Objective To evaluate the value of central venous pressure (CVP),central venous oxygen saturation (ScvO2) and venous-arterial carbon dioxide partial pressure gradient (Pv-aCO2) in the diagnosis of septic shock-induced left ventricular dysfunction.Methods Consecutive patients with septic shock were enrolled from September 2013 to September 2014 in ICU at Peking Union Medical College Hospital.The data of CVP,Pv-aCO2 and ScvO2 were recorded and analyzed.According to the left ventricular ejection fraction (LVEF) tested by bedside echocardiography,the patients were divided into two groups:new onset of left ventricular dysfunction (LVEF ＜ 50％) group and non-left ventricular dysfunction (LVEF ≥ 50％) group.A diagnostic model was created by logistic regression.The diagnostic performance and cut-off values of CVP,Pv-aCO2,ScvO2 were determined using receiver operating characteristic (ROC) curve analysis.Results Among 93 patients enrolled,39 were diagnosed with left ventricular dysfunction.In the new onset group,CVP [(12.5±3.9) mmHg(1 mmHg=0.133 kPa) vs (10.4±2.5)mmHg;P=0.005] and Pv-aCO2 [(7.5 ± 3.9) mmHg vs (4.5 ± 2.6) mmHg;P ＜ 0.001] were significantly higher than those in the non-left ventricular dysfunction group,while ScvO2 [(62.4 ± 10.5) ％ vs (72.6 ± 9.0) ％;P ＜ 0.001] was significantly lower.As far as the diagnostic value of these three parameters were concerned for left ventricular dysfunction,the sensitivity of CVP ≥ 12.5 mmHg was 46.2％,specificity 81.5％ with an area under ROC curve (AUCROC) 0.674;the sensitivity of Pv-aCO2 ≥ 5.0 mmHg 76.9％,specificity 37.0％,AUCROC 0.738;the sensitivity of ScvO2 ≤65.8％ 64.1％,specificity 78.6％,AUCROC 0.775.When the cut-off values were determined by ROC,the diagnostic performance of the model was ≥0.377 with the sensitivity,specificity and AUCROC 82.1％,79.6％ and 0.835,respectively.Conclusion In patients with septic shock,the logistic regression model established by CVP,Pv-aCO2 and ScvO2 contributes to the diagnosis of septic shock-induced left ventricular dysfunction.

Objective To investigate the clinical role of central venous pressure(CVP) to evaluate fluid responsiveness in septic shock patients. Methods 66 septic shock patients were studied, every patient was administered a volume challenge, before and after it, CVP, intrathoracic blood volume index (ITBVI),global end-diastolic volume index(GEDVI), cardiac index(CI), stroke volume index(SVI) were measured by PiCCO method. All the obtained values were analyzed by statistics method. Results Initial CVP in responders is significantly different from that in nonresponders; △ITBVI, △GEDVI, △CI, △SVI, △HR (△:changes) before and after volume challenge in responders were significantly different from those in nonresponders; the significance of △ITBVI, AGEDVI to predict volume responsiveness was strong indicated by high values of areas under the receiver operating characteristic curves (0.674 and 0.700, respectively).If patients were regrouped by CVP≤11 mm Hg(1 mm Hg=0.133 kPa) and CVP > 11 mm Hg, initial ITBVI and GEDVI in responders were not significantly different from that in nonresponders; △ITBVI,△GEDVI, △CI, △SVI before and after volume challenge in responders were significantly different from those in nom'esponders. Conclusion In septic shock patients, CVP play a guidance role to predict and evaluate volume responsiveness and when CVP was > 11 nun Hg, a positive response will be less likely. Initial volumetric parameters(intrathoracic blood volume and global end-diastolic volume) play a questionable role in predicting and evaluating volume responsiveness, changes before and after volume challenge maybe helpful.

