Author Interviews
21 Jan Fragmented Post-Surgical Care Leads To Worse Outcomes For Elderly Patients
Posted at 18:37h
in Author Interviews, Brigham & Women's - Harvard, Geriatrics, Hospital Readmissions, JAMA, Surgical Research
MedicalResearch.com Interview with:
Thomas C. Tsai, MD, MPH
Departments of Surgery and Health Policy and Management
Harvard School of Public Health, Boston, Massachusetts
Medical Research: What is the background for this study? What are the main findings?
Dr. Tsai: Emerging evidence is suggesting that fragmented care is associated with higher costs and lower quality. For elderly patients undergoing major surgical procedures, fragmentation of care in the post-discharge period may be especially problematic. We therefore hypothesized that elderly patients receiving fragmented post-discharge care would have worse outcomes. We found that among Medicare patients who are readmitted after a major surgical operation, one in four are readmitted to a different hospital than the one where the original operation was performed. Even taking distance traveled into account, we find that this type of postsurgical care fragmentation is associated with a substantially higher risk of death.
21 Jan Mental Health Services Linked To Lower Suicide Rate in Large HMO
Posted at 17:03h
in Author Interviews, Baylor College of Medicine Houston, JAMA, Mental Health Research
MedicalResearch.com Interview with:
M. Justin Coffey MD
Associate Professor
Menninger Department of Psychiatry & Behavioral Sciences
Baylor College of Medicine
MedicalResearch: What is the background for this study? What are the main findings?
Dr. Coffey: Although both the US Surgeon General and the Institute of Medicine have called on health care systems to reduce suicide, the few assessments of suicide in such systems have examined only specific patient groups and not the entire population of health plan members. Our study reports the first information on suicide for the entire membership of a large health maintenance organization (HMO). The findings provide a previously unavailable baseline data for health care systems who are engaged in important efforts to measure and prevent suicide.
We identified all suicides among the entire membership of our HMO network between 1999 and 2010, determining the date and cause of death using official state mortality records. In our sample, the annual suicide rate among all HMO members (including non-patient members) did not change over time, whereas the annual suicide rate in the general population of the state of Michigan increased significantly. Importantly, suicides actually decreased among HMO members who received specialty mental health services, whereas suicides increased among HMO members who accessed general medical services but not specialty mental health services.
21 Jan Antimicrobial Chlorhexidine Baths Did Not Reduce Hospital Infections
Posted at 16:45h
in Author Interviews, Critical Care - Intensive Care - ICUs, Hospital Acquired, Vanderbilt
MedicalResearch.com Interview with:
Michael Noto, MD, PhD
Pulmonary and Critical Care Medicine
Vanderbilt University Medical Center
Medical Research: What is the background for this study? What are the main findings?
Dr. Noto: Health care-associated infections are the most common complication for hospitalized patients and several studies have suggested that bathing critically ill patients with the antimicrobial chlorhexidine reduces health care-associated infections. In the largest study of chlorhexidine bathing to date, however, we were unable to demonstrate a reduction in infections.
21 Jan Tool Helps Chronic Kidney Disease Patients Make Dialysis Decisions
MedicalResearch.com Interview with: Suma Prakash MD, MSc, FRCPC Department of Medicine, Division of Nephrology Case Western Reserve University MetroHealth Medical Center Cleveland, Ohio Medical Research: What is the background for this study? What are the main findings? Dr. Prakash: Patients with advanced chronic kidney disease are often faced with difficult decisions of having to choose between options to replace their kidney function. Many patients may not be ready to make treatment decisions since most people don’t want to need a chronic medical treatment. The behavioural stage of change model originally used to help people with smoking cessation has been used to help patients make decisions about self-care with diabetes and undergo cancer screening. It has not been studied in patients with chronic kidney disease. As patients progress through the stages, they are more ready to make decisions. Focusing on better understanding the decision making process from patients’ perspectives allows us as medical professionals to help patients make timely decision about their options.21 Jan Bisphenol A Linked To Oxidative Stress in Pregnancy
MedicalResearch.com Interview with:
Vasantha Padmanabhan, MS, PhD
Professor, Departments of Pediatrics, Obstetrics and Gynecology, Molecular and Integrative Physiology, and Environmental Health Sciences
University of Michigan Ann Arbor, Mi 48109
Medical Research: What is the background for this study? What are the main findings?
