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Objective: To determine the effects of varying positive end-expiratory pressures (PEEPs) on right ventricular function, hemodynamics, oxygenation, and the incidence of acute cor pulmonale (ACP) in patients with moderate-to-severe acute respiratory distress syndrome (ARDS). Methods: This prospective paired-design study involved patients with moderate-to-severe ARDS in the ICU. Participants received lung-protective ventilation and hemodynamic monitoring. During the study, mechanical ventilation was administered with PEEPs of 5 cmH2O, 10 cmH2O, and 15 cmH2O, while maintaining an end-inspiratory plateau pressure ≤ 30 cmH2O. Various assessments, including transthoracic echocardiography, cardiac output measurement, and blood gas analysis, were conducted at baseline and after 1 h of ventilation at each PEEP. Subsequently, variations in ventilation oxygenation, echocardiographic parameters, and hemodynamic indicators under different PEEPs were analyzed to explore the potential effects of PEEP on right ventricular function and hemodynamics, as well as the incidence of ACP. Results: A total of 317 ARDS patients were screened. Among them, 104 met the diagnostic criteria for moderate-to-severe ARDS, and 52 completed the study. The baseline PEEP of these 52 participants, acquired before commencement, was 11.5 ± 1.7 cmH2O, and the incidence of ACP was 25.0% (13/52). Intensive care unit mortality, overall hospital mortality, and 28-day mortality rates were 19.2% (10/52), 21.2% (11/52), and 32.7% (17/52), respectively. During the study, ACP incidences at PEEPs of 5 cmH2O, 10 cmH2O, and 15 cmH2O were 17.3% (9/52), 21.2% (11/52), and 38.5% (20/52), respectively. Meanwhile, the PaO2/FiO2 ratio improved with increasing PEEP, reaching 162.0 (140.9, 174.0), 171.0 (144.0, 182.0), and 176.5 (151.0, 196) mmHg at PEEPs of 5 cmH2O, 10 cmH2O, and 15 cmH2O, respectively. In addition, higher PEEPs were associated with a slight increase in PaCO2, showing statistically significant differences compared to moderate and low PEEPs. Compared to a PEEP of 5 cmH2O or 10 cmH2O, right ventricular function exhibited substantial changes at 15 cmH2O PEEP, manifested as increased pulmonary artery systolic pressure, enlarged right ventricular end-diastolic area, and decreased tricuspid annular plane systolic excursion, all with significant differences. Conversely, variations in left ventricular end-diastolic area and ejection fraction were not statistically significant. In terms of hemodynamics, increasing PEEP resulted in a decline in cardiac index (CI), with statistically significant differences between different PEEPs. Specifically, compared to the value at a PEEP of 5 cmH2O, the CI at a PEEP of 15 cmH2O decreased by 14.3% (2.63 [2.20, 2.95] vs. 3.07 [2.69, 3.67], p < 0.001). The decline in the stroke volume index with PEEP was more obvious (22.1 [18.4, 27.1] vs. 27.0 [24.2, 33.0], p < 0.001), reaching 18.1%. Additionally, both end-diastolic volume index and extravascular lung water index decreased significantly with increasing PEEP, while the pulmonary vascular permeability index remained unaffected. Conclusion: Different PEEPs can affect the incidence of ACP in patients with moderate-to-severe ARDS. High PEEP improves oxygenation and reduces extravascular lung water without significantly affecting the pulmonary vascular permeability index and left ventricular systolic function. Nevertheless, it can cause right ventricular dilation, as well as substantial declines in right ventricular systolic function and CI, thereby causing ACP.
