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.
It is important to realize that not all patients with AV dissociation have complete heart block. For example, patients with ventricular tachycardia have AV dissociation, but not complete heart block; in this example, AV dissociation is due to the ventricular rate being faster than the intrinsic sinus rate.