Response: Controversy exists regarding the human health effects of bisphenol A (BPA), an endocrine-disrupting industrial chemical, present in plastic products, baby bottles, food can liners, and wide array of paper products including cash receipts. BPA has been linked to adverse metabolic effects, including obesity, diabetes and cardiac disease. This study examined if exposure to bisphenol A during pregnancy, at levels humans are exposed to, induces oxidative stress, a major contributor to the development of insulin resistance, type 2 diabetes, metabolic syndrome, and cardiovascular disease. Findings from this multi species study show an association between higher maternal- and cord-blood BPA levels and 3-nitrotyrosine Y (NY), a marker of oxidative stress, in 24 pregnant women. Similar effect on oxidative stress was also found when human-comparable BPA doses were given to pregnant sheep and rats. Similarity of findings between BPA exposure and oxidative stress in the human association study and animals testing study raises concern about potential risk of BPA later in life.
21 Jan Working In Pairs Improved Medical Students’ Diagnostic Accuracy
MedicalResearch.com Interview with:
Dr. Juliane Kämmer Postdoctoral Researcher
on behalf of the authors
Max Planck Institute for Human Development
Center for Adaptive Rationality Berlin Germany
Medical Research: What is the background for this study? What are the main findings?
Dr. Kämmer: Diagnostic errors contribute substantially to preventable medical error. Of the multiple reasons for diagnostic error (such as technical failures or poorly cooperating patients), cognitive error is among the most frequent. Although a vast amount of literature explores ways to reduce cognitive errors, for example, during data synthesis, the collaborative character of clinical decision making has been largely neglected so far. Thus, the aim of our study was to investigate the effect of working in teams as opposed to working alone on diagnostic accuracy and the diagnostic decision process as such (including the time to diagnosis, number of ordered diagnostic tests and calibration of diagnostic confidence to diagnostic accuracy).
In our study, we asked senior medical students to imagine being at the emergency ward and having to diagnose six simulated patients with respiratory distress on a computer – either working individually or in pairs. We indeed found that working in pairs reduced diagnostic error without requiring more diagnostic data gathering. Interestingly, neither differences in knowledge nor in amount and relevance of acquired diagnostic information could explain the superior accuracy of the pairs; neither did the statistically increased likelihood of containing a knowledgeable member. We thus have shown that – similar to other studies outside medicine – collaboration may help correct errors, fill knowledge gaps and counteract reasoning flaws – and thus save lives. Moreover, we found that reflecting on their personal confidence may point members of teams towards an increased probability of a diagnostic error.
21 Jan Link Between Stress and Fertility Examined
MedicalResearch.com Interview with: Anna Geraghty Department of Integrative Biology University of California, Berkeley, Berkeley, Medical Research: What is the background for this study? What are the main findings? Response: RFRP3 in mammals has been well characterized as a negative regulator of the hormonal reproductive axis. It shuts down release of gonadotropins necessary for successful reproduction, similar to how stress inhibits reproduction. Our lab has previously shown that stress can directly regulate RFRP3 levels in males-both acute and chronic stress lead to an upregulation of RFRP3 levels in the male rat. As a followup to that study, we were interested in looking at whether this response was similar in females, and how that may affect long term fertility. We found that chronic (18 days) of stress led to an increase in RFRP3 levels all all stages of the estrous cycle. This increase was also sustained for at least 4 days, or one whole estrous cycle, after the stress ended- the equivalent to a month menstrual cycle in humans. In rats that were stressed and then allowed to recover for 4 days, animals that were stressed were significantly less successful at reproducing- 76% success rate in controls compared to 21% in the stressed animals. This was a result of a combination of deficits in the mating process- less stressed animals successfully copulated, those that did successfully mate had fewer pregnancies, and gave birth to smaller litters. However, utilizing an inducible virus to knockdown RFRP levels in the hypothalamus specifically during the stress period prevented all of these problems- stressed animals without stress-induced RFRP3 increases looked indistinguishable to controls.21 Jan Study Examines Chronic Inflammation of Traumatic Brain Injury
MedicalResearch.com Interview with:
Alan I Faden, M.D.
David S. Brown Professor in Trauma
Professor, Departments of Anesthesiology, Anatomy & Neurobiology, Neurosurgery, and Neurology
Director, Center for Shock, Trauma & Anesthesiology Research (STAR) University of Maryland School of Medicine
Medical Research: What is the background for this study? What are the main findings?
Dr. Faden: Accumulating clinical and pre-clinical research data indicate that traumatic brain injury (TBI) can lead to chronic progressive neurodegeneration. In this regard, most attention has focused on the connections between TBI and with Alzheimer disease (AD) or Chronic Traumatic Encephalopathy (CTE). However, recent epidemiological studies raise questions about the association between TBI and AD, and CTE is likely a less common end-stage result resulting from complex pathobiological changes. In contrast, both older and newer studies underscore that traumatic brain injury can cause chronic neuroinflammation that leads to chronic neurodegeneration. In contrast to AD and CTE, the latter condition appears to be potentially treatable, even long after injury. Our paper critically assesses the mechanisms and treatment of chronic post traumatic neurodegeneration.
