Author: Marcela Rodriguez Jimenez
Date of first publication: 06.02.2024
Last change: 04.04.2024
Removal of linked article on assessing recruitability  no new revisionThe authors' point? The normalized maximum distance on a quasistatic PV curve and the recruitmenttoinflation ratio can be used at the bedside as potential indicators of lung recruitability.
In mechanically ventilated COVID19 patients, what is the relationship between lung recruitability assessments based on the lowflow quasistatic pressurevolume (PV) curve and the recruitmenttoinflation (R/I) ratio?
Inclusion criteria  Exclusion criteria 
Aged 18 years or older  Under 18 years of age 
Diagnosis of COVID19 confirmed by polymerase chain reaction or quantitative antigen testing of nasal swabs  No recording of respiratory data by Datalogger 5.00 
Simultaneous evaluation of the quasistatic PV curve and the R/I ratio using Datalogger 5.00  
Interventions  
Quasistatic PV curve  R/I ratio (Recruitmenttoinflation ratio)  Recruitability assessment 



Measurements and main results  
Enrollment and baseline characteristics  Correlation between NMD and R/I ratio  Relationship between compliance and recruitability items 



There is a strong correlation between NMD of the quasistatic PV curve and the R/I ratio for recruitability assessment. In addition, NMD and the R/I ratio correlate with the Crs ratio (higher/lower). Therefore, NMD and the R/I ratio could be potential indicators of recruitability that can be performed at the bedside.
Hamilton Medical offers an extensive range of educational material on use of the P/V Tool for assessing recruitability, performing recruitment maneuvers, and setting PEEP. Follow the link below to access articles, videos, elearning modules, and more.
We bring you the key findings from key papers.
Get the lowdown on milestones in medical research. Read the key facts and findings from watershed papers in an easy‑to‑digest format.