Evaluation of the Effects of a Pinus Brutia Bark Extract on Biochemical Parameters and Blood Pressure in an Experimental Arterial Hypertension

2018 ◽  
Vol 69 (7) ◽  
pp. 1718-1721 ◽  
Author(s):  
Catrinel Florentina Paduraru(Giurescu Bedreag) ◽  
Nina Filip ◽  
Adriana Trifan ◽  
Sorin Dan Miron ◽  
Codruta Badescu ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Arterial Hypertension ◽  
Biochemical Parameters ◽  
Bark Extract ◽  
Pinus Brutia ◽  
Target Organs ◽  
Induced Hypertension ◽  
Oxidative Effects ◽  
And Oxidative Stress

The new hypertension therapies which are thought to improve the mechanisms impairing the target organs in arterial hypertension (AHT) would have great practical value. The aim of our study was to investigate the effects of Pinus brutia bark extract (EPb) on serum lipid profiles and oxidative stress in N(G)-Nitro-L-arginine-methyl ester (L-NAME)-induced hypertension. The experiment demonstrated that PbE improved lipid profile and reduced pro-oxidative effects of L-NAME, thus suggesting a possible role of the extract in the management of AHT. Systolic and diastolic blood pressure decrease was significant in the group undergoing simultaneous EPb extract and L-NAME therapy, as compared to the group that was administered only L-NAME. Due to its effects, the Pinus brutia bark extract may be used for the prophylaxis and as adjuvant therapy of cardiovascular conditions.

scholarly journals Endothelial Dysfunction in Experimental Models of Arterial Hypertension: Cause or Consequence?

2014 ◽  
Vol 2014 ◽  
pp. 1-14 ◽  
Author(s):  
Iveta Bernatova
Keyword(s):  
Nitric Oxide ◽  
Blood Pressure ◽  
Endothelial Dysfunction ◽  
Arterial Hypertension ◽  
Mechanisms Of Action ◽  
Experimental Models ◽  
Experimental Hypertension ◽  
Vascular Bed ◽  
Induced Hypertension

Hypertension is a risk factor for other cardiovascular diseases and endothelial dysfunction was found in humans as well as in various commonly employed animal experimental models of arterial hypertension. Data from the literature indicate that, in general, endothelial dysfunction would not be the cause of experimental hypertension and may rather be secondary, that is, resulting from high blood pressure (BP). The initial mechanism of endothelial dysfunction itself may be associated with a lack of endothelium-derived relaxing factors (mainly nitric oxide) and/or accentuation of various endothelium-derived constricting factors. The involvement and role of endothelium-derived factors in the development of endothelial dysfunction in individual experimental models of hypertension may vary, depending on the triggering stimulus, strain, age, and vascular bed investigated. This brief review was focused on the participation of endothelial dysfunction, individual endothelium-derived factors, and their mechanisms of action in the development of high BP in the most frequently used rodent experimental models of arterial hypertension, including nitric oxide deficient models, spontaneous (pre)hypertension, stress-induced hypertension, and selected pharmacological and diet-induced models.

Cardiac baroreflex dysfunction in patients with pulmonary arterial hypertension at rest and during orthostatic stress: Role of the peripheral chemoreflex

2021 ◽  
Author(s):  
Marcelle Paula-Ribeiro ◽  
Indyanara C. Ribeiro ◽  
Liliane C. Aranda ◽  
Talita M. Silva ◽  
Camila M. Costa ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Pulmonary Arterial Hypertension ◽  
Arterial Hypertension ◽  
Early Stage ◽  
Pressure Fluctuations ◽  
Sit To Stand ◽  
Peak Aerobic Capacity ◽  
Pulmonary Arterial ◽  
Peripheral Chemoreflex

