OBJECTIVE: To analyze the clinical characteristics, microbiological analysis, and drug resistance patterns of intensive care unit (ICU) bloodstream infection. METHODS: A prospective cohort study method was employed to collect clinical data from patients suspected of bloodstream infection (BSI) during their stay in ICUs across 67 hospitals in 16 provinces and cities nationwide, from July 1, 2021, to December 31, 2022. Electronic data collection technology was used to gather general information on ICU patients, including gender, age, length of hospital stay, as well as diagnostic results, laboratory tests, imaging studies, microbiological results (including smear, culture results, and pathogen high-throughput testing), and prognosis. Patients were divided into a BSI group and a non-BSI group based on the presence or absence of BSI; further, patients with BSI were categorized into a drug-resistant group and a non-drug-resistant group based on the presence or absence of drug resistance. Differences in the aforementioned indicators between groups were analyzed and compared; variables with P < 0.10 in the univariate analysis were included in a multivariate Logistic regression analysis to identify risk factors for mortality and drug resistance in ICU patients with BSI. RESULTS: A total of 2 962 ICU patients suspected of BSI participated in the study, including 790 in the BSI group and 2 172 in the non-BSI group. Patients in the BSI group were mainly from East China and Southwest China, with significantly higher age and mortality rates than those in the non-BSI group. Among ICU patients with BSI, Staphylococcus had the highest detection rate (8.10%), followed by Klebsiella pneumoniae (7.47%); there were 169 cases in the drug-resistant group and 621 cases in the non-drug-resistant group; 666 cases survived, and 124 cases died (mortality was 15.70%). There were statistically significant differences between the death group and the survival group in terms of age, regional distribution, and bloodstream infections caused by Gram negative (G^-) bacilli, Enterococcus faecium, Aspergillus, and Klebsiella pneumoniae; multivariate Logistic regression analysis showed that age [odds ratio (OR) = 1.01, 95% confidence interval (95%CI) was 1.00-1.03], regional distribution (OR = 4.07, 95%CI was 1.02-1.34), Enterococcus faecium infection (OR = 3.64, 95%CI was 1.16-11.45), and Klebsiella pneumoniae infection (OR = 2.64,95%CI was 1.45-4.80) were independent risk factors for death in ICU patients with BSI (all P < 0.05). There were statistically significant differences between the drug-resistant group and the non-drug-resistant group in terms of age and bloodstream infections caused by Gram positive (G⁺) cocci and G^- bacilli; multivariate Logistic regression analysis showed that age (OR = 1.01,95%CI was 1.00-1.03), G^- bacilli infection (OR = 2.18, 95%CI was 1.33-3.59), Escherichia coli infection (OR = 0.28,95%CI was 0.09-0.84), and Enterococcus faecium infection (OR = 3.35, 95%CI was 1.06-10.58) were independent risk factors for drug resistance in ICU patients with BSI (all P < 0.05). CONCLUSIONS Bloodstream infections may increase the mortality of ICU patients. Older age, regional distribution, Enterococcus faecium infection and Klebsiella pneumoniae infection can increase the mortality rate of ICU patients with BSI; bloodstream infections caused by G^- bacilli are prone to drug resistance, but have no significant impact on the mortality of ICU patients with BSI.
Adult ; Humans ; Bacteremia/microbiology* ; China/epidemiology* ; Cohort Studies ; Cross Infection/microbiology* ; Drug Resistance, Bacterial ; Intensive Care Units/statistics & numerical data* ; Prospective Studies ; Risk Factors ; Sepsis/microbiology*

OBJECTIVETo understand epidemiological characteristics of Haemophilus influenzae (Hi) infection in hospitalized children with lower respiratory tract infection (LRTI) in west Sichuan China.

METHODThe multicenter prospective cross-sectional design was used; four hospitals in west Sichuan China were chosen as research field, sputum bacterial culture was done and biological typing, PCR identification and drug sensitivity test of Hi epidemic strains were carried out among 0-17y hospitalized patients with LRTI in four hospitals located in west Sichuan China.

