Fig. 4
From: An easier and safe affair, pleural drainage with ultrasound in critical patient: a technical note
A Using the high-frequency US transducer (linear probe) in the transverse position, the puncture is performed employing short axis ultrasound-guidance (out of plane technique) at the point previously identified. Aspiration of fluid with a syringe confirms correct position of the needle tip. B With direct needle guidance, the correct position of the needle tip is visualised in real-time and is monitored constantly