TESCAN’s unique Ultra High Resolution Brightbeam™ column featured on TESCAN’s AMBER FIB-SEM and TESCAN AMBER X plasma FIB-SEM enables the observation of any sample, including materials with ...

DEAR DR. ROACH: What’s the difference between atrial fibrillation and premature ventricular contractions, aka PVCs (extra heartbeats)? -- M.

A-Fib, as the condition is commonly known, has been on the rise for at least the past decade, driven by the aging of the population, along with increasing rates of hypertension, diabetes and obesity.

A-fib causes the heart to beat irregularly and often very fast. It's caused by a defect in the heart's electrical system that causes many impulses to fire rapidly at the same time, rather than in ...