Publications by authors named "Surya Ayalasomayajula"

The electrochemical response characteristics of existing and emerging porous electrode theory (PET) models was benchmarked to establish a common basis to assess their physical reaches, limitations, and accuracy. Three open source PET models: dualfoil, MPET, and LIONSIMBA were compared to simulate the discharge of a LiMnO-graphite cell against experimental data. For C-rates below 2C, the simulated discharge voltage curves matched the experimental data within 4% deviation for dualfoil, MPET, and LIONSIMBA, while for C-rates above 3C, dualfoil and MPET show smaller deviations, within 5%, against experiments.

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Vericiguat, a novel soluble guanylate cyclase (sGC) stimulator, is approved for the treatment of heart failure (HF) with reduced ejection fraction (HFrEF). Decreased nitric oxide (NO) availability, sGC desensitization to NO, sGC deficiency, and reduced cyclic guanosine monophosphate (cGMP) signaling are potential contributing factors for HF disease progression. Vericiguat works via stimulation of sGC in the critical NO-sGC-cGMP pathway.

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The quantification of microstructural properties to optimize battery design and performance, to maintain product quality, or to track the degradation of LIBs remains expensive and slow when performed through currently used characterization approaches. In this paper, a convolution neural network-based deep learning approach (CNN) is reported to infer electrode microstructural properties from the inexpensive, easy to measure cell voltage versus capacity data. The developed framework combines two CNN models to balance the bias and variance of the overall predictions.

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Purpose: Sacubitril/valsartan (LCZ696) and nitroglycerin share the second messenger cGMP and lower blood pressure. Given the potential for co-administration of both drugs in patients with heart failure, this study was designed to investigate the potential for a pharmacodynamic drug interaction affecting blood pressure.

Methods: In this double-blind, placebo-controlled, randomised, crossover study, 40 healthy subjects received sacubitril/valsartan 200 mg bid (97/103 mg bid) or placebo for 5 days.

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Aims: Sacubitril/valsartan is indicated for the treatment of heart failure and reduced ejection fraction (HFrEF). Furosemide, a loop diuretic commonly used for the treatment of HFrEF, may be coadministered with sacubitril/valsartan in clinical practice. The effect of sacubitril/valsartan on the pharmacokinetics and pharmacodynamics of furosemide was evaluated in this open label, two-period, single-sequence study in healthy subjects.

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Sacubitril/valsartan (LCZ696) is indicated for the treatment of heart failure with reduced ejection fraction. Absorption of sacubitril/valsartan and conversion of sacubitril (prodrug) to sacubitrilat (neprilysin inhibitor) was rapid with maximum plasma concentrations of sacubitril, sacubitrilat, and valsartan (angiotensin receptor blocker) reaching within 0.5, 1.

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Sacubitril/valsartan (LCZ696) is indicated for the treatment of heart failure with reduced ejection fraction. Absorption of sacubitril/valsartan and conversion of sacubitril (prodrug) to sacubitrilat (neprilysin inhibitor) was rapid with maximum plasma concentrations of sacubitril, sacubitrilat, and valsartan (angiotensin receptor blocker) reaching within 0.5, 1.

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Sacubitril/valsartan (LCZ696) has been approved for the treatment of heart failure. Sacubitril is an in vitro inhibitor of organic anion-transporting polypeptides (OATPs). In clinical studies, LCZ696 increased atorvastatin C by 1.

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Objective: Sacubitril/valsartan (LCZ696) provides a novel therapeutic approach of neurohormonal modulation in heart failure via simultaneous inhibition of neprilysin and blockade of the angiotensin II type-1 receptor. This study was conducted to evaluate the effect of food on the oral bioavailability of LCZ696 analytes.

Materials And Methods: This was an open-label, randomized, 3-period crossover study in healthy subjects.

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Background And Objectives: LCZ696 (sacubitril/valsartan) is a novel angiotensin receptor neprilysin inhibitor (ARNI) that has been developed for treatment of heart failure patients with reduced ejection fraction and approved in the US, Europe, and many other countries.

