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https://www.readbyqxmd.com/read/29351473/sympathetically-mediated-cardiac-responses-to-isolated-muscle-metaboreflex-activation-following-exercise-are-modulated-by-body-position-in-humans
#1
André L Teixeira, Mauricio Daher, Mayara Souza, Plinio Santos Ramos, James P Fisher, Lauro C Vianna
Isolated muscle metaboreflex activation with post-handgrip exercise ischemia (PEI) increases sympathetic nerve activity and partially maintains the exercise-induced increase in blood pressure, but a smaller heart rate (HR) response occurs. The cardiopulmonary baroreceptors, mechanically sensitive receptors that respond to changes in central blood volume and pressure, are strongly associated with changes in body position and upon activation elicit reflex sympathoinhibition. Here, we tested the hypothesis that postural changes modulate the sympathetically-mediated cardiac response to PEI in humans...
December 15, 2017: American Journal of Physiology. Heart and Circulatory Physiology
https://www.readbyqxmd.com/read/29332839/magnetic-solid-phase-extraction-based-on-magnetic-multiwalled-carbon-nanotubes-for-the-simultaneous-enantiomeric-analysis-of-five-%C3%AE-blockers-in-the-environmental-samples-by-chiral-liquid-chromatography-coupled-with-tandem-mass-spectrometry
#2
Zhaokun Wang, Xue Zhang, Shenmeng Jiang, Xingjie Guo
In this work, the magnetic multiwalled carbon nanotubes (Mag-MWCNTs) were prepared by self-assembly method and characterized by scanning electron microscopy, X-ray powder diffraction, energy dispersive X-ray and vibrating sample magnetometer. Then, these synthetic Mag-MWCNTs were used as sorbents to extract five β-blockers (atenolol, metoprolol, esmolol, pindolol and arotinolol) by magnetic solid-phase extraction. The target analytes adsorbed on Mag-MWCNTs were eluted and determined on a chiral α-acid glycoprotein column coupled with a triple quadrupole mass spectrometry...
April 1, 2018: Talanta
https://www.readbyqxmd.com/read/29332838/rapid-and-sensitive-tapered-capillary-microextraction-combined-to-on-line-sample-stacking-capillary-electrophoresis-for-extraction-and-quantification-of-two-beta-blockers-in-human-urine
#3
Shucheng Sun, Yujia Wang, Xin Liu, Rao Fu, Li Yang
A tapered-capillary microextraction (tCap-μEx) combining with field-amplified stacking (FASI) method for CE analysis was developed. The tCap-μEx method is based on the construction of a micro solid phase extraction (SPE) column by narrowing the end of a silica capillary from 530µm (inner diameter) to 20µm, enabling the packing of 45µm sorbent particles without a frit. Various parameters that may affect the microextraction and FASI-CE analysis have been investigated and optimized. This study shows that microextraction exhibits advantages of small sample and sorbent volumes (less than 200μL sample and 2μL sorbent) and fast extraction time of 6min...
April 1, 2018: Talanta
https://www.readbyqxmd.com/read/29331270/severe-beta-blocker-and-calcium-channel-blocker-overdose-role-of-high-dose-insulin
#4
Karan Seegobin, Satish Maharaj, Ansuya Deosaran, Pramod Reddy
A 54-year-old female presented after taking an overdose of an unknown amount of hydrochlorothiazide, doxazocin, atenolol and amlodipine. She was initially refractory to treatment with conventional therapy (intravenous fluids, activated charcoal, glucagon 5 mg followed with glucagon drip, calcium gluconate 10%, and atropine). Furthermore, insulin at 4 U/kg was not effective in improving her hemodynamics. Shortly after high dose insulin was achieved with 10 U/kg, there was dramatic improvement in hemodynamics resulting in three of five vasopressors being weaned off in 8 h...
