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. 2010 Sep 8;99(5):1408–1415. doi: 10.1016/j.bpj.2010.06.042

Table 1.

Number of contiguous myocytes with an EAD or DAD required to trigger a PVC in 1D, 2D, or 3D tissue

EADs
EAD/Normal Ggap = 780 nS EAD/Normal GGap = 125 nS EAD/Normal + Fibrosis GGap = 780 nS EAD/Normal + Fibrosis Ggap = 125 nS EAD/RRR Ggap = 780 nS EAD/RRR Ggap = 125 nS EAD/RRR + Fibrosis Ggap = 780 nS EAD/RRR + Fibrosis Ggap = 125 nS

1D (cable) 70 (10.5 mm) 30 (4.5 mm) 46 (6.9 mm) 20 (3.0 mm) - -
2D (ellipse) 6940 (d = 14.1) 1135 (d = 5.7) 1,668 (d = 7.8) 268 (d = 3.0) 3217 (d = 9.6) 531 (d = 3.9) 504 (d = 4.2) 112 (d = 1.8)
3D (ellipsoid) 696,910 (d = 16.5) 50,965 (d = 6.9) 229,850 (d = 11.4) 17,157 (d = 4.8) - -

DADs

DAD/Normal Ggap = 780 nS DAD/Normal Ggap = 125 nS DAD/Normal + Fibrosis Ggap = 780 nS DAD/Normal + Fibrosis Ggap = 125 nS DAD/HF Ggap = 780 nS DAD/HF Ggap = 125 nS DAD/HF +Fibrosis Ggap = 780 nS DAD/HF + Fibrosis Ggap = 125 nS

1D (cable) 80 (d = 12) 32 (d = 4.8) 22 (d = 3.3) 10 (d = 1.5) - -
2D (ellipse) 7854 (d = 15) 1256 (d = 6.3) 1668 (d = 7.8) 316 (d = 3.3) 1018 (d = 5.4) 202 (d = 2.4) 136 (d = 1.5) 40 (d = 0.9)
3D (ellipsoid) 817,280 (d = 17.4) 57,906 (d = 7.2) 50,965 (d = 6.9) 4,189 (d = 3.0) - -

EAD/Normal refers to a central region of cells that exhibit EADs surrounded by normal cells without EADs. The case is similar for the other labels, where the surrounding tissue was either normal or exhibited reduced repolarization reserve, heart failure changes (HF), or fibrosis. Gap junction conductance (Ggap) is also indicated for each case. Numbers in parentheses refer to the size (d) of the central region (in millimeters along the major axis) with cells that exhibit EADs or DADs.