Methods: This randomized, placebo-controlled study was conducted in healthy Japanese male subjects (N = 50) to assess the pharmacokinetics and safety of single ascending oral doses (20-600 mg) of LCZ696. Food effect was also evaluated following administration of 200 mg dose.

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Background And Objective: LCZ696 (sacubitril/valsartan), a novel angiotensin receptor neprilysin inhibitor has been recently approved for the treatment of patients with heart failure (HF) and reduced ejection fraction. As several HF patients are likely to use statins as co-medications, the potential for a pharmacokinetic drug-drug interaction between atorvastatin and LCZ696 was evaluated.

Methods: This was an open-label, three-period, single-sequence study in 28 healthy Chinese male subjects wherein LCZ696 200 mg was administered twice daily for 5 days in period 1.

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Purpose: LCZ696 (sacubitril/valsartan), an angiotensin receptor neprilysin inhibitor, is indicated for chronic heart failure (HF) and reduced ejection fraction (HFrEF) to reduce the risk of cardiovascular death and hospitalization for HF. Following oral administration, LCZ696 provides systemic exposure to valsartan and sacubitril (a prodrug), and its metabolite sacubitrilat (the active neprilysin inhibitor, formerly named as LBQ657), which is eliminated primarily via renal route. Since renal dysfunction is a common comorbidity in patients with HF, two open-label studies assessing the effect of mild, moderate, and severe renal impairment were conducted.

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Aims: Concomitant renin-angiotensin-aldosterone system blockade and natriuretic peptide system enhancement may provide unique therapeutic benefits to patients with heart failure and reduced ejection fraction (HFrEF). This study assessed the pharmacodynamics and pharmacokinetics of LCZ696 in patients with HFrEF.

Methods: This was an open-label, noncontrolled single-sequence study.

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Background And Objective: Sacubitril/valsartan (LCZ696) is a first-in-class angiotensin receptor neprilysin inhibitor (ARNI) and has been recently approved in several countries for the treatment of patients with heart failure and reduced ejection fraction. This was the first study conducted to characterise the pharmacokinetics of LCZ696 analytes (pro-drug sacubitril, active neprilysin inhibitor LBQ657 and valsartan) after single-dose administration of LCZ696 in healthy Chinese subjects.

Methods: In this open-label, randomised, parallel-group study, following screening and baseline evaluation, eligible healthy subjects received single oral doses of LCZ696 50, 100, 200 or 400 mg.

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Aims: LCZ696 (angiotensin receptor neprilysin inhibitor) is a novel drug developed for the treatment of heart failure with reduced ejection fraction. Neprilysin is one of multiple enzymes degrading amyloid-β (Aβ). Its inhibition may increase Aβ levels.

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Pradigastat, a diacylglycerol acyltransferase 1 inhibitor, is being developed for the treatment of familial chylomicronemia syndrome. The results of two studies that evaluated the effect of food on the oral bioavailability of pradigastat using randomized, open-label, parallel group designs in healthy subjects (n=24/treatment/study) are presented. In study 1, a single dose of 20 mg pradigastat was administered under the fasted condition or with a high-fat meal.

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Purpose: The purpose of this study was to evaluate the effect of pradigastat, a diacylglycerol acyltransferase-1 inhibitor, on the pharmacokinetics of acetaminophen, a gastric emptying marker.

Methods: Twenty-five healthy subjects were enrolled and received 1000 mg acetaminophen with meal in period 1, pradigastat (100 mg × 3 days followed by 40 mg × 7 days, 1 h before meal) in period 2, and 1000 mg acetaminophen at -2, -1, 0, +1, and +3 h with respect to meal timing in presence of steady-state pradigastat (40-mg maintenance dose) during periods 3-7.

Results: The geometric mean ratio and 90% confidence interval of Cmax and AUC of acetaminophen were within 80-125% suggesting that the rate ad extent of acetaminophen were not affected when given at various time points with respect to pradigastat/meal timing.

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A double fixed dose combination of amlodipine/valsartan and triple fixed dose combination of amlodipine/valsartan/HCTZ tablets have been developed to treat patients with moderate-to-severe hypertension. Here, we present the effect of food on the oral bioavailability of these two fixed dose combination tablets from two separate clinical studies in healthy subjects. Single oral doses of amlodipine/valsartan (10/160 mg) and amlodipine/valsartan/HCTZ (10/320/25 mg were administered under fasted or fed conditions.

