This week Consumer Reports released news that arsenic was found in brown rice, white rice, rice breakfast cereals, organic rice baby cereal, and other rice productsââmany at worrisome levelsââin tests they performed.
First-degree heart block. First-degree AV block is defined as a PR interval longer than 0.2 seconds. Each atrial activation leads to a ventricular activation with a 1:1 correspondence.
Noun. 1. heart block-recurrent sudden attacks of unconsciousness caused by impaired conduction of the impulse that regulates the heartbeat. Adams-Stokes syndrome, atrioventricular block, Stokes-Adams syndrome. arrhythmia, cardiac arrhythmia-an abnormal rate of muscle contractions in the heart.