Full Text Journal Articles by
Author Viswanathan Ramakrishnan

Advertisement

Find full text journal articles






ASSOCIATIONS BETWEEN ACCELERATED ATHEROSCLEROSIS, OXIDIZED LDL IMMUNE COMPLEXES, AND IN VITRO ENDOTHELIAL DYSFUNCTION IN SYSTEMIC LUPUS ERYTHEMATOSUS.

Jim C Oates, Viswanathan Ramakrishnan, Paul J Nietert, J David Spence, Thomas W Fleury, Margaret Markiewicz, Dayvia L Russell, Maria F Lopes-Virella,

Systemic lupus erythematosus (SLE) is an independent risk factor for atherosclerosis. This study was designed to determine the association between atherosclerosis, oxidized LDL immune complexes (oxLDL-IC), and endothelial dysfunction in SLE. SLE patients were recruited, and carotid atherosclerotic total plaque area (TPA) was determined by ultrasound. Levels of oxLDL-IC were ... Read more >>

Trans. Am. Clin. Climatol. Assoc. (Transactions of the American Clinical and Climatological Association)
[2020, 131:157-177]

Cited: 0 times

View full text PDF listing >>



Statistical properties of minimal sufficient balance and minimization as methods for controlling baseline covariate imbalance at the design stage of sequential clinical trials.

Steven D Lauzon, Viswanathan Ramakrishnan, Paul J Nietert, Jody D Ciolino, Michael D Hill, Wenle Zhao,

When the number of baseline covariates whose imbalance needs to be controlled in a sequential randomized controlled trial is large, minimization is the most commonly used method for randomizing treatment assignments. The lack of allocation randomness associated with the minimization method has been the source of controversy, and the need ... Read more >>

Stat Med (Statistics in medicine)
[2020, 39(19):2506-2517]

Cited: 0 times

View full text PDF listing >>



Advertisement

Increases in endogenous progesterone attenuate smoking in a cohort of nontreatment seeking women: An exploratory prospective study.

Nathaniel L Baker, Kevin M Gray, Viswanathan Ramakrishnan, Rachel L Tomko, Erin A McClure, Matthew J Carpenter, Michael E Saladin,

Despite advances in prevention and treatment, cigarette smoking remains a leading cause of preventable death in the United States. Although men and women are equally likely to attempt to quit smoking cigarettes, women are far less likely to achieve abstinence both during and following cessation treatment. Recent evidence suggests that ... Read more >>

Addict Biol (Addiction biology)
[2020, :e12918]

Cited: 0 times

View full text PDF listing >>



Investigation of S-Nitrosoglutathione in stroke: A systematic review and meta-analysis of literature in pre-clinical and clinical research.

Shimeng Liu, Haiqing Zheng, Wengui Yu, Viswanathan Ramakrishnan, Shreyansh Shah, Louis Fernando Gonzalez, Inderjit Singh, Carmelo Graffagnino, Wuwei Feng,

BACKGROUND:S-Nitrosoglutathione (GSNO) is a nitric oxide donor that has been investigated for neuroprotective and neuro-recovery effect. We aimed to conduct a systematic review on the published literatures using GSNO in both pre-clinical and clinical stroke studies. METHODS:We searched PubMed up to June 30, 2019, using the following keywords: S-Nitrosoglutathione, GSNO, ... Read more >>

Exp. Neurol. (Experimental neurology)
[2020, 328:113262]

Cited: 0 times

View full text PDF listing >>



Impact of the Affordable Care Act Medicaid Expansion on Access to Care and Hospitalization Charges for Lupus Patients.