RESULTTotally 5 748 cases with LRTI in four hospitals were investigated in west Sichuan from Nov. 2013 to April 2014 and the rate of sputum culture was 46.96% (2,699/5 748). The total pathogenic bacteria positive rate of sputum culture was 43.53% (1,175/2 699), and 279 Haemophilus influenzae (Hi) strain in 272 cases were isolated, the Hi positive rate was 10.08% (272/2 699). All the strains (100%) were non-typeable Haemophilus influenzae (NTHi ) indentified by PCR. The main biotype of 279 strains was type Ⅰ with 39.07% (109/279) and type Ⅳ with 50.90% (142/279) ; 272 cases were enrolled in this survey, 12.50% (34/272) had broncheolitis, the rest of lower respiratory infection was 87.50 % (238/272), and 2.57% (7/272) was neonatal pneumonia, 2.21%(6/272)was pneumonia complicated with sepsis; in four hospitals the overall positive rate of Hi in inpatients with lower respiratory infection was 10.21%, 28.96%, 4.80%, 10.21% (χ(2) = 112.561, P = 0.000) and the positive rate of Hi inpatients with broncheolitis was 11.92%, 20.93%, 4.76%, and 66.67% (Fisher exact probability P = 0.001), with the rest lower respiratory infection was 9.96%, 30.90%, 4.81%, 9.85% (χ(2) =108.876, P = 0.000); 2.87% (8/279) bacterial strains of β-lactamase-nonproducing-ampicillin-intermediary (BLNAI) distributed in four hospitals, and 1.79% (5/279) bacterial strains of β-lactamase-nonproducing-ampicillin-resistant (BLNAR), 0.72% (2/279) bacterial strains of β-lactamase-positive amoxicillin-clavulanate-resistance (BLPACR) were found in two hospitals respectively.

CONCLUSIONAll the Hi isolated from sputum were non-typeable among 0-17y inpatients with LRTI and the main biotype were type Ⅰ and type Ⅳ in west Sichuan China. Much attention should be paid to BLNAR and BLPACR strains found in the west Sichuan region.

Ampicillin ; Child ; Child, Hospitalized ; China ; epidemiology ; Cross-Sectional Studies ; Drug Resistance, Bacterial ; Epidemiologic Studies ; Haemophilus Infections ; epidemiology ; Haemophilus influenzae ; Humans ; Microbial Sensitivity Tests ; Pneumonia, Bacterial ; epidemiology ; Polymerase Chain Reaction ; Prospective Studies ; Respiratory Tract Infections ; epidemiology ; microbiology ; Sepsis ; epidemiology ; beta-Lactamases

Neonatal sepsis remains one of the most important causes of death and co-morbidity in very-low-birth-weight (VLBW) infants. The aim of this study was to determine the current incidences of early-onset sepsis (EOS) and late-onset sepsis (LOS), the distribution of pathogens, and the impact of infection on co-morbidities in VLBW infants. We analyzed the data including sepsis episode from 2,386 VLBW infants enrolled in Korean Neonatal Network from January 2013 to June 2014. We defined EOS as a positive blood culture occurring between birth and 7 days of life and LOS after 7 days of life. Sepsis was found in 21.1% of VLBW infants. The risk of sepsis was inversely related to birth weight and gestational age. EOS was found in only 3.6% of VLBW infants, however the mortality rate was as high as 34.1%. EOS was associated with the increased odds for bronchopulmonary dysplasia and intraventricular hemorrhage. The vast majority of EOS was caused by Gram-positive organisms, particularly coagulase-negative staphylococci (30.6%). LOS developed in 19.4% of VLBW infants with a 16.1% mortality rate. Pathogens in LOS were dominated by coagulase-negative staphylococci (38.3%). Twenty-five percent and fifty percent of first LOS episode occurred after 12 days and 20 days from birth, respectively. Younger and smaller VLBW infants showed the earlier occurrence day for the 25% of first LOS episode. This study provides a recent nationwide epidemiology of sepsis in VLBW infants in Korea. Based on this study, successful strategies to reduce infections would improve survival and reduce morbidity.
Coagulase/metabolism ; Databases, Factual ; Gestational Age ; Gram-Negative Bacteria/isolation & purification ; Gram-Positive Bacteria/isolation & purification ; Humans ; Incidence ; Infant, Newborn ; *Infant, Very Low Birth Weight ; Kaplan-Meier Estimate ; Republic of Korea/epidemiology ; Risk Factors ; Sepsis/*epidemiology/microbiology/mortality ; Staphylococcus/enzymology/isolation & purification

OBJECTIVETo investigate the incidence of nosocomial infections of extremely premature infants and to explore the risk factors and strategies for infection control.

METHODThere were 118 extremely premature infants who were confirmed to have nosocomial infection in neonatal intensive care unit of the authors' hospital from January 2008 to December 2012. Their data of the infection rate, risk factors and clinical characteristics were retrospectively analyzed.

RESULTDuring the study, nosocomial infection occurred in 78 extremely premature infants 129 times. The nosocomial infection rate was 66.10%. The rate of ventilator-associated pneumonia (VAP) was 1.43% (35/2 452). The catheter related blood stream infection (CRBSI) rate was 0.35% (16/4 613). There were 74 (57.36%) cases of pneumonia, which was the most common nosocomial infection of extremely premature infants. There were 35 cases of VAP, which accounted for 47.30% of pneumonia. The next was sepsis, 48 cases. Seventy-four (74/90, 82.22%) strains of isolates were Gram-negative bacteria, which accounted for the highest proportion, followed by Gram-positive (12 strains), fungus (4 strains); Klebsiella pneumonia is the most common pathogens of nosocomial infection in extremely premature infants. The isolation rates of Klebsiella pneumonia with positive extended-spectrum beta-lactamases (ESBL) were 90.91% (20/22) , universally resistant to cephalosporins. Single-factor analysis showed that the body weight, mechanical ventilation, umbilical vein catheterization, central venous catheter, parenteral nutrition and hospitalization time were risk factors for nosocomial infections in extremely preterm infants. Logistic regression analysis showed that length of hospitalization (OR = 1.024, P = 0.043) and central venous catheterization (OR = 6.170, P = 0.041) were independent risk factors of nosocomial infection.

