D-dimer can help differentiate suspected pulmonary embolism patients that require anti-coagulation

Area of Science:

• Emergency Medicine
• Hematology
• Diagnostic Imaging

Background:

• Pulmonary embolism (PE) diagnosis often relies on imaging, which may not always be available.
• D-dimer testing is a common biomarker for PE, but its utility in guiding treatment decisions without imaging needs further clarification.

Purpose of the Study:

• To determine if D-dimer concentration, without imaging, can differentiate patients with suspected PE who require anticoagulation from those who do not.
• To establish D-dimer cut-off values for stratifying patients based on risk of deterioration.

Main Methods:

• Retrospective analysis of 366 hemodynamically stable adult ED patients with suspected PE.
• Patients were categorized into groups based on the extent of PE and clinical risk.
• Receiver operating characteristic (ROC) curve analysis was used to determine optimal D-dimer cut-off values.

Main Results:

• An age-adjusted D-dimer cut-off of 1540 ng/mL demonstrated high accuracy (AUC 0.92) in differentiating patients requiring anticoagulation (specificity 86%, sensitivity 84%).
• A cut-off of 2500 ng/mL effectively identified high-risk patients (AUC 0.93) with 90% specificity and 83% sensitivity.
• These findings suggest D-dimer levels can effectively stratify PE risk.

Conclusions:

• Age-adjusted D-dimer cut-offs of 1540 ng/mL and 2500 ng/mL can reliably differentiate PE patients requiring anticoagulation and those at high risk of deterioration, respectively.
• These objective D-dimer thresholds can aid clinical decision-making in suspected PE cases, particularly when imaging is not feasible.
• This approach offers a valuable tool for managing suspected pulmonary embolism in resource-limited or time-sensitive settings.