First published on ScienceDaily.com
In a medical records analysis of information gathered on more than 6,000 people, Johns Hopkins Medicine researchers conclude that simply asking older adult patients about their weight history at ages 20 and 40 could provide real value to clinicians in their efforts to predict patients’ future risk of heart failure, heart attacks or strokes.
In a report published Nov. 14 in the Journal of the American Heart Association, the investigators say the younger-weight question is potentially a cost-efficient, high-value “ask” likely to help physicians decide how to advise and treat their older patients, particularly now that many people change primary care physicians throughout their lives, and lifelong health records may not transfer. Asking this simple question about prior lifetime weights provided prognostic information about a person’s heart failure risk that was incremental to their measured weights at older ages and other measured traditional heart disease risk factors.
“We’ve known that the longer a person is obese, the more it becomes problematic by increasing their heart failure risk,” says Erin Michos, M.D., M.H.S., associate professor of medicine at the Johns Hopkins University School of Medicine. “That is why measuring a person’s weight at older ages may not tell the whole story about their risk. There’s now more evidence that newly obese people are in overall less danger. Our findings emphasize the importance of lifelong maintenance of a healthy weight, as greater cumulative weight from young adulthood is more risky to heart health.”
“We already routinely measure weights during a patient’s clinic visit to make health recommendations, but we think adding this low-tech question about their prior weight histories can further help direct clinical care,” she adds. “While we acknowledge that self-reported weight history is imperfect, at the very least, asking the question sparks patient reflection and self-motivation to get back to healthier weights from their younger ages.”
Heart attacks, strokes and other cardiovascular diseases remain the No. 1 killers of Americans. Heart failure, also known as congestive heart failure, is a condition marked by a gradual weakening and stiffening of the heart muscle, diminishing its ability to pump blood. Physicians routinely attempt to assess risks for heart disease and heart failure as patients age with measures of blood pressure, cholesterol, exercise levels, family history, diet and weight, Michos noted. Although a single weight measurement in an older adult is helpful, she says, weight history is even more informative, and the new study was in part designed to identify a practical way of getting it that would be considered informative enough to add to clinical care.
For the study, the researchers used data already gathered on 6,437 participants in the Multi-Ethnic Study of Atherosclerosis (MESA) recruited between 2000 and 2002 who were age 45 to 84 at time of enrollment into the study. Participants were followed an average of 13 years, and lived in six U.S. communities: Baltimore, Maryland; Chicago, Illinois; Forsyth County, North Carolina; New York City, New York; Los Angeles County, California; and St. Paul, Minnesota. On average, they were 62 years old at the study’s start. Almost 53 percent of the participants were women. About 39 percent of participants were white, more than 26 percent were African-American, 22 percent were Hispanic and a little more than 12 percent were Chinese-American.
Each participant filled out a survey that reported their weight history at age 20 and 40. Their weights were further tracked during the study period using measurements from a standardized scale over five different in-person visits. All weights were converted to body mass indexes (BMI) by dividing the weight by the square of height. A BMI less than 25 kilograms per meter squared was considered normal, while a BMI between 25 and 30 was considered overweight, and 30 and above was considered obese.
By the end of all participants’ last visit, 290 people had experienced heart failure, and 828 experienced cardiovascular disease events such as heart attacks, stroke and or death as determined by participant and family interviews and patient medical records.
As expected, Michos says, the standard measured weights taken at clinic visits during the 13-year study period were associated with later heart failure risk, with a 34 percent increased likelihood of heart failure for every 5 kilograms per meters squared increase in BMI, after accounting for other established heart disease risk factors such as age, smoking, physical activity, blood pressure and diabetes. But then her team found that even after taking into account these current measured weights at older ages, that having a self-reported history of obesity at age 20 (144 participants) was associated with a more than threefold risk of heart failure, and having a history of being obese at age 40 (716 participants) doubled the risk compared with people who had a BMI in the normal range at those ages.
“Our study confirms that maintaining a normal weight over the lifespan is the most ideal, and that when and for how long a person becomes obese are highly informative in assessing heart disease risk in older adults,” says Michos.
Michos cautioned that the new study was designed to look at associations between self-reported lifetime weights and heart disease risk over time, and not determine cause and effect or attempt to determine the accuracy of patients’ recall of their weight at young ages. Patient self-reporting can result in bias or imperfect memory, but the researchers believe most older adults have reasonably accurate recall of their younger adult weight. Their study findings suggest that even with these known limitations of weight recall, that simply asking about weight history was helpful in risk assessment. Right now, clinicians just don’t routinely ask about a person’s weights at key life points such as young- and mid-adulthood, Michos says, but it is so easy to do.