CONCLUSIONExtremely preterm infants were at higher risk of nosocomial infection. It is important to identify the high risk factors for nosocomial infections in extremely premature infants. To shorten time for mechanical ventilation, central venous catheterization and hospitalization days would be conducive to reducing the morbidity of nosocomial infection.

Birth Weight ; Catheterization, Central Venous ; adverse effects ; Cross Infection ; epidemiology ; microbiology ; Female ; Gram-Negative Bacteria ; isolation & purification ; Gram-Positive Bacteria ; isolation & purification ; Humans ; Incidence ; Infant, Extremely Premature ; Infant, Newborn ; Infant, Premature, Diseases ; epidemiology ; microbiology ; Intensive Care Units, Neonatal ; Logistic Models ; Male ; Pneumonia, Ventilator-Associated ; epidemiology ; microbiology ; Respiration, Artificial ; adverse effects ; Retrospective Studies ; Risk Factors ; Sepsis ; epidemiology ; microbiology

A prospective multicenter observational study was performed to investigate the epidemiology and outcomes of community-acquired severe sepsis and septic shock. Subjects included 1,192 adult patients admitted to the 22 participating intensive care units (ICUs) of 12 university hospitals in the Korean Sepsis Registry System from April, 2005 through February, 2009. Male accounted for 656 (55%) patients. Mean age was 65.0 +/- 14.2 yr. Septic shock developed in 740 (62.1%) patients. Bacteremia was present in 422 (35.4%) patients. The 28-day and in-hospital mortality rates were 23.0% and 28.0%, respectively. Men were more likely to have comorbid illnesses and acute organ dysfunctions, and had higher mortality and clinical severity compared to women. While respiratory sources of sepsis were common in men, urinary sources were predominant in women. In the multivariate logistic regression analysis, cancer (odds ratio 1.89; 95% confidence interval 1.13-3.17), urinary tract infection (0.25; 0.13-0.46), APACHE II score (1.05; 1.02-1.09), SOFA score on day 1 (1.13; 1.06-1.21) and metabolic dysfunction (2.24, 1.45-3.45) were independent clinical factors for gender-related in-hospital mortality. This study provided epidemiological and clinical characteristics of community-acquired severe sepsis and septic shock in ICUs in Korea, and demonstrated the impact of clinical factors on gender difference in mortality.
APACHE ; Adult ; Aged ; Aged, 80 and over ; Bacteremia/epidemiology/microbiology ; Community-Acquired Infections/epidemiology/microbiology/virology ; Comorbidity ; Female ; Hospital Mortality ; Hospitals, University ; Humans ; Intensive Care Units ; Logistic Models ; Lung Diseases/epidemiology ; Male ; Metabolic Diseases/epidemiology ; Middle Aged ; Neoplasms/epidemiology ; Odds Ratio ; Prospective Studies ; Republic of Korea ; Risk Factors ; Sepsis/diagnosis/*epidemiology/mortality ; Severity of Illness Index ; Sex Factors ; Shock, Septic/diagnosis/*epidemiology/mortality ; Urinary Tract Infections/epidemiology

A prospective multicenter observational study was performed to investigate the epidemiology and outcomes of community-acquired severe sepsis and septic shock. Subjects included 1,192 adult patients admitted to the 22 participating intensive care units (ICUs) of 12 university hospitals in the Korean Sepsis Registry System from April, 2005 through February, 2009. Male accounted for 656 (55%) patients. Mean age was 65.0 +/- 14.2 yr. Septic shock developed in 740 (62.1%) patients. Bacteremia was present in 422 (35.4%) patients. The 28-day and in-hospital mortality rates were 23.0% and 28.0%, respectively. Men were more likely to have comorbid illnesses and acute organ dysfunctions, and had higher mortality and clinical severity compared to women. While respiratory sources of sepsis were common in men, urinary sources were predominant in women. In the multivariate logistic regression analysis, cancer (odds ratio 1.89; 95% confidence interval 1.13-3.17), urinary tract infection (0.25; 0.13-0.46), APACHE II score (1.05; 1.02-1.09), SOFA score on day 1 (1.13; 1.06-1.21) and metabolic dysfunction (2.24, 1.45-3.45) were independent clinical factors for gender-related in-hospital mortality. This study provided epidemiological and clinical characteristics of community-acquired severe sepsis and septic shock in ICUs in Korea, and demonstrated the impact of clinical factors on gender difference in mortality.
APACHE ; Adult ; Aged ; Aged, 80 and over ; Bacteremia/epidemiology/microbiology ; Community-Acquired Infections/epidemiology/microbiology/virology ; Comorbidity ; Female ; Hospital Mortality ; Hospitals, University ; Humans ; Intensive Care Units ; Logistic Models ; Lung Diseases/epidemiology ; Male ; Metabolic Diseases/epidemiology ; Middle Aged ; Neoplasms/epidemiology ; Odds Ratio ; Prospective Studies ; Republic of Korea ; Risk Factors ; Sepsis/diagnosis/*epidemiology/mortality ; Severity of Illness Index ; Sex Factors ; Shock, Septic/diagnosis/*epidemiology/mortality ; Urinary Tract Infections/epidemiology

