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.
Cardiac intervals in stage 46 X. laevis embryos treated with chronotropic medications as measured by video analysis. *Statistically significant difference (P < 0.05 by Tukey’s F test) compared with the cisatracurium paralyzed control group (n = 53; open bars). Left, time scale AA interval and VV interval. Right, time scale for the A duration, V duration, and AV interval. †No measurable AV interval due to second- or third-degree heart block.