Michos says that we need to investigate how we can incorporate this ask (about lifetime weight recall) into electronic health records and into clinical practice.
About 1 in 3 deaths in the U.S. are due to heart disease, according to the American Heart Association. About 92 million American adults are living with some form of cardiovascular disease. About 5.7 million people in the U.S. live with heart failure, and more than half a million are diagnosed each year. More than half of people with heart failure will die within five years of diagnosis, according to the Centers for Disease Control and Prevention.
Johns Hopkins Medicine. “Your weight history may predict your heart failure risk: Low-tech reporting on earlier weights may guide clinical care.” ScienceDaily. ScienceDaily, 12 December 2018. <www.sciencedaily.com/releases/2018/12/181212093327.htm>.
Another exciting issue of European Neurological Review is now released, highlighting new advances in the field of Neurology, as well as featuring SAFE’s information about the Stroke Action Plan for Europe.
We find one of the case reports from this issue particularly interesting, covering a rare syndrome that can occur in persons with an ischaemic stroke.
Charles Bonnet syndrome (CBS) is characterised by the presence of visual hallucinations (VH) and visual sensory deprivation in individuals with preserved cognitive status and without a history of psychiatric illness. CBS is a rare, underdiagnosed and under-recognised syndrome, which was first described in 1769 by Charles Bonnet, who observed this phenomenon in his grandfather.
The prevalence of CBS is not consistent between authors. Some studies have stated that 0.47% of the general population suffer from CBS – this number can increase to around 15–30% when referring to patients with visual impairment. The disparity in CBS prevalence can be explained by the absence of clear diagnostic criteria, the necessity of different specialties to recognise or exclude other disorders and the incapability of patients to express the symptoms.2,3 CBS usually occurs in elderly people with compromised visual function and can be a rare manifestation of an injured visual pathway. Secondary lesions to multiple sclerosis, ischaemic stroke, temporal arteritis and meningiomas can explain the syndrome. This case report presents a variant of CBS as consequence of an ischaemic stroke in left occipitotemporal regions. In our view, the particularities and variations of CBS should be widespread, as it can be the only manifestation of an ischaemic stroke that requires appropriate and immediate management.
You can read the full case report here and you can find more articles from the latest issue here.
First published on ScienceDaily.com
Aggressive treatment of hypertension in stroke patients could do more harm than good in the long term, according to a new study from researchers at the University of Georgia.
Sixty percent of stroke patients admitted to U.S. emergency rooms have elevated blood pressure, and many studies say that having high blood pressure at the time of stroke can lead to higher rates of death and major disability.
But lowering blood pressure too much with medications may actually be working against the body’s protective response to maintain blood flow into the affected brain tissues.
“This presents a clinical dilemma,” said study author Changwei Li, an assistant professor of epidemiology and biostatistics at UGA’s College of Public Health.
It may be better to keep blood pressure a little higher than normal, closer to 140/90 mmHg rather than a “good” blood pressure of 120/80 mmHg, but that leaves the question of best practices a little open-ended.
“Currently, hypertension treatment for acute stroke patients is based on physicians’ clinical experience and judgement,” said Li. “There is no guideline on how low the blood pressure should be maintained.”
The key is to find the right balance between maintaining blood flow to the brain and reducing negative short- and long-term effects.
To help identify this optimal blood pressure, Li and his co-authors looked at the relationship between blood pressure during stroke and both short- and long-term health outcomes for over 4,000 Chinese stroke patients participating in the China Antihypertensive Trial in Acute Ischemic Stroke study. One group of stroke patients received extensive treatment for high blood pressure while a control group received no treatment at the time of their stroke.
Li and his collaborators tracked blood pressure changes over time in both the treatment and control groups during the first week of hospital admission and compared patient health at one week, three months, one year and two years following the stroke across patients of different blood pressure trajectories.
To access the full article, please click here.
Story Source:University of Georgia. “Optimal blood pressure treatment for stroke patients.” ScienceDaily. ScienceDaily, 10 December 2018. <www.sciencedaily.com/releases/2018/12/181210142059.htm>.
First published on ScienceDaily.com
Some patients with coronary artery disease have inadequate blood flow to the heart muscle during periods of mental/emotional stress. This condition — called “mental stress-induced myocardial ischemia” (MSIMI) — is related to the severity of plaque buildup in the coronary arteries in men but not women, reports a study in Psychosomatic Medicine: Journal of Biobehavioral Medicine, the official journal of the American Psychosomatic Society. The journal is published in the Lippincott Portfolio by Wolters Kluwer.
