TABLE 1.

ECG scoring systems (A–G) criteria.

Scoring system A
0	0–49 PVCs
1	50–499 PVCs
2	>499 PVCs and/or 1 episode of SVT or VF
3	>1 episode of VT or VF or both (<60-s combined duration)
4	VT or VF or both (60–119-s total combined duration)
5	VT or VF or both (>119-s total combined duration)
6	Fatal VF starting at >15 min after occlusion
7	Fatal VF starting between 4 and 14 min 59 s after occlusion
8	Fatal VF starting between 1 min and 3 min 59 s after occlusion
9	Fatal VF starting < 1 min after occlusion
Scoring system B
0	<10 PVCs
1	>10 PVCs
2	1–5 episodes of VT
3	>5 episodes VT and/or any number episodes SVF and/or 1 episode of NVF (provided VT and VF total duration is <40 s)
4	2–5 episodes NVF provided VT and VF total duration <80 s
5	>5 episodes of NVF provided VT and VF total combined duration <160 s
6	VT or VF or both (total combined duration <300 s)
7	VT or VF or both (total combined duration >300 s)
Scoring system C
0	No PVCs, VT, or VF
1	PVCs
2	1–5 episodes of VT
3	>5 episodes of VT or 1 episode of VF or both
4	2–5 episodes of VF
5	>5 episodes of NVF
Scoring system D
0	<10 PVCs
1	10–50 PVCs or 1 episode of VT or both
2	>50 PVCs or >1 episode of VT or both
3	SVF or 1 episode of NVF
4	2–4 episodes of NVF
5	>4 episodes of NVF
Scoring system E
0	<20 PVCs
1	21–100 PVCs
2	>100 PVCs or 1–3 episodes of VT or both
3	>3 episodes of VT
4	SVF
5	1 or 2 episodes of NVF
6	3–5 episodes of NVF
7	>5 episodes of NVF
Scoring system F
0	<50 PVCs
1	Q50 PVCs
2	1–5 episodes of VT
3	Q6 episodes of VT
4	SVF or 1 episode of NVF or both
5	2–5 episodes of NVF
6	>5 episodes of NVF
Scoring system G
Score	(log10 PVCs) + (log10 episodes VT) + 2[(log10 episodes of VF) + (log10 total duration of VF)]

Scoring system criterion modified from Curtis and Walker (9).

NVF, nonspontaneous converting VF.