D-dimer for Ruling Out Aortic Dissection

Diagnostic Performance of D-dimer in Aortic Dissection

A D-dimer value below 500 ng/mL can effectively rule out acute aortic dissection with high sensitivity, making it a valuable initial screening tool in low-risk patients 1
Multiple studies demonstrate that D-dimer levels >0.5 μg/mL (500 ng/mL) have a sensitivity of 94-100% for acute aortic dissection 2, 1
The test is elevated in numerous other conditions including pulmonary embolism, myocardial infarction, and inflammatory states 1

Patients with intramural hematomas (a variant of aortic dissection) may have low or negative D-dimer levels 3
D-dimer levels are significantly lower in patients with thrombosed false lumens compared to those with patent false lumens 4
The first report demonstrating limitations in D-dimer sensitivity found that 8% of patients with acute aortic dissection had negative D-dimer results 2, 4
D-dimer has a relatively long half-life in circulation (approximately 16 hours), making it detectable even after the initial thrombotic event 1

The Aortic Dissection Detection Risk Score (ADD-RS) combined with D-dimer testing provides enhanced diagnostic accuracy 5
In patients with ADD-RS score of 0 and negative D-dimer, the likelihood ratio for aortic dissection was 0 in one study 6

Assess clinical risk using ADD-RS (high-risk predisposing conditions, pain features, examination features) 5
For low-risk patients (ADD-RS score 0), obtain D-dimer test 6
If D-dimer ≥500 ng/mL or ADD-RS score ≥1, proceed with advanced imaging (CT angiography, MRI, or transesophageal echocardiography) 1
Failing to recognize that intramural hematomas may present with negative D-dimer results 3
Not considering that different D-dimer assays may have varying sensitivities and specificities 1

The American College of Emergency Physicians recommends D-dimer testing for ruling out acute aortic syndrome, with a sensitivity of 91-100% in Asian populations, including Japanese and Chinese studies, using standard cutoffs 7
In Japanese patients, D-dimer >0.8 µg/mL had a sensitivity of 93.1% for diagnosing acute aortic dissection within 4 hours of symptom onset 7
The American Heart Association suggests that D-dimer >0.4 µg/mL achieved a sensitivity of 91.35% in 113 Japanese patients with CT-confirmed acute aortic dissection 7

The American College of Cardiology recommends calculating the ADD-RS score based on high-risk predisposing conditions, pain features, and examination findings to guide D-dimer testing and advanced imaging 8
For patients with ADD-RS ≥2, the American College of Cardiology suggests proceeding directly to CT angiography regardless of D-dimer results 8

The Chinese population may require a higher D-dimer threshold of 2000 ng/mL to optimize diagnostic accuracy, with a sensitivity of 92.5-93.1% and specificity of 70.2-70.3% 7, 9

The American College of Emergency Physicians notes that patients with thrombosed false lumens or intramural hematomas may exhibit lower D-dimer levels, requiring high clinical suspicion and alternative diagnostic approaches 7, 9
The 2022 ACC/AHA guidelines state that in patients with low aortic dissection risk score and D-dimer <500 ng/mL, the diagnosis of AAS is unlikely, but this represents a useful strategy to exclude diagnosis rather than an absolute rule-out 8