Water manometer for pleural pressure measurement: 22G needle interposed

An illustration of the interposed 22-gauge (G) needle for the water manometer. Both IV tubes must be carefully purged of air prior to acquiring pleural pressures.

Reproduced with permission from the American College of Chest Physicians. Doelken P, Huggins JT, Pastis NJ, Sahn SA. Pleural manometry: technique and clinical implications. Chest 2004; 126:1764. Copyright © 2004.

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