Impact of cardiac output and alveolar ventilation in estimating ventilation/perfusion mismatch in ARDS using electrical impedance tomography.

ABSTRACT:

Introduction

Electrical impedance tomography (EIT) can be used to assess ventilation/perfusion (V/Q) mismatch within the lungs. Several methods have been proposed, some of them neglecting the absolute value of alveolar ventilation (V_A) and cardiac output (Q_C). Whether this omission results in acceptable bias is unknown.

Methods

Pixel-level V/Q maps of 25 ARDS patients were computed once considering (absolute V/Q map) and once neglecting (relative V/Q map) the value of Q_C and V_A. Previously published indices of V/Q mismatch were computed using absolute V/Q maps and relative V/Q maps. Indices computed with relative V/Q maps were compared to their counterparts computed using absolute V/Q maps.

Results

Among 21 patients with rat

SUBMITTER: Tuffet S 

PROVIDER: S-EPMC10165791 | biostudies-literature | 2023 May

REPOSITORIES: biostudies-literature