Elizabeth A Brown, Clara E Dismuke-Greer, Viswanathan Ramakrishnan, Trevor D Faith, Edith M Williams,

OBJECTIVE:To examine the impact of the Affordable Care Act on preventable hospitalizations and associated charges for patients living with systemic lupus erythematosus, before and after Medicaid expansion. METHODS:A retrospective, quasi-experimental study, using an interrupted time series research design, was conducted to analyze data for 8 states from the Healthcare Cost ... Read more >>

Arthritis Care Res (Hoboken) (Arthritis care & research)
[2020, 72(2):208-215]

Cited: 0 times

View full text PDF listing >>



Sex Differences in Subjective and Behavioral Responses to Stressful and Smoking Cues Presented in the Natural Environment of Smokers.

Rachel L Tomko, Michael E Saladin, Nathaniel L Baker, Erin A McClure, Matthew J Carpenter, Viswanathan R Ramakrishnan, Bryan W Heckman, Jennifer M Wray, Katherine T Foster, Stephen T Tiffany, Christopher L Metts, Kevin M Gray,

INTRODUCTION:Some evidence suggests that female smokers may show more context-dependent smoking and that males may show more stereotyped smoking (regardless of stress or cue exposure). The goal of this study was to characterize sex differences in response to stressful and smoking cues ecologically presented in daily life and variability in ... Read more >>

Nicotine Tob. Res. (Nicotine & tobacco research : official journal of the Society for Research on Nicotine and Tobacco)
[2020, 22(1):81-88]

Cited: 1 time

View full text PDF listing >>



The influence of gender and oxytocin on stress reactivity, cigarette craving, and smoking in a randomized, placebo-controlled laboratory relapse paradigm.

Erin A McClure, Nathaniel L Baker, Kevin M Gray, Caitlyn O Hood, Rachel L Tomko, Matthew J Carpenter, Viswanathan R Ramakrishnan, Cole J Buchanan, Michael E Saladin,

RATIONALE:Female cigarette smokers tend to show greater cessation failure compared with males. Variables that contribute to the maintenance of smoking, including stress and craving, may differentially impact male and female smokers. Novel pharmacotherapies, such as oxytocin, may attenuate stress reactivity and craving in smokers, but work in this area is ... Read more >>

Psychopharmacology (Berl.) (Psychopharmacology)
[2020, 237(2):543-555]

Cited: 0 times

View full text PDF listing >>



Phase I Safety Trial: Extended Daily Peripheral Sensory Stimulation Using a Wrist-Worn Vibrator in Stroke Survivors.

Na Jin Seo, Leah R Enders, Andrew Fortune, Shannon Cain, Amanda A Vatinno, Eli Schuster, Viswanathan Ramakrishnan, Wuwei Feng,

Peripheral sensory stimulation augments post-stroke upper extremity rehabilitation outcomes. Most sensory stimulations interfere with natural hand tasks and the stimulation duration is limited. We developed TheraBracelet, low-level random-frequency vibration applied via a wristwatch, to enable stimulation during hand tasks and potentially extend stimulation durations. To determine safety of prolonged exposure ... Read more >>

Transl Stroke Res (Translational stroke research)
[2020, 11(2):204-213]

Cited: 0 times

View full text PDF listing >>



Peer approaches to self-management (PALS): comparing a peer mentoring approach for disease self-management in African American women with lupus with a social support control: study protocol for a randomized controlled trial.

Edith M Williams, Leonard Egede, Jim C Oates, Clara L Dismuke, Viswanathan Ramakrishnan, Trevor D Faith, Hetlena Johnson, Jillian Rose,

BACKGROUND:Systemic lupus erythematosus (SLE or lupus) is a chronic autoimmune disease that is associated with increased morbidity, mortality, healthcare costs and decreased quality of life. African Americans in the USA have three to four times greater prevalence of SLE, risk of developing SLE at an earlier age, and SLE-related disease ... Read more >>

Trials (Trials)
[2019, 20(1):529]

Cited: 1 time

View full text PDF listing >>



Capturing Upper Limb Gross Motor Categories Using the Kinect® Sensor.