BACKGROUNDEncephalopathy is a common complication of sepsis, and its onset can occur at any stage of sepsis and implies worse prognosis. However, the incidence, epidemiology, and pathogenesis of sepsis-associated encephalopathy remain controversial. The purpose of this study was to investigate the epidemiological features and risk factors for sepsis-associated encephalopathy.

METHODSOur retrospective study included all patients with sepsis admitted to our intensive care unit from 2008 to 2011. After excluding 91 patients, 232 patients were assigned to either a sepsis-associated encephalopathy group or sepsis without encephalopathy group. Between-group differences in baseline patient data including vital signs, disease severity, pathogens, sites of infection, biochemical indicators, and time on a mechanical ventilator, intensive care unit (ICU) stay, and 28-day mortality rate were analyzed.

RESULTSThe incidence of sepsis-associated encephalopathy was 17.7%. The sepsis-associated encephalopathy group had significantly higher 28-day mortality (56.1% vs. 35.1%; P=0.013), spent a significantly longer time on a ventilator ((8.2±2.2) days vs. (2.9±0.4) days; P=0.021), and had a significantly longer ICU stay ((12.4±2.4) days vs. (7.1±0.6) days; P=0.042). Acute physiology and chronic health evaluation II score, Glasgow coma scale, heart rate, blood lactate, serum sodium, platelets, serum albumin, and pH values were related to the presence of encephalopathy. Patients with biliary tract infections and intestinal infections caused by Staphylococcus aureus, Enterococcus faecium, Acinetobacter spp, Pseudomonas aeruginosa, and Stenotrophomonas maltophilia, were more prone to develop sepsis-associated encephalopathy.

CONCLUSIONSEncephalopathy increases mortality rate in septic patients. Clinical intervention to reduce risk factors and thereby morbidity and mortality depends on a correct understanding of the differences between patients with sepsis and patients with both sepsis and encephalopathy.

Adult ; Aged ; Brain Diseases ; epidemiology ; etiology ; microbiology ; Female ; Humans ; Intensive Care Units ; Male ; Middle Aged ; Retrospective Studies ; Risk Factors ; Sepsis ; complications ; epidemiology ; microbiology

There were many reports of longitudinal changes in the causative organisms of neonatal sepsis in Western countries but few in Asia. We aimed to study longitudinal trends in the epidemiology of neonatal sepsis at Seoul National University Children's Hospital (SNUCH), a tertiary center in Korea, and compared the results to previous studies of Western countries. The medical records of all of the neonates who were hospitalized at SNUCH from 1996 to 2005 with positive blood cultures were reviewed. We also compared the findings to previous 16-yr (1980-1995). One hundred and forty-nine organisms were identified in 147 episodes from 134 infants. In comparison with the previous 16-yr studies, there was a decrease in the number of Escherichia coli infections (16.2% vs 8.7%: odds ratio [OR] 0.495; 95% confidence interval [CI], 0.255-0.962; P = 0.035), but an increase in Staphylococcus aureus (16.6% vs 25.5%: OR 1.720; 95% CI, 1.043-2.839; P = 0.033) and fungal infections (3.3% vs 18.7%: OR 6.740; 95% CI, 2.981-15.239; P < 0.001), predominantly caused by Candida species. In conclusion, the incidence of sepsis caused by E. coli decreases, but S. aureus and fungal sepsis increases significantly. Compared with Western studies, the incidence of sepsis caused by S. aureus and fungus has remarkably increased.
*Hospitals ; Humans ; Infant ; Infant, Newborn ; Infant, Newborn, Diseases/*epidemiology/microbiology ; Intensive Care Units, Neonatal ; Longitudinal Studies ; Mycoses/epidemiology ; Republic of Korea/epidemiology ; Sepsis/*epidemiology/microbiology ; Staphylococcal Infections/epidemiology