Pericarditis laboratory studies: Difference between revisions
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==Overview== | ==Overview== | ||
Non-specific markers of [[inflammation]] are generally elevated in [[pericarditis]]. These include the [[leukocyte]] count, | Non-specific markers of [[inflammation]] are generally elevated in [[pericarditis]]. These include the [[leukocyte]] count, [[C-reactive protein]], and [[ESR]]. The [[cardiac troponin]] is elevated if there is an injury to the underlying [[myocardium]], a condition termed as myopericarditis. Diagnostic [[pericardiocentesis]] and [[biopsy]] help in identifying an underlying infectious or malignant process. | ||
==Inflammatory Markers== | ==Inflammatory Markers== | ||
Revision as of 16:23, 29 November 2012
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor-In-Chief: Varun Kumar, M.B.B.S.
Overview
Non-specific markers of inflammation are generally elevated in pericarditis. These include the leukocyte count, C-reactive protein, and ESR. The cardiac troponin is elevated if there is an injury to the underlying myocardium, a condition termed as myopericarditis. Diagnostic pericardiocentesis and biopsy help in identifying an underlying infectious or malignant process.
Inflammatory Markers
The following inflammatory markers are often elevated:
- CBC: Significant leukocytosis may be present.
- C-reactive protein
- Erythrocyte sedimentation rate (ESR)
Markers of Myonecrosis
The following markers of myonecrosis may be elevated if there is involvement of the underlying myocardium:
- Creatine Kinase: Acute pericarditis may be associated with a modest increase in serum creatine kinase MB (CK-MB) depending upon the extent of involvement of the underlying myocardium.[1][2]
- Cardiac troponin I (cTnI).[3][4]. The troponin can be elevated if there is an underlying myositis, or a myopericarditis. In Europe, patients with pericarditis and an elevated troponin are hospitalized briefly to assure that the patient is stable.
- LDH: depends on the extent of myocardial involvement
- Serum myoglobin
Autoimmune Markers
Autoimmune markers may be checked in patients with recurrent disease.
Gallium-67 Imaging
Gallium-67 scanning may help identify inflammatory and leukemic infiltrations.
Diagnositic Pericardiocentesis
Pericardial fluid should be aspirated and tested for presence of malignant cells and tumor markers particularly in patients with hemorrhagic effusion without preceding trauma[5]. However, hemorrhagic pericarditis in developing countries could be due to tuberculosis. Sensitivity of cytological analysis of pericardial fluid for malignant cells were 67%[6], 75%[7] and 92%[8] in different studies with specificity of 100%. Immunohistochemistry can be used to distinguish between the malignant cells and their possible origin[9][10].
Fluid aspirated can also be used for following tests:
- Gram staining
- Acid-fast staining
- Culture
Pericardial Biopsy
If the clinical suspicion of malignancy is high, and if the results of cytology testing from the pericardiocentesis are negative, consideration should be given to performing a pericardial biopsy. This can be performed via either a subxiphoid or transthoracic pericardiostomy or alternatively by pericardioscopy. An advantage of pericardioscopy is that it assists in the direct visualization of pericardium and collecting the biopsy sample. Pericardioscopy has an excellent sensitivity of 97%[7][11] which compares quite favorably to a blind biopsy which has a low sensitivity of 55-65%.
References
- ↑ Spodick DH (2003). "Acute pericarditis: current concepts and practice". JAMA. 289 (9): 1150–3. doi:10.1001/jama.289.9.1150. PMID 12622586.
- ↑ Karjalainen J, Heikkila J (1986). ""Acute pericarditis": myocardial enzyme release as evidence for myocarditis". Am Heart J. 111 (3): 546–52. doi:10.1016/0002-8703(86)90062-1. PMID 3953365.
- ↑ Bonnefoy E, Godon P, Kirkorian G, Fatemi M, Chevalier P, Touboul P (2000). "Serum cardiac troponin I and ST-segment elevation in patients with acute pericarditis". Eur Heart J. 21 (10): 832–6. doi:10.1053/euhj.1999.1907. PMID 10781355.
- ↑ Imazio M, Demichelis B, Cecchi E, Belli R, Ghisio A, Bobbio M, Trinchero R (2003). "Cardiac troponin I in acute pericarditis". J Am Coll Cardiol. 42 (12): 2144–8. doi:10.1016/j.jacc.2003.02.001. PMID 14680742.
- ↑ Atar S, Chiu J, Forrester JS, Siegel RJ (1999). "Bloody pericardial effusion in patients with cardiac tamponade: is the cause cancerous, tuberculous, or iatrogenic in the 1990s?". Chest. 116 (6): 1564–9. PMID 10593777.
- ↑ Wiener HG, Kristensen IB, Haubek A, Kristensen B, Baandrup U (1991). "The diagnostic value of pericardial cytology. An analysis of 95 cases". Acta Cytol. 35 (2): 149–53. PMID 2028688.
- ↑ 7.0 7.1 Porte HL, Janecki-Delebecq TJ, Finzi L, Métois DG, Millaire A, Wurtz AJ (1999). "Pericardoscopy for primary management of pericardial effusion in cancer patients". Eur J Cardiothorac Surg. 16 (3): 287–91. PMID 10554845.
- ↑ Meyers DG, Meyers RE, Prendergast TW (1997). "The usefulness of diagnostic tests on pericardial fluid". Chest. 111 (5): 1213–21. PMID 9149572.
- ↑ Gong Y, Sun X, Michael CW, Attal S, Williamson BA, Bedrossian CW (2003). "Immunocytochemistry of serous effusion specimens: a comparison of ThinPrep vs cell block". Diagn Cytopathol. 28 (1): 1–5. doi:10.1002/dc.10219. PMID 12508174.
- ↑ Mayall F, Heryet A, Manga D, Kriegeskotten A (1997). "p53 immunostaining is a highly specific and moderately sensitive marker of malignancy in serous fluid cytology". Cytopathology. 8 (1): 9–12. PMID 9068950.
- ↑ Nugue O, Millaire A, Porte H, de Groote P, Guimier P, Wurtz A; et al. (1996). "Pericardioscopy in the etiologic diagnosis of pericardial effusion in 141 consecutive patients". Circulation. 94 (7): 1635–41. PMID 8840855.