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.
Reference=no arrhythmia. AV indicates atrioventricular; BB, bundle branch; ICU, intensive care unit; PM, premature; and RR, relative rate.
