Acute and Critical Care

Yun Su Sim

2 Articles

The Consistency and Clinical Significance between Bronchoscopic Samples and Endotracheal or Tracheostomic Aspirates in Severe Pneumonia Under Mechanical Ventilation: Hye Sung Park, Seo Woo Kim, Yun Su Sim, Ji Hye Kim, Yon Ju Ryu, Jin Hwa Lee, Jung Hyun Chang; Korean J Crit Care Med. 2011;26(2):83-88.; DOI: https://doi.org/10.4266/kjccm.2011.26.2.83

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BACKGROUND
Distal airway bacterial colonization occurs more frequently in patients with endotracheal tubes or tracheostomy of intensive care units (ICU) care. In general, bronchoscopic samples are considered more accurate than transtracheal aspirates. In this study, we evaluated the consistency and clinical significance between bronchoscopic samples and transtracheal aspirates (TTA) in severe pneumonia under mechanical ventilation.
METHODS
We investigated the consistency between bronchoscopic samples and transtracheal aspirates among patients with endotracheal tubes or tracheostomy, retrospectively. Fiberoptic bronchoscopy was performed in 212 patients with mechanical ventilation via endotracheal tube or tracheostomy between January 1st, 2004 and December 31th, 2008 in ICU at Ewha Womans University Hospital. We evaluated consistency in terms of true pathogen according to the arbitrary ICU days progress.
RESULTS
Among the 212 enrolled patients, 113 (53%) had consistency between bronchoscopic samples and transtracheal aspirates. When evaluated alteration trends in consistency according to ICU stay, the consistency was maintained for 5 to 9 ICU days with statistical significance (p< 0.05) since adjusting for age, sex, and combined risk factors. Consistency in sampling status between the endotracheal tube and tracheostomy was also evaluated, however, there was no statistical significance (OR 1.9 vs. 1, 95% CI = 0.997-3.582, p = 0.051).
CONCLUSIONS
Shorter hospital stay (within 9 days of ICU stay) had higher probability of consistency between bronchoscopic samples and TTA samples. TTA may be as confident as bronchoscopic samples in patients of pneumonia under mechanical ventilation with shorter ICU stays, especially less than 10 days.

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Comparison of the Pattern in Semi-Quantitative Sputum Cultures Based on Different Endotracheal Suction Techniques
Jiwoong Oh, Kum Whang, Hyenho Jung, Jongtaek Park
Korean Journal of Critical Care Medicine.2012; 27(2): 70. CrossRef

Lactate Clearance and Outcome in Septic Shock Patients with Low Level of Initial Lactate: Yun Su Sim, Cho Rom Hahm, So Yeon Lim, Gee Young Suh, Kyeongman Jeon; Korean J Crit Care Med. 2011;26(2):78-82.; DOI: https://doi.org/10.4266/kjccm.2011.26.2.78

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Abstract PDF: BACKGROUND
Serum lactate is a potentially useful biomarker to risk-stratify patients with severe sepsis and septic shock. However, there are only a few studies on the association of serum lactate levels and prognosis in septic shock patients with initial low lactate levels.
METHODS
To evaluate whether initial and follow-up lactate levels associated with mortality in septic shock patients with low lactate level, we conducted a retrospective observational study of patients with septic shock, who were hospitalized through the emergency department in February-July 2008. Initial lactate level was stratified as low (<4 mmol/L) or high (> or =4 mmol/L). The primary outcome was 28-day mortality and multiple logistic regression analysis was used to adjust for potential confounders in the association between lactate clearance and mortality.
RESULTS
Of 90 patients hospitalized with septic shock during the study period, 68 (76%) patients had low initial lactate. Mortality at 28 days was 18% in patients with low lactate level. In these patients, initial lactate level was not associated with mortality (p = 0.590). However, increased lactate at follow-up and lactate clearance were associated with mortality (p = 0.006, p = 0.002, respectively). In a multiple logistic regression analysis, increased mortality rate independently associated with age (OR 1.162, 95% CI 1.041-1.298) and lactate clearance (OR 0.654, 95% CI 0.498-0.859).
CONCLUSIONS
In septic shock patients with a low lactate level, lactate clearance independently associated with a decreased mortality rate. Therefore, lactate clearance could be useful for predicting the outcome in these patients.

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