Articles tagged with Blood Flow
Researchers identify gene variation associated with mental stress-induced ischemia, a condition that increases the risk of heart attack and sudden death. About two-thirds of patients with coronary artery disease experience detectable mental stress-induced reductions in blood flow to the heart.
A recent study found that contrast-enhanced MRI significantly outperforms 16 slice multidetector CT in detecting endoleaks after endovascular repair of abdominal aortic aneurisms. The study detected 21 endoleaks in 18 patients with 100% sensitivity and accuracy on MRI, while MDCT had lower detection rates.
A recent study found that even light loads of 26 pounds can decrease upper extremity blood flow, contributing to shoulder fatigue. Backpack straps typically compress the axillary vein, causing abnormally high blood pressure and subsequent decreased blood flow in the shoulders and arms.
Researchers discovered that diabetes drives inflammation and slows blood flow, accelerating atherosclerosis through interference with ERK5 signaling. The study identifies advanced glycation end products (AGEs) as key molecules sabotaging this protective mechanism.
Researchers at Duke University Medical Center discovered a genetic mutation linked to peripheral artery disease (PAD), which affects blood flow in the legs. The study found that one strain of mice with surgically-induced PAD-like injury showed greater tissue loss and poor recovery, while another strain recovered well.
A study published in Circulation Research reveals that flexing muscles send biochemical signals through nearby matrix proteins, increasing blood flow and potentially reversing poor circulation and healing chronic wounds. The discovery sheds light on the role of extracellular matrix proteins like fibronectin in controlling bodily function.
A recent study by Weill Cornell Medical College reveals that the brain contains its own store of tissue plasminogen activator (tPA), a powerful enzyme that boosts blood flow to brain cells via nitric oxide synthase. This finding has significant implications for understanding stroke and Alzheimer's disease, and may lead to new treatments.
Researchers found that brief periods of blocked blood flow activate a protective molecular pathway in the heart, protecting it from damage caused by restored blood flow. The study suggests that these 'mini stress tests' may help precondition and protect the heart from future attacks.
Researchers found vasopressin significantly reduces blood flow to vital organs like the liver and pancreas, but not the heart. The study used pigs to test vasopressin's effects on sepsis and found severe disturbances in blood flow.
Prelox, a patented blend of Pycnogenol and L-Arginine, shows significant improvement in men with ED after just one day, increasing nitric oxide production for enhanced blood flow. The study achieved almost 100% increase in orgasmic function, sexual desire, and overall satisfaction.
Researchers at Ohio State University Medical Center found that the mitochondria send a death signal to cardiac cells when blood flow is restored, leading to cell damage and weakening heart function. The study identifies a specific enzyme, mitochondrial nitric oxide synthase, as a potential therapeutic target to stop this process.
Researchers found that Tibetans have 10 times more nitric oxide in their blood than low-altitude dwellers, leading to increased blood flow and improved oxygen delivery. This adaptation allows them to thrive at high altitudes despite low oxygen levels in the air.
A study found that Pycnogenol enhances healthy nitric oxide production, leading to increased blood flow and oxygen supply to muscles. The supplement allows for better expansion of arteries, meeting the enhanced oxygen demand of performing muscles.
MIT scientists propose that blood modulates how neurons process information and regulate brain activity. Blood flow affects the activity of nearby neurons, changing how they transmit signals and hence regulating information flow throughout the brain.
Researchers found that people with high blood pressure require more coordinated brain blood flow to perform memory tasks, even after treatment. This increased coordination was observed in the four areas of the brain involved in memory: thalamus, posterior parietal, prefrontal area, and hippocampus.
Researchers found that administering hydrogen sulfide directly into the heart during a simulated heart attack significantly reduces tissue and cell damage. The study showed a 72% reduction in severe heart-tissue death after restoring normal oxygen and blood flow.
Researchers at Ohio State University have identified a molecule that can reverse damage and help restore blood flow to vessels constricted during a heart attack. The treatment involves delivering tetrahydrobiopterin directly to the vessels, which can improve outcomes for patients with acute coronary episodes.
Researchers developed a blood-flow detector software to track changes in brain blood flow in real-time, showing promise in preventing brain damage and death. The system is designed for children with head injuries, offering potential lifesaving benefits.
Researchers found that antidepressant medicines normalized decreased brain blood flow in patients with depression, while electroconvulsive therapy was associated with additional decreases. Objective imaging evaluations may support subjective clinical decisions in treating depression.
A preliminary study suggests that administering a blood clot-dissolving medication within 24 hours of severe frostbite injury can significantly reduce the risk of amputation. The treatment, tissue plasminogen activator (tPA), has been shown to improve blood flow and prevent cell death in affected limbs.
