RESUMO
BACKGROUND: The effectiveness of renal denervation (RDN) in reducing blood pressure and systemic sympathetic activity in hypertensive patients has been established. However, the underlying central mechanism remains unknown. This study aimed to investigate the role of RDN in regulating cardiovascular function via the central renin-angiotensin system (RAS) pathway. METHODS: Ten-week-old spontaneously hypertensive rats (SHR) were subjected to selective afferent renal denervation (ADN) using capsaicin solution. We hypothesized that ADN would effectively reduce blood pressure and rebalance the RAS component of the paraventricular nucleus (PVN) in SHR. RESULTS: The experimental results show that the ADN group exhibited significantly lower blood pressure, reduced systemic sympathetic activity, decreased chronic neuronal activation marker C-FOS expression in the PVN, and improved arterial baroreflex function, compared with the Sham group. Furthermore, ACE and AT1 protein expression was reduced while ACE2 and MAS protein expression was increased in the PVN of SHR after ADN. CONCLUSIONS: These findings suggest that RDN may exert these beneficial effects through modulating the central RAS pathway.
Assuntos
Barorreflexo , Pressão Sanguínea , Hipertensão , Rim , Núcleo Hipotalâmico Paraventricular , Ratos Endogâmicos SHR , Sistema Renina-Angiotensina , Sistema Nervoso Simpático , Animais , Núcleo Hipotalâmico Paraventricular/metabolismo , Núcleo Hipotalâmico Paraventricular/fisiopatologia , Rim/inervação , Rim/metabolismo , Hipertensão/fisiopatologia , Hipertensão/cirurgia , Hipertensão/metabolismo , Sistema Nervoso Simpático/fisiopatologia , Sistema Nervoso Simpático/cirurgia , Sistema Nervoso Simpático/metabolismo , Masculino , Enzima de Conversão de Angiotensina 2/metabolismo , Modelos Animais de Doenças , Proteínas Proto-Oncogênicas c-fos/metabolismo , Proto-Oncogene Mas , Peptidil Dipeptidase A/metabolismo , Simpatectomia/métodos , Receptor Tipo 1 de Angiotensina/metabolismo , Capsaicina/farmacologia , Receptores Acoplados a Proteínas G/metabolismo , RatosRESUMO
BACKGROUND: Exercise prescription of cardiac rehabilitation (CR) is vital in patients with cardiovascular diseases (CVDs) and those carrying high risk for CVDs. However, the relation between the implementation rate of exercise prescription and cardiovascular events (CVEs) is unclear. DESIGN AND METHODS: In this retrospective study, using the administration data from the Rehabilitation Center in a hospital, patients aged ≥18 years with CVDs were consecutively enrolled from November 2018 to May 2021. Patients were divided into the high execution group (HEG) and low execution group (LEG) depending on whether they completed more than half the time of the exercise prescriptions. Baseline characteristics, ultrasonic cardiogram, cardiopulmonary exercise test, follow-up data, and CVEs were collected. RESULTS: The mean age of the 197 CR patients was 61.8 ± 13.7 years and the mean follow-up duration was 10.9 ± 4.2 months. Among them, 15 patients suffered CVEs: 4 in the HEG and 11 in the LEG. The incidence of CVEs showed significant differences between HEG and LEG (chi-square test). Free-event survival analysis using Kaplan-Meier survival plots showed that patients in LEG had poor survival. Cox proportional hazards regression analysis revealed that the prescription implementation rate was an independent predictor of CVEs. CONCLUSIONS: Our study suggested a significant effect of exercise prescription execution rate on the occurrence of CVEs. Further, the HEG of exercise prescription was associated with lower CVDs.
