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Methods and results:1156 patients undergoing transradial coronary angiography were randomized into PO-FMD and sham PO-FMD groups. PO-FMD was achieved by a 10 minute inflation of a blood pressure cuff on the arm to above systolic pressure, followed by deflation with resultant radial artery dilation. In the sham PO-FMD group the cuff was not inflated. Operators were blinded to the intervention. 580 patients were randomized to the sham PO-FMD group and 576 to the PO-FMD group. Cannulation failure was reduced with PO-FMD with cannulation failure rates of 2.7% in the PO-FMD group and 5.8% in the sham PO-FMD group (p=0.01).The number of puncture attempts were reduced with the use of PO-FMD, with a median of 1 attempt in the PO-FMD group and 2 in the sham PO-FMD group (p<0.001). Radial artery pulsation loss (RAPL) was reduced with PO-FMD with 1.4% in the PO-FMD group and 3.8% in the sham PO-FMD group (p=0.02).
Conclusions: PO-FMD reduces cannulation failure rates, decreases puncture attempts, and decreases RAPL during transradial coronary angiography.
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