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).
The study, published online today in the European Heart Journal, shows that patients with lots of these vessels have a 36% reduced risk of mortality, highlighting their importance as a therapeutic target. Coronary collaterals are tiny, specialised blood vessels that connect the larger vessels in the heart. They can be thought of as the heartâs âback-up systemâ as they are essentially invisible until activated, when they can enlarge their diameters in order to carry significant blood flow and bypass blockages.