Objectlve To research and analyze the hemod)rnamic status of refractory septic shock associated cardiac dysfunction.Methods 70 refractory septic shock patients were studied.In the duration of pulmonary artery catheter(PAC)-directed hemodynamic optimization,the patients were divided into a cardiac dysfunction group and a control group.Hemodynamic parameters,arterial blood lactate concentration and APACHE II scores were obtained instantly after the placement of a PAC,then lactate clearance in 24 hours was surveyed and calculated.Subsequently the two groups of patients were regrouped by nonsurvivor and survivors respectively.All the obtained values were analyzed with statistic methods.Results 37% of the refractory septic shock patients was complicated with cardiac dysfunction.The age of the patients complicated with cardiac dysfunction was significantly higher than that of the patients of the control group.Central venous pressure(CVP),pulmonary artery obstruction pressure(PAOP),pulmonary artery pressure (PAP),systemic vascular resistance index(SVRI),pulmonary vascular resistance index(PVRI)and oxygen extraction ratio(O2ext)in the cardiac dysfunction group were significantly different from those in the control group.Cardiac output(CO),cardiac index(CI),oxygen delivery index(DO2I)and mixed venous oxygensaturation(S-v O2)were significantly lower than those of the patients in the control group.S -v O2 had a strong correlation witIl CI.If the patients were regrouped by nonsurvivors and survivors.in the patients complicated with cardiac dysfunction APACHE II scores were significantly higher in the nonsurvivors than survivors:the lactate clearance in 24 hours(median-25%)of the nonsurvivors was significantly lower than that of nonresponders(median 22%),P＜0.05.Conclusion (1)In refractory septic shock patients,cardiac dysfunction maybe the main reason leading to bad outcome.(2)Higher CVP and PAOP and lower S -v O2 indicate the onset of cardiac dysfunction.(3)The patients with significantly high initial arterial blood lactate level and the low lactate clearance in 24 hours had bad outcome.

Objective To investigate the effect of the bedside lung ultrasound in emergency (BLUE)-plus lung ultrasound protocol on lung consolidation and atelectasis of critical patients.Methods All patients who need to receive mechanical ventilation for more than 48 hours in ICU from June 2010 to December 2011 in Peking Union Medical College Hospital were included in the study.BLUE-plus and BLUE lung ultrasound,bedside X-ray,lung CT examination were performed on all patients at the same time.The condition of lung consolidation and atelectasis discovered by BLUE-plus lung ultrasound protocol was recorded and compared with bedside X-ray or lung CT.The difference in assessment of lung consolidation and atelectasis between BLUE-plus lung ultrasound protocol and BLUE protocol was compared.Results A total of 78 patients were finally enrolled in the study.The lung CT found 70 cases (89.74％) had different degrees of lung consolidation and atelectasis.The sensitivity,specificity and diagnostic accuracy of lung consolidation and atelectasis by the bedside chest X-ray were 31.29％,75.00％ and 38.46％,respectively.BLUE-plus lung ultrasound protocol found 68 cases with lung consolidation and atelectasis,and its sensitivity,specificity,and diagnostic accuracy were 95.71％,87.50％ and 94.87％,respectively,which were significantly higher than those of lung CT.BLUE protocol found 48 cases of lung consolidation and atelectasis,and its sensitivity,specificity,and diagnostic accuracy were 65.71％,75.00％ and 66.67％,respectively.The position of lung consolidation and atelectasis which hadn't been found by BLUE protocol was mainly proved to be located in the basement of lung by lung CT.Conclusions The incidence of lung consolidation and atelectasis in critical patients who received mechanical ventilation is high.The BLUE-plus lung ultrasound protocol has a relatively higher sensitivity,specificity and diagnostic accuracy for consolidation and atelectasis,which can find majority of consolidation and atelectasis.As BLUE-plus lung ultrasound is a bedside noninvasive method allowing immediate assessment of most lung consolidation and atelectasis,it will be likely the alternative of the CT and play a key role in assessment of lung consolidation and atelectasis.

