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.
Concordant APD alternans in ionically heterogeneous sheets without (upper row) and with (lower row) a structural barrier. (A) Spatial distribution of APDi. (B) Spatial distribution of APDi+1. (C) Spatial distribution of ΔAPD. (D) Voltage waveforms obtained from two different locations (marked “1” and “2”) in the sheets without a barrier. (E–H) Same as for A–D but in tissue with a structural barrier. Color scales apply to both rows. Asterisks indicate stimulus site. BCL = 280 ms.