A 42-year-old Canadian patient developed compartment syndrome and underwent emergency fasciotomies, resulting in dark greenish-black blood analysis. Sulfhaemoglobinemia was diagnosed as the cause, linked to excessive sumatriptan intake, a medication containing a sulfonamide group.
A small study published in Heart reveals that low tar cigarettes, like regular ones, severely impair blood flow through the heart. The researchers found that both groups of smokers showed significant declines in coronary flow velocity reserve after smoking, regardless of cigarette type.
Experts disagree on the criticality of a 90-minute door-to-balloon time in heart attack treatment. Dr. Eric R. Bates believes that timely balloon inflation is crucial for better outcomes, while Dr. Timothy D. Henry argues that an arbitrary deadline may be counterproductive in some cases.
A new study finds that exposure to phenanthraquinone, a chemical component of diesel exhaust particles, can impair the ability of resistance arteries to regulate blood flow to bone marrow. The study, conducted on animal models, reveals that post-menopausal females and elderly males are most likely to be impacted.
A new Mayo Clinic study found that heart patients' likelihood of receiving a drug-eluting stent varies greatly by insurance type, hospital location, and procedural volume. Patients with private insurance are more likely to receive a drug-eluting stent than those with Medicare or Medicaid, while hospitals serving large numbers of Medica...
Recent studies suggest that flavanol-rich cocoa can enhance brain blood flow, potentially improving cognitive function and learning. Researchers found significant correlations between flavanol consumption and reduced rates of heart disease and cancer among the Kuna Indians in Panama.
Scientists have made a surprising connection between Alzheimer's disease and the body's arterial system. Reduced blood flow in the brain precedes cognitive decline in patients with Alzheimer's disease.
Researchers at the University of Vermont have clarified the cellular process responsible for signaling regional blood flow changes in the brain. Astrocytes play a crucial role in communicating with blood vessels through potassium ions, leading to rapid dilation and increased local blood flow.
A team of physicists and neuroscientists has discovered a bottleneck in the brain's blood supply, specifically in penetrating arterioles, which makes it vulnerable to strokes. This finding may explain the origin of gray matter damage detected in brain scans, especially among the elderly.
A study by researchers at the University of Pennsylvania School of Medicine has identified a key regulatory protein, Klf2, that translates blood flow into gene expression. Klf2 is activated by rapid, pulsed blood flow and plays a crucial role in maintaining vessel tone and regulating smooth muscle contraction.
Researchers found that different parts of the brain are activated depending on the cause of itching, with allergen-induced itches activating the supplementary motor and posterior parietal areas. Histamine-induced itches, on the other hand, activate a smaller area of the brain, suggesting a compulsion to scratch in those cases.
Researchers develop a 3D model of a child's heart using MRI scans to simulate blood flow and optimize surgical procedures for complex congenital heart defects. The system aims to improve quality of life for children with single-ventricle hearts by reducing the need for multiple surgeries.
Researchers found that diastolic heart failure patients have severely reduced exercise tolerance despite normal leg blood flow, suggesting other factors such as muscle oxygen use contribute to symptoms. The study suggests targeting these additional factors could help develop effective treatments for this common form of heart failure.
Researchers have developed a fast and accurate test to track slowed blood flow in dogs, detecting early signs of blocked arteries. The 64-slice CT scanner can replace traditional tests like exercise stress testing and echocardiograms, providing a safe and non-invasive method to diagnose coronary disease.
A team of researchers has developed a model that tests Pe-ter Richardson's long-held hypothesis about the formation of blood clots. The model, which uses high-speed computing, reproduces several odd features of thrombus growth observed in laboratory experiments and tissue pathologies.
Researchers have found that a neurotransmitter pathway in the skin, involving substance P and its related receptor, may play a key role in temperature regulation. By blocking this pathway, they found reduced blood flow to the skin, suggesting more than one mechanism is involved in regulating body temperature.
A study published in Angiology found that Pycnogenol, an antioxidant extract from pine tree bark, significantly improved blood flow and reduced swelling in patients with diabetic microangiopathy. Blood flow improvements were 34% when lying down and 68% when standing up.
Current brain cooling devices may not be effective in reducing injury from stroke and head trauma as they can't penetrate deeply into the brain. The new findings suggest that most patients won't benefit from these techniques, and a different approach is needed for certain patients.
Researchers found that flavanol-rich cocoa can improve blood flow in menopausal women with elevated cholesterol, as well as increase brain blood flow in elderly and young adults. Cocoa flavanols may also have beneficial effects on platelets and reduce the risk of vascular damage.