January 10, 2018: American Journal of Emergency Medicine
https://www.readbyqxmd.com/read/29330133/the-evaluation-of-drug-induced-changes-in-left-ventricular-function-in-pentobarbital-anesthetized-dogs
#5
Yevgeniya E Koshman, Brett R Herzberg, Terese R Seifert, James S Polakowski, Scott W Mittelstadt
INTRODUCTION: The goal of this study was to determine whether assessment of myocardial contractility and hemodynamics in an anesthetized dog model, could consistently detect drug-induced changes in the inotropic state of the heart using drugs known to have clinically relevant positive and negative effects on myocardial contractility. METHODS: Derived parameters included: diastolic, systolic and mean arterial BP, peak systolic LVP, HR, end-diastolic LVP, and LVdP/dtmax as the primary contractility index...
January 9, 2018: Journal of Pharmacological and Toxicological Methods
https://www.readbyqxmd.com/read/29248973/alteration-of-serum-immunoglobins-c-reactive-protein-vitamin-d-and-electrolyte%C3%A2-by-atenolol-and-amlodipine-in-stress-induced-hypertensive-rats
#6
Moayad Mustafa Hejazi, Ala Osman Bacha, Mohammed Kaleemuddin, Fahad A Al-Abassi, Abdulbasit I Al-Alsieni, Imran Kazmi, Firoz Anwar
The present study is designed for the assessment of various pathological changes like immunoglobins, C-reactive protein, vitamin D, sodium, potassium, calcium in stress-induced hypertensive rats. Albino Wistar rats of sex male were grouped into six. Each group consists of six animals. Groups were Group I (normal control), Group II (disease control), Group III (amlodipine control), Group IV (atenolol control), Group V (amlodipine treatment), and Group VI (atenolol treatment). Group II, V, and VI animals exposed to regular stress by placing them in cages individually and giving foot electric shocks (1 mA, 50 ms duration with 0...
December 16, 2017: Molecular and Cellular Biochemistry
https://www.readbyqxmd.com/read/29241133/oxidation-of-%C3%AE-blockers-by-birnessite-kinetics-mechanism-and-effect-of-metal-ions
#7
Yong Chen, Xiye Lu, Lu Liu, Dong Wan, Huabin Chen, Danna Zhou, Virender K Sharma
Manganese dioxides are ubiquitous in natural waters, soils, and sediments and play an important role in oxidative transformation of organic pollutants. This work presents the kinetics of the oxidation of selected β-blockers, betaxolol, metoprolol, and atenolol by birnessite (δ-MnO2) as a function of concentration of the β-blocker, dosage of δ-MnO2, and solution pH. The values of pseudo-first-order rate constants (kobs) of β-blockers decreased in the order betaxolol > atenolol > metoprolol, which was positively correlated with their acid dissociation constants (Ka)...
December 6, 2017: Chemosphere
https://www.readbyqxmd.com/read/29236801/effect-of-atenolol-pre-treatment-in-heart-damage-in-a-model-of-intestinal-ischemia-reperfusion
#8
Mieko Okada, Luiz Fernando Reis Falcão, David Ferez, José Luiz Martins, Paolo Ruggero Errante, Francisco Sandro Menezes Rodrigues, Afonso Caricati-Neto, Márcia Marinho, Guilherme Fenelon, Itamar Souza
PURPOSE: To investigate the effects of atenolol in inflammatory mediator and oxidative stress in a myocardial injury by intestinal ischemia/reperfusion in rat model. METHODS: Adult Wistar male rats were randomly (n=8), anesthetized and divided in: Sham: submitted to operation only; group SS+IR: intravenous saline infusion following superior mesenteric artery occlusion during 60 minutes (ischemia) and open for 120 minutes (reperfusion); group AT+IR: intravenous atenolol infusion (2 mg/kg) following superior mesenteric artery occlusion during 60 minutes (ischemia) and open for 120 minutes (reperfusion); and group AT+I+AT+R: intravenous atenolol infusion following superior mesenteric artery occlusion during 60 minutes (ischemia) and in the time 45 minutes other atenolol doses were administrated and the artery was open for 120 minutes (reperfusion), all animals were submitted to muscular relaxation for mechanical ventilation...
