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Latest Cardiac pacemaker Stories

Understanding The Link Between Age And Decreased Maximum Heart Rate
2013-10-15 07:29:52

[ Watch the Video: Link Between Age And Decreased Maximum Heart Rate ] April Flowers for redOrbit.com - Your Universe Online As we age, our maximum heart rate (maxHR) decreases, limiting the performance of aging athletes. Decreased maxHR is also a leading cause for nursing home admittance for otherwise-healthy elderly individuals who no longer have the physical capacity required for independent living. Until now, however, the reasons for decreased maxHR due to age have been unclear....

Heart Cells Turned Into Biological Pacemaker
2012-12-17 10:59:49

Brett Smith for redOrbit.com - Your Universe Online Cardiologists from The Cedars-Sinai Heart Institute in Los Angeles have announced the development of a biologically-based pacemaker by reprogramming ordinary heart cells using the introduction of a single gene - Tbx18. "Although we and others have created primitive biological pacemakers before, this study is the first to show that a single gene can direct the conversion of heart muscle cells to genuine pacemaker cells. The new cells...

2011-09-09 13:29:04

Ion channels ensure the heart keeps time The heartbeat is the result of rhythmic contractions of the heart muscle, which are in turn regulated by electrical signals called action potentials. Action potentials result from the controlled flow of ions into heart muscle cells (depolarization) through channels in their membranes, and are followed by a compensating reverse ion current (repolarization), which restores the original state. If the duration of the repolarization phase is not just...

2011-08-11 06:42:48

(Ivanhoe Newswire) -- A new technique that stimulates heart muscle cells with low-energy light raises the possibility of a future light-controlled pacemaker, according to this study. "Electronic cardiac pacemakers and defibrillators are well established and successful technologies, but they are not without problems, including the breakage of metal leads, limited battery life and interference from strong magnetic fields," Emilia Entcheva, Ph.D., senior author of the study and associate...

2011-08-02 14:11:11

An international team of molecular scientists have discovered that star ascidians, also known as sea squirts, have pacemaker cells similar to that of the human heart. The research, published in the JEZ A: Ecological Genetics and Physiology, may offer a new insight into the early evolution of the heart as star ascidians are one of the closest related invertebrates to mammals. The research team, led by Annette Hellbach from the Max Planck Institute of Biochemistry in Germany, expected to find...

2011-03-09 14:40:50

Pacemaker cells in the sinoatrial node control heart rate, but what controls the ticking of these pacemaker cells? New research by Angelo Torrente and his colleagues of the M.E. Mangoni group's, reveals, for the first time, a critical functional interaction between Cav1.3 calcium ion (Ca2+) channels and ryanodine-receptor (RyR) mediated Ca2+ signaling. The study also sheds light on a long-standing debate regarding the relative contributions of the 'funny current' generated by ion channels and...

2011-01-26 13:09:34

New finding adds significantly to our understanding of calcium channel function in health and disease Scientists in the Hotchkiss Brain Institute at the Faculty of Medicine, University of Calgary, have discovered a new mechanism that nerve cells (neurons) use to fine-tune their electrical output. The exciting discovery, published this week in the prestigious journal Nature Neuroscience, provides new insights about how the activity of the nervous system is regulated at the cellular level....

2010-11-15 13:35:56

Findings pave way for better understanding of abnormal heart rhythms and sudden cardiac death Scientists studying genetic data from nearly 50,000 people have uncovered several DNA sequence variations associated with the electrical impulses that make the heart beat. The findings, reported in Nature Genetics, may pave the way for a greater understanding of the mechanisms for abnormal heart rhythms and sudden cardiac death. "Regulation of the heart's rhythm is exceedingly complex," says...


Word of the Day
tesla
  • The unit of magnetic flux density in the International System of Units, equal to the magnitude of the magnetic field vector necessary to produce a force of one newton on a charge of one coulomb moving perpendicular to the direction of the magnetic field vector with a velocity of one meter per second. It is equivalent to one weber per square meter.
This word is named for Nikola Tesla, the inventor, engineer, and futurist.