Pulmoner Emboli ile D-dimer Düzeyinin Korelasyonu ve Yaşa Göre Eşik Değerlerinin Belirlenmesi

Abstract

Aim: This study was conducted to determine the D-dimer threshold levels according to age in patients diagnosed with pulmonary embolism (PE) by pulmonary computed tomography (CT) angiography. Material and Methods: Patients who had pulmonary CT angiography performed and whose D-dimer test was obtained with the suspicion of pulmonary embolism (PE) in the emergency department of a tertiary university hospital between January 01, 2015, and December 30, 2019, were included in the study. The demographic characteristics of the patients, imaging reports, and 1-month mortality were evaluated retrospectively by examining the hospital information management system and patient files. Patients with missing records and patients who had diagnostic examinations other than the preliminary diagnosis of PE were excluded from the study. Results: Among the 6240 patients included in the study, 58.1% were female. The mean age of the patients was 43±17 years. Of the 1,507 patients who had a pulmonary CT angiogram, 9.8% were diagnosed with PE. When we looked at the 1-month mortality of 6240 patients, whose D-dimer assay was analyzed with the preliminary diagnosis of PE, we found that 0.3% of patients died. The monthly mortality rate was 0.7% in patients with high D-dimer levels while the mortality rate in patients with normal D-dimer levels was 0.1%. A positive and statistically significant correlation was found between the location of the pulmonary embolism in pulmonary CT angiography and the D-dimer level (spearman’s rho= 0.251, p<0.001). The cut-off D-dimer value in predicting the presence of PE in all age groups was calculated as 1.34 mg/L. The cut-off values of D-dimer to predict the presence of PE according to age ranges was calculated as 1.18 mg/L (<50 years), 1.19 mg/L (50-60 years), 1.58 mg/L (60-70 years) 1.79 mg/L (70-80 years), 2.83 mg/L (>80 years) respectively. Conclusion: As age increases, the D-dimer cut-off value for the diagnosis of PE also increases. There is a positive and significant relationship between D-dimer level and pulmonary embolism severity.