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Objective:To investigate the clinical characteristics of the severe trauma patients with Acute kidney injury (AKI) ,and analyze the risk factors and clinical prognosis.Methods:Clinical data of severe trauma patients admitted to ICU of Xiaolan Hospital of Southern Medical University, from July 2018 to December 2020 were retrospectively analyzed. Demographic data, basic diseases, critical disease score, serum creatinine, hemoglobin, treatment options, blood transfusion volume, and clinical outcomes were collected to establish a clinical database. AKI was diagnosed and graded according to the Kidney Disease Improving Global Outcomes (KDIGO) criterion, and trauma type was classified according to the main injury part. The clinical data and laboratory examination of different groups were compared to analyze the clinical characteristics and prognosis in severe trauma patients. The risk factors of AKI in severe trauma patients were analyzed by Logistic regression.Results:(1) A total of 175 patients with severe trauma were eligible for inclusion, and the incidence of AKI was 30.9%(54/175), including 29 patients with AKI stage 1(16.6%), 15 patients with AKI stage 2 (8.6%), and 10 patients with AKI stage 3 (5.7%). In the cohort, the rate of in-hospital renal replacement therapy was 4%, in-hospital mortality was 5.7%, and 28-day mortality was 16.6%. (2) The age, shock patients, ICU admission serum creatinine, APACHEⅡscore and ISS score of AKI group were significantly higher than those of non-AKI group ( P<0.05). There were no significant differences between the two groups in gender, underlying diseases (hypertension and diabetes), ICU admission hemoglobin level and contrast agent utilization rate( P>0.05). Compared with the non-AKI group, AKI group had higher rates of surgical treatment (63% vs. 44.6%), more blood transfusion [875(720,1110)mL & 670(610,750)mL], longer ICU stay [6(4,11)d & 4(2.5,7.5)d], and higher rates of mechanical ventilation (96.3% vs. 81%), renal replacement therapy rate (13% vs. 0), in-hospital mortality (13% vs. 2.5%) and 28-day mortality (25.9% vs. 12.4%), the differences were statistically significant ( P<0.05). (3) The incidence of AKI was different in patients with different types of severe trauma, and the abdominal trauma group with a highest rate (50%). The serum creatinine at ICU admission and the peak value during hospitalization in abdominal trauma group were significantly higher than those in other injury types ( P<0.05). (4) Logistic regression analysis showed Age [ OR=1.020, 95% CI(1.003,1.038), P=0.024], APACHEⅡscore [ OR=1.137, 95% CI(1.053,1.228), P=0.001], shock [ OR=1.102, 95% CI(0.906,1.208), P=0.034], ICU admission serum creatinine [ OR=1.068, 95% CI(1.036,1.102), P=0.000], surgical treatment [ OR=4.205, 95% CI(1.446,12.233), P=0.008], blood transfusion volume [ OR=1.006, 95% CI(1.002,1.009), P=0.001] were independent risk factors for AKI in severe trauma patients. Conclusions:Severe trauma patients yield a high incidence of AKI influencing clinical prognosis. The incidence of AKI varies with different types of severe trauma. Age, APACHEⅡscore, shock, ICU admission serum creatinine, surgical treatment, and blood transfusion volume are independent risk factors for AKI in severe trauma patients.
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Objective:To investigate the clinical value of neuron specific enolase (NSE) and bispectral index (BIS ) in predicting the neurological prognosis in patients with severe intracerebral hemorrhage.Methods:Patients with severe intracerebral hemorrhage admitted to the ICU of Xiaolan Hospital of Southern Medical University from January 2019 to December 2020 were selected, and serum NSE detection and BIS monitoring were performed at an early stage. According to the Glasgow outcome scale (GOS) at 90 days after intracerebral hemorrhage, the patients were divided into the good neurologic prognosis group (GOS 4-5) and poor neurologic prognosis group (GOS 1-3). The levels of NSE and BIS between the two groups were compared. Receiver operating characteristic (ROC) curve and area under the curve (AUC) were used to evaluate the predictive value of NSE, BIS and their combination in predicting neurological prognosis.Results:A total of 126 patients with severe intracerebral hemorrhage were enrolled in this study, and 32 patients (25.4%) had poor neurological prognosis. The level of NSC in the poor neurological prognosis group was significantly higher than that in the good neurologic prognosis group [28 (13.7, 50.4) ng/mL vs. 13.5 (9.6, 18.5) ng/mL, P < 0.05], while the BIS level was significantly lower than that in the good neurologic prognosis group [32 (25.2, 45) vs. 55 (48, 62.2), P <0.05]. For detection of poor neurologic outcome in patients with severe intracerebral hemorrhage, NSE and BIS yielded the AUC values of 0.768 (0.685, 0.839) and 0.866 (0.793, 0.920), respectively, with cut-off values of 21.7 ng/mL and 47, respectively. The combination of NSE and BIS yielded a remarkably higher AUC value of 0.927 (0.867, 0.966) for predicting poor neurologic outcome than each index alone ( P<0.05). Conclusions:Early monitoring of NSE and BIS can effectively predict the neurological prognosis of patients with severe intracerebral hemorrhage, and the combination of NSE and BIS can further improve the prediction efficiency.
