Fig. 1From: Improving outcomes in single chamber leadless pacemakers: strategies for minimizing vascular complicationsThe use of ultrasound to differentiate between femoral arterial and venous circulation. A. Ultrasound image of right groin. Red structure represents femoral artery whereas blue structure represent femoral vein. B. Compression with ultrasound resulted into compressions of venous structure (blue) whereas arterial structure remained unchangedBack to article page