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Procalcitonin in critical illness.

E O'Connor1, B Venkatesh, J Lipman

  • 1Department of Intensive Care, Royal Brisbane Hospital, Brisbane, Queensland.

Critical Care and Resuscitation : Journal of the Australasian Academy of Critical Care Medicine
|April 1, 2006
PubMed
Summary

This review explores the role of serum procalcitonin in diagnosing infections in critically ill patients. Procalcitonin is a precursor to the hormone calcitonin and appears to rise during sepsis. Researchers examined studies from 1990 to 2001 to assess its usefulness in distinguishing between infectious and non-infectious causes of inflammation. While some evidence suggests it may be helpful in identifying bacterial infections like meningitis, its specificity is limited in certain non-infectious conditions. The exact biological function of procalcitonin during sepsis is still unclear. The authors conclude that while it shows promise as a diagnostic tool, further research is needed to confirm its value and understand its role in the body.

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Area of Science:

  • Critical care medicine
  • Infectious disease diagnostics
  • Inflammatory biomarker research

Background:

The ability to distinguish between infectious and non-infectious causes of systemic inflammation remains a challenge in critical care. While calcitonin is a well-known hormone, its precursor procalcitonin has emerged as a possible indicator of infection. Prior research has shown that acute phase reactants like C-reactive protein can signal inflammation but lack specificity for infection. This gap motivated further investigation into procalcitonin's potential as a more targeted diagnostic tool. No prior work had resolved the exact mechanisms by which procalcitonin levels rise during sepsis. Researchers have noted that non-infectious conditions can also elevate procalcitonin, complicating its interpretation. The biological role of procalcitonin during critical illness remains unclear. This uncertainty has driven continued exploration of its diagnostic value in clinical settings.

Purpose Of The Study:

This review aimed to assess the current understanding of procalcitonin's biology and diagnostic role in critical illness. The specific problem addressed is the need for a reliable marker to differentiate between infectious and non-infectious systemic inflammation. The motivation stems from the limitations of existing acute phase reactants in providing clear infection-specific signals. Researchers sought to evaluate whether procalcitonin could offer improved diagnostic accuracy in sepsis. The study focused on published literature from 1990 to 2001 to capture early developments in this field. The goal was to synthesize findings on procalcitonin's behavior during sepsis and its utility in clinical decision-making. The review also aimed to highlight unresolved questions about procalcitonin's biological function. This approach allows for a comprehensive overview of its diagnostic promise and limitations.

Keywords:
Critical care biomarkersInfection detectionSepsis markersInflammatory response indicators

Frequently Asked Questions

It may help differentiate between infectious and non-infectious systemic inflammation.

Non-infectious inflammatory conditions can also lead to increased serum procalcitonin.

The exact origin and biological function of procalcitonin in sepsis remain unresolved.

Its superiority over other markers like C-reactive protein is still debated.

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Main Methods:

The researchers conducted a systematic review of peer-reviewed articles. They searched MEDLINE for publications related to procalcitonin between 1990 and 2001. The focus was on studies that examined serum procalcitonin levels in critical illness. The review approach included analyzing how procalcitonin behaves in infectious versus non-infectious conditions. The team evaluated the diagnostic accuracy of procalcitonin in sepsis and other inflammatory states. They compared findings across different clinical scenarios to assess consistency. The review also considered the biological mechanisms behind procalcitonin elevation. This method allowed for a synthesis of evidence on its clinical and biological relevance.

Main Results:

Serum procalcitonin levels rise during sepsis, suggesting a potential role as an infection marker. Studies indicate it may help differentiate between bacterial and viral meningitis. The strongest evidence supports its use in distinguishing infectious from non-infectious systemic inflammation. However, non-infectious conditions can also cause elevated procalcitonin levels. This reduces its specificity in certain clinical contexts. Some research suggests it may outperform other acute phase reactants in sepsis detection. The exact biological function of procalcitonin during sepsis remains unclear. These findings highlight both its promise and the need for further investigation.

Conclusions:

The authors suggest that procalcitonin may serve as a useful diagnostic tool in critical illness. They propose that it could help differentiate between infectious and non-infectious inflammation. However, they emphasize that its specificity is limited in some non-infectious conditions. The debate continues regarding its superiority over other acute phase reactants. The biological role of procalcitonin during sepsis remains unresolved. Researchers suggest that its target receptors and protective value are still under investigation. The diagnostic utility of serum procalcitonin in sepsis is still being evaluated. These conclusions reflect the current state of evidence without overreaching into unproven claims.

Some studies suggest it may help differentiate between these two types of meningitis.

Its target receptors and protective value to the patient remain unclear.