21 Jan Isolated Systolic Hypertension Declines in Prevalence
MedicalResearch.com Interview with: Xuefeng (Chris) Liu, PhD Associate Professor, School of Nursing Ann Arbor, MI 48109 MedicalResearch: What is the background for this study? What are the main findings? Dr. Liu: Isolated systolic hypertension (ISH), defined as a systolic blood pressure (SBP) of ≥ 140 mm Hg and a diastolic blood pressure (DBP) of < 90 mm Hg, is an important hypertension subtype. Isolated systolic hypertension is often characterized as a phenomenon of aging and becomes the major form of hypertension for people aged 50 or more. Elevated SBP has been thought to be more important than elevated DBP as a risk factor for adverse cardiovascular and renal outcomes. When combined with other risk factors such as poor diet and lack of exercise, untreated Isolated systolic hypertension can lead to serious health problems (e.g. stroke, heart disease, and chronic kidney disease). The existing studies of pattern changes in rates of Isolated systolic hypertension in the US adult population focus on uncontrolled hypertension subtypes among individuals with uncontrolled blood pressure, and the prevalence and changes of untreated ISH in the general population was not the main focus. In addition, the studies were based on the data collected two decades ago. More recent prevalence estimates and long-term changes of ISH among US untreated adults are needed to fill the gap in the hypertension literature. In our study, we used data from the National Health and Nutrition Examination Survey 1999-2010, conducted by CDC National Center for Health Statistics. We found that the prevalence of untreated ISH significantly decreased from 1999-2004 to 2005-2010. Old persons, females, and non-Hispanic blacks had higher prevalence of untreated Isolated systolic hypertension. Compared with 1999-2004, the prevalence of untreated Isolated systolic hypertension in 2005-2010 declined among older and female individuals. Further stratification analyses showed that treated ISH improved over time for older non-Hispanic whites and blacks, non-Hispanic white females, older individuals with a college education or above and females with a high school education or below.20 Jan Could H pylori Be Protective Against Multiple Sclerosis?
MedicalResearch.com Interview with:
Allan G Kermode MBBS MD FRACP FRCP
Clinical Professor of Neuroimmunology, Murdoch University
Clinical Professor of Neurology, University of Western Australia
Head, Department of Neurology and Clinical Neurophysiology SCGH
Centre for Neuromuscular and Neurological Disorders
Australian Neuromuscular Research Institute Sir Charles Gairdner Hospital Perth WA Australia Institute of Immunology and Infectious Diseases
Murdoch University, Western Australia
MedicalResearch: You found that H. pylori sero-positivity was significantly lower in female patients with MS than in female healthy controls, but you didn’t find such a trend in men with Multiple Sclerosis… Briefly, what might explain this association between H. pylori and Multiple Sclerosis in women? (i.e the hygiene hypothesis I suppose?).
Prof. Kemode: There are a number of possible explanations, but we believe that the most likely is that helicobacter colonisation is a surrogate marker for the baseline levels of exposure to environmental pathogens and organisms during childhood. We have argued this point of view in our manuscript. It should be emphasised that perhaps not all exposure to infectious agents need necessarily be pathogenic, and the concept of the protobiome is an important one. Every healthy (and unhealthy) individual is host to very many organisms, with the gut having the widest diversity. Other explanations for the association might include that there is some specific antigenic interaction occurring promoting specific immune tolerance to CNS antigens, but I believe that this conclusion would be drawing a very long bow with our current stage of knowledge regarding Multiple Sclerosis.
MedicalResearch: Why does this relationship exist in women but not in men? (presumably, they are exposed to the same sanitation, hygiene etc.)
Prof. Kemode: This is arguably one of the most fascinating observations of our study. Historically the sex ratio in Multiple Sclerosis was equal, yet in the last 100 years the prevalence of Multiple Sclerosis has increased markedly and the majority of this increase has occurred in women such that in Australia the sex ratio F:M approximates 3:1. The fact that over the same period prevalence of helicobacter in Western countries has declined markedly is a tantalising observation. At this stage scientific knowledge has not explained the changing sex ratios in Multiple Sclerosis nor can we yet explain the strong helicobacter association in females but not males in our study, but our study provides useful navigation to direct further research.
20 Jan Intracytoplasmic Sperm Injection Does Not Improve Reproductive Outcomes
MedicalResearch.com Interview with:
Sheree L. Boulet, DrPH, MPH
Division of Reproductive Health
Centers for Disease Control and Prevention, Atlanta, Georgia
Medical Research: What is the background for this study? What are the main findings?
