National Letter of Intent. The National Letter of Intent (NLI) is a document used to indicate a student athlete's commitment to participating National Collegiate Athletic Association (NCAA) colleges and universities in the United States.
Collateral Vessel Closure. Collateral vessels are abnormal blood vessels that connect the aorta with the pulmonary arteries. The aorta is a blood vessel that carries blood from the heart to arteries throughout the body.Pulmonary arteries are the vessels that transfer blood from the heart back to the lungs for oxygen.Everyone has collateral vessels, but they're normally small and not in use.They become enlarged in some people with congenital heart disease (heart disease that's present since birth).ulmonary arteries are the vessels that transfer blood from the heart back to the lungs for oxygen. Everyone has collateral vessels, but they're normally small and not in use. They become enlarged in some people with congenital heart disease (heart disease that's present since birth).
INTRODUCTION. Anastomotic channels, known as collateral vessels, can develop in the heart as an adaptation to ischemia [ 1,2 ]. They serve as conduits that bridge severe stenoses or connect a territory supplied by one epicardial coronary artery with that of another [ 3 ].NTRODUCTION. Anastomotic channels, known as collateral vessels, can develop in the heart as an adaptation to ischemia [ 1,2 ]. They serve as conduits that bridge severe stenoses or connect a territory supplied by one epicardial coronary artery with that of another [ 3 ].