November 2017: Acta Cirúrgica Brasileira
https://www.readbyqxmd.com/read/29232287/the-effects-of-known-cardioprotective-drugs-on-proinflammatory-cytokine-secretion-from-human-coronary-artery-endothelial-cells
#9
Michael J Haas, Marilu Jurado-Flores, Ramadan Hammoud, Victoria Feng, Krista Gonzales, Luisa Onstead-Haas, Arshag D Mooradian
BACKGROUND: Endothelial cell dysfunction in diabetes is involved in the pathogenesis and progression of premature atherosclerosis. High-dextrose has been shown to induce both oxidative stress and endoplasmic reticulum stress in cultured human coronary artery endothelial cells (HCAEC). STUDY QUESTION: To determine whether or not several classes of cardioprotective drugs inhibit proinflammatory cytokine expression by HCAEC. MEASURES AND OUTCOMES: To determine the effects of high dextrose on expression of proinflammatory cytokines by HCAEC, cells were treated with either 5...
November 27, 2017: American Journal of Therapeutics
https://www.readbyqxmd.com/read/29216899/generic-reference-and-generic-generic-bioequivalence-of-forty-two-randomly-selected-on-market-generic-products-of-fourteen-immediate-release-oral-drugs
#10
Muhammad M Hammami, Sophia J S De Padua, Rajaa Hussein, Eman Al Gaai, Nesrine A Khodr, Reem Al-Swayeh, Syed N Alvi, Nada Binhashim
BACKGROUND: The extents of generic-reference and generic-generic average bioequivalence and intra-subject variation of on-market drug products have not been prospectively studied on a large scale. METHODS: We assessed bioequivalence of 42 generic products of 14 immediate-release oral drugs with the highest number of generic products on the Saudi market. We conducted 14 four-sequence, randomized, crossover studies on the reference and three randomly-selected generic products of amlodipine, amoxicillin, atenolol, cephalexin, ciprofloxacin, clarithromycin, diclofenac, ibuprofen, fluconazole, metformin, metronidazole, paracetamol, omeprazole, and ranitidine...
December 8, 2017: BMC Pharmacology & Toxicology
https://www.readbyqxmd.com/read/29198406/comparison-of-the-effect-of-aliskiren-versus-negative-controls-on-aortic-stiffness-in-patients-with-marfan-syndrome-under-treatment-with-atenolol
#11
Ji-Won Hwang, Eun Kyoung Kim, Shin Yi Jang, Tae-Young Chung, Chang-Seok Ki, Kiick Sung, Sung Mok Kim, Joonghyun Ahn, Keumhee Carriere, Yeon Hyeon Choe, Sung-A Chang, Duk-Kyung Kim
INTRODUCTION AND OBJECTIVES: The aim of this study was to evaluate the effect of aliskiren on aortic stiffness in patients with Marfan syndrome (MS). METHODS: Twenty-eight MS patients (mean age ± standard deviation: 32.6 ± 10.6 years) were recruited from November 2009 to October 2014. All patients were receiving atenolol as standard beta-blocker therapy. A prospective randomization process was performed to assign participants to either aliskiren treatment (150-300mg orally per day) or no aliskiren treatment (negative control) in an open-label design...
November 29, 2017: Revista Española de Cardiología
https://www.readbyqxmd.com/read/29197284/detection-of-ppcps-in-marine-organisms-from-contaminated-coastal-waters-of-the-saudi-red-sea
#12
Aasim M Ali, Helene Thorsen Rønning, Leiv K Sydnes, Walied M Alarif, Roland Kallenborn, Sultan S Al-Lihaibi
The occurrence of PPCPs in macroalgae, barnacle and fish samples from contaminated coastal waters of the Saudi Red Sea is reported. Solvent extraction followed by solid phase extraction was applied to isolate the compounds, and their quantification was carried out by high performance liquid chromatography-tandem mass spectrometry. Atenolol, ranitidine, chlorpheniramine, DEET, and atrazine were detected in one or more macroalgae at <LOQ concentration, whereas caffeine, methylparaben, and carbamazepine were present atmaximum concentrations of 41...