Dr. Boulet: Intracytoplasmic Sperm Injection is generally considered a safe and effective treatment for male factor infertility; however, some studies have shown that ICSI is increasingly used in patients without male factor infertility without clear evidence of a benefit over conventional in vitro fertilization (IVF). In addition to increasing the cost of an IVF cycle, use of Intracytoplasmic Sperm Injection has been found to increase the risk for adverse infant outcomes such as birth defects, chromosomal abnormalities and autism. Using data from CDC’s National Assisted Reproductive Technology Surveillance System, we found that use of ICSI increased by fourfold from 1996 through 2012 (from 15.4% to 66.9%). Furthermore, we found that use of Intracytoplasmic Sperm Injection did not improve reproductive outcomes such as rates of pregnancy, miscarriage and live birth, when compared with conventional IVF, regardless of whether male factor infertility was present.
20 Jan Preventive Antibiotics Did Not Improve Stroke Outcomes But Reduced Infections
MedicalResearch.com Interview with: Prof. dr. Diederik van de Beek Department of Neurology, Academic Medical Center, University of Amsterdam The Netherlands MedicalResearch.com: What is the background for this study? What are the main findings? Dr. van de Beek: In adults with acute stroke, infections occur commonly and are associated with an unfavourable functional outcome. In the Preventive Antibiotics in Stroke Study (PASS) we aimed to establish whether or not preventive antimicrobial therapy with a third-generation cephalosporin, ceftriaxone, improves functional outcome in patients with acute stroke. PASS is an investigator-initiated, randomised, open-label, masked-endpoint trial that was undertaken between 2010 and 2014 in 30 Dutch centres and enrolled 2550 patients with ischaemic or haemorrhagic stroke. Randomly assigned in a 1:1 ratio to either preventive antibiotic therapy or a control group, all patients received standard stroke unit care. Starting within 24 h after stroke onset, patients in the preventive antibiotic group were given additional treatment with ceftriaxone administered intravenously at a dose of 2 g every 24 h for 4 days. The main findings were that preventive ceftriaxone did not improve 3-month functional outcome on the modified Rankin Scale (adjusted common odds ratio 0·95 [95% CI 0·82–1·09]); however, clinically diagnosed post-stroke infections were significantly reduced (adjusted odds ratio 0·55 [0·44–0·70]). Preventive antibiotic therapy with ceftriaxone is a safe treatment.20 Jan Aggressive Behaviors in Preschool Children Linked To Later Conduct Disorders
MedicalResearch.com Interview with:
Ji Su Hong, MD
Department of Psychiatry
Washington University School of Medicine St. Louis, MO
Medical Research: What is the background for this study? What are the main findings?
Dr. Ji Su Hong: The estimated prevalence of preschool conduct disorder is 3.9%-6.6%. Approximately 1 out of 20 preschoolers has conduct disorder. Disruptive behaviors are common in the preschool period of development. However, to date we have not had scientific data to help guide clinicians to distinguish between normal disruptive behaviors in preschoolers and behaviors that are markers of later Conduct disorder at school age.
There were common misbehaviors which were found in preschoolers with mental health problems as well as healthy preschoolers. Those were losing temper, low intensity destruction of property and deceitfulness/stealing.
Preschoolers who exhibited high-intensity defiant behavior, aggression toward people or animals, high-intensity destruction of property, peer problems and deceitfulness, including stealing, were more likely to have preschool conduct disorder and they were more likely to be diagnosed with a conduct disorder at school-age.
20 Jan Study Finds No Increased Heart Attack Risk in HIV Patients
MedicalResearch.com Interview with: Dr. Daniel Klein, MD Kaiser Permanente Northern California San Leandro Medical Center San Leandro, CA Medical Research: What is the background for this study? Dr. Klein: The prognosis for individuals living with HIV infection has dramatically improved with the availability of potent, well-tolerated and convenient antiretroviral therapies. HIV infection can now be...
20 Jan Key Clock Genes Linked To Alcohol Use and Abuse
MedicalResearch.com Interview with:
Timo Partonen MD, Research Professor
National Institute for Health and Welfare
Helsinki, Finland
Medical Research: What is the background for this study? What are the main findings?
Response: Alcohol-use disorders are often comorbid conditions with mood and anxiety disorders. Clinical studies have demonstrated that there are abnormalities in circadian rhythms and intrinsic clocks in patients with alcohol-use disorders. Circadian clock gene variants are therefore a fruitful target of interest.
The main findings are that variants of key clock genes, namely those of ARNTL, ARNTL2, PER1 and PER2, have association with alcohol consumption, with alcohol abuse, or with alcohol dependence. It is of interest that variants of a fifth clock gene of key importance, that is those of CLOCK, are associated with alcohol-use disorders only if comorbid with depressive disorders.