Na Jin Seo, Vincent Crocher, Egli Spaho, Charles R Ewert, Mojtaba F Fathi, Pilwon Hur, Sara A Lum, Elizabeth M Humanitzki, Abigail L Kelly, Viswanathan Ramakrishnan, Michelle L Woodbury,

IMPORTANCE:Along with growth in telerehabilitation, a concurrent need has arisen for standardized methods of tele-evaluation. OBJECTIVE:To examine the feasibility of using the Kinect sensor in an objective, computerized clinical assessment of upper limb motor categories. DESIGN:We developed a computerized Mallet classification using the Kinect sensor. Accuracy of computer scoring was ... Read more >>

Am J Occup Ther (The American journal of occupational therapy : official publication of the American Occupational Therapy Association)
[2019, 73(4):7304205090p1-7304205090p10]

Cited: 0 times

View full text PDF listing >>



Simulation optimization for Bayesian multi-arm multi-stage clinical trial with binary endpoints.

Zhenning Yu, Viswanathan Ramakrishnan, Caitlyn Meinzer,

Multi-arm multi-stage designs, in which multiple active treatments are compared to a control and accumulated information from interim data are used to add or remove arms from the trial, may reduce development costs and shorten the drug development timeline. As such, this adaptive update is a natural complement to Bayesian ... Read more >>

J Biopharm Stat (Journal of biopharmaceutical statistics)
[2019, 29(2):306-317]

Cited: 0 times

View full text PDF listing >>



TheraBracelet Stimulation During Task-Practice Therapy to Improve Upper Extremity Function After Stroke: A Pilot Randomized Controlled Study.

Na J Seo, Michelle L Woodbury, Leonardo Bonilha, Viswanathan Ramakrishnan, Steven A Kautz, Ryan J Downey, Blair H S Dellenbach, Abigail W Lauer, Caroline M Roark, Lauren E Landers, Sarah K Phillips, Amanda A Vatinno,

BACKGROUND:Peripheral sensory stimulation has been used in conjunction with upper extremity movement therapy to increase therapy-induced motor gains in patients with stroke. The limitation is that existing sensory stimulation methods typically interfere with natural hand tasks and thus are administered prior to therapy, requiring patients' time commitment. To address this ... Read more >>

Phys Ther (Physical therapy)
[2019, 99(3):319-328]

Cited: 0 times

View full text PDF listing >>



Effects of upper body strength, hand placement and foot placement on ladder fall severity.

Erika M Pliner, N J Seo, Viswanathan Ramakrishnan, Kurt E Beschorner,

BACKGROUND:A plurality of fatal falls to lower levels involve ladders. After a slip/misstep on a ladder, climbers use their upper and lower limbs to reestablish contact with the ladder. RESEARCH QUESTION:This study investigates the impact of upper body strength, hand placement and foot placement on fall severity after a ladder ... Read more >>

Gait Posture (Gait & posture)
[2019, 68:23-29]

Cited: 1 time

View full text PDF listing >>



An Analytic Approach Using Candidate Gene Selection and Logic Forest to Identify Gene by Environment Interactions (G × E) for Systemic Lupus Erythematosus in African Americans.

Bethany J Wolf, Paula S Ramos, J Madison Hyer, Viswanathan Ramakrishnan, Gary S Gilkeson, Gary Hardiman, Paul J Nietert, Diane L Kamen,

Development and progression of many human diseases, such as systemic lupus erythematosus (SLE), are hypothesized to result from interactions between genetic and environmental factors. Current approaches to identify and evaluate interactions are limited, most often focusing on main effects and two-way interactions. While higher order interactions associated with disease are ... Read more >>

Genes (Basel) (Genes)
[2018, 9(10):]

Cited: 1 time

View full text PDF listing >>



Use of imperceptible wrist vibration to modulate sensorimotor cortical activity.