November 29, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29192401/spatio-temporal-evaluation-of-emerging-contaminants-and-their-partitioning-along-a-brazilian-watershed
#13
Diana Nara Ribeiro de Sousa, Antonio Aparecido Mozeto, Renato Lajarim Carneiro, Pedro Sergio Fadini
The occurrence, partitioning, and spatio-temporal distribution of seven pharmaceuticals for human use, three steroid hormones and one personal care product were determined in surface water, suspended particulate matter (SPM), and sediment of Piraí Creek and Jundiaí River (Jundiaí River Basin, São Paulo, Brazil). The maximum average detected concentrations of the compounds in the Piraí River samples were < 30 ng L-1, except for caffeine (222 ng L-1). In Jundiaí River samples, most of the compounds were frequently detected, wherein caffeine had the highest concentration, with maximum average concentrations of 14,050 ng L-1, followed by atenolol (431 ng L-1), ibuprofen (268 ng L-1) and diclofenac (214 ng L-1)...
November 30, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29184167/effect-of-nebivolol-or-atenolol-vs-placebo-on-cardiovascular-health-in-subjects-with-borderline-blood-pressure-the-evidence-study
#14
Daniel A Duprez, Natalia Florea, Sue Duval, Catherine Koukol, Jay N Cohn
Pharmacotherapy to protect the arteries may be appropriate for individuals with high-normal blood pressure who are at risk for future cardiovascular disease (CVD). Nebivolol (NEB) in contrast to atenolol (ATE) may have a beneficial effect on endothelial function and may be more effective than ATE in preventing CVD. Sixty subjects with preHTN or borderline BP and abnormal small artery elasticity (SAE) underwent evaluation with 10 tests, including large and small artery elasticity, resting and treadmill exercise BP, carotid intimal-media thickness, retinal vascular photography, micro-albuminuria, electrocardiography, echocardiography, and plasma B-type natriuretic peptide level...
November 28, 2017: Journal of Human Hypertension
https://www.readbyqxmd.com/read/29178678/%C3%AE-%C3%A2-adrenoceptor-blockade-deteriorates-systemic-anaphylaxis-by-enhancing-hyperpermeability-in-anesthetized-mice
#15
Wei Yang, Toshishige Shibamoto, Yuhichi Kuda, Tao Zhang, Mamoru Tanida, Yasutaka Kurata
PURPOSE: Patients treated with propranolol, a nonselective β-adrenoceptor antagonist, develop severe anaphylaxis, but the mechanism remains unknown. We determined effects of β₁- and β₂-adrenoceptor antagonists on the anaphylaxis-induced increase in vascular permeability in mice. METHODS: In anesthetized ovalbumin-sensitized C57BL mice, mean arterial blood pressure (MBP) was measured, and Evans blue dye extravasation and hematocrit (Hct) were assessed at 20 minutes after antigen injection...
January 2018: Allergy, Asthma & Immunology Research
https://www.readbyqxmd.com/read/29176391/the-relationship-of-all-cause-mortality-to-average-on-treatment-systolic-blood-pressure-is-significantly-related-to-baseline-systolic-blood-pressure-implications-for-interpretation-of-the-systolic-blood-pressure-intervention-trial-study
#16
Peter M Okin, Sverre E Kjeldsen, Richard B Devereux
BACKGROUND: The SPRINT study demonstrated that targeting systolic blood pressure (SBP) less than 120 mmHg was associated with lower cardiovascular event and mortality rates. In the LIFE study, however, a lower achieved SBP was associated with increased mortality. Mean baseline SBP in SPRINT was 140 mmHg and a third of the population had a baseline SBP 132 mmHg or less, raising the question of whether the lower baseline SBP in SPRINT could in part account for these differences. METHODS: All-cause mortality during 4...
November 15, 2017: Journal of Hypertension
https://www.readbyqxmd.com/read/29172846/use-of-beta-blockers-is-associated-with-hearing-loss
#17
Bandar Saeed Al-Ghamdi, Dileep Kumar Rohra, Gheid Ali Ibrahim Abuharb, Hala Abdulrahman Alkofide, Nadiah Salem AlRuwaili, Mohamed M Shoukri, Peter M B Cahusac
OBJECTIVE: This study was conducted to investigate the hypothesis that patients using β-blockers will develop hearing loss. DESIGN: A cross-sectional study. STUDY SAMPLE: A total of 125 patients completed the study. A total of 63 patients were on β-blockers and 62 were not on β-blockers. RESULTS: Carvedilol was significantly associated with hearing loss. Other beta-blockers including metoprolol and atenolol showed no association with hearing loss...