20 Jan High-Intensity Statin Therapy Underutilized After Heart Attack
MedicalResearch.com Interview with:
Dr. Robert S. Rosenson, MD
Professor, Cardiology
Icahn School of Medicine at Mount Sinai
Cardiovascular Institute
New York, New York 10029
Medical Research: What is the background for this study? What are the main findings?
Dr. Rosenson: High intensity statin therapy is evidence-based and guideline directed for patients with acute coronary syndromes. In a 5 percent random sample of Medicare patients, we investigated the utilization of high vs low-moderate dosage statin in older adjusts who were admitted with an acute myocardial infarction of severe myocardial ischemia requiring hospitalization for a revascularization procedure (PCI or CABG).
We report that only 27 percent of hospitalized patients received high-intensity statin therapy based on their first outpatient fill for a statin medication. The most important determinant for the utilization of statin therapy is the dosage of the statin previously prescribed as an outpatient. When patients were started on a high-intensity statin, the continued use diminished in the ensuing year
20 Jan Sitting Time Linked To Increased Heart Disease and Cancer Mortality
Posted at 00:06h
in Annals Internal Medicine, Author Interviews, Exercise - Fitness, Lifestyle & Health
MedicalResearch.com Interview with:
David Alter, MD, PhD FRCPC Senior Scientist
Toronto Rehabilitation Institute-University Health Network and Institute for Clinical Evaluative Sciences
Research Director, Cardiac Rehabilitation and Secondary Prevention Program Toronto Rehabilitation Institute
Medical Research: What is the background for this study? What are the main findings?
Dr. Alter: We knew going into the study that exercise was an important lifestyle factor that improved health. We also knew from studies that sedentary time was associated with deleterious health-effects. What we didn’t know was whether the health-outcome effects of sedentary time and exercise were really one and the same (i.e., albeit opposite ends of the same spectrum) or alternatively, whether the health effects of each were independent of one another. We explored over 9000 published studies to quantify the health-outcome effects associated with sedentary behaviour and extracted only those which took into account both sedentary time and exercise. We found a consistent association between sedentary time and a host of health outcomes independent of exercise. Specifically, after controlling for an individual’s exercising behaviour, sitting-time was associated with a 15-20% higher risk of death, heart-disease, death from heart disease, cancer-incidence, and death from cancer. Sitting time was also independently associated with a marked (i.e., 90% increase) in the risk for diabetes after controlling for exercise. In short, sedentary times and exercise are each independently associated with health outcomes. We hypothesize that the two may have different mechanism, and may require different therapeutic strategies. But, the health-outcome implications of both are each important in their own right.
19 Jan VA Study Examines Variability of Costs and Mortality of Stent Surgery
MedicalResearch.com Interview with:
Dr. P. Michael Ho, MD PhD
Denver Veteran Affairs Medical Center,
University of Colorado, Denver, Section of Cardiology
Denver, Colorado 80220.
Medical Research: What is the background for this study? What are the main findings?
Dr. Ho: There is increasing interest in measuring health care value, particularly as the healthcare system moves towards accountable care. Value in health care focuses on measuring outcomes achieved relative to costs for a cycle of care. Attaining high value care - good clinical outcomes at low costs - is of interest to patients, providers, health systems, and payers. To date, value assessments have not been operationalized and applied to specific patient populations. We focused on percutaneous coronary intervention (PCI) because it is an important aspect of care for patients with ischemic heart disease, is commonly performed and is a costly procedure. In this study, we evaluated 1-year risk-adjusted mortality and 1-year risk-standardized costs of care for all patients who underwent PCI in the VA healthcare system from 2008 to 2010.
We found that median one-year unadjusted hospital mortality rate was 6.13% (interquartile range 4.51% to 7.34% across hospitals). Four hospitals were significantly above the one-year risk standardized median mortality rate, with median mortality ratios ranging from 1.23 to 1.28; no hospitals were significantly below median mortality. Median 1-year total unadjusted hospital costs were $46,302 (IQR of $37,291 to $57,886) per patient. There were 16 hospitals above and 19 hospitals below the risk standardized average cost, with risk standardized ratios ranging from 0.45 to 2.09 reflecting much larger magnitude of variability in costs compared to mortality. These findings suggest that there are opportunities to improve PCI healthcare by reducing costs without compromising outcomes. This approach of evaluating outcomes and costs together may be a model for other health systems and accountable care organizations interested in operationalizing value measurement.
