Skip to main content
. Author manuscript; available in PMC: 2012 Jul 5.
Published in final edited form as: J Am Coll Cardiol. 2011 Jul 5;58(2):147–154. doi: 10.1016/j.jacc.2010.10.069

Figure 2. Tracings from two preparations with normal and incomplete relaxation.

Figure 2

Both preparations were paced at 180/min when the stimulation was stopped. After allowing the preparation to establish a stable resting tension, BDM, a reversible crossbridge inhibitor, was added to the circulating solution. This revealed a substantial resting tone in the preparation with incomplete relaxation. No resting tone was found in preparations that showed normal relaxation characteristics with tachycardia.