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.
The heart rate is that of the underlying atrial or sinus rhythm. The QRS complexes are usually normal with first degree block. However, they may rarely be abnormal because of a preexisting bundle branch block. Typically, the AV conduction ratio is 1:1, that is, a QRS complex follows each P wave.