The National Heart, Lung, and Blood Institute (NHLBI) is an institute within the National Institutes of Health that leads global efforts in research, training, and education to promote the prevention and treatment of heart, lung, and blood diseases. The institute aims to enhance the health of individuals, enabling them to live longer and more fulfilling lives.The National Heart, Lung, and Blood Institute (NHLBI) is an institute within the National Institutes of Health that leads global efforts in research, training, and education to promote the prevention and treatment of heart, lung, and blood diseases. The institute aims to enhance the health of individuals, enabling them to live longer and more fulfilling lives.