November 24, 2017: International Journal of Audiology
https://www.readbyqxmd.com/read/29171242/-absorption-and-transport-of-isoflavonoid-compounds-from-tongmai-formula-across-human-intestinal-epithelial-caco-2-cells-in-vitro
#18
Fu-Rong Wang, Xiu-Wei Yang
Tongmai formula (TMF) is a drug combination of three components including Puerariae Lobatae Radix [roots of Pueraria lobata], Salviae Miltiorrhizae Radix (roots of Salvia miltiorrhiza) and Chuanxiong Rhizoma (rhizomes of Ligusticum chuanxiong) in a weight ratio of 1∶1∶1. The absorption and transport of isoflavonoid compounds from Tongmai formula across human intestinal epithelial (Caco-2) cells in vitro were studied in this paper. The assay isoflavonoid compounds include daidzein, formononetin, 5-hydroxylononin, ononin, daidzin, 3'-methoxypuerarin, genistin, puerarin, formononetin-8-C-β-D-apiofuranosyl-(1→6)-O-β-D-glucopyranoside, formononetin-7-O-β-D-apiofuranosyl-(1→6)-O-β-D-glucopyranoside, lanceolarin, kakkanin, daidzein-7,4'-di-O-β-D-glucopyranoside, mirificin, 3'-hydroxypuerarin, 3'-methoxydaidzin, formononetin-8-C-β-D-xylopyranosyl-(1→6)-O-β-D-glucopyranoside, genistein-8-C-β-D-apiofuranosyl-(1→6)-O-β-D-glucopyranoside, genistein-7-O-β-D-apiofuranosyl-(1→6)-O-β-D-glucopyranoside (ambocin), 3'-hydroxymirificin, 6″-O-β-D-xylosylpuerarin, biochanin A-8-C-β-D-apiofuranosyl-(1→6)-O-β-D-glucopyranoside, 3'-methoxydaidzein-7,4'-di-O-β-D-glucopyranoside, daidzein-7-O-β-D-glucopyranosyl-(1→4)-O-β-D-glucopyranoside, and daidzein-7-O-α-D-glucopyranosyl-(1→4)-O-β-D-glucopyranoside...
August 2017: Zhongguo Zhong Yao za Zhi, Zhongguo Zhongyao Zazhi, China Journal of Chinese Materia Medica
https://www.readbyqxmd.com/read/29160624/buccal-patches-of-atenolol-formulated-using-fenugreek-trigonella-foenum-graecum-l-seed-mucilage
#19
Surya Narayan Ratha Adhikari, Satyabrata Panda
BACKGROUND: The use of mucoadhesive natural polymers in designing mucoadhesive patch systems has received much attention. OBJECTIVES: The study involved the development and evaluation of buccal patches of atenolol using fenugreek (Trigonella foenum-graecum L.) seed mucilage with hydroxylpropyl methyl cellulose (HPMC K4M) and a backing membrane (ethyl cellulose 5% w/v). MATERIAL AND METHODS: These atenolol-releasing buccal patches were prepared using a solvent casting technique...
January 2017: Polimery W Medycynie
https://www.readbyqxmd.com/read/29151037/combining-ecg-criteria-for-left-ventricular-hypertrophy-improves-risk-prediction-in-patients-with-hypertension
#20
Peter M Okin, Darcy A Hille, Sverre E Kjeldsen, Richard B Devereux
BACKGROUND: Patients with hypertension with ECG left ventricular hypertrophy (LVH) have higher cardiovascular morbidity and mortality, but single ECG criteria may underestimate risk. Whether continued presence or new development of ECG LVH by 2 criteria can further concentrate risk during blood pressure lowering is unclear. METHODS AND RESULTS: Incident stroke, myocardial infarction, cardiovascular death, the composite of these outcomes, and all-cause mortality were examined in relation to the presence of on-treatment ECG LVH by Cornell product and/or Sokolow-Lyon voltage during a mean of 4...
November 18, 2017: Journal of the American Heart Association
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