19 Jan Is Strict Salt Limit Necessary For Older Adults?
MedicalResearch.com Interview with:
Andreas Kalogeropoulos, MD MPH PhD
Assistant Professor of Medicine (Cardiology)
Emory University School of Medicine Emory Clinical Cardiovascular Research Institute
Atlanta GA 30322
Medical Research: What is the background for this study? What are the main findings?
Dr. Kalogeropoulos: There is ongoing debate on how low should we go when it comes to dietary sodium (salt) restriction recommendations. In this study, we examined the association between self-reported dietary sodium intake and 10-year risk for death, cardiovascular disease, and heart failure in approximately 2,600 adults 71-80 years old. The subjects (women: 51.2%; white: 61.7%; black: 38.3%) were participants of the community-based Health, Aging, and Body Composition Study, which is sponsored by NIH and focuses on aging processes, i.e. was not specifically designed to address the issue of dietary salt intake. Also, it is important to note that salt intake was self-reported (not objectively measured) using a food frequency questionnaire, which underestimates salt intake. Keeping these limitations in mind, we did not observe a significant association between self-reported sodium intake and 10-year mortality, cardiovascular disease, and heart failure. Ten-year mortality was lower in the group reporting 1500–2300 mg daily sodium intake (30.7%) compared to those reporting daily intake less than 1500 mg (33.8%) or over 2300 mg (35.2%); however, this difference was not statistically significant. The 10-year event rates for cardiovascular disease (28.5%, 28.2%, and 29.7%) and heart failure (15.7%, 14.3%, and 15.5%) were also comparable across the <1500-mg, 1500-2300-mg, and >2300-mg dietary sodium intake groups.
19 Jan Hardening of Aorta Linked To Poor Cognitive Performance
MedicalResearch.com Interview with:
Jose Gutierrez MD, MPH
Assistant Professor of Neurology
Division of Stroke and Cerebrovascular Disease
Columbia University Medical Center NY, NY
Medical Research: What is the background for this study? What are the main findings?
Dr. Gutierrez: There is growing interest in the effects of vascular health in cognition. The prevailing thought is that vascular disease leads to worse cognition due to direct structural damage of the brain, as in the case of brain infarcts, microhemorrhages or white matter hyperintensities, which are themselves associated with traditional cardiovascular risk factors such as hypertension, diabetes, smoking etc. Arterial stiffness, particularly of the aorta, has gained interest among researchers as predictors of vascular disease and worse cognition, but it is not clear whether arterial stiffness in the absence of traditional definition of vascular disease may be associated with worse cognition.
We investigated in a representative sample of the US among adults 60 years or older who underwent cognitive testing with the Digit Symbol Subtraction test and who also had other measures of vascular disease, including blood workup, blood pressure measurement and Pulse pressure. We hypothesized that indirect measures of arterial stiffness such as ABI > 1.3 or pulse pressure would be associated with worse cognition, even among those without any clinical vascular disease or traditional vascular risk factors. We Included 2573 US adults in the sample, segregated those with any self-reported vascular disease or vascular risk factors and we found that among those without vascular disease or risk factors, an ABI > 1.3 and increased intra-visit blood pressure variability were predictors of worse cognitive performance compared with those without these indicators. Among participants with both indirect markers of arterial stiffness, their cognitive performance was worse that having only one of them suggesting additive effects of these two variables.
19 Jan Buddy System May You Swap Bad Habits For Good Ones
MedicalResearch.com Interview with:
Jane Wardle
University College London
Medical Research: What is the background for this study? What are the main findings?
Dr. Wardle: Previous studies have shown that couples tend to have similar health behaviours to one another, but no studies had compared having a partner who takes up a healthy behaviour (e.g. quits smoking) with having one whose behaviour is consistently healthy (e.g. never smoked). Nor have there been other studies in the older age group – our participants were over 60 on average. We used data from 3722 couples participating in the English Longitudinal Study of Ageing (ELSA) to explore this issue for three behaviours: smoking, physical activity, and weight loss. For each behaviour, we found that when one partner changed their behaviour, the other partner was more likely to make a positive change, and the effect was stronger than having a partner whose behaviour was consistently healthy (i.e. never smoked/always exercised).
19 Jan Healthy Diet Lowers Diabetes Risk in All Ethnic Groups
Posted at 21:20h
in Author Interviews, Brigham & Women's - Harvard, Diabetes, Diabetes Care, Nutrition
MedicalResearch.com Interview with:
Jinnie J. Rhee MSc, ScD
Department of Medicine, Stanford University School of Medicine Palo Alto, CA
Medical Research: What is the background for this study? What are the main findings?
