Acute and Critical Care

Original Articles

Pulmonary
The frequency and seasonal distribution of viral infection in patients with community-acquired pneumonia and its impact on the prognosis: Kyung Jun Kim, Doh Hyung Kim; Acute Crit Care. 2022;37(4):550-560. Published online October 6, 2022; DOI: https://doi.org/10.4266/acc.2022.00682

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Background
Studies on the effects of viral coinfection on bacterial pneumonia are still scarce in South Korea. This study investigates the frequency and seasonal distribution of virus infection and its impact on the prognosis in patients with community-acquired pneumonia (CAP).
Methods
The medical records of CAP patients with definite etiology, such as viruses and bacteria, were retrospectively reviewed. Their epidemiologic and clinical characteristics, microbiologic test results, the severity of illness, and 30-day mortality were analyzed.
Results
Among 150 study subjects, 68 patients (45.3%) had viral infection alone, 47 (31.3%) had bacterial infection alone, and 35 (23.3%) had viral-bacterial coinfection, respectively. Among 103 patients with viral infections, Influenza A virus (44%) was the most common virus, followed by rhinovirus (19%), influenza B (13%), and adenovirus (6%). The confusion-urea-respiratory rateblood pressure-age of 65 (CURB-65) score of the viral-bacterial coinfection was higher than that of the viral infection (median [interquartile range]: 2.0 [1.0–4.0] vs. 2.0 [0.3–3.0], P=0.029). The 30-day mortality of the viral infection alone group (2.9%) was significantly lower than that of bacterial infection alone (19.1%) and viral-bacterial coinfection (25.7%) groups (Bonferroni-corrected P<0.05). Viral-bacterial coinfection was the stronger predictor of 30-day mortality in CAP (odds ratio [OR], 18.9; 95% confidence interval [CI], 3.0–118.3; P=0.002) than bacterial infection alone (OR, 6.3; 95% CI, 1.1–36.4; P=0.041), compared to viral infection alone on the multivariate analysis.
Conclusions
The etiology of viral infection in CAP is different according to regional characteristics. Viral-bacterial coinfection showed a worse prognosis than bacterial infection alone in patients with CAP.

Citations

Citations to this article as recorded by

Clinical characteristics of pathogens in children with community-acquired pneumonia were analyzed via targeted next-generation sequencing detection
Junhua Zhao, Mingfeng Xu, Zheng Tian, Yu Wang
PeerJ.2025; 13: e18810. CrossRef
Comparing viral, bacterial, and coinfections in community-acquired pneumonia, a retrospective cohort study
Frederike Waldeck, Solveig Lemmel, Marcus Panning, Nadja Käding, Andreas Essig, Gernot Rohde, Mathias W. Pletz, Martin Witzenrath, Sebastien Boutin, Jan Rupp
International Journal of Infectious Diseases.2025; 154: 107841. CrossRef
Seasonal Patterns of Common Respiratory Viral Infections in Immunocompetent and Immunosuppressed Patients
Fotis Theodoropoulos, Anika Hüsing, Ulf Dittmer, Karl-Heinz Jöckel, Christian Taube, Olympia E. Anastasiou
Pathogens.2024; 13(8): 704. CrossRef

Infection
Comparison of critically ill COVID-19 and influenza patients with acute respiratory failure: Mehmet Yildirim, Burcin Halacli, Mehmet Yasir Pektezel, Berrin Er, Ismail Tuna Geldigitti, Gulay Tok, Ebru Ortac Ersoy, Arzu Topeli; Acute Crit Care. 2022;37(2):168-176. Published online March 11, 2022; DOI: https://doi.org/10.4266/acc.2021.00920

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Abstract PDF

Background
Coronavirus disease 2019 (COVID-19) is one of the biggest pandemic causing acute respiratory failure (ARF) in the last century. Seasonal influenza carries high mortality, as well. The aim of this study was to compare features and outcomes of critically-ill COVID-19 and influenza patients with ARF.
Methods
Patients with COVID-19 and influenza admitted to intensive care unit with ARF were retrospectively analyzed.
Results
Fifty-four COVID-19 and 55 influenza patients with ARF were studied. Patients with COVID-19 had 32% of hospital mortality, while those with influenza had 47% (P=0.09). Patients with influenza had higher Eastern Cooperative Oncology Group, Clinical Frailty Scale, Acute Physiology and Chronic Health Evaluation II and admission Sequential Organ Failure Assessment (SOFA) scores than COVID-19 patients (P<0.01). Secondary bacterial infection, admission acute kidney injury, procalcitonin level above 0.2 ng/ml were the independent factors distinguishing influenza from COVID-19 while prone positioning differentiated COVID-19 from influenza. Invasive mechanical ventilation (odds ratio [OR], 42.16; 95% confidence interval [CI], 9.45–187.97), admission SOFA score more than 4 (OR, 5.92; 95% CI, 1.85–18.92), malignancy (OR, 4.95; 95% CI, 1.13–21.60), and age more than 65 years (OR, 3.31; 95% CI, 0.99–11.03) were found to be independent risk factors for hospital mortality.
Conclusions
There were few differences in clinical features of critically-ill COVID-19 and influenza patients. Influenza cases had worse performance status and disease severity. There was no significant difference in hospital mortality rates between COVID-19 and influenza patients.

