SPECT Scans Offer Low-Risk Alternative for Pulmonary Embolism Diagnosis

New findings indicate that SPECT lung scans may provide a low-risk option for diagnosing pulmonary embolism (PE), a critical condition involving lung artery blood clots. While CTPA is the current standard, SPECT V/Q scanning is emerging as a viable alternative.

A multicenter trial comparing SPECT V/Q, CTPA, and traditional planar V/Q scans in 603 patients found similar PE diagnosis rates across methods. Crucially, for patients with negative test results and no treatment, the risk of venous thromboembolism within three months was consistently low across all imaging strategies: 0.5% for SPECT V/Q, 0% for CTPA, and 0.8% for planar V/Q.

These results suggest SPECT V/Q could be a safe choice, particularly for patients who cannot undergo CTPA due to contrast allergies or radiation concerns. However, the trial's early termination due to funding and recruitment limitations means further research is necessary before widespread guideline endorsement. The study highlights the potential of alternative imaging to enhance PE diagnosis and clinical flexibility.