Defect In Cardiac Cells Lead To Heart Failures
...um stored in the SR determines the strength of the heartbeat and how much blood the heart ejects when it contracts. At the end of a contraction, the channels close tightly. Molecular pumps, also located in the walls of the SR, then suck the released calcium back into the SR to prepare for the next contraction....Stem Cells Could Replace Electronic Pacemakers
... freezing), electrical measurements revealed a new heartbeat (slower) created by the addition of the human cells. The new electrical signal was traced to the human cells, made easier to locate by their fluorescent glow.The implanted cells also responded appropriately to drugs used to slow or speed the heart ra...Making MRIs Safe for Patients With Implantable Heart Devices
...d implantable devices used to regulate an abnormal heartbeat known as arrhythmia. Researchers say doctors have feared that the electromagnetic fields of the MRI may heat up metal components of the device, dislodge it, and cause tissue damage, device malfunction, or possibly death. However, many people with the...New molecule to treat brain disorders found
...cule that plays important roles in controlling the heartbeat and normal sleep may also prove useful in treating these disorders of the brain and nervous system. When tested on rat brain cells in the laboratory, the molecule, adenosine, mimicked the beneficial effects of naturally occurring chemicals know...Abnormal heart rate and depression may increase death risk
... is often called abnormal heart rates. An abnormal heartbeat may happen due to coronary artery disease, electrolyte imbalance in the blood, changes in the heart muscle, injury from the heart attack, or healing after a heart surgery. Researchers from the study points out that treatments to alleviate the depres...Being Overweight Could Lead To Irregular Heartbeats
...are significantly more likely to have an irregular heartbeat // according to a recent study . They say that th...ple are receiving treatments aimed at bringing the heartbeat back to normal. Researchers say they have found the link between obesity and atrial fibrillation, a...Oxygen Consumption During Workouts Could Indicate Heart Problems
... minutes // of exercise, the amount of oxygen per heartbeat increases and continues to rise as the heart carries the oxygen to the blood. Researchers studied nearly 100 patients between ages 55 and 75 who had mild hypertension. Researchers measured the patients’ heart sizes and performance at rest by using ...Identifying Irregular Heart Beats
...hers according to a recent finding.// An irregular heartbeat -- or atrial fibrillation -- is a major risk factor for stroke. An atrial fibrillation causes the heart to quiver, which can lead to pooling and clotting of blood. If a blood clot breaks away and goes to the brain, a stroke results. In a large clin...A New Option for Patients Suffering From QT Syndrome
...long QT syndrome. Beta-blockers can also slow the heartbeat and prevent arrhythmias in LQTS patients. However, about a fourth of patients continue to experience symptoms while on the medication. One current treatment method involves an implanted defibrillator that automatically delivers a shock to the heart...Stress can Trigger Heart Problems
...ific evidence that mental stress alone can trigger heartbeat irregularities. Arrhythmias are disturbances // in normal heart rhythm. Researchers studied the variation in heart rhythms while patients were under mental and physical stress. They included patients who were at risk for arrhythmias and healthy patie...Oxygen Usage During Exercise Could Indicate Heart Problems
... few minutes of exercise, the amount of oxygen per heartbeat increases and continues to rise as the heart carries the oxygen to the blood.// A new study shows less oxygen to the body after the first few minutes of exercise could signal heart trouble. Researchers studied nearly 100 patients between ages 55 and...Heart bypass-mental decline link
...to put oxygen into the blood and circulate it. The heartbeat is stopped with medication, and a thin tube is inserted into the aorta during the procedure. The study compared results in heart-lung machine patients with those put on an "off-pump" device that only partially immobilizes the heart. Off-pump patient......milar to a pacemaker, which operates only when the heartbeat starts to get out of step. Mathematicians at the...s a better chance of detecting temporal changes in heartbeat rhythm and placing them in the context of the individual patients' health. The reliability of it...