Journal List > Infect Chemother > v.41(6) > 1075490

Lee, Kim, Kim, Park, Kim, Hyun, Woo, and Kim: Usefulness of Semi-quantitative Procalcitonin Assay in Critically Ill Patients with Bacterial Pneumonia

Abstract

Background

In pulmonary infection, serum procalcitonin levels increase rapidly, probably in response to sepsis-related cytokine release from neuroendocrine cells of bronchial epithelium and inflammatory cells. We applied procalcitonin assay in critically ill patients with bacterial pneumonia.

Materials and Methods

Patients admitted to the intensive care unit (ICU) and show diffuse infiltrations in their chest X-ray were included. Quantitative bronchoalveolar lavage (BAL) culture (≥104 CFU/mL) was performed in all cases on the 5th day of ICU admission. We excluded patients with structural lung disease, non-infectious lung infiltrations, and atypical infections such as Mycobacterium tuberculosis, Pneumocystis jiroveci, and viruses. Serum procalcitonin levels were measured semi-quantitatively by using PCT-Q kit.

Results

A total of 28 adult patients (M:F=23:5) were included: 11 (39.3%) medically-ill patients, 7 (25%) surgically-ill patients, and 10 (35.7%) burn patients. Serum procalcitonin level was <0.5 ng/mL in half of the cases (14/28) and ≥0.5 ng/mL in the remaining half of the cases. Compared to those with serum procalcitonin level of <0.5 ng/mL, patients with serum procalcitonin level of ≥0.5 ng/mL had more frequent mechanical ventilation, higher CRP/APACHE II scores/number of organ failure (P<0.05), and showed increased tendency for death (P=0.052). Positive bacterial BAL cultures were noted in 17 cases (60.7%). Of these, 7 cases (41.2%) showed serum procalcitonin level ≥0.5 ng/mL.

Conclusions

High serum procalcitonin level seems to be closely associated with the severity and poor prognosis in critically ill patients with bacterial pneumonia. However, pneumonia could not be excluded with low level of procalcitonin among ICU patients.

Figures and Tables

Table 1
Baseline Characteristics of the Bacterial Pneumonia Patients (n=28)
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Values are number of patients (% of patients) or mean±standard deviation *104 or more CFU/mL on quantitative bronchoalveolar lavage culture.

BAL, bronchoalveolar lavage; APACHE II, acute physiology and chronic health evaluation.

Table 2
Comparison of the Characteristics according to the Application of Mechanical Ventilation (MV)
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Values are presented as mean±standard deviation or No. (%) unless otherwise stated.

*P value=0.023, P value=0.000, P value=0.000, §P value=0.018 in hospital-acquired pneumonia (HAP), in community-acquired pneumonia (CAP), **3 in HAP and 1 in CAP

APACHE, acute physiology and chronic health evaluation; mCPIS, modified clinical pulmonary infection score 14); BAL, bronchoalveolar lavage; MRSA, methicillin-resistant Staphylococcus aureus; MRCNS, methicilin-resistant coagulase-negative Staphylococci

Table 3
Comparison of Parameters according to Bacterial BAL Cultures
ic-41-342-i003

Values are presented as mean±standard deviation or No. (%) unless otherwise stated.

BAL, bronchoalveolar lavage; mCPIS, modified clinical pulmonary infection score (14); APACHE II, acute physiology and chronic health evaluation.

Table 4
Comparison of Parameters according to Serum Procalcitonin Level
ic-41-342-i004

Values are presented as mean±standard deviation or No. (%) unless otherwise stated.

*P value=0.001, P value=0.018, P value=0.005

BAL, bronchoalveolar lavage; mCPIS, modified clinical pulmonary infection score (14); APACHE II, acute physiology and chronic health evaluation.

Table 5
Procalcitonin Level according to the Clinical Outcome
ic-41-342-i005

No, number

*by linear-by-linear association

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