The baroreflex integrity in early-stage pulmonary arterial hypertension (PAH) remains uninvestigated. A potential baroreflex impairment could be functionally relevant and possibly mediated by enhanced peripheral chemoreflex activity. Thus, we investigated 1) the cardiac baroreflex in non-hypoxemic PAH; 2) the association between baroreflex indexes and peak aerobic capacity (i.e., V̇O2peak); and 3) the peripheral chemoreflex contribution to the cardiac baroreflex. Nineteen patients and 13 age- and sex-matched healthy adults (HA) randomly inhaled either 100% O2 (peripheral chemoreceptors inhibition) or 21% O2 (control session), while at rest and during a repeated sit-to-stand maneuver. Beat-by-beat analysis of R-R intervals and systolic blood pressure provided indexes of cardiac baroreflex sensitivity (cBRS) and effectiveness (cBEI). The PAH group had lower cBEIALL at rest (mean ± SD: PAH = 0.5 ± 0.2 vs HA = 0.7 ± 0.1 a.u., P = 0.02) and lower cBRSALL (PAH = 6.8 ± 7.0 vs HA = 9.7 ± 5.0 ms mmHg-1, P < 0.01) and cBEIALL (PAH = 0.4 ± 0.2 vs HA= 0.6 ± 0.1 a.u., P < 0.01) during the sit-to-stand maneuver versus the HA group. The cBEI during the sit-to-stand maneuver was independently correlated to V̇O2peak (partial r = 0.45, P < 0.01). Hyperoxia increased cBRS and cBEI similarly in both groups at rest and during the sit-to-stand maneuver. Therefore, cardiac baroreflex dysfunction was observed under spontaneous and, most notably, provoked blood pressure fluctuations in non-hypoxemic PAH, was not influenced by the peripheral chemoreflex, and was associated with lower V̇O2peak suggesting it could be functionally relevant.

scholarly journals The Key Role of Ambulatory Blood Pressure Monitoring in the Detection of Masked Hypertension and Other Phenomena in Frail Geriatric Patients

Medicina ◽  
2021 ◽  
Vol 57 (11) ◽  
pp. 1221
Author(s):  
Marek Koudelka ◽  
Eliška Sovová
Keyword(s):  
Blood Pressure ◽  
Arterial Hypertension ◽  
Ambulatory Blood Pressure Monitoring ◽  
Ambulatory Blood Pressure ◽  
Geriatric Patients ◽  
Blood Pressure Monitoring ◽  
Target Range ◽  
Masked Hypertension ◽  
Pressure Monitoring

Background and Objectives: This study aims to determine prevalence of masked uncontrolled hypertension (MUH) in frail geriatric patients with arterial hypertension and thus show the role of ambulatory blood pressure monitoring (ABPM) since hypertension occurs in more than 80% of people 60+ years and cardiovascular diseases are the main cause of death worldwide. Despite modern pharmacotherapy, use of combination therapy and normal office blood pressure (BP), patients’ prognoses might worsen due to inadequate therapy (never-detected MUH). Materials and Methods: 118 frail geriatric patients (84.2 ± 4.4 years) treated for arterial hypertension with office BP < 140/90 mmHg participated in the study. 24-h ABPM and clinical examination were performed. Results: Although patients were normotensive in the office, 24-h measurements showed that BP values in 72% of hypertensives were not in the target range: MUH was identified in 47 (40%) patients during 24 h, in 48 (41%) patients during daytime and nocturnal hypertension in 60 (51%) patients. Conclusions: ABPM is essential for frail geriatric patients due to high prevalence of MUH, which cannot be detected based on office BP measurements. ABPM also helps to detect exaggerated morning surge, isolated systolic hypertension, dipping/non-dipping, and set and properly manage adequate treatment, which reduces incidence of cardiovascular events and contributes to decreasing the financial burden of society.

scholarly journals Role of myosin light chain kinase in regulation of basal blood pressure and maintenance of salt-induced hypertension

2011 ◽  
Vol 301 (2) ◽  
pp. H584-H591 ◽  
Author(s):  
Wei-Qi He ◽  
Yan-Ning Qiao ◽  
Cheng-Hai Zhang ◽  
Ya-Jing Peng ◽  
Chen Chen ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Smooth Muscle ◽  
Light Chain ◽  
Myosin Light Chain Kinase ◽  
Myosin Light Chain ◽  
Vascular Tone ◽  
Induced Hypertension ◽  
Basal Blood Pressure ◽  
Muscle Myosin

Vascular tone, an important determinant of systemic vascular resistance and thus blood pressure, is affected by vascular smooth muscle (VSM) contraction. Key signaling pathways for VSM contraction converge on phosphorylation of the regulatory light chain (RLC) of smooth muscle myosin. This phosphorylation is mediated by Ca2+/calmodulin-dependent myosin light chain kinase (MLCK) but Ca2+-independent kinases may also contribute, particularly in sustained contractions. Signaling through MLCK has been indirectly implicated in maintenance of basal blood pressure, whereas signaling through RhoA has been implicated in salt-induced hypertension. In this report, we analyzed mice with smooth muscle-specific knockout of MLCK. Mesenteric artery segments isolated from smooth muscle-specific MLCK knockout mice (MLCKSMKO) had a significantly reduced contractile response to KCl and vasoconstrictors. The kinase knockout also markedly reduced RLC phosphorylation and developed force. We suggest that MLCK and its phosphorylation of RLC are required for tonic VSM contraction. MLCKSMKO mice exhibit significantly lower basal blood pressure and weaker responses to vasopressors. The elevated blood pressure in salt-induced hypertension is reduced below normotensive levels after MLCK attenuation. These results suggest that MLCK is necessary for both physiological and pathological blood pressure. MLCKSMKO mice may be a useful model of vascular failure and hypotension.

