Custom built rig supporting the right upper arm and forearm, enabling the arm to be splinted in the anatomical position (elbow extended and forearm supinated), the ultrasound (USS) probe positioned proximal to the elbow and the sphygmomanometer cuff positio... Custom built rig supporting the right upper arm and forearm, enabling the arm to be splinted in the anatomical position (elbow extended and forearm supinated), the ultrasound (USS) probe positioned proximal to the elbow and the sphygmomanometer cuff positioned distal to the elbow. David R Warriner et al. Open Heart 2016;3:e000391 ©2016 by British Cardiovascular Society