Citations

Citations to this article as recorded by

Narrative review of factors associated with SARS-CoV-2 coinfection in Middle Eastern countries and the need to vaccinate against preventable diseases
Majid Alshamrani, Fayssal Farahat, Ali Albarrak, Aiman El-Saed, Atef M. Shibl, Ziad A. Memish, Mostafa Mousa, Hammam Haridy, Abdulhakeem Althaqafi
Journal of Infection and Public Health.2025; 18(1): 102600. CrossRef
Comparison of Clinical Characteristics and Outcomes in Intensive Care Units Between Patients with Coronavirus Disease 2019 (COVID-19) and Patients with Influenza: A Systematic Review and Meta-Analysis
Zhuan Zhong, Xin Wang, Jia Guo, Xingzhao Li, Yingying Han
Journal of Intensive Care Medicine.2024; 39(9): 840. CrossRef
Association between PaO2/(FiO2*PEEP) ratio and in-hospital mortality in COVID-19 patients: A reanalysis of published data from Peru using PaO2/(FiO2*PEEP) ratio in place of PaO2/FaO2 ratio
Youli Chen, Huangen Li, Jinhuang Lin, Zhiwei Su, Tianlai Lin
Medicine.2024; 103(40): e39931. CrossRef
Acute kidney injury in patients with COVID-19 compared to those with influenza: a systematic review and meta-analysis
Chiu-Ying Hsiao, Heng-Chih Pan, Vin-Cent Wu, Ching-Chun Su, Tzu-Hsuan Yeh, Min-Hsiang Chuang, Kuan-Chieh Tu, Hsien-Yi Wang, Wei-Chih Kan, Chun-Chi Yang, Jui-Yi Chen
Frontiers in Medicine.2023;[Epub] CrossRef
Comparison of Clinical Features and Outcomes between SARS-CoV-2 and Non-SARS-CoV-2 Respiratory Viruses Associated Acute Respiratory Distress Syndrome: Retrospective Analysis
Manbong Heo, Jong Hwan Jeong, Sunmi Ju, Seung Jun Lee, Yi Yeong Jeong, Jong Deog Lee, Jung-Wan Yoo
Journal of Clinical Medicine.2022; 11(8): 2246. CrossRef

Case Reports

Stress-induced Cardiomyopathy Associated with Swine Influenza Infection Which Exacerbated Underlying Emphysema: A Case Report: Sung Gook Song, June Hong Kim, Kook Jin Chun, Jun Kim, Yong Hyun Park, Jeong Su Kim, Ju Hyun Park, Dong Cheul Han, Woo Hyun Cho, Doo Soo Jeon, Yun Seong Kim; Korean J Crit Care Med. 2010;25(4):245-248.; DOI: https://doi.org/10.4266/kjccm.2010.25.4.245

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Abstract PDF: Stress-induced cardiomyopathy (SICM) is an acute cardiac condition that causes left ventricular apical ballooning which mimicks acute coronary syndrome. The risk of in-hospital mortality with SICM is generally low (1% to 3%) and supportive care is usually sufficient for resolution. Swine-origin influenza A (H1N1, S-OIV) is a recently spreading pandemic and a serious public health problem. Although most S-OIV infections have a mild, self-limited course, clinical cases resulting in fatalities and associated with variable co-morbidities remain as a serious concern in some individuals. Among such serious complications, there have been few reports of SICM caused by S-OIV infection. We herein report, for the first time in the literature, a case with fatal hemodynamic instability secondary to SICM caused by S-OIV infection with viral pneumonia.

Two Cases of Spontaneous Pneumomediastinum Complicating Viral Pneumonia Caused by Influenza A Virus, (H1N1 Subtype): A Case Report: Jae Woong Tae, Eun Jin Kim, Woo Jin Jang, Min Jeong Kim, Hae Ri Chon, Eun Soo Jeong, Young Min Koh; Korean J Crit Care Med. 2010;25(3):163-167.; DOI: https://doi.org/10.4266/kjccm.2010.25.3.163

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Abstract PDF: Influenza A virus, (H1N1 Subtype), was identified as the cause of outbreaks of febrile respiratory infection in Mexico, the US, Canada and elsewhere during the spring of 2009. In Korea, a novel virus infection showing many variable complications was also pandemic. We report two cases of spontaneous pneumomediastinum, complicating viral pneumonia, caused by Influenza A virus, (H1N1 Subtype).

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