Mental stress-induced myocardial ischemia occurs in both men and women, although younger women tend to have more of this phenomenon. While MSIMI is linked to worse cardiovascular outcomes in both sexes, there may be sex differences in the mechanism through which stress can trigger MSIMI, according to new research by Viola Vaccarino, Md, PhD, and colleagues, of Emory University School of Public Health and School of Medicine, Atlanta.
Heart Response to Stress Linked to Coronary Plaque Severity in Men, but Not Women
The researchers examined the sex-specific association between coronary plaque buildup (obstructive coronary disease) assessed from angiograms and MSIMI in 276 participants — 141 men and 135 women — with recent myocardial infarction (heart attack). The study targeted young and middle-aged adults (under age 61). All participants underwent conventional stress testing to evaluate myocardial blood flow in response to a physical or pharmacological challenge (either an exercise stress test or a pharmacological stress test) .
The patients also underwent a mental stress test, which evaluated myocardial blood flow in response to a stressful situation (a public speaking task). Based on a reduction in myocardial blood flow during this stressful challenge, 17 percent of patients were classified as having MSIMI.
Women had a higher rate of MSIMI (20 percent) than men (15 percent). Twenty-seven percent of patients had conventional stress-induced myocardial ischemia (CSIMI). Only 10 percent of patients had both MSIMI and CSIMI.
In both men and women, the presence of CSIMI was associated with greater obstructive coronary disease severity. For each one-unit increase in severity score, the likelihood of CSIMI increased by about 50 percent, after adjustment for other factors.
In contrast, the presence of MSIMI was associated with more severe plaque buildup only in men: for each one-unit increase in severity score, the likelihood of MSIMI nearly doubled. For women, MSIMI was unrelated to obstructive coronary disease severity.
“There is growing evidence that psychosocial stressors may promote the development and progression of cardiovascular disease in susceptible individuals,” according to the authors. However, the relationship between MSIMI and obstructive coronary disease, which means blockages in the major coronary arteries supplying blood to the heart muscle, has been unclear. Women are more likely than men to develop myocardial ischemia without coronary obstruction.
The results support the hypothesis that MSIMI may develop via different mechanisms in women versus men. Consistent with previous findings on sex differences in heart disease, it may be that MSIMI in women mainly reflect abnormalities other than blockage of the coronary arteries, such as malfunction of the smaller coronary blood vessels (microcirculatory dysfunction).
The sex differences may have important implications for understanding sex-specific vascular effects of psychological stress in general and the mechanisms of MSIMI in particular, since most previous studies of this issue have focused on men. Dr. Vaccarino and colleagues conclude, “These results suggest that MSIMI must be driven by alternative mechanisms especially among women, and provide motivation for further research to understand sex-specific mechanisms for the effects of mental stress on myocardial ischemia and long-term outcomes.”
Story Source:Wolters Kluwer Health. “Stress-induced effects on heart blood flow differ for men versus women.” ScienceDaily. ScienceDaily, 26 November 2018. <www.sciencedaily.com/releases/2018/11/181126154101.htm>.
Published first on ScienceDaily.com
People who experience migraine with visual aura may have an increased risk of an irregular heartbeat called atrial fibrillation, according to a study published in the November 14, 2018, online issue of Neurology®, the medical journal of the American Academy of Neurology. Migraine with visual aura is when disturbances in vision occur right before head pain begins. Those disturbances may include seeing wavy lines or flashes of light, or having blurry vision or blind spots.
With atrial fibrillation, a form of arrhythmia, the heart’s normal rhythm is out of sync. As a result, blood may pool in the heart, possibly forming clots that may go to the brain, causing a stroke.
“Since atrial fibrillation is a common source of strokes caused by blood clots, and previous research has shown a link between migraine with aura and stroke, we wanted to see if people who have migraine with aura also have a higher rate of atrial fibrillation,” said study author Souvik Sen, MD, MS, MPH, of the University of South Carolina in Columbia. “Atrial fibrillation can be managed through medication, but many people do not realize that they have atrial fibrillation.”
For the study, 11,939 people with an average age of 60 without prior atrial fibrillation or stroke were evaluated for headache. Of those 9,405 did not have headache and 1,516 had migraine. Of those who had migraine, 426 had migraine with visual aura. The participants were followed for up to 20 years.
During the study, 1,623 people without headache, or 17 percent, developed atrial fibrillation while 80 of 440 people with migraine with aura, or 18 percent, developed the condition and 152 of 1,105 people with migraine without aura, or 14 percent.
