Abstract: | ObjectiveTo reveal the changes of alveolar microcirculation in mechanical ventilation with high PEEP and the influence of fluid resuscitation on alveolar microcirculation.
MethodsThis study was carried in 15 healthy, adult mongrel dogs in Beijing, to observe the breathing, systemic circulation and alveolar microcirculation respectively in baseline(PEEP 5 cmH2O), high PEEP (MAP dropped more than 20 mmHg, before resuscitation) and high PEEP after fluid resuscitation. The alveolar microcirculation was observed by the SDF(sidestream dark-field, SDF), record videos and then analyzed by software of AVA3.2 off-line, comparisons of experimental data in different conditions was used the Wilcoxon test.
ResultsCVP elevated and CO dropped in mechanical ventilation with high PEEP, total vascular density (TVDa, P=0.036), perfused vessel density (PVDa, P=0.002), proportion of perfused vessels (PPVa, P=0.003) and microvascular flow index (MFIa, P=0.002) of alveolar microcirculation were significant reduced, the capillary density surrounding the alveolar decline was not obvious(TVDs, P=0.319). The alveolar microcirculation is not improved after the fluid resuscitation.
ConclusionAlveolar microcirculation is significantly worsed in mechanical ventilation with high PEEP and fluid resuscitation can not improve the alveolar microcirculation disorders. |