A new angiographic finding: primary peripheral slow flow

In some peripheral angiographies, similar to the coronary slow flow phenomenon (CSFP), we observed a peripheral slow flow (Supplementary Video 1). Although slow flow phenomenon after infrapopliteal balloon angioplasty is mentioned in 2 retrospective studies1, 2, primary peripheral slow flow has been previously reported in only 1 case report.3 Interestingly, it appears that similar to CSFP sometimes occurring in a single coronary artery, there is slow flow only in the left lower extremity artery in the video example (Supplementary Video 1). There is also no severe stenosis that would explain this phenomenon. Moreover, considering that peripheral angiography was performed with the right femoral artery puncture and that the catheter was within the right femoral artery, it could have been expected for the flow to be slower in the right lower extremity artery with the effect of spasm.