Na Jin Seo, Kishor Lakshminarayanan, Abigail W Lauer, Viswanathan Ramakrishnan, Brian D Schmit, Colleen A Hanlon, Mark S George, Leonardo Bonilha, Ryan J Downey, Will DeVries, Tibor Nagy,

Peripheral sensory stimulation has been used as a method to stimulate the sensorimotor cortex, with applications in neurorehabilitation. To improve delivery modality and usability, a new stimulation method has been developed in which imperceptible random-frequency vibration is applied to the wrist concurrently during hand activity. The objective of this study ... Read more >>

Exp Brain Res (Experimental brain research)
[2019, 237(3):805-816]

Cited: 1 time

View full text PDF listing >>



Early developmental assessment with a short screening test, the STEP, predicts one-year outcomes.

Laurel Gower, Dorothea Jenkins, Jamie L Fraser, Viswanathan Ramakrishnan, Patty Coker-Bolt,

OBJECTIVE:To evaluate the Specific Test of Early Infant Motor Performance (STEP), a rapid screening test of preterm infants at risk for developmental delay. STUDY DESIGN:We prospectively studied 23 preterm infants' performance on the STEP and the Test of Infant Motor Performance (TIMP) at term and 3 months, and on the ... Read more >>

J Perinatol (Journal of perinatology : official journal of the California Perinatal Association)
[2019, 39(2):184-192]

Cited: 2 times

View full text PDF listing >>



Dissemination of novel biostatistics methods: Impact of programming code availability and other characteristics on article citations.

Amy E Wahlquist, Lutfiyya N Muhammad, Teri Lynn Herbert, Viswanathan Ramakrishnan, Paul J Nietert,

BACKGROUND:As statisticians develop new methodological approaches, there are many factors that influence whether others will utilize their work. This paper is a bibliometric study that identifies and quantifies associations between characteristics of new biostatistics methods and their citation counts. Of primary interest was the association between numbers of citations and ... Read more >>

PLoS One (PloS one)
[2018, 13(8):e0201590]

Cited: 0 times

View full text PDF listing >>



Treatment effect on ordinal functional outcome using piecewise multistate Markov model with unobservable baseline: an application to the modified Rankin scale.

Christy Cassarly, Renee' H Martin, Marc Chimowitz, Edsel A Peña, Viswanathan Ramakrishnan, Yuko Y Palesch,

In clinical trials, longitudinally assessed ordinal outcomes are commonly dichotomized and only the final measure is used for primary analysis, partly for ease of clinical interpretation. Dichotomization of the ordinal scale and failure to utilize the repeated measures can reduce statistical power. Additionally, in certain emergent settings, the same measure ... Read more >>

J Biopharm Stat (Journal of biopharmaceutical statistics)
[2019, 29(1):82-97]

Cited: 0 times

View full text PDF listing >>



An empirical approach to determine a threshold for assessing overdispersion in Poisson and negative binomial models for count data.

Elizabeth H Payne, Mulugeta Gebregziabher, James W Hardin, Viswanathan Ramakrishnan, Leonard E Egede,

Overdispersion is a problem encountered in the analysis of count data that can lead to invalid inference if unaddressed. Decision about whether data are overdispersed is often reached by checking whether the ratio of the Pearson chi-square statistic to its degrees of freedom is greater than one; however, there is ... Read more >>

Commun Stat Simul Comput (Communications in statistics: Simulation and computation)
[2018, 47(6):1722-1738]

Cited: 1 time

View full text PDF listing >>



Functional indicators of vitamin D adequacy for very low birth weight infants.

Sarah N Taylor, Amy Wahlquist, Carol L Wagner, Viswanathan Ramakrishnan, Myla Ebeling, Bruce W Hollis,

OBJECTIVE:To identify the vitamin D status to optimize calcium and bone health in preterm infants. STUDY DESIGN:Very low birth weight infants had measurement of 25-hydroxyvitamin D status and markers of calcium and bone health from birth to term age. Piecewise linear regression modeling was performed to identify a 25-hydroxyvitamin D ... Read more >>

J Perinatol (Journal of perinatology : official journal of the California Perinatal Association)
[2018, 38(5):550-556]

Cited: 0 times

View full text PDF listing >>



Peer-to-Peer Mentoring for African American Women With Lupus: A Feasibility Pilot.

