tetano
Editor, Senior Moderator
Crit Care Med. 2012 May;40(5):1487-1498.
Critical illness from 2009 pandemic influenza A virus and bacterial coinfection in the United States*
Rice TW, Rubinson L, Uyeki TM, Vaughn FL, John BB, Miller RR 3rd, Higgs E, Randolph AG, Smoot BE, Thompson BT; for the NHLBI ARDS Network.
Source
From the Vanderbilt University School of Medicine (TWR), Nashville, TN; National Disaster Medical System (LR), HHS/ASPR/OPEO; National Center for Immunization and Respiratory Diseases (TMU), Centers for Disease Control and Prevention; Emergency Care Coordination Center (FLV, BBJ), HHS/ASPR/OPEO; Intermountain Medical Center and University of Utah School of Medicine (RRM), Salt Lake City, UT; Division of Clinical Research (EH), National Institutes of Allergy and Infectious Diseases, NIH; Children's Hospital Boston (AGR), Boston, MA; Harvard Medical School (BES), Boston, MA; Massachusetts General Hospital (BTT), Harvard Medical School, Boston, MA.
Abstract
OBJECTIVES:
The contribution of bacterial coinfection to critical illness associated with 2009 influenza A virus infection remains uncertain. The objective of this study was to determine whether bacterial coinfection increased the morbidity and mortality of 2009 influenza A.
DESIGN:
Retrospective and prospective cohort study.
SETTING:
Thirty-five adult U.S. intensive care units over the course of 1 yr.
PATIENTS:
Six hundred eighty-three critically ill adults with confirmed or probable 2009 influenza A.
INTERVENTIONS:
None.
MEASUREMENTS AND MAIN RESULTS:
A confirmed or probable case was defined as a positive 2009 influenza A test result or positive test for influenza A that was otherwise not subtyped. Bacterial coinfection was defined as documented bacteremia or any presumed bacterial pneumonia with or without positive respiratory tract culture within 72 hrs of intensive care unit admission. The mean age was 45 ± 16 yrs, mean body mass index was 32.5 ± 11.1 kg/m, and mean Acute Physiology and Chronic Health Examination II score was 21 ± 9, with 76% having at least one comorbidity. Of 207 (30.3%) patients with bacterial coinfection on intensive care unit admission, 154 had positive cultures with Staphylococcus aureus (n = 57) and Streptococcus pneumoniae (n = 19), the most commonly identified pathogens. Bacterial coinfected patients were more likely to present with shock (21% vs. 10%; p = .0001), require mechanical ventilation at the time of intensive care unit admission (63% vs. 52%; p = .005), and have longer duration of intensive care unit care (median, 7 vs. 6 days; p = .05). Hospital mortality was 23%; 31% in bacterial coinfected patients and 21% in patients without coinfection (p = .002). Immunosuppression (relative risk 1.57; 95% confidence interval 1.20 -2.06; p = .0009) and Staphylococcus aureus at admission (relative risk 2.82; 95% confidence interval 1.76-4.51; p < .0001) were independently associated with increased mortality.
CONCLUSIONS:
Among intensive care unit patients with 2009 influenza A, bacterial coinfection diagnosed within 72 hrs of admission, especially with Staphylococcus aureus, was associated with significantly higher morbidity and mortality.
PMID:
22511131
[PubMed - as supplied by publisher]
http://www.ncbi.nlm.nih.gov/pubmed/22511131
Critical illness from 2009 pandemic influenza A virus and bacterial coinfection in the United States*
Rice TW, Rubinson L, Uyeki TM, Vaughn FL, John BB, Miller RR 3rd, Higgs E, Randolph AG, Smoot BE, Thompson BT; for the NHLBI ARDS Network.
Source
From the Vanderbilt University School of Medicine (TWR), Nashville, TN; National Disaster Medical System (LR), HHS/ASPR/OPEO; National Center for Immunization and Respiratory Diseases (TMU), Centers for Disease Control and Prevention; Emergency Care Coordination Center (FLV, BBJ), HHS/ASPR/OPEO; Intermountain Medical Center and University of Utah School of Medicine (RRM), Salt Lake City, UT; Division of Clinical Research (EH), National Institutes of Allergy and Infectious Diseases, NIH; Children's Hospital Boston (AGR), Boston, MA; Harvard Medical School (BES), Boston, MA; Massachusetts General Hospital (BTT), Harvard Medical School, Boston, MA.
Abstract
OBJECTIVES:
The contribution of bacterial coinfection to critical illness associated with 2009 influenza A virus infection remains uncertain. The objective of this study was to determine whether bacterial coinfection increased the morbidity and mortality of 2009 influenza A.
DESIGN:
Retrospective and prospective cohort study.
SETTING:
Thirty-five adult U.S. intensive care units over the course of 1 yr.
PATIENTS:
Six hundred eighty-three critically ill adults with confirmed or probable 2009 influenza A.
INTERVENTIONS:
None.
MEASUREMENTS AND MAIN RESULTS:
A confirmed or probable case was defined as a positive 2009 influenza A test result or positive test for influenza A that was otherwise not subtyped. Bacterial coinfection was defined as documented bacteremia or any presumed bacterial pneumonia with or without positive respiratory tract culture within 72 hrs of intensive care unit admission. The mean age was 45 ± 16 yrs, mean body mass index was 32.5 ± 11.1 kg/m, and mean Acute Physiology and Chronic Health Examination II score was 21 ± 9, with 76% having at least one comorbidity. Of 207 (30.3%) patients with bacterial coinfection on intensive care unit admission, 154 had positive cultures with Staphylococcus aureus (n = 57) and Streptococcus pneumoniae (n = 19), the most commonly identified pathogens. Bacterial coinfected patients were more likely to present with shock (21% vs. 10%; p = .0001), require mechanical ventilation at the time of intensive care unit admission (63% vs. 52%; p = .005), and have longer duration of intensive care unit care (median, 7 vs. 6 days; p = .05). Hospital mortality was 23%; 31% in bacterial coinfected patients and 21% in patients without coinfection (p = .002). Immunosuppression (relative risk 1.57; 95% confidence interval 1.20 -2.06; p = .0009) and Staphylococcus aureus at admission (relative risk 2.82; 95% confidence interval 1.76-4.51; p < .0001) were independently associated with increased mortality.
CONCLUSIONS:
Among intensive care unit patients with 2009 influenza A, bacterial coinfection diagnosed within 72 hrs of admission, especially with Staphylococcus aureus, was associated with significantly higher morbidity and mortality.
PMID:
22511131
[PubMed - as supplied by publisher]
http://www.ncbi.nlm.nih.gov/pubmed/22511131
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