Researchers found that using a suction device during minimally invasive angioplasty and stenting improves kidney function, reducing damage to the kidneys. The study suggests that this technique can lead to better outcomes and more effective treatments for patients with renal artery stenosis.
Research suggests that phosphodiesterase-5 inhibitors (PDE-5i) have mostly positive effects on various organ systems, including the blood, heart, lungs, and brain. The drugs are effective in treating erectile dysfunction even for men with diabetes, high blood pressure, and ischemic heart disease.
Researchers found a significant decrease in muscle cramps with Pycnogenol supplementation, including a 25% reduction for normal crampers and a 40% reduction for those with venous insufficiency. The study also showed improved blood flow to muscle tissue, reducing pain in patients with diabetic microangiopathy.
Researchers at Cornell University are developing tiny, implantable sensors that can measure blood flow, temperature and pressure in real-time. The technology has the potential to enhance patient monitoring tools and create microscopic implants or sensor systems integrated with present equipment.
Researchers found that atorvastatin increased circulating endothelial precursor production by 1.7 to 8-fold in SSc patients, improving Raynaud's phenomenon activity but symptoms generally returned to baseline after discontinuation.
A new study found that high-flavanol cocoa improves skin structure and function, increasing hydration and decreasing skin roughness. The study suggests that the benefits of cocoa flavanols may be due to improved blood flow to the skin.
Researchers aim to identify patients at high risk of aneurysm rupture using computer simulations of blood flow. The study uses geometric models and fluid dynamics programs to analyze blood flow characteristics and predict patient-specific risks.
Researchers found that long-term use of statins increased retinal blood flow and reduced intraocular pressure in healthy men. The findings suggest a potential therapy for diabetic retinopathy, a condition linked to reduced blood flow in the eye.
A study found that mental stress can reduce heart blood flow in patients with coronary artery disease, even those without symptoms of ischemia during physical stress tests. Six out of 29 patients showed signs of ischemia on images produced after a mentally stressful role-playing scenario.
Researchers found that a third of patients without signs of reduced blood flow during exercise testing had temporary changes in heart rhythm or restricted blood flow when role-playing stressful situations. This phenomenon may indicate more severe coronary artery disease in these patients.
Researchers found that Crohn's disease patients produce lower quantities of neutrophils and inflammatory mediators in response to trauma, leading to delayed blood flow and persistence of bacteria. Treatment with Viagra corrected abnormally low blood flow, suggesting a potential role for the drug in treating the disease.
Researchers found that watching comedy films increased brachial artery blood flow in 19 out of 20 participants, while sad movies reduced it. The impact was equivalent to a bout of aerobic exercise or starting statin treatment.
Research suggests that caffeine may impair peak heart function by blunting the increase in myocardial blood flow needed during exercise. The study found significant reductions in blood flow measurements after caffeine intake, particularly in individuals with reduced coronary flow reserve.
Researchers at the University of Rochester Medical Center have discovered that astrocytes control blood flow in the brain, challenging the long-held assumption that neurons are the primary drivers. This finding has significant implications for our understanding of Alzheimer's disease, which may be more complex than previously thought.
A new UCSD laser technique allows researchers to precisely create and image blood clots in the brain in real time, shedding light on small strokes implicated in dementia. The study enables controlled observation of brain response to stroke, paving the way for potential prevention strategies.
Researchers at Emory University Health Sciences Center found that administering neuregulin-1 reduces cell death by 90% and protects neurons from damage after surgically induced strokes. The compound's therapeutic window is longer than existing treatments, offering potential for new stroke therapies.
A team led by Dr. Rajabrata Sarkar identified the MMP2 gene as essential for growing new arteries when existing arteries are blocked. In mice, the specific DNA sequences of the MMP2 gene that are expressed during artery growth were also discovered, shedding light on the normal process of angiogenesis.
The study used functional magnetic resonance imaging (fMRI) to detect an increase in blood flow to the prefrontal cortex in individuals subjected to stress. The results showed that the effects of stress are more persistent than previously thought, remaining even when the stressor was removed.
Researchers identify thrombospondin (TSP-1) as a potential target for preventing acute kidney failure. Studies in mice show that the protein causes irreversible kidney damage when blood flow is disrupted, but genetically engineered mice lacking TSP-1 are protected from damage.
Researchers found that phenolic compounds in olive oil improved endothelial function and reduced oxidative stress. The study suggests a possible mechanism by which the Mediterranean diet's health benefits are achieved, but further research is needed to confirm these findings.
UT Southwestern researchers found that heart failure patients with impaired skin-blood flow responses are at risk of heat-related complications. The study suggests that these patients should be more aware of the heat and seek shade or air-conditioned environments if feeling overheated.