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Table 4 Lesion grade results for the clinical trial

From: Modeling esophageal protection from radiofrequency ablation via a cooling device: an analysis of the effects of ablation power and heart wall dimensions

Endoscopy results (n = 120)

Protected (n = 60)

Control (n = 60)

No lesion

56

42

Grade 1 (erythema)

0

4

Grade 2 (erosion < 5 mm)

1

1

Grade 3 (erosion(s) > 5 mm)

0

1

Grade 4a (superficial ulcer, clean)

1

4

Grade 4b (superficial ulcer with clot)

0

1

Grade 5a (deep ulcer, clean)

0

1

Grade 5b (deep ulcer with clot)

0

0

Grade 6 (fistula)

0

0