EUS-guided portal pressure measurement: how to make it more accurate? Authors response

We thank Zhang et al for their interest in our study and for their thoughtful comments on the accuracy of endoscopic ultrasound-guided portal vein pressure (EUS-PVP) measurements. 1 The letter raises several important methodological considerations that merit clarification.

First, regarding the observed moderate correlation (Pearson coefficient 0.72) between the compact manometer (CM) and the conventional ECG monitor with central venous pressure (CVP) module connected via a pressure transducer (CPT) for preoperative EUS-PVP measurements, we agree that this is not as strong as the excellent intraoperative correlation (0.96). However, this discrepancy may have arisen from procedural variations rather than inherent inaccuracies in the technique.

All EUS-PVP measurements were performed in the left lateral position under monitored anaesthesia care with propofol, using the long position of the EUS scope, which may increase resistance. In our study, zeroing was performed at the phlebostatic axis with the fine-needle aspiration (FNA) needle connected...