Review Article
Flushing and Locking of Venous Catheters: Available Evidence and Evidence Deficit
Table 4
Calculation of recommended locking volumes if lock does not cause adverse effects when systemically injected.
| Catheter type | Total lock volume in mL | Minimum catheter volume in mL (Approximately internal volume + 20% spillage) | Extra volumea |
| Peripheral catheters | 1.0 | 0.04 (0.03 + 0.006) | 0.9 | Midline | 1.5 | 0.5 (0.4 + 0.1) | 1.0 | PICC | 1.5 | 0.7 (0.6 + 0.1) | 0.8 | Nontunnelled CVC | 1.5 | 0.7 (0.6 + 0.1) | 0.8 | Small bore tunnelled catheter (≤1 mm ID) | 1.5 | 0.8 (0.7 + 0.1) | 0.7 | Large bore tunnelled catheter (>1 mm ID) | 2.5 | 1.6 (1.3 + 0.3) | 0.9 | TIVADs (reservoir volume up to 0.6 mL) | 2.5 | 1.6 (1.3 + 0.3) | 0.9 |
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Volume might be used for add-ons, Huber needle, extension set extra-long catheters, or surplus for the positive pressure technique.
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