CAMILA PAIXAO JORDAO
Projetos de Pesquisa
Unidades Organizacionais
Instituto do Coração, Hospital das Clínicas, Faculdade de Medicina
2 resultados
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- Arterial stiffness and its association with clustering of metabolic syndrome risk factors(2017) LOPES-VICENTE, Wanda R. P.; RODRIGUES, Sara; CEPEDA, Felipe X.; JORDAO, Camila Paixao; COSTA-HONG, Valeria; DUTRA-MARQUES, Akothirene C. B.; CARVALHO, Jefferson C.; ALVES, Maria Janieire N. N.; BORTOLOTTO, Luiz A.; TROMBETTA, Ivani C.Background: Metabolic syndrome (MetS) is associated with structural and functional vascular abnormalities, which may lead to increased arterial stiffness, more frequent cardiovascular events and higher mortality. However, the role played by clustering of risk factors and the combining pattern of MetS risk factors and their association with the arterial stiffness have yet to be fully understood. Age, hypertension and diabetes mellitus seem to be strongly associated with increased pulse wave velocity (PWV). This study aimed at determining the clustering and combining pattern of MetS risk factors and their association with the arterial stiffness in non-diabetic and non-hypertensive patients. Methods: Recently diagnosed and untreated patients with MetS (n = 64, 49 +/- 8 year, 32 +/- 4 kg/m(2)) were selected, according to ATP III criteria and compared to a control group (Control, n = 17, 49 +/- 6 year, 27 +/- 2 kg/m(2)). Arterial stiffness was evaluated by PWV in the carotid-femoral segment. Patients were categorized and analyzed according MetS risk factors clustering (3, 4 and 5 factors) and its combinations. Results: Patients with MetS had increased PWV when compared to Control (7.8 +/- 1.1 vs. 7.0 +/- 0.5 m/s, p < 0.001). In multivariate analysis, the variables that remained as predictors of PWV were age (beta = 0.450, p < 0.001), systolic blood pressure (beta = 0.211, p = 0.023) and triglycerides (beta = 0.212, p = 0.037). The increased number of risk factors reflected in a progressive increase in PWV. When adjusted to systolic blood pressure, PWV was greater in the group with 5 risk factors when compared to the group with 3 risk factors and Control (8.5 +/- 0.4 vs. 7.5 +/- 0.2, p = 0.011 and 7.2 +/- 0.3 m/s, p = 0.012). Similarly, the 4 risk factors group had higher PWV than the Control (7.9 +/- 0.2 vs. 7.2 +/- 0.3, p = 0.047). Conclusions: The number of risk factors seems to increase arterial stiffness. Notably, besides age and increased systolic blood pressure, alterations in the triglycerides worsened the stiffness of large vessels, emphasizing the importance in addressing this risk factor in MetS patients.
- Aerobic Swim Training Restores Aortic Endothelial Function by Decreasing Superoxide Levels in Spontaneously Hypertensive Rats(2017) JORDAO, Camila P.; FERNANDES, Tiago; TANAKA, Leonardo Yuji; BECHARA, Luiz R. Grassmann; SOUSA, Luis Gustavo Oliveira de; OLIVEIRA, Edilamar M.; RAMIRES, Paulo RizzoOBJECTIVE: We aimed to determine whether aerobic training decreases superoxide levels, increases nitric oxide levels, and improves endothelium-dependent vasodilation in the aortas of spontaneously hypertensive rats. METHODS: Spontaneously hypertensive rats (SHR) and Wistar Kyoto rats (WKY) were distributed into 2 groups: sedentary (SHRsd and WKYsd, n=10 each) and swimming-trained (SHRtr, n=10 and WKYtr, n=10, respectively). The trained group participated in training sessions 5 days/week for 1 h/day with an additional work load of 4% of the animal's body weight. After a 10-week sedentary or aerobic training period, the rats were euthanized. The thoracic aortas were removed to evaluate the vasodilator response to acetylcholine (10(-10) to 10(-4) M) with or without preincubation with L-N-G-nitro-L-arginine methyl ester hydrochloride (L-NAME; 10(-4) M) in vitro. The aortic tissue was also used to assess the levels of the endothelial nitric oxide synthase and nicotinamide adenine dinucleotide oxidase subunit isoforms 1 and 4 proteins, as well as the superoxide and nitrite contents. Blood pressure was measured using a computerized tail-cuff system. RESULTS: Aerobic training significantly increased the acetylcholine-induced maximum vasodilation observed in the SHRtr group compared with the SHRsd group (85.9 +/- 4.3 vs. 71.6 +/- 5.2%). Additionally, in the SHRtr group, superoxide levels were significantly decreased, nitric oxide bioavailability was improved, and the levels of the nicotinamide adenine dinucleotide oxidase subunit isoform 4 protein were decreased compared to the SHRsd group. Moreover, after training, the blood pressure of the SHRtr group decreased compared to the SHRsd group. Exercise training had no effect on the blood pressure of the WKYtr group. CONCLUSIONS: In SHR, aerobic swim training decreased vascular superoxide generation by nicotinamide adenine dinucleotide oxidase subunit isoform 4 and increased nitric oxide bioavailability, thereby improving endothelial function.