Objective To investigate the application and effect evaluation of combined warming and humidification device in patients with artificial airway in high altitude area. Methods The convenient sampling method was used to select 225 hospitalized patients in the Department of Critical Care Medicine of the People′s Hospital of Tibet Autonomous Region from January to June 2018. According to the order of admission time, they were divided into two groups: observation group (125 cases) and control group (100 cases). The observation group was humidified by artificial nose, while the control group was humidified by heating and humidifying device. The phlegm properties and scab formation were observed in the two groups. The ambient temperature, humidity and airway temperature were measured at 3:00, 9:00, 15:00 and 21:00 every day. The average values of four measurements were taken. The levels of CO2 partial pressure and oxygen partial pressure were recorded by blood gas analysis. χ2was used to compare the differences between the 2 groups. Results There was no difference in sputum properties between the two groups before humidification. The incidence of grade II and grade III mucous phlegm in the observation group was 46, 48 and 65 on the first, second and third day after humidification, while that in the control group was 13, 9 and 10 respectively. The difference between the two groups was statistically significant (χ2=16.266, 25.387, 44.100, P<0.01). On the 2nd and 3rd day, the oxygen partial pressure levels of the observation group were (92.62 ± 5.73), (91.34 ± 4.82) mmHg, and those of the control group were (96.17 ± 3.60), (95.53 ± 2.96) mmHg, respectively. The difference between the two groups was statistically significant (t=5.697, 8.045, P<0.01). The sputum scab formation and airway temperature in the observation group were 41 cases and(29.89±1.95)℃ respectively after 3 days of humidification, 7 cases and(34.79±1.82)℃respectively in the control group. The difference between the two groups was statistically significant (χ2= 22.035, t =- 26.031, P < 0.01). Conclusion The combination of heating and humidifying device can effectively improve the sputum properties, reduce the formation of sputum scab, effectively improve the level of carbon dioxide, without increasing the workload.

Catheter related blood stream infection (CRBSI), a common complication in the department of critical care medicine, may result in longer stay in the department of critical care medicine, increased hospitalization costs, even sepsis that leads to increased mortality in severe patients. The infection control of CRBSI has become the focus of the department of critical care medicine and even hospital management as well as the core of quality control. At present, the prevention program of CRBSI in the department of critical care medicine has been basically in place, and the national standards for infection prevention during central venous catheter placement and maintenance have been established. The establishment and implementation of these norms can effectively reduce the incidence of CRBSI, but CRBSI in the department of critical care medicine is still common and serious, indicating that there are defects in the aseptic operation during central vein catheterization and use. The corre- sponding operation process should be investigated and improved, and efforts should be made from the aspects of theory, management, education, norms, and supervision to avoid or reduce the occurrence of CRBSI and even achieve zero infection by improving and implementing various sensory control requirements in clinical operation.

