Insertion technique

1. Insert introducer sheath rostrally in internal jugular vein.

2. Calibrate fibreoptic catheter pre-insertion.

3. Insert catheter via introducer sheath; advance to jugular bulb.

4. Withdraw introducer sheath.

5. Confirm (i) free aspiration of blood via catheter, (ii) satisfactory light intensity reading, (iii) satisfactory positioning of catheter tip by lateral cervical X-ray (high in jugular bulb, above level of 2nd cervical vertebra).

6. Perform in vivo calibration, repeat calibration 12-hrly.

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