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Table 1 The grading criteria of saphenous vein punctures

From: A randomized controlled trial of ultrasound-assisted technique versus conventional puncture method for saphenous venous cannulations in children with congenital heart disease

I Visible bilateral saphenous veins, no difficulty in puncture

II Only a saphenous vein visible, predictable difficult access

III No visible or palpable bilateral saphenous veins

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BMC Anesthesiology

ISSN: 1471-2253

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