To establish the experts consensus on the management of delirium in critically ill patients.A special committee was set up by 15 experts from the Chinese Critical Hypothermia-Sedation Therapy Study Group.Each statement was assessed based on the GRADE (Grading of Recommendations Assessment,Development,and Evaluation) principle.Then the Delphi method was adopted by 36 experts to reassess all the statements.(1) Delirium is not only a mental change,but also a clinical syndrome with multiple pathophysiological changes.(2) Delirium is a form of disturbance of consciousness and a manifestation of abnormal brain function.(3) Pain is a common cause of delirium in critically ill patients.Analgesia can reduce the occurrence and development of delirium.(4) Anxiety or depression are important factors for delirium in critically ill patients.(5) The correlation between sedative and analgesic drugs and delirium is uncertain.(6) Pay attention to the relationship between delirium and withdrawal reactions.(7) Pay attention to the relationship between delirium and drug dependence/ withdrawal reactions.(8) Sleep disruption can induce delirium.(9) We should be vigilant against potential risk factors for persistent or recurrent delirium.(10) Critically illness related delirium can affect the diagnosis and treatment of primary diseases,and can also be alleviated with the improvement of primary diseases.(11) Acute change of consciousness and attention deficit are necessary for delirium diagnosis.(12) The combined assessment of confusion assessment method for the intensive care unit and intensive care delirium screening checklist can improve the sensitivity of delirium,especially subclinical delirium.(13) Early identification and intervention of subclinical delirium can reduce its risk of clinical delirium.(14) Daily assessment is helpful for early detection of delirium.(15) Hopoactive delirium and mixed delirium are common and should be emphasized.(16) Delirium may be accompanied by changes in electroencephalogram.Bedside electroencephalogram monitoring should be used in the ICU if conditions warrant.(17) Pay attention to differential diagnosis of delirium and dementia/depression.(18) Pay attention to the role of rapid delirium screening method in delirium management.(19) Assessment of the severity of delirium is an essential part of the diagnosis of delirium.(20) The key to the management of delirium is etiological treatment.(21) Improving environmental factors and making patient comfort can help reduce delirium.(22) Early exercise can reduce the incidence of delirium and shorten the duration of delirium.(23) Communication with patients should be emphasized and strengthened.Family members participation can help reduce the incidence of delirium and promote the recovery of delirium.(24) Pay attention to the role of sleep management in the prevention and treatment of delirium.(25) Dexmedetomidine can shorten the duration of hyperactive delirium or prevent delirium.(26) When using antipsychotics to treat delirium,we should be alert to its effect on the heart rhythm.(27) Delirium management should pay attention to brain functional exercise.(28) Compared with non-critically illness related delirium,the relief of critically illness related delirium will not accomplished at one stroke.(29) Multiple management strategies such as ABCDEF,eCASH and ESCAPE are helpful to prevent and treat delirium and improve the prognosis of critically ill patients.(30) Shortening the duration of delirium can reduce the occurrence of long-term cognitive impairment.(31) Multidisciplinary cooperation and continuous quality improvement can improve delirium management.Consensus can promote delirium management in critically ill patients,optimize analgesia and sedation therapy,and even affect prognosis.

The department of critical care medicine has a high prevalence of hospital acquired infections, which are closely associated with prognosis of critically ill patients. With hospital acquired infections as the axis, the treatment of critically ill patients can be divided into three phases: management of the primary disease and support of organ function, treatment of various complications resulting from the primary disease, and control of further damage and new complications. The cycle of the last two phases may put the patient in a state of Persistent inflammation, Immunosuppression, and Catabolism Syndrome (PICS), which ultimately leads to a poor prognosis. Fine control of the above three stages to reduce the risk of hospital acquired infections is a non-negligible component of the critical care process. Therefore, how to understand, prevent and treat hospital acquired infections is a top priority in the current development of critical care medicine. This review provides a comprehensive overview of strategies for the prevention and management of hospital acquired infections in critical care, covering five areas: changing the perception of hospital acquired infections, standardizing specific prevention interventions, consolidating the theoretical basis, recognizing that hospital acquired infection prevention are treatments, and integrating treatment to quality assurance. The aim is to develop the concept of severe treatment based on the prevention and control of severe patients, reduce the risk of hospital acquired infections of severe patients and improve the quality of critical care.

Critically ill patients are at high risk for hospital acquired infections, which can significantly increase the mortality rate and treatment costs for these patients. Therefore, in the process of treating the primary disease, strict prevention and control of new hospital infections is an essential component of the treatment for critically ill patients. The treatment of critically ill patients involves multiple steps and requires a concerted effort from various aspects such as theory, management, education, standards, and supervision to achieve effective prevention and control of hospital infections. However, there is currently a lack of unified understanding and standards for hospital infection prevention and control. To address this, in March 2024, a group of experts in critical care medicine, infectious diseases, and hospital infection from China discussed the current situation and issues of hospital infection control in the intensive care unit together. Based on a review of the latest evidence-based medical evidence from both domestic and international sources, 2024 Expert Consensus on Hospital Acquired Infection Control Principles in the Department of Critical Care Medicine was formed, aiming to provide a basis for the development of hospital infection prevention and control strategies in the field of critical care medicine.