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L-4F, an apolipoprotein A-I (apoA-I) mimetic peptide (also known as APL180), was administered daily by either intravenous (IV) infusion for 7 days or by subcutaneous (SC) injection for 28 days in patients with coronary heart disease in two distinct clinical studies. L-4F was well tolerated at all doses tested. Despite achieving plasma levels (mean maximal plasma concentration of 2,907 ng/ml and 395 ng/ml, following IV infusion and SC injection, respectively), that were effective in previously published animal models, treatment with L-4F, as assessed by biomarkers of HDL function such as HDL-inflammatory index (HII), and paraoxonase activity, did not improve.

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The steady-state pharmacokinetic (PK) interaction potential between amlodipine (10 mg), valsartan (320 mg), and hydrochlorothiazide (HCTZ; 25 mg) was evaluated in patients with hypertension in a multicenter, multiple-dose, open-label, 4-cohort, parallel-group study. Eligible patients were randomly allocated to the dual combination of valsartan + HCTZ, amlodipine + valsartan, or amlodipine + HCTZ and nonrandomly allotted to amlodipine + valsartan + HCTZ triple combination treatment. After 6 days of treatment with a half-maximal dose of different combinations, patients were up-titrated to the maximal drug doses from day 7 through day 17.

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Anion efflux transporters are expected to minimize target tissue delivery of N-[4-(benzoylaminophenyl)sulfonyl]glycine (BAPSG), a novel carboxylic acid aldose reductase inhibitor, which exists as a monocarboxylate anion at physiological conditions. Therefore, the objective of this study was to determine whether BAPSG delivery to various eye tissues including the retina and the brain can be enhanced by probenecid, a competitive inhibitor of anion transporters. To determine the influence of probenecid on eye and brain distribution of BAPSG, probenecid was administered intraperitoneally (120 mg/kg body weight; i.

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Purpose: The purpose of this study was to determine whether fluocinolone inhibits vascular endothelial growth factor (VEGF) expression in a retinal pigment epithelial cell line (ARPE-19) and TNF-alpha-induced angiogenesis in chick chorioallantoic membrane (CAM) assay.

Methods: The dose-dependent effect of fluocinolone (0.0001-1 microM) on VEGF secretion, VEGF mRNA expression, and cytotoxicity was determined in confluent monolayers of ARPE-19 cells using ELISA, RT-PCR, and MTT assay, respectively.

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This multicenter, double-blind study evaluated the effects of aliskiren, a direct renin inhibitor approved for hypertension, on cardiac repolarization and conduction. Healthy volunteers (n = 298) were randomized to aliskiren 300 mg, aliskiren 1200 mg, moxifloxacin 400 mg (positive control), or placebo once daily for 7 days. Digitized electrocardiograms were obtained at baseline and day 7 of treatment over 23 hours postdose.

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Objective: Aliskiren is the first in a new class of orally effective direct renin inhibitors approved for the treatment of hypertension. This multiple-dose study investigated the potential for pharmacokinetic interactions between aliskiren and three drugs, each predominantly eliminated by a different clearance/metabolic pathway: allopurinol (glomerular filtration), celecoxib (cytochrome P450 metabolism) and cimetidine (P-glycoprotein and organic anion/cation transporters).

Research Design And Methods: Three open-label, multiple-dose studies in healthy subjects investigated possible pharmacokinetic interactions between aliskiren 300 mg od and allopurinol 300 mg od (n = 20), celecoxib 200 mg bid (n = 22), or cimetidine 800 mg od (n = 22).

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Background: Vildagliptin is an orally active, potent and selective inhibitor of dipeptidyl peptidase IV (DPP-4), the enzyme responsible for the degradation of incretin hormones. By enhancing prandial levels of incretin hormones, vildagliptin improves glycemic control in type 2 diabetes. Co-administration of vildagliptin and simva statin, an HMG-CoA-reductase inhibitor may be required to treat patients with diabetes and dyslipidemia.

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