Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Hyperemic/baseline (H/B) coronary velocity and systolic/diastolic (S/D) area ratios at 5 time points before and after TAC. H/B is an index of coronary flow reserve and is progressively reduced and nearly abolished (1.1) after 21 days of aortic constriction. Similarly, the amount of coronary flow that occurs during systole increases progressively and significantly after aortic constriction.