Response: The goal of this study was to see if the dietary determinants of type 2 diabetes observed in predominantly white populations were similar to those in other racial and ethnic groups. We created a dietary diabetes risk reduction score using eight different dietary factors found to be associated with risk of type 2 diabetes, where a higher score indicates a healthier overall diet (A higher score included low intakes trans fat, sugar-sweetened beverages, and red and processed meats; lower glycemic index; and higher intakes of cereal fiber, nuts, and coffee; and higher polyunsaturated to saturated fat ratio). We found a protective association of similar magnitude between a healthy overall diet and type 2 diabetes risk in all racial and ethnic groups. However, in terms of the actual number of preventable cases, a healthier diet conferred even greater benefit for minority women because they were initially at higher risk than white women.
This study is significant because diabetes is a rapidly growing epidemic in most parts of the world, but most previous studies of diet and diabetes have been conducted in populations of European origin. This analysis was very powerful because it combined two large populations with a total of 156,030 women who were followed for up to 28 years with many repeated assessments of diet. This allowed us to conduct detailed analyses within specific racial and ethnic groups.
19 Jan Breast Cancer Patients May Benefit From Detailed Nutrition Monitoring
MedicalResearch.com Interview with:
Cecilia Cesa Schiavon
Department of Nutrition, Federal University of Santa Catarina
Florianópolis, Santa Catarina, Brazil
Medical Research: What is the background for this study? What are the main findings?
Response: The study was based on a nutritional intervention for patients undergoing treatment for breast cancer. The intervention took place right after the surgical procedure and lasted about a year, until the end of chemotherapy. The patients were submitted to a special methodology of intervention, aimed at increasing fruit and vegetable intake and reducing red and processed meat, following the World Cancer Research Fund and the American Institute for Cancer Research in the document entitled Food, Nutrition, Physical Activity and the prevention of Cancer: A Global Perspective”.
The main findings show that women undergoing breast cancer treatment may benefit from immediate, individualized, and detailed nutrition monitoring through appropriate nutrition education.
19 Jan New Cancer Fighting Strategy Attacks Telomere Pathway In Difficult Tumors
MedicalResearch.com Interview with:
Lee Zou, Ph.D.
Professor of Pathology, Harvard Medical School
The Jim & Ann Orr MGH Research Scholar
Associate Scientific Director, MGH Cancer Center
Medical Research: What is the background for this study? What are the main findings?
Dr. Lee Zou: Cancer cells must rely on telomerase or the alternative lengthening of telomere (ALT) pathway to maintain telomeres and bypass replicative senescence. The ALT pathway is active in about 10-15% of human cancers, and it is particularly prevalent in specific cancer types, such as osteosarcoma, glioblastoma, and neuroendocrine pancreatic tumors. ALT is a recombination-mediated process. Whether the reliance of cancer cells on alternative lengthening of telomere can be exploited therapeutically was not known.
In our study, we discovered that the ATR kinase is a key regulator of alternative lengthening of telomere. We found that ATR inhibitors disrupt ALT effectively. Furthermore, we found that ATR inhibitors selectively kill ALT-positive cancer cells in a panel of caner cell lines. These findings have suggested the first rational therapeutic strategy for the treatment of ALT-positive cancer.
19 Jan New Drug For Hyperkalemia Selectively Traps Potassium
MedicalResearch.com Interview with: David K. Packham, M.B., B.S., M.D Royal Melbourne Hospital Melbourne Renal Research Group VIC 3073, Australia, Medical Research: What is the background for this study? What are the main findings? Dr. Packham: ZS-9 represents a new mechanism of action for addressing hyperkalemia. Unlike traditional nonspecific organic polymer cationexchangers, ZS-9 is a non-absorbed, inorganic crystalline potassium-selective cation exchanger that traps excess potassium in the gastrointestinal tract. It has been evaluated in three prospective, randomized, double-blind, placebo-controlled studies with over 1100 patients to date, representing the largest ever clinical development program for hyperkalemia. ZS-003 was the first of two pivotal Phase 3 studies that evaluated the safety and efficacy of ZS-9 in patients with hyperkalemia. In ZS-003, treatment of patients with an oral suspension of ZS-9 (2.5, 5, or 10 grams, three times a day) resulted in statistically significant and clinically meaningful reductions in serum potassium, compared with placebo, during the “acute phase” (first 48 hours), with 99 percent of patients achieving normal potassium levels with the highest 10 gram dose. During the next 12 days of the trial (the “maintenance phase”), ZS-9 (5 or 10 grams) given once daily could maintain the corrected potassium levels achieved during the acute phase. In contrast, patients who were randomized back to placebo after achieving normal potassium reverted back to hyperkalemia. The tolerability profile has been favorable, with adverse event rates from ZS-9 similar to that of placebo.19 Jan Periodontitis Linked To Larger Myocardial Infarct Size
MedicalResearch.com Interview with:
Dr. Francisco Mesa
Department of Periodontics,
School of Dentistry, University of Granada, Spain
Medical Research: What is the background for this study? What are the main findings?
