Investigation of cardiac markers cut off values in the diagnosis of acute coronary syndrome
Akut koroner sendrom tanısında kardiyak belirteçlerin kesme değerlerinin incelenmesi
Mustafa Şahin 1 * , Mehmet Kabalcı 2, Ünsal Savcı 3
1 Hitit Üniversitesi Erol Olçok Eğitim ve Araştırma Hastanesi, Tıbbi Biyokimya Laboratuvarı, Çorum, Türkiye
2 Kırıkkale Üniversitesi Tıp Fakültesi Kalp ve Damar Cerrahisi Anabilim Dalı, Kırıkkale, Türkiye
3 Hitit Üniversitesi Erol Olçok Eğitim ve Araştırma Hastanesi, Tıbbi Mikrobiyoloji Laboratuvarı, Çorum, Türkiye
* Corresponding Author
Ortadogu Tıp Derg, Volume 10, Issue 3, pp. 247-251
https://doi.org/10.21601/ortadogutipdergisi.353568
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Abstract
Aim: The number of patients applying to the emergency service with acute chest pain complaint are rather high, however most of them are not diagnosed with acute coronary syndrome (ACS). Firstly non-cardiac causes should be excluded to be able to determine true cardiac patients. Troponins are structural proteins of the cardiac muscle, also sensitive and specific molecules of cardiac damage. In this study, we aimed to determine cut off value of Creatine kinase MB (CKMB) test for ACS diagnosis by using cardiac troponin T (cTnT) results and ROC analysis. We also evaluated the combined use of cardiac markers and clinical finding in acute myocardial infarction (AMI) patient management.
Material and Method: Laboratory and clinical data, including electrocardiography (ECG) and cardiac markers (cTnT, CKMB levels) of 390 patients applying to emergency service with acute chest pain were retrospectively collected and attempted to develop a strategy using these data. The cases (age: 58.65±13.29) were divided into two groups: first group AMI and second group non-ischemic injury. CKMB levels were measured by the immunoinhibition method in Dimension Xpand Plus (Dade Behring Inc, Newark, USA) chemistry autoanalyzer. The Cardiac T Quantitative Rapid Assay (Roche Diagnostics GmbH, Mannheim, Germany) was used for cTnT measurement.
Result: In our study, AMI was detected in 36 of 390 patients (9.2%). In prediction of AMI, the diagnostic specificity and diagnostic sensitivity of CKMB was 92% and 44% for 16 U/L; 86% and 50% for 12 U/L; 79% and 61% for 9 U/L, 63% and 69% for 6 U/L, respectively. The area under the curve for CKMB was 0.72 (SE: 0.055, p <0.001).
Conclusion: Although cTnT is the most important marker in early diagnosis of AMI in emergency department, CKMB levels are a reliable marker that should be used together to reduce both false negative and false positives.
Öz
Amaç: Akut göğüs ağrısı şikâyeti ile acil servise başvuran hasta sayısı oldukça fazladır ancak bunların çoğu akut koroner sendrom (AKS) tanısı almaz. Gerçek kardiyak hastaları belirleyebilmek için ilk aşamada non-kardiyak nedenleri dışlamak gerekir. Troponinler, kalp kasının yapısal proteinleri olup kardiyak hasara duyarlı veözgün molekülleridir. Bu çalışmada AKS tanısı için Kreatin kinaz MB (CKMB) testinin kesme değerini kardiyak troponin T (cTnT) sonuçlarından ve ROC analizinden faydalanarak belirlemeyi amaçladık. Ayrıca akut miyokard infarktüsü (AMI) hasta yönetiminde kardiyak belirteçlerin ve klinik bilgilerin birlikte kullanımını değerlendirdik.
Gereç ve Yöntem: Akut göğüs ağrısı ileacil servise başvuran 390 hastanın elektrokardiyografi (EKG) ve kardiyak belirteçler (cTnT, CKMB seviyeleri) de dâhil olmak üzere laboratuvar ve klinik verileri retrospektif olarak toplandı ve bu veriler kullanılarak bir strateji geliştirmeye çalışıldı. Olgular (yaş:58.65 ± 13,29) iki gruba ayrıldı: birinci grup AMI ve ikinci grup iskemik hasar olmayanlardı. CKMB seviyeleri Dimension Xpand Plus (Dade Behring Inc, Newark, ABD) marka biyokimya otoanalizöründe immünoinhibisyon yöntemiyle ölçüldü. cTnT için Cardiac T Quantitative Rapid Assay (Roche Diagnostics GmbH, Mannheim, Almanya) hasta başı cihazı kullanıldı.
Bulgular: Çalışmamızda 390 hastanın 36'sında (% 9,2) AMI saptandı. AMI öngörmede CKMB'nin tanısal özgüllüğü ve tanısal duyarlılığı, 16 U/L düzeyi için %92 ve %44; 12 U/L düzeyi için %86 ve %50; 9 U/L düzeyi için %79 ve %61; 6 U/L düzeyi için%63 ve%69 olarak bulundu. CKMB için eğri altındaki alan 0,72 (SE:0,055, p<0,001) idi.
Sonuç: Acil serviste AMI erken teşhisinde her ne kadar cTnT en önemli marker olsa da CKMB düzeyleri de hem yalancı negatifliği hem de yalancı pozitifliği azaltmak için birlikte kullanılması gereken güvenilir bir markerdir.
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