Sand should be part of the topdressing used to topdress your field after aerating and before overseeding. However, this section on sand is for a different use of sand. Sanding the baseball field turf, especially the infield, is a good practice.and should be part of the topdressing used to topdress your field after aerating and before overseeding. However, this section on sand is for a different use of sand. Sanding the baseball field turf, especially the infield, is a good practice.
Atrioventricular (AV) Block. A slow heart rate can be due to many causes, including the earlier described sick sinus syndrome (SSS). Another cause, atrioventricular block (AV block), is due to abnormally slowed electrical conduction of the sinus impulse through the AV node.
Cause and Risk Factors. AVN may be caused by an injury, such as a dislocated joint, called trauma-related avascular necrosis, or by various risk factors, called non-traumatic avascular necrosis. When a joint is fractured or dislocated, damage to the blood vessels may occur, compromising blood flow.