Edith M Williams, J Madison Hyer, Ramakrishnan Viswanathan, Trevor D Faith, Delia Voronca, Mulugeta Gebregziabher, Jim C Oates, Leonard Egede,

OBJECTIVE:To examine the feasibility and potential benefits of peer mentoring to improve the disease self-management and quality of life of individuals with systemic lupus erythematosus (SLE). METHODS:Peer mentors were trained and paired with up to 3 mentees to receive self-management education and support by telephone over 12 weeks. This study ... Read more >>

Arthritis Care Res (Hoboken) (Arthritis care & research)
[2018, 70(6):908-917]

Cited: 8 times

View full text PDF listing >>



Restoration of Kv7 Channel-Mediated Inhibition Reduces Cued-Reinstatement of Cocaine Seeking.

Jeffrey Parrilla-Carrero, William C Buchta, Priyodarshan Goswamee, Oliver Culver, Greer McKendrick, Benjamin Harlan, Aubin Moutal, Rachel Penrod, Abigail Lauer, Viswanathan Ramakrishnan, Rajesh Khanna, Peter Kalivas, Arthur C Riegel,

Cocaine addicts display increased sensitivity to drug-associated cues, due in part to changes in the prelimbic prefrontal cortex (PL-PFC). The cellular mechanisms underlying cue-induced reinstatement of cocaine seeking remain unknown. Reinforcement learning for addictive drugs may produce persistent maladaptations in intrinsic excitability within sparse subsets of PFC pyramidal neurons. Using ... Read more >>

J. Neurosci. (The Journal of neuroscience : the official journal of the Society for Neuroscience)
[2018, 38(17):4212-4229]

Cited: 3 times

View full text PDF listing >>



Comparison of multistate Markov modeling with contemporary outcomes in a reanalysis of the NINDS tissue plasminogen activator for acute ischemic stroke treatment trial.

Christy Cassarly, Renee' H Martin, Marc Chimowitz, Edsel A Peña, Viswanathan Ramakrishnan, Yuko Y Palesch,

Historically, ordinal measures of functional outcome have been dichotomized for the primary analysis in acute stroke therapy trials. A number of alternative methods to analyze the ordinal scales have been proposed, with an emphasis on maintaining the ordinal structure as much as possible. In addition, despite the availability of longitudinal ... Read more >>

PLoS ONE (PloS one)
[2017, 12(10):e0187050]

Cited: 1 time

View full text PDF listing >>



A study of the properties of Gaussian mixture model for stable isotope standard quantification in MALDI-TOF MS.

John Christian G Spainhour, Michael G Janech, Viswanathan Ramakrishnan,

The quantification of peptides in Matrix assisted laser desorption/ionization time-of-flight mass spectrum analysis coupled with stable isotope standards has been used to quantify native peptides under many experimental conditions. This approach has difficulties quantifying samples containing peptides with ion currents in overlapping (convolved) spectra. In a previous article we proposed ... Read more >>

Commun Stat Simul Comput (Communications in statistics: Simulation and computation)
[2019, 48(6):1637-1650]

Cited: 1 time

View full text PDF listing >>



Cytokine balance and behavioral intervention; findings from the Peer Approaches to Lupus Self-Management (PALS) project.

Edith M Williams, J Madison Hyer, Ramakrishnan Viswanathan, Trevor D Faith, Leonard Egede, Jim C Oates, Gailen D Marshall,

The Peer Approaches to Lupus Self-Management program sought to address the disparate impact of systemic lupus erythematosus (SLE) on African American women through a peer mentoring intervention with aims of reducing stress, anxiety, and depression. Given the association between psychological health and immune function this study examines the relationship between ... Read more >>

Hum. Immunol. (Human immunology)
[2017, 78(9):574-581]

Cited: 3 times

View full text PDF listing >>



Advertisement

Disclaimer
0.9882 s