Dr. Mesa: The size of an acute myocardial infarct (AMI) is one of the determinants of its severity, i.e., the degree of myocardial necrosis. This necrosis is indicated by peak troponin I levels in the blood. Among the acute myocardial infarct patients in our study, mediated regression analysis demonstrated that troponin I levels were higher, i.e., the infarct size was larger, in those with chronic periodontitis.
18 Jan Mortality Risks High In Elderly Patients After Carotid Artery Stenting
MedicalResearch.com Interview with:
Soko Setoguchi, MD DrPH
Assistant Professor of Medicine
Harvard Medical School and Harvard School of Public Health
Director of Safety and Outcome Research in Cardiology
Associate Physician in the Division of Pharmacoepidemiology and Pharmacoeconomics Brigham and Women’s Hospital
Medical Research: What is the background for this study? What are the main findings?
Dr. Setoguchi: Medicare made a decision to cover Carotid Artery Stenting (CAS) in 2005 after publication of SAPPHIRE, which demonstrated the efficacy of Carotid Artery Stenting (CAS) vs Carotid endarterectomy (CEA) in high risk patients for CEA. Despite the data showing increased carotid artery stenting dissemination following the 2005 National Coverage Determination, peri-procedural and long-term outcomes have not been described among Medicare beneficiaries, who are quite different from trial patients, older and with more comorbidities in general population.
Understanding the outcomes in these population is particularly important in the light of more recent study, the Carotid Revascularization Endarterectomy versus Stenting Trial (CREST), which established CAS as a safe and efficacious alternative to CEA among non-high-surgical risk patients that also expanded the clinical indication of carotid artery stenting.
Another motivation to study ‘real world outcomes in the general population is expected differences in the proficiency of physicians peforming stenting in trial setting vs. real world practice setting. SAPPHIRE and CREST physicians were enrolled only after having demonstrated CAS proficiency with low complication rates whereas hands-on experience and patient outcomes among real-world physicians and hospitals is likely to be more diverse.
We found that unadjusted mortality risks over study period of 5 years with a mean of 2 years of follow-up in our population was 32%. Much higher mortality risks observed among certain subgroups with older age, symptomatic patients and non-elective hospitalizations.
18 Jan Expedited Partner Therapy May Decrease Population Levels of Gonorrhea and Chlamydia
MedicalResearch.com Interview with: Matthew Golden MD, MPH Director, PHSKC HIV/STD Program Professor of Medicine, University of Washington Harborview Medical Center Medical Research: What is the background for this study? What are the main findings? Dr. Golden: Gonorrhea and chlamydial infection are the most common reportable infections in the United States and, in women, are associated with pelvic inflammatory disease, ectopic pregnancy, infertility and chronic pelvic pain. One way to decrease the number of cases of gonorrhea and chlamydia is to increase our success in treating the sex partners of persons diagnosed with these infections. Expedited partner therapy (EPT) - treating partners without requiring them to first undergo a medical evaluation - is one way to increase partner treatment. This usually involves giving people medication to give to their partners. Prior randomized trials have found that EPT decreases patients' risk of becoming reinfected. We conducted a community-level randomized trial to evaluate whether making free Expedited partner therapy available to medical providers would increase the use of Expedited Partner Therapy and decrease gonorrhea and chlamydial infections at the population level. We found that a public health program that made Expedited partner therapy widely available could dramatically increase medical providers use of EPT. Although our final result was not statistically significant, our findings suggest that the program likely decreased both gonorrhea and chlamydial infection by about 10% at the population-level.18 Jan Eczema and Atopic Dermatitis Linked To Increased Cardiovascular Risk
MedicalResearch.com Interview with:
Dr. Jonathan L. Silverberg MD PhD MPH
Assistant Professor in Dermatology, Medical Social Sciences and Preventive Medicine
Northwestern University, Chicago, Illinois
Medical Research: What is the background for this study? What are the main findings?
Dr. Silverberg: There is a growing body of literature supporting an association between psoriasis and increased cardiovascular risk. We hypothesized that these associations are not specific to psoriasis. Rather, they likely occur in other chronic inflammatory skin disorders, namely eczema. We studied two large-scale US population-based studies and found that adults with eczema were more likely to smoke cigarettes, drink alcohol and were less physically active. In turn, they also have higher rates of obesity, high blood pressure, prediabetes and type 2 diabetes and high cholesterol. Of note, eczema was associated with these disorders even after controlling for smoking, alcohol consumption and physical activity. This suggests that chronic inflammation and/or other factors related to eczema may also drive increased cardiovascular risk.