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Table 1 Occluder size select for OPOTTMIS.

From: Off-pump occlusion of trans-thoracic minimal invasive surgery (OPOTTMIS) on simple congenital heart diseases (ASD, VSD and PDA) attached consecutive 210 cases report: A single institute experience

Disease The experienced formulation
ASD Y = X + 4 ~ 6 (mm)
VSD Y = X + 4 ~ 6 (mm)
PDA Y = X + 2 ~ 4 (mm)
  1. Y: size of Occluder; X: max diameter of defect tested by UCG.