Commotio cordis. Commotio cordis (Latin, agitation of the heart) is an often lethal disruption of heart rhythm that occurs as a result of a blow to the area directly over the heart (the precordial region), at a critical time during the cycle of a heart beat causing cardiac arrest.
A ZIP Code is a five digit number that identifies a specific geographic mail delivery area. The acronym ZIP refers to Zone Improvement Plan, a plan implemented by the USPS in the early 1960âs to improve the sorting and delivery of mail. There are approximately 43,000 ZIP Codes in the United States.
Area codes are used to route phone calls to a specific geographic area within a country. All area codes in the United States are exactly 3-digits long. In the past, a given region often had just one area code. Nowadays, many cities and towns in denser urban areas, including San Diego, have 2 or more area codes.