisa fornece um novo modelo para estudar as vias de sinalização serotoninérgicas em condições normais e patológicas que podem ajudar a compreender os resultados clínicos na DAP.

BACKGROUND: Coronary heart disease has been widely studied in cardiovascular research. However, patients with peripheral artery disease (PAD) have worst outcomes compared to those with coronary artery disease. Therefore, pharmacological studies using femoral artery are highly relevant for a better understanding of the pathophysiologic responses of the PAD. OBJECTIVE: The aim of this study was to evaluate the pharmacologic properties of the contractile and relaxing agents in rat femoral artery. METHODS: Concentration response curves to the contractile phenylephrine (PE) and serotonin (5-HT) and the relaxing agents isoproterenol (ISO) and forskolin were obtained in isolated rat femoral artery. For relaxing responses, tissues were precontracted with PE or 5-HT. RESULTS: The order rank potency in femoral artery was 5-HT > PE for contractile responses. In tissues precontracted with 5-HT, relaxing responses to isoproterenol was virtually abolished as compared to PE-contracted tissues. Forskolin, a stimulant of adenylyl cyclase, partially restored the relaxing response to ISO in 5-HT-precontracted tissues. CONCLUSION: An interaction between β-adrenergic- and serotoninergic- receptors signaling pathway occurs in femoral artery. Moreover, this study provides a new model to study serotoninergic signaling pathway under normal and pathological conditions which can help understanding clinical outcomes in the PAD.

FUNDAMENTO: La enfermedad coronaria ha sido ampliamente estudiada en las investigaciones cardiovasculares. Sin embargo, los pacientes con enfermedad arterial periférica (EAP), tienen los peores resultados en comparación con aquellos con la enfermedad arterial coronaria. Por tanto, los estudios farmacológicos con la arteria femoral son extremadamente importantes para obtener una mejor comprensión de las respuestas clínicas y fisiopatológicas de la EAP. OBJETIVO: Evaluar las propiedades farmacológicas de los agentes contráctiles y relajantes en la arteria femoral de los ratones. MÉTODOS: Las curvas de concentración-respuesta a los agentes conctráctiles fenilefrina (FE) y a la serotonina (5-HT) y los agentes relajantes isoproterenol (ISO) y forskolina, se obtuvieron en la arteria femoral de ratones ya aislada. Para las respuestas a la relajación, los tejidos fueron contraídos con FE o 5-HT. RESULTADOS: La potencia de clasificación en la arteria femoral fue de 5-HT > FE para las respuestas contráctiles. En los tejidos contraídos con 5-HT, las respuestas de relajación al isoproterenol fueron prácticamente eliminadas en comparación con los tejidos contraídos con FE. La forskolina, un estimulante de la adenilil ciclasa, restauró parcialmente la respuesta de relajación al ISO en los tejidos contraídos con 5-HT. CONCLUSIÓN: Ocurre una interacción entre las vías de señalización de los receptores β-adrenérgicos y serotoninérgicos en la arteria femoral. Además, esa investigación suministra un nuevo modelo para estudiar las vías de señalización serotoninérgicas en condiciones normales y patológicas que puedan ayudar a comprender los resultados clínicos en la EAP.

Ischemia-modified albumin in type 2 diabetic patients with and without peripheral arterial disease

OBJECTIVE: To determine whether there is an association between serum ischemia-modified albumin and the risk factor profile in type 2 diabetic patients with peripheral arterial disease and to identify the risk markers for peripheral arterial disease. METHODS: Participants included 290 patients (35.2 percent women) with type 2 diabetes. The ankle-brachial pressure index was measured using a standard protocol, and peripheral arterial disease was defined as an ankle-brachial index <0.90 or >1.3. The basal ischemia-modified albumin levels and clinical parameters were measured and analyzed. The risk factors for peripheral arterial disease were examined by multiple logistic analyses. RESULTS: Age, systolic blood pressure, total cholesterol, low-density lipoprotein cholesterol, urine albumin, homocysteine, and ischemia-modified albumin were significantly higher in patients with peripheral arterial disease than in disease-free patients (p<0.05), while ankle-brachial index was lower in the former group (p<0.05). Ischemia-modified albumin was positively associated with HbA1c and homocysteine levels (r = 0.220, p = 0.030; r = 0.446, p = 0.044, respectively), while no correlation was found with ankle-brachial index. Multiple logistic analyses indicated that HbA1c, systolic blood pressure, homocysteine and ischemia-modified albumin were independent risk factors for peripheral arterial disease in the diabetic subjects. CONCLUSION: The baseline ischemia-modified albumin levels were significantly higher and positively associated with HbA1c and homocysteine levels in type 2 diabetic patients with peripheral arterial disease. Ischemia-modified albumin was a risk marker for peripheral arterial disease. Taken together, these results might be helpful for monitoring diabetic peripheral arterial disease.