is there an optimal positive end-expiratory pressure to measure the internal jugular vein collapsibility index? a pilot study in mechanically ventilated patients

Background: hemodynamic monitoring its early stabilization is very important in critically ill patients. evaluating the internal jugular vein diameter during respiratory cycles by the means of point-of care ultrasound provides an important, easily available and precise index for monitoring hemodynamic status; a new method which is called internal jugular vein collapsibility index (ijv-ci). any events that alters intrathoracic volumes and pressures may affect this index. in this study we investigate the effects of various levels of positive end-expiratory pressure on this index. methods: thirty mechanically ventilated patients were studied. we used three different peep levels (0, 5 and 10 cmh2o) and point-of-care ultrasound evaluation of ijv (internal jugular vein) diameter to determine the ijv-ci. the analysis were performed using spss v.25.0. results: patients were included men (76.6%) and women (33.3%). the mean age of patients was 39.65±3.4 for men and 42.71± 9.34 for women. the ijv-ci were 20.71±11.77 and 24.25±11.46 in peep=0 and peep=10 cmh20 groups respectively. in 5cmh20-peep group median and interquartile range were 16.45(14.8). the ijv-ci in three different peep levels were not statistically significantly different. conclusion: according to the finding of this study, we found no evidence of an optimal peep level to measure the ijv-ci.