scholarly journals Genetic and genomic evidence for an important role of the Na+/H+ exchanger 3 in blood pressure regulation and angiotensin II-induced hypertension

2019 ◽  
Vol 51 (4) ◽  
pp. 97-108 ◽  
Author(s):  
Xiao C. Li ◽  
Xiaowen Zheng ◽  
Xu Chen ◽  
Chunling Zhao ◽  
Dongmin Zhu ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Angiotensin Ii ◽  
Proximal Tubule ◽  
Proximal Tubules ◽  
Ang Ii ◽  
Pressure Regulation ◽  
Blood Pressure Homeostasis ◽  
Induced Hypertension ◽  
Basal Blood Pressure

The sodium (Na+)/hydrogen (H+) exchanger 3 (NHE3) and sodium-potassium adenosine triphosphatase (Na+/K+-ATPase) are two of the most important Na+ transporters in the proximal tubules of the kidney. On the apical membrane side, NHE3 primarily mediates the entry of Na+ into and the exit of H+ from the proximal tubules, directly and indirectly being responsible for reabsorbing ~50% of filtered Na+ in the proximal tubules of the kidney. On the basolateral membrane side, Na+/K+-ATPase serves as a powerful engine driving Na+ out of, while pumping K+ into the proximal tubules against their concentration gradients. While the roles of NHE3 and Na+/K+-ATPase in proximal tubular Na+ transport under in vitro conditions are well recognized, their respective contributions to the basal blood pressure regulation and angiotensin II (ANG II)-induced hypertension remain poorly understood. Recently, we have been fortunate to be able to use genetically modified mouse models with global, kidney- or proximal tubule-specific deletion of NHE3 to directly determine the cause and effect relationship between NHE3, basal blood pressure homeostasis, and ANG II-induced hypertension at the whole body, kidney and/or proximal tubule levels. The purpose of this article is to review the genetic and genomic evidence for an important role of NHE3 with a focus in the regulation of basal blood pressure and ANG II-induced hypertension, as we learned from studies using global, kidney- or proximal tubule-specific NHE3 knockout mice. We hypothesize that NHE3 in the proximal tubules is necessary for maintaining basal blood pressure homeostasis and the development of ANG II-induced hypertension.

scholarly journals Approaches to the Diagnosis and Treatment of Arterial Hypertension in the Light of European Recommendations

Kardiologiia ◽  
2019 ◽  
Vol 59 (9) ◽  
pp. 64-70
Author(s):  
V. N. Larina ◽  
B. Ya. Bart ◽  
E. A. Vartanian ◽  
E. V. Fedorova ◽  
M. P. Mikhailusova ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Cardiovascular Risk ◽  
Drug Treatment ◽  
Arterial Hypertension ◽  
European Society ◽  
Initial Therapy ◽  
Ambulatory Bp Monitoring ◽  
Single Pill ◽  
European Society Of Cardiology

In this review we present analysis the European recommendations on hypertension – what’s new and what has changed in the tactics of managing patients with arterial hypertension (AH). We compared recommendations on hypertension of the European Society of Cardiology (ESC) and the European Society of hypertension (ESH) 2018 with European recommendations of previous years. In the updated version of guidelines, it is still recommended to determine AH as blood pressure (BP) ≥140 and / or ≥90 mm Hg; to subdivide BP levels into optimal, normal, and high normal, to classify severity of AH as 3 degrees, and to distinguish separately its isolated systolic form. Values for out-of-office BP remained unchanged, but recommendations emerged concerning wider use of ambulatory BP monitoring and self-measurement of BP. For initial therapy, it was recommended to use two drugs combinations preferably as single pill combinations. An increase of the role of nurses and pharmacists in teaching, supporting patients and controlling hypertension has been noted. This can improve the achievement of target BP and, as a result, reduce the cardiovascular risk. New European recommendations highlight the modern aspects of classification and diagnosis of AH, main stages of screening, and algorithm of drug treatment of AH.

Sign in / Sign up

Export Citation Format

Share Document