After adjusting for age, sex, blood pressure, smoking and other factors that could affect risk of atrial fibrillation, people with migraine with aura were found to be 30 percent more likely to develop the condition than people who did not have headaches and 40 percent more likely to develop atrial fibrillation than people with migraine with no aura.
The results translate to an estimated nine out of 1,000 people with migraine with aura having atrial fibrillation compared to seven out of 1,000 people with migraine without aura. Researchers also found that the rate of stroke in the migraine with aura group was four out of 1,000 people annually compared to two out of 1,000 people annually in those with migraine without aura, and three of 1,000 people annually in those with no headache.
“Our research suggests that atrial fibrillation may play a role in stroke in those with migraine with visual aura,” said Sen. “It is important to note that people with migraine with aura may be at a higher risk of atrial fibrillation due to problems with the autonomic nervous system, which helps control the heart and blood vessels. More research is needed to determine if people with migraine with visual aura should be screened for atrial fibrillation.”
A limitation of the study was that the definition of migraine may have left out people who had migraines that lasted less than one year or who had a history of migraine at younger ages. There was also limited information on migraine medications that may influence heart rate.
The study was supported by the National Heart, Lung and Blood Institute and the American Heart Association.
Story Source:American Academy of Neurology. “Migraines that affect vision may increase risk of irregular heartbeat.” ScienceDaily. ScienceDaily, 14 November 2018. <www.sciencedaily.com/releases/2018/11/181114162032.htm>.
Published first on ScienceDaily.com
Exposure to environmental noise appears to increase the risk of heart attacks and strokes by fueling the activity of a brain region involved in stress response. This response in turn promotes blood vessel inflammation, according to preliminary research to be presented in Chicago at the American Heart Association’s Scientific Sessions 2018, a premier global exchange of the latest advances in cardiovascular science for researchers and clinicians.
The findings reveal that people with the highest levels of chronic noise exposure — such as highway and airport noise — had an increased risk of suffering cardiovascular events such as heart attacks and strokes, regardless of other risk factors known to increase cardiovascular risk.
The results of the study offer much-needed insight into the biological mechanisms of the well-known, but poorly understood, interplay between cardiovascular disease and chronic noise exposure, researchers said.
“A growing body of research reveals an association between ambient noise and cardiovascular disease, but the physiological mechanisms behind it have remained unclear,” said study author Azar Radfar, M.D., Ph.D., a research fellow at the Massachusetts General Hospital in Boston. “We believe our findings offer an important insight into the biology behind this phenomenon.”
Researchers analyzed the association between noise exposure and major cardiovascular events, such as heart attacks and strokes, among 499 people (average age 56 years), who had simultaneous PET and CT scan imaging of their brains and blood vessels. Diagnostic validation was done in a subset of 281 subjects.
All participants were free of cardiovascular illness and cancer at baseline. Using those images, the scientists assessed the activity of the amygdala — an area of the brain involved in stress regulation and emotional responses, among other functions. To capture cardiovascular risk, the researchers examined the participants’ medical records following the initial imaging studies. Of the 499 participants, 40 experienced a cardiovascular event (e.g., heart attack or stroke) in the five years following the initial testing.
To gauge noise exposure, the researchers used participants’ home addresses and derived noise level estimates from the Department of Transportation’s Aviation and Highway Noise Map.
People with the highest levels of noise exposure had higher levels of amygdalar activity and more inflammation in their arteries. Notably, these people also had a greater than three-fold risk of suffering a heart attack or a stroke and other major cardiovascular events, compared with people who had lower levels of noise exposure. That risk remained elevated even after the researchers accounted for other cardiovascular and environmental risk factors, including air pollution, high cholesterol, smoking and diabetes.
Additional analysis revealed that high levels of amygdalar activity appears to unleash a pathway that fuels cardiac risk by driving blood vessel inflammation, a well-known risk factor for cardiovascular disease.
The researchers caution that more research is needed to determine whether reduction in noise exposure could meaningfully lower cardiovascular risk and reduce the number of cardiovascular events on a population-wide scale.
In the meantime, however, the new study findings should propel clinicians to consider chronic exposure to high levels of ambient noise as an independent risk factor for cardiovascular disease.
“Patients and their physicians should consider chronic noise exposure when assessing cardiovascular risk and may wish to take steps to minimize or mitigate such chronic exposure,” Radfar said.
Story Source:American Heart Association. “Chronic exposure to excess noise may increase risk for heart disease, stroke.” ScienceDaily. ScienceDaily, 5 November 2018. <www.sciencedaily.com/releases/2018/11/181105081749.htm>.