Figure 1.
Electrocardiogram traces show examples of occasional premature ventricular contraction (PVC) (Top), bigeminy (Middle), and multiform PVCs (Bottom) induced by